/* 

  * tclWinDde.c --

  *

  *	This file provides procedures that implement the "send"

  *	command, allowing commands to be passed from interpreter

  *	to interpreter.

  *

  * Copyright (c) 1997 by Sun Microsystems, Inc.

  *

  * See the file "license.terms" for information on usage and redistribution

  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

  *

  * RCS: @(#) $Id: tclWinDde.c,v 1.13.2.7 2006/04/05 20:50:46 dgp Exp $

  */

 #include "tclPort.h"

 #include <dde.h>

 #include <ddeml.h>

 #include <tchar.h>

 /*

  * TCL_STORAGE_CLASS is set unconditionally to DLLEXPORT because the

  * Registry_Init declaration is in the source file itself, which is only

  * accessed when we are building a library.

  */

 #undef TCL_STORAGE_CLASS

 #define TCL_STORAGE_CLASS DLLEXPORT

 /* 

  * The following structure is used to keep track of the interpreters

  * registered by this process.

  */

 typedef struct RegisteredInterp {

     struct RegisteredInterp *nextPtr;

 				/* The next interp this application knows

 				 * about. */

     char *name;			/* Interpreter's name (malloc-ed). */

     Tcl_Interp *interp;		/* The interpreter attached to this name. */

 } RegisteredInterp;

 /*

  * Used to keep track of conversations.

  */

 typedef struct Conversation {

     struct Conversation *nextPtr;

 				/* The next conversation in the list. */

     RegisteredInterp *riPtr;	/* The info we know about the conversation. */

     HCONV hConv;		/* The DDE handle for this conversation. */

     Tcl_Obj *returnPackagePtr;	/* The result package for this conversation. */

 } Conversation;

 typedef struct ThreadSpecificData {

     Conversation *currentConversations;

                                 /* A list of conversations currently

 				 * being processed. */

     RegisteredInterp *interpListPtr;

                                 /* List of all interpreters registered

 				 * in the current process. */

 } ThreadSpecificData;

 static Tcl_ThreadDataKey dataKey;

 /*

  * The following variables cannot be placed in thread-local storage.

  * The Mutex ddeMutex guards access to the ddeInstance.

  */

 static HSZ ddeServiceGlobal = 0;

 static DWORD ddeInstance;       /* The application instance handle given

 				 * to us by DdeInitialize. */

 static int ddeIsServer = 0;

 #define TCL_DDE_VERSION "1.2.4"

 #define TCL_DDE_PACKAGE_NAME "dde"

 #define TCL_DDE_SERVICE_NAME "TclEval"

 TCL_DECLARE_MUTEX(ddeMutex)

 /*

  * Forward declarations for procedures defined later in this file.

  */

 static void		    DdeExitProc _ANSI_ARGS_((ClientData clientData));

 static void		    DeleteProc _ANSI_ARGS_((ClientData clientData));

 static Tcl_Obj *	    ExecuteRemoteObject _ANSI_ARGS_((

 				RegisteredInterp *riPtr, 

 				Tcl_Obj *ddeObjectPtr));

 static int		    MakeDdeConnection _ANSI_ARGS_((Tcl_Interp *interp,

 				char *name, HCONV *ddeConvPtr));

 static HDDEDATA CALLBACK    DdeServerProc _ANSI_ARGS_((UINT uType,

 				UINT uFmt, HCONV hConv, HSZ ddeTopic,

 				HSZ ddeItem, HDDEDATA hData, DWORD dwData1, 

 				DWORD dwData2));

 static void		    SetDdeError _ANSI_ARGS_((Tcl_Interp *interp));

 static int                  DdeGetServicesList _ANSI_ARGS_((

 				Tcl_Interp *interp,

 				char *serviceName,

 				char *topicName));

 int Tcl_DdeObjCmd(ClientData clientData,	/* Used only for deletion */

 	Tcl_Interp *interp,		/* The interp we are sending from */

 	int objc,			/* Number of arguments */

 	Tcl_Obj *CONST objv[]);	/* The arguments */

 EXTERN int Dde_Init(Tcl_Interp *interp);

 /*

  *----------------------------------------------------------------------

  *

  * Dde_Init --

  *

  *	This procedure initializes the dde command.

  *

  * Results:

  *	A standard Tcl result.

  *

  * Side effects:

  *	None.

  *

  *----------------------------------------------------------------------

  */

 int

 Dde_Init(

     Tcl_Interp *interp)

 {

     ThreadSpecificData *tsdPtr;

     if (!Tcl_InitStubs(interp, "8.0", 0)) {

 	return TCL_ERROR;

     }

     Tcl_CreateObjCommand(interp, "dde", Tcl_DdeObjCmd, NULL, NULL);

     tsdPtr = TCL_TSD_INIT(&dataKey);

     Tcl_CreateExitHandler(DdeExitProc, NULL);

     return Tcl_PkgProvide(interp, TCL_DDE_PACKAGE_NAME, TCL_DDE_VERSION);

 }

 /*

  *----------------------------------------------------------------------

  *

  * Initialize --

  *

  *	Initialize the global DDE instance.

  *

  * Results:

  *	None.

  *

  * Side effects:

  *	Registers the DDE server proc.

  *

  *----------------------------------------------------------------------

  */

 static void

 Initialize(void)

 {

     int nameFound = 0;

     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

     /*

      * See if the application is already registered; if so, remove its

      * current name from the registry. The deletion of the command

      * will take care of disposing of this entry.

      */

     if (tsdPtr->interpListPtr != NULL) {

 	nameFound = 1;

     }

     /*

      * Make sure that the DDE server is there. This is done only once,

      * add an exit handler tear it down.

      */

     if (ddeInstance == 0) {

 	Tcl_MutexLock(&ddeMutex);

 	if (ddeInstance == 0) {

 	    if (DdeInitialize(&ddeInstance, DdeServerProc,

 		    CBF_SKIP_REGISTRATIONS

 		    | CBF_SKIP_UNREGISTRATIONS

 		    | CBF_FAIL_POKES, 0) 

 		    != DMLERR_NO_ERROR) {

 		ddeInstance = 0;

 	    }

 	}

 	Tcl_MutexUnlock(&ddeMutex);

     }

     if ((ddeServiceGlobal == 0) && (nameFound != 0)) {

 	Tcl_MutexLock(&ddeMutex);

 	if ((ddeServiceGlobal == 0) && (nameFound != 0)) {

 	    ddeIsServer = 1;

 	    Tcl_CreateExitHandler(DdeExitProc, NULL);

 	    ddeServiceGlobal = DdeCreateStringHandle(ddeInstance, \

 		    TCL_DDE_SERVICE_NAME, 0);

 	    DdeNameService(ddeInstance, ddeServiceGlobal, 0L, DNS_REGISTER);

 	} else {

 	    ddeIsServer = 0;

 	}

 	Tcl_MutexUnlock(&ddeMutex);

     }

 }    

 /*

  *--------------------------------------------------------------

  *

  * DdeSetServerName --

  *

  *	This procedure is called to associate an ASCII name with a Dde

  *	server.  If the interpreter has already been named, the

  *	name replaces the old one.

