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using System;
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namespace GenericHid
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{
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/// <summary>
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/// Used only in Debug.Write statements.
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/// </summary>
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///
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internal sealed partial class Debugging
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{
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/// <summary>
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/// Get text that describes the result of an API call.
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/// </summary>
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///
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/// <param name="functionName"> the name of the API function. </param>
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///
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/// <returns>
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/// The text.
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/// </returns>
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internal String ResultOfApiCall( String functionName )
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{
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var resultString = new String(Convert.ToChar( 0 ), 129 );
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// Returns the result code for the last API call.
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Int32 resultCode = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
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// Get the result message that corresponds to the code.
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Int64 temp = 0;
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Int32 bytes = NativeMethods.FormatMessage(NativeMethods.FormatMessageFromSystem, ref temp, resultCode, 0, resultString, 128, 0);
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// Subtract two characters from the message to strip the CR and LF.
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if ( bytes > 2 )