  *

  * Results:

  *	The return value is the name actually given to the interp.

  *	This will normally be the same as name, but if name was already

  *	in use for a Dde Server then a name of the form "name #2" will

  *	be chosen,  with a high enough number to make the name unique.

  *

  * Side effects:

  *	Registration info is saved, thereby allowing the "send" command

  *	to be used later to invoke commands in the application.  In

  *	addition, the "send" command is created in the application's

  *	interpreter.  The registration will be removed automatically

  *	if the interpreter is deleted or the "send" command is removed.

  *

  *--------------------------------------------------------------

  */

 static char *

 DdeSetServerName(

     Tcl_Interp *interp,

     char *name			/* The name that will be used to

 				 * refer to the interpreter in later

 				 * "send" commands.  Must be globally

 				 * unique. */

     )

 {

     int suffix, offset;

     RegisteredInterp *riPtr, *prevPtr;

     Tcl_DString dString;

     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

     /*

      * See if the application is already registered; if so, remove its

      * current name from the registry. The deletion of the command

      * will take care of disposing of this entry.

      */

     for (riPtr = tsdPtr->interpListPtr, prevPtr = NULL; riPtr != NULL; 

 	    prevPtr = riPtr, riPtr = riPtr->nextPtr) {

 	if (riPtr->interp == interp) {

 	    if (name != NULL) {

 		if (prevPtr == NULL) {

 		    tsdPtr->interpListPtr = tsdPtr->interpListPtr->nextPtr;

 		} else {

 		    prevPtr->nextPtr = riPtr->nextPtr;

 		}

 		break;

 	    } else {

 		/*

 		 * the name was NULL, so the caller is asking for

 		 * the name of the current interp.

 		 */

 		return riPtr->name;

 	    }

 	}

     }

     if (name == NULL) {

 	/*

 	 * the name was NULL, so the caller is asking for

 	 * the name of the current interp, but it doesn't

 	 * have a name.

 	 */

 	return "";

     }

     /*

      * Pick a name to use for the application.  Use "name" if it's not

      * already in use.  Otherwise add a suffix such as " #2", trying

      * larger and larger numbers until we eventually find one that is

      * unique.

      */

     suffix = 1;

     offset = 0;

     Tcl_DStringInit(&dString);

     /*

      * We have found a unique name. Now add it to the registry.

      */

     riPtr = (RegisteredInterp *) ckalloc(sizeof(RegisteredInterp));

     riPtr->interp = interp;

     riPtr->name = ckalloc((unsigned int) strlen(name) + 1);

     riPtr->nextPtr = tsdPtr->interpListPtr;

     tsdPtr->interpListPtr = riPtr;

     strcpy(riPtr->name, name);

     Tcl_CreateObjCommand(interp, "dde", Tcl_DdeObjCmd,

 	    (ClientData) riPtr, DeleteProc);

     if (Tcl_IsSafe(interp)) {

 	Tcl_HideCommand(interp, "dde", "dde");

     }

     Tcl_DStringFree(&dString);

     /*

      * re-initialize with the new name

      */

     Initialize();

     return riPtr->name;

 }

 /*

  *--------------------------------------------------------------

  *

  * DeleteProc

  *

  *	This procedure is called when the command "dde" is destroyed.

  *

  * Results:

  *	none

  *

  * Side effects:

  *	The interpreter given by riPtr is unregistered.

  *

  *--------------------------------------------------------------

  */

 static void

 DeleteProc(clientData)

     ClientData clientData;	/* The interp we are deleting passed

 				 * as ClientData. */

 {

     RegisteredInterp *riPtr = (RegisteredInterp *) clientData;

     RegisteredInterp *searchPtr, *prevPtr;

     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

     for (searchPtr = tsdPtr->interpListPtr, prevPtr = NULL;

 	    (searchPtr != NULL) && (searchPtr != riPtr);

 	    prevPtr = searchPtr, searchPtr = searchPtr->nextPtr) {

 	/*

 	 * Empty loop body.

 	 */

     }

     if (searchPtr != NULL) {

 	if (prevPtr == NULL) {

 	    tsdPtr->interpListPtr = tsdPtr->interpListPtr->nextPtr;

 	} else {

 	    prevPtr->nextPtr = searchPtr->nextPtr;

 	}

     }

     ckfree(riPtr->name);

     Tcl_EventuallyFree(clientData, TCL_DYNAMIC);

 }

 /*

  *--------------------------------------------------------------

  *

  * ExecuteRemoteObject --

  *

  *	Takes the package delivered by DDE and executes it in

  *	the server's interpreter.

  *

  * Results:

  *	A list Tcl_Obj * that describes what happened. The first

  *	element is the numerical return code (TCL_ERROR, etc.).

  *	The second element is the result of the script. If the

  *	return result was TCL_ERROR, then the third element

  *	will be the value of the global "errorCode", and the

  *	fourth will be the value of the global "errorInfo".

  *	The return result will have a refCount of 0.

  *

  * Side effects:

  *	A Tcl script is run, which can cause all kinds of other

  *	things to happen.

  *

  *--------------------------------------------------------------

  */

 static Tcl_Obj *

 ExecuteRemoteObject(

     RegisteredInterp *riPtr,	    /* Info about this server. */

     Tcl_Obj *ddeObjectPtr)	    /* The object to execute. */

 {

     Tcl_Obj *errorObjPtr;

     Tcl_Obj *returnPackagePtr;

     int result;

     result = Tcl_EvalObjEx(riPtr->interp, ddeObjectPtr, TCL_EVAL_GLOBAL);

     returnPackagePtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL);

     Tcl_ListObjAppendElement(NULL, returnPackagePtr,

 	    Tcl_NewIntObj(result));

     Tcl_ListObjAppendElement(NULL, returnPackagePtr,

 	    Tcl_GetObjResult(riPtr->interp));

     if (result == TCL_ERROR) {

 	errorObjPtr = Tcl_GetVar2Ex(riPtr->interp, "errorCode", NULL,

 		TCL_GLOBAL_ONLY);

 	Tcl_ListObjAppendElement(NULL, returnPackagePtr, errorObjPtr);

 	errorObjPtr = Tcl_GetVar2Ex(riPtr->interp, "errorInfo", NULL,

 		TCL_GLOBAL_ONLY);

         Tcl_ListObjAppendElement(NULL, returnPackagePtr, errorObjPtr);

     }

     return returnPackagePtr;

 }

 /*

  *--------------------------------------------------------------

  *

  * DdeServerProc --

  *

  *	Handles all transactions for this server. Can handle

  *	execute, request, and connect protocols. Dde will

  *	call this routine when a client attempts to run a dde

  *	command using this server.

  *

  * Results:

  *	A DDE Handle with the result of the dde command.

  *

  * Side effects:

  *	Depending on which command is executed, arbitrary

  *	Tcl scripts can be run.

  *

  *--------------------------------------------------------------

  */

 static HDDEDATA CALLBACK

 DdeServerProc (

     UINT uType,			/* The type of DDE transaction we

 				 * are performing. */

     UINT uFmt,			/* The format that data is sent or

 				 * received. */

     HCONV hConv,		/* The conversation associated with the 

 				 * current transaction. */

     HSZ ddeTopic,		/* A string handle. Transaction-type 

 				 * dependent. */

     HSZ ddeItem,		/* A string handle. Transaction-type 

 				 * dependent. */

     HDDEDATA hData,		/* DDE data. Transaction-type dependent. */

     DWORD dwData1,		/* Transaction-dependent data. */

     DWORD dwData2)		/* Transaction-dependent data. */

 {

     Tcl_DString dString;

     int len;

     DWORD dlen;

     char *utilString;

     Tcl_Obj *ddeObjectPtr;

     HDDEDATA ddeReturn = NULL;

     RegisteredInterp *riPtr;

     Conversation *convPtr, *prevConvPtr;

     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

     switch(uType) {

 	case XTYP_CONNECT:

 	    /*

 	     * Dde is trying to initialize a conversation with us. Check

 	     * and make sure we have a valid topic.

 	     */

 	    len = DdeQueryString(ddeInstance, ddeTopic, NULL, 0, 0);

 	    Tcl_DStringInit(&dString);

 	    Tcl_DStringSetLength(&dString, len);

 	    utilString = Tcl_DStringValue(&dString);

 	    DdeQueryString(ddeInstance, ddeTopic, utilString, (DWORD) len + 1,

 		    CP_WINANSI);

 	    for (riPtr = tsdPtr->interpListPtr; riPtr != NULL;

 		    riPtr = riPtr->nextPtr) {

 		if (stricmp(utilString, riPtr->name) == 0) {

 		    Tcl_DStringFree(&dString);

 		    return (HDDEDATA) TRUE;

 		}

 	    }

 	    Tcl_DStringFree(&dString);

 	    return (HDDEDATA) FALSE;

 	case XTYP_CONNECT_CONFIRM:

 	    /*

 	     * Dde has decided that we can connect, so it gives us a 

 	     * conversation handle. We need to keep track of it

 	     * so we know which execution result to return in an

 	     * XTYP_REQUEST.

 	     */

 	    len = DdeQueryString(ddeInstance, ddeTopic, NULL, 0, 0);

 	    Tcl_DStringInit(&dString);

 	    Tcl_DStringSetLength(&dString, len);

 	    utilString = Tcl_DStringValue(&dString);

 	    DdeQueryString(ddeInstance, ddeTopic, utilString, (DWORD) len + 1, 

 		    CP_WINANSI);

 	    for (riPtr = tsdPtr->interpListPtr; riPtr != NULL; 

 		    riPtr = riPtr->nextPtr) {

 		if (stricmp(riPtr->name, utilString) == 0) {

 		    convPtr = (Conversation *) ckalloc(sizeof(Conversation));

 		    convPtr->nextPtr = tsdPtr->currentConversations;

 		    convPtr->returnPackagePtr = NULL;

 		    convPtr->hConv = hConv;

 		    convPtr->riPtr = riPtr;

 		    tsdPtr->currentConversations = convPtr;

 		    break;

 		}

 	    }

 	    Tcl_DStringFree(&dString);

 	    return (HDDEDATA) TRUE;

 	case XTYP_DISCONNECT:

 	    /*

 	     * The client has disconnected from our server. Forget this

 	     * conversation.

 	     */

 	    for (convPtr = tsdPtr->currentConversations, prevConvPtr = NULL;

 		    convPtr != NULL; 

 		    prevConvPtr = convPtr, convPtr = convPtr->nextPtr) {

 		if (hConv == convPtr->hConv) {

 		    if (prevConvPtr == NULL) {

 			tsdPtr->currentConversations = convPtr->nextPtr;

 		    } else {

 			prevConvPtr->nextPtr = convPtr->nextPtr;

 		    }

 		    if (convPtr->returnPackagePtr != NULL) {

 			Tcl_DecrRefCount(convPtr->returnPackagePtr);

 		    }

 		    ckfree((char *) convPtr);

 		    break;

 		}

 	    }

 	    return (HDDEDATA) TRUE;

 	case XTYP_REQUEST:

 	    /*

 	     * This could be either a request for a value of a Tcl variable,

 	     * or it could be the send command requesting the results of the

 	     * last execute.

 	     */

 	    if (uFmt != CF_TEXT) {

 		return (HDDEDATA) FALSE;

 	    }

 	    ddeReturn = (HDDEDATA) FALSE;

 	    for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)

 		    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {

 		/*

 		 * Empty loop body.

 		 */

 	    }

 	    if (convPtr != NULL) {

 		char *returnString;

 		len = DdeQueryString(ddeInstance, ddeItem, NULL, 0,

 			CP_WINANSI);

 		Tcl_DStringInit(&dString);

 		Tcl_DStringSetLength(&dString, len);

 		utilString = Tcl_DStringValue(&dString);

 		DdeQueryString(ddeInstance, ddeItem, utilString, 

                         (DWORD) len + 1, CP_WINANSI);

 		if (stricmp(utilString, "$TCLEVAL$EXECUTE$RESULT") == 0) {

 		    returnString =

 		        Tcl_GetStringFromObj(convPtr->returnPackagePtr, &len);

 		    ddeReturn = DdeCreateDataHandle(ddeInstance,

 			    returnString, (DWORD) len+1, 0, ddeItem, CF_TEXT,

 			    0);

 		} else {

 		    Tcl_Obj *variableObjPtr = Tcl_GetVar2Ex(

 			    convPtr->riPtr->interp, utilString, NULL, 

 			    TCL_GLOBAL_ONLY);

 		    if (variableObjPtr != NULL) {

 			returnString = Tcl_GetStringFromObj(variableObjPtr,

 				&len);

 			ddeReturn = DdeCreateDataHandle(ddeInstance,

 				returnString, (DWORD) len+1, 0, ddeItem,

 				CF_TEXT, 0);

 		    } else {

 			ddeReturn = NULL;

 		    }

 		}

 		Tcl_DStringFree(&dString);

 	    }

 	    return ddeReturn;

 	case XTYP_EXECUTE: {

 	    /*

 	     * Execute this script. The results will be saved into

 	     * a list object which will be retreived later. See

 	     * ExecuteRemoteObject.

 	     */

 	    Tcl_Obj *returnPackagePtr;

 	    for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)

 		    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {

 		/*

 		 * Empty loop body.

 		 */

 	    }

 	    if (convPtr == NULL) {

 		return (HDDEDATA) DDE_FNOTPROCESSED;

 	    }

 	    utilString = (char *) DdeAccessData(hData, &dlen);

 	    len = dlen;

 	    ddeObjectPtr = Tcl_NewStringObj(utilString, -1);

 	    Tcl_IncrRefCount(ddeObjectPtr);

 	    DdeUnaccessData(hData);

 	    if (convPtr->returnPackagePtr != NULL) {

 		Tcl_DecrRefCount(convPtr->returnPackagePtr);

 	    }

 	    convPtr->returnPackagePtr = NULL;

 	    returnPackagePtr = 

 		    ExecuteRemoteObject(convPtr->riPtr, ddeObjectPtr);

 	    Tcl_IncrRefCount(returnPackagePtr);

 	    for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)

  		    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {

 		/*

 		 * Empty loop body.

 		 */

 	    }

 	    if (convPtr != NULL) {

 		convPtr->returnPackagePtr = returnPackagePtr;

 	    } else {

 		Tcl_DecrRefCount(returnPackagePtr);

 	    }

 	    Tcl_DecrRefCount(ddeObjectPtr);

 	    if (returnPackagePtr == NULL) {

 		return (HDDEDATA) DDE_FNOTPROCESSED;

 	    } else {

 		return (HDDEDATA) DDE_FACK;

 	    }

 	}

 	case XTYP_WILDCONNECT: {

 	    /*

 	     * Dde wants a list of services and topics that we support.

 	     */

 	    HSZPAIR *returnPtr;

 	    int i;

 	    int numItems;

 	    for (i = 0, riPtr = tsdPtr->interpListPtr; riPtr != NULL;

 		    i++, riPtr = riPtr->nextPtr) {

 		/*

 		 * Empty loop body.

 		 */

 	    }

 	    numItems = i;

 	    ddeReturn = DdeCreateDataHandle(ddeInstance, NULL,

 		    (numItems + 1) * sizeof(HSZPAIR), 0, 0, 0, 0);

 	    returnPtr = (HSZPAIR *) DdeAccessData(ddeReturn, &dlen);

 	    len = dlen;

 	    for (i = 0, riPtr = tsdPtr->interpListPtr; i < numItems; 

 		    i++, riPtr = riPtr->nextPtr) {

 		returnPtr[i].hszSvc = DdeCreateStringHandle(

                         ddeInstance, "TclEval", CP_WINANSI);

 		returnPtr[i].hszTopic = DdeCreateStringHandle(

                         ddeInstance, riPtr->name, CP_WINANSI);

 	    }

 	    returnPtr[i].hszSvc = NULL;

 	    returnPtr[i].hszTopic = NULL;

 	    DdeUnaccessData(ddeReturn);

 	    return ddeReturn;

 	}

     }

     return NULL;

 }

 /*

  *--------------------------------------------------------------

  *

  * DdeExitProc --

  *

  *	Gets rid of our DDE server when we go away.

  *

  * Results:

  *	None.

  *

  * Side effects:

  *	The DDE server is deleted.

  *

  *--------------------------------------------------------------

  */

 static void

 DdeExitProc(

     ClientData clientData)	    /* Not used in this handler. */

 {

     DdeNameService(ddeInstance, NULL, 0, DNS_UNREGISTER);

     DdeUninitialize(ddeInstance);

     ddeInstance = 0;

 }

 /*

  *--------------------------------------------------------------

  *

  * MakeDdeConnection --

  *

  *	This procedure is a utility used to connect to a DDE

  *	server when given a server name and a topic name.

  *

  * Results:

  *	A standard Tcl result.

  *	

  *

  * Side effects:

  *	Passes back a conversation through ddeConvPtr

  *

  *--------------------------------------------------------------

  */

 static int

 MakeDdeConnection(

     Tcl_Interp *interp,		/* Used to report errors. */

     char *name,			/* The connection to use. */

     HCONV *ddeConvPtr)

 {

     HSZ ddeTopic, ddeService;

     HCONV ddeConv;

     ddeService = DdeCreateStringHandle(ddeInstance, "TclEval", 0);

     ddeTopic = DdeCreateStringHandle(ddeInstance, name, 0);

     ddeConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);

     DdeFreeStringHandle(ddeInstance, ddeService);

     DdeFreeStringHandle(ddeInstance, ddeTopic);

     if (ddeConv == (HCONV) NULL) {

 	if (interp != NULL) {

 	    Tcl_AppendResult(interp, "no registered server named \"",

 		    name, "\"", (char *) NULL);

 	}

 	return TCL_ERROR;

     }

     *ddeConvPtr = ddeConv;

     return TCL_OK;

 }

 /*

  *--------------------------------------------------------------

  *

  * DdeGetServicesList --

  *

  *	This procedure obtains the list of DDE services.

  *

  *	The functions between here and this procedure are all

  *	involved with handling the DDE callbacks for this.

  *

  * Results:

  *	A standard Tcl result.

  *

  * Side effects:

  *	Sets the services list into the interp result.

  *

  *--------------------------------------------------------------

  */

 typedef struct ddeEnumServices {

     Tcl_Interp *interp;

     int         result;

     ATOM        service;

     ATOM        topic;

     HWND        hwnd;

 } ddeEnumServices;

 LRESULT CALLBACK

 DdeClientWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

 static LRESULT

 DdeServicesOnAck(HWND hwnd, WPARAM wParam, LPARAM lParam);

 static int

 DdeCreateClient(ddeEnumServices *es)

 {

     WNDCLASSEX wc;

     static const char *szDdeClientClassName = "TclEval client class";

     static const char *szDdeClientWindowName = "TclEval client window";

     memset(&wc, 0, sizeof(wc));

     wc.cbSize = sizeof(wc);

     wc.lpfnWndProc = DdeClientWindowProc;

     wc.lpszClassName = szDdeClientClassName;

     wc.cbWndExtra = sizeof(ddeEnumServices*);

     /* register and create the callback window */

     RegisterClassEx(&wc);

     es->hwnd = CreateWindowEx(0, szDdeClientClassName,

 			      szDdeClientWindowName,

 			      WS_POPUP, 0, 0, 0, 0, NULL, NULL, NULL,

 			      (LPVOID)es);

     return TCL_OK;

 }

 LRESULT CALLBACK

 DdeClientWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

 {

     LRESULT lr = 0L;

     switch (uMsg) {

 	case WM_CREATE: {

 	    LPCREATESTRUCT lpcs = (LPCREATESTRUCT)lParam;

 	    ddeEnumServices *es;

 	    es = (ddeEnumServices*)lpcs->lpCreateParams;

 #ifdef _WIN64

 	    SetWindowLongPtr(hwnd, GWLP_USERDATA, (long)es);

 #else

 	    SetWindowLong(hwnd, GWL_USERDATA, (long)es);

 #endif

 	    break;

 	}

 	case WM_DDE_ACK:

 	    lr =  DdeServicesOnAck(hwnd, wParam, lParam);

 	    break;

 	default:

 	    lr = DefWindowProc(hwnd, uMsg, wParam, lParam);

     }

     return lr;

 }

 static LRESULT

 DdeServicesOnAck(HWND hwnd, WPARAM wParam, LPARAM lParam)

 {

     HWND hwndRemote = (HWND)wParam;

     ATOM service = (ATOM)LOWORD(lParam);

     ATOM topic = (ATOM)HIWORD(lParam);

     ddeEnumServices *es;

     TCHAR sz[255];

 #ifdef _WIN64

     es = (ddeEnumServices *)GetWindowLongPtr(hwnd, GWLP_USERDATA);

 #else

     es = (ddeEnumServices *)GetWindowLong(hwnd, GWL_USERDATA);

 #endif

     if ((es->service == (ATOM)NULL || es->service == service)

 	&& (es->topic == (ATOM)NULL || es->topic == topic)) {

 	Tcl_Obj *matchPtr = Tcl_NewListObj(0, NULL);

 	GlobalGetAtomName(service, sz, 255);

 	Tcl_ListObjAppendElement(es->interp, matchPtr,

 		Tcl_NewStringObj(sz, -1));

 	GlobalGetAtomName(topic, sz, 255);

 	Tcl_ListObjAppendElement(es->interp, matchPtr,

 		Tcl_NewStringObj(sz, -1));

 	/* Adding the hwnd as a third list element provides a unique

 	 * identifier in the case of multiple servers with the name

 	 * application and topic names.

 	 */

 	/* Needs a TIP though

 	 * Tcl_ListObjAppendElement(es->interp, matchPtr,

 	 *	Tcl_NewLongObj((long)hwndRemote));

 	 */

 	Tcl_ListObjAppendElement(es->interp,

 		Tcl_GetObjResult(es->interp), matchPtr);

     }

     /* tell the server we are no longer interested */

     PostMessage(hwndRemote, WM_DDE_TERMINATE, (WPARAM)hwnd, 0L);

     return 0L;

 }

 static BOOL CALLBACK

 DdeEnumWindowsCallback(HWND hwndTarget, LPARAM lParam)

 {

     LRESULT dwResult = 0;

     ddeEnumServices *es = (ddeEnumServices *)lParam;

     SendMessageTimeout(hwndTarget, WM_DDE_INITIATE,

 		       (WPARAM)es->hwnd,

 		       MAKELONG(es->service, es->topic),

 		       SMTO_ABORTIFHUNG, 1000, &dwResult);

     return TRUE;

 }

 static int

 DdeGetServicesList(Tcl_Interp *interp, char *serviceName, char *topicName)

 {

     ddeEnumServices es;

     int r = TCL_OK;

     es.interp = interp;

     es.result = TCL_OK;

     es.service = (serviceName == NULL) 

 	? (ATOM)NULL : GlobalAddAtom(serviceName);

     es.topic = (topicName == NULL) 

 	? (ATOM)NULL : GlobalAddAtom(topicName);

     Tcl_ResetResult(interp); /* our list is to be appended to result. */

     DdeCreateClient(&es);

     EnumWindows(DdeEnumWindowsCallback, (LPARAM)&es);

     if (IsWindow(es.hwnd))

         DestroyWindow(es.hwnd);

     if (es.service != (ATOM)NULL)

 	GlobalDeleteAtom(es.service);

     if (es.topic != (ATOM)NULL)

 	GlobalDeleteAtom(es.topic);

     return es.result;

 }

 /*

  *--------------------------------------------------------------

  *

  * SetDdeError --

  *

  *	Sets the interp result to a cogent error message

  *	describing the last DDE error.

  *

  * Results:

  *	None.

  *	

  *

  * Side effects:

  *	The interp's result object is changed.

  *

  *--------------------------------------------------------------

  */

 static void

 SetDdeError(

     Tcl_Interp *interp)	    /* The interp to put the message in.*/

 {

     Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);

     int err;

     err = DdeGetLastError(ddeInstance);

     switch (err) {

 	case DMLERR_DATAACKTIMEOUT:

 	case DMLERR_EXECACKTIMEOUT:

 	case DMLERR_POKEACKTIMEOUT:

 	    Tcl_SetStringObj(resultPtr,

 		    "remote interpreter did not respond", -1);

 	    break;

 	case DMLERR_BUSY:

 	    Tcl_SetStringObj(resultPtr, "remote server is busy", -1);

 	    break;

 	case DMLERR_NOTPROCESSED:

 	    Tcl_SetStringObj(resultPtr, 

 		    "remote server cannot handle this command", -1);

 	    break;

 	default:

 	    Tcl_SetStringObj(resultPtr, "dde command failed", -1);

     }

 }

 /*

  *--------------------------------------------------------------

  *

  * Tcl_DdeObjCmd --

  *

  *	This procedure is invoked to process the "dde" Tcl command.

  *	See the user documentation for details on what it does.

  *

  * Results:

  *	A standard Tcl result.

  *

  * Side effects:

  *	See the user documentation.

  *

  *--------------------------------------------------------------

  */

 int

 Tcl_DdeObjCmd(

     ClientData clientData,	/* Used only for deletion */

     Tcl_Interp *interp,		/* The interp we are sending from */

     int objc,			/* Number of arguments */

     Tcl_Obj *CONST objv[])	/* The arguments */

 {

     enum {

 	DDE_SERVERNAME,

 	DDE_EXECUTE,

 	DDE_POKE,

 	DDE_REQUEST,

 	DDE_SERVICES,

 	DDE_EVAL

     };

     static CONST char *ddeCommands[] = {"servername", "execute", "poke",

           "request", "services", "eval", 

 	  (char *) NULL};

     static CONST char *ddeOptions[] = {"-async", (char *) NULL};

     static CONST char *ddeReqOptions[] = {"-binary", (char *) NULL};

     int index, argIndex;

     int async = 0, binary = 0;

     int result = TCL_OK;

     HSZ ddeService = NULL;

     HSZ ddeTopic = NULL;

     HSZ ddeItem = NULL;

     HDDEDATA ddeData = NULL;

     HDDEDATA ddeItemData = NULL;

     HCONV hConv = NULL;

     HSZ ddeCookie = 0;

     char *serviceName, *topicName, *itemString, *dataString;

     char *string;

     int firstArg, length, dataLength;

     DWORD ddeResult;

     HDDEDATA ddeReturn;

     RegisteredInterp *riPtr;

     Tcl_Interp *sendInterp;

     Tcl_Obj *objPtr;

     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

     /*

      * Initialize DDE server/client

      */

     if (objc < 2) {

 	Tcl_WrongNumArgs(interp, 1, objv, 

 		"?-async? serviceName topicName value");

 	return TCL_ERROR;

     }

     if (Tcl_GetIndexFromObj(interp, objv[1], ddeCommands, "command", 0,

 	    &index) != TCL_OK) {

 	return TCL_ERROR;

     }

     switch (index) {

 	case DDE_SERVERNAME:

 	    if ((objc != 3) && (objc != 2)) {

 		Tcl_WrongNumArgs(interp, 1, objv, "servername ?serverName?");

 		return TCL_ERROR;

 	    }

 	    firstArg = (objc - 1);

 	    break;

 	case DDE_EXECUTE:

 	    if ((objc < 5) || (objc > 6)) {

 		Tcl_WrongNumArgs(interp, 1, objv, 

 			"execute ?-async? serviceName topicName value");

 		return TCL_ERROR;

 	    }

 	    if (Tcl_GetIndexFromObj(NULL, objv[2], ddeOptions, "option", 0,

 		    &argIndex) != TCL_OK) {

 		if (objc != 5) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "execute ?-async? serviceName topicName value");

 		    return TCL_ERROR;

 		}

 		async = 0;

 		firstArg = 2;

 	    } else {

 		if (objc != 6) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "execute ?-async? serviceName topicName value");

 		    return TCL_ERROR;

 		}

 		async = 1;

 		firstArg = 3;

 	    }

 	    break;

  	case DDE_POKE:

 	    if (objc != 6) {

 		Tcl_WrongNumArgs(interp, 1, objv,

 			"poke serviceName topicName item value");

 		return TCL_ERROR;

 	    }

 	    firstArg = 2;

 	    break;

 	case DDE_REQUEST:

 	    if ((objc < 5) || (objc > 6)) {

 		Tcl_WrongNumArgs(interp, 1, objv, 

 			"request ?-binary? serviceName topicName value");

 		return TCL_ERROR;

 	    }

 	    if (Tcl_GetIndexFromObj(NULL, objv[2], ddeReqOptions, "option", 0,

 		    &argIndex) != TCL_OK) {

 		if (objc != 5) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "request ?-binary? serviceName topicName value");

 		    return TCL_ERROR;

 		}

 		binary = 0;

 		firstArg = 2;

 	    } else {

 		if (objc != 6) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "request ?-binary? serviceName topicName value");

 		    return TCL_ERROR;

 		}

 		binary = 1;

 		firstArg = 3;

 	    }

 	    break;

 	case DDE_SERVICES:

 	    if (objc != 4) {

 		Tcl_WrongNumArgs(interp, 1, objv,

 			"services serviceName topicName");

 		return TCL_ERROR;

 	    }

 	    firstArg = 2;

 	    break;

 	case DDE_EVAL:

 	    if (objc < 4) {

 		Tcl_WrongNumArgs(interp, 1, objv, 

 			"eval ?-async? serviceName args");

 		return TCL_ERROR;

 	    }

 	    if (Tcl_GetIndexFromObj(NULL, objv[2], ddeOptions, "option", 0,

 		    &argIndex) != TCL_OK) {

 		if (objc < 4) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "eval ?-async? serviceName args");

 		    return TCL_ERROR;

 		}

 		async = 0;

 		firstArg = 2;

 	    } else {

 		if (objc < 5) {

 		    Tcl_WrongNumArgs(interp, 1, objv,

 			    "eval ?-async? serviceName args");

 		    return TCL_ERROR;

 		}

 		async = 1;

 		firstArg = 3;

 	    }

 	    break;

     }

     Initialize();

     if (firstArg != 1) {

 	serviceName = Tcl_GetStringFromObj(objv[firstArg], &length);

     } else {

 	length = 0;

     }

     if (length == 0) {

 	serviceName = NULL;

     } else if ((index != DDE_SERVERNAME) && (index != DDE_EVAL)) {

 	ddeService = DdeCreateStringHandle(ddeInstance, serviceName,

 		CP_WINANSI);

     }

     if ((index != DDE_SERVERNAME) &&(index != DDE_EVAL)) {

 	topicName = Tcl_GetStringFromObj(objv[firstArg + 1], &length);

 	if (length == 0) {

 	    topicName = NULL;

 	} else {

 	    ddeTopic = DdeCreateStringHandle(ddeInstance, 

 		    topicName, CP_WINANSI);

 	}

     }

     switch (index) {

 	case DDE_SERVERNAME: {

 	    serviceName = DdeSetServerName(interp, serviceName);

 	    if (serviceName != NULL) {

 		Tcl_SetStringObj(Tcl_GetObjResult(interp),

 			serviceName, -1);

 	    } else {

 		Tcl_ResetResult(interp);

 	    }

 	    break;

 	}

 	case DDE_EXECUTE: {

 	    dataString = Tcl_GetStringFromObj(objv[firstArg + 2], &dataLength);

 	    if (dataLength == 0) {

 		Tcl_SetStringObj(Tcl_GetObjResult(interp),

 			"cannot execute null data", -1);

 		result = TCL_ERROR;

 		break;

 	    }

 	    hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);

 	    DdeFreeStringHandle(ddeInstance, ddeService);

 	    DdeFreeStringHandle(ddeInstance, ddeTopic);

 	    if (hConv == NULL) {

 		SetDdeError(interp);

 		result = TCL_ERROR;

 		break;

 	    }

 	    ddeData = DdeCreateDataHandle(ddeInstance, dataString,

 		    (DWORD) dataLength+1, 0, 0, CF_TEXT, 0);

 	    if (ddeData != NULL) {

 		if (async) {

 		    DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF, hConv, 0, 

 			    CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);

 		    DdeAbandonTransaction(ddeInstance, hConv, 

 			    ddeResult);

 		} else {

 		    ddeReturn = DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF,

 			    hConv, 0, CF_TEXT, XTYP_EXECUTE, 30000, NULL);

 		    if (ddeReturn == 0) {

 			SetDdeError(interp);

 			result = TCL_ERROR;

 		    }

 		}

 		DdeFreeDataHandle(ddeData);

 	    } else {

 		SetDdeError(interp);

 		result = TCL_ERROR;

 	    }

 	    break;

 	}

 	case DDE_REQUEST: {

 	    itemString = Tcl_GetStringFromObj(objv[firstArg + 2], &length);

 	    if (length == 0) {

 		Tcl_SetStringObj(Tcl_GetObjResult(interp),

 			"cannot request value of null data", -1);

 		goto errorNoResult;

 	    }

 	    hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);

 	    DdeFreeStringHandle(ddeInstance, ddeService);

 	    DdeFreeStringHandle(ddeInstance, ddeTopic);

 	    if (hConv == NULL) {

 		SetDdeError(interp);

 		result = TCL_ERROR;

 	    } else {

 		Tcl_Obj *returnObjPtr;

 		ddeItem = DdeCreateStringHandle(ddeInstance, 

                         itemString, CP_WINANSI);

 		if (ddeItem != NULL) {

 		    ddeData = DdeClientTransaction(NULL, 0, hConv, ddeItem,

 			    CF_TEXT, XTYP_REQUEST, 5000, NULL);

 		    if (ddeData == NULL) {

 			SetDdeError(interp);

 			result = TCL_ERROR;

 		    } else {

 			DWORD tmp;

 			dataString = DdeAccessData(ddeData, &tmp);

 			dataLength = tmp;

 			if (binary) {

 			    returnObjPtr = Tcl_NewByteArrayObj(dataString,

 				    dataLength);

 			} else {

 			    returnObjPtr = Tcl_NewStringObj(dataString, -1);

 			}

 			DdeUnaccessData(ddeData);

 			DdeFreeDataHandle(ddeData);

 			Tcl_SetObjResult(interp, returnObjPtr);

 		    }

 		} else {

 		    SetDdeError(interp);

 		    result = TCL_ERROR;

 		}

 	    }

 	    break;

 	}

 	case DDE_POKE: {

 	    itemString = Tcl_GetStringFromObj(objv[firstArg + 2], &length);

 	    if (length == 0) {

 		Tcl_SetStringObj(Tcl_GetObjResult(interp),

 			"cannot have a null item", -1);

 		goto errorNoResult;

 	    }

 	    dataString = Tcl_GetStringFromObj(objv[firstArg + 3], &length);

 	    hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);

 	    DdeFreeStringHandle(ddeInstance, ddeService);

 	    DdeFreeStringHandle(ddeInstance, ddeTopic);

 	    if (hConv == NULL) {

 		SetDdeError(interp);

 		result = TCL_ERROR;

 	    } else {

 		ddeItem = DdeCreateStringHandle(ddeInstance, itemString,

 			CP_WINANSI);

 		if (ddeItem != NULL) {

 		    ddeData = DdeClientTransaction(dataString, (DWORD) length+1,

 			    hConv, ddeItem, CF_TEXT, XTYP_POKE, 5000, NULL);

 		    if (ddeData == NULL) {

 			SetDdeError(interp);

 			result = TCL_ERROR;

 		    }

 		} else {

 		    SetDdeError(interp);

 		    result = TCL_ERROR;

 		}

 	    }

 	    break;

 	}

 	case DDE_SERVICES: {

 	    result = DdeGetServicesList(interp, serviceName, topicName);

 	    break;

 	}

 	case DDE_EVAL: {

 	    if (serviceName == NULL) {

 		Tcl_SetStringObj(Tcl_GetObjResult(interp),

 			"invalid service name \"\"", -1);

 		goto errorNoResult;

 	    }

 	    objc -= (async + 3);

 	    ((Tcl_Obj **) objv) += (async + 3);

             /*

 	     * See if the target interpreter is local.  If so, execute

 	     * the command directly without going through the DDE server.

 	     * Don't exchange objects between interps.  The target interp could

 	     * compile an object, producing a bytecode structure that refers to 

 	     * other objects owned by the target interp.  If the target interp 

 	     * is then deleted, the bytecode structure would be referring to 

 	     * deallocated objects.

 	     */

 	    for (riPtr = tsdPtr->interpListPtr; riPtr != NULL;

 		 riPtr = riPtr->nextPtr) {

 		if (stricmp(serviceName, riPtr->name) == 0) {

 		    break;

 		}

 	    }

 	    if (riPtr != NULL) {

 		/*

 		 * This command is to a local interp. No need to go through

 		 * the server.

 		 */

 		Tcl_Preserve((ClientData) riPtr);

 		sendInterp = riPtr->interp;

 		Tcl_Preserve((ClientData) sendInterp);

 		/*

 		 * Don't exchange objects between interps.  The target interp

 		 * would compile an object, producing a bytecode structure that

 		 * refers to other objects owned by the target interp.  If the

 		 * target interp is then deleted, the bytecode structure would

 		 * be referring to deallocated objects.

 		 */

 		if (objc == 1) {

 		    result = Tcl_EvalObjEx(sendInterp, objv[0],

 			    TCL_EVAL_GLOBAL);

 		} else {

 		    objPtr = Tcl_ConcatObj(objc, objv);

 		    Tcl_IncrRefCount(objPtr);

 		    result = Tcl_EvalObjEx(sendInterp, objPtr,

 			    TCL_EVAL_GLOBAL);

 		    Tcl_DecrRefCount(objPtr);

 		}

 		if (interp != sendInterp) {

 		    if (result == TCL_ERROR) {

 			/*

 			 * An error occurred, so transfer error information

 			 * from the destination interpreter back to our

 			 * interpreter.

 			 */

 			Tcl_ResetResult(interp);

 			objPtr = Tcl_GetVar2Ex(sendInterp, "errorInfo", NULL, 

 				TCL_GLOBAL_ONLY);

 			string = Tcl_GetStringFromObj(objPtr, &length);

 			Tcl_AddObjErrorInfo(interp, string, length);

 			objPtr = Tcl_GetVar2Ex(sendInterp, "errorCode", NULL,

 				TCL_GLOBAL_ONLY);

 			Tcl_SetObjErrorCode(interp, objPtr);

 		    }

 		    Tcl_SetObjResult(interp, Tcl_GetObjResult(sendInterp));

 		}

 		Tcl_Release((ClientData) riPtr);

 		Tcl_Release((ClientData) sendInterp);

 	    } else {

 		/*

 		 * This is a non-local request. Send the script to the server

 		 * and poll it for a result.

 		 */

 		if (MakeDdeConnection(interp, serviceName, &hConv) != TCL_OK) {

 		    goto error;

 		}

 		objPtr = Tcl_ConcatObj(objc, objv);

 		string = Tcl_GetStringFromObj(objPtr, &length);

 		ddeItemData = DdeCreateDataHandle(ddeInstance, string,

 			(DWORD) length+1, 0, 0, CF_TEXT, 0);

 		if (async) {

 		    ddeData = DdeClientTransaction((LPBYTE) ddeItemData,

 			    0xFFFFFFFF, hConv, 0,

 			    CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);

 		    DdeAbandonTransaction(ddeInstance, hConv, ddeResult);

 		} else {

 		    ddeData = DdeClientTransaction((LPBYTE) ddeItemData,

 			    0xFFFFFFFF, hConv, 0,

 			    CF_TEXT, XTYP_EXECUTE, 30000, NULL);

 		    if (ddeData != 0) {

 			ddeCookie = DdeCreateStringHandle(ddeInstance, 

 				"$TCLEVAL$EXECUTE$RESULT", CP_WINANSI);

 			ddeData = DdeClientTransaction(NULL, 0, hConv,

 				ddeCookie, CF_TEXT, XTYP_REQUEST, 30000, NULL);

 		    }

 		}

 		Tcl_DecrRefCount(objPtr);

 		if (ddeData == 0) {

 		    SetDdeError(interp);

 		    goto errorNoResult;

 		}

 		if (async == 0) {

 		    Tcl_Obj *resultPtr;

 		    /*

 		     * The return handle has a two or four element list in

 		     * it. The first element is the return code (TCL_OK,

 		     * TCL_ERROR, etc.). The second is the result of the

 		     * script. If the return code is TCL_ERROR, then the third

 		     * element is the value of the variable "errorCode", and

 		     * the fourth is the value of the variable "errorInfo".

 		     */

 		    resultPtr = Tcl_NewObj();

 		    length = DdeGetData(ddeData, NULL, 0, 0);

 		    Tcl_SetObjLength(resultPtr, length);

 		    string = Tcl_GetString(resultPtr);

 		    DdeGetData(ddeData, string, (DWORD) length, 0);

 		    Tcl_SetObjLength(resultPtr, (int) strlen(string));

 		    if (Tcl_ListObjIndex(NULL, resultPtr, 0, &objPtr)

 			    != TCL_OK) {

 			Tcl_DecrRefCount(resultPtr);

 			goto error;

 		    }

 		    if (Tcl_GetIntFromObj(NULL, objPtr, &result) != TCL_OK) {

 			Tcl_DecrRefCount(resultPtr);

 			goto error;

 		    }

 		    if (result == TCL_ERROR) {

 			Tcl_ResetResult(interp);

 			if (Tcl_ListObjIndex(NULL, resultPtr, 3, &objPtr)

 				!= TCL_OK) {

 			    Tcl_DecrRefCount(resultPtr);

 			    goto error;

 			}

 			length = -1;

 			string = Tcl_GetStringFromObj(objPtr, &length);

 			Tcl_AddObjErrorInfo(interp, string, length);

 			Tcl_ListObjIndex(NULL, resultPtr, 2, &objPtr);

 			Tcl_SetObjErrorCode(interp, objPtr);

 		    }

 		    if (Tcl_ListObjIndex(NULL, resultPtr, 1, &objPtr)

 			    != TCL_OK) {

 			Tcl_DecrRefCount(resultPtr);

 			goto error;

 		    }

 		    Tcl_SetObjResult(interp, objPtr);

 		    Tcl_DecrRefCount(resultPtr);

 		}

 	    }

 	}

     }

     if (ddeCookie != NULL) {

 	DdeFreeStringHandle(ddeInstance, ddeCookie);

     }

     if (ddeItem != NULL) {

 	DdeFreeStringHandle(ddeInstance, ddeItem);

     }

     if (ddeItemData != NULL) {

 	DdeFreeDataHandle(ddeItemData);

     }

     if (ddeData != NULL) {

 	DdeFreeDataHandle(ddeData);

     }

     if (hConv != NULL) {

 	DdeDisconnect(hConv);

     }

     return result;

     error:

     Tcl_SetStringObj(Tcl_GetObjResult(interp),

 	    "invalid data returned from server", -1);

     errorNoResult:

     if (ddeCookie != NULL) {

 	DdeFreeStringHandle(ddeInstance, ddeCookie);

     }

     if (ddeItem != NULL) {

 	DdeFreeStringHandle(ddeInstance, ddeItem);

     }

     if (ddeItemData != NULL) {

 	DdeFreeDataHandle(ddeItemData);

     }

     if (ddeData != NULL) {

 	DdeFreeDataHandle(ddeData);

     }

     if (hConv != NULL) {

 	DdeDisconnect(hConv);

     }

     return TCL_ERROR;

 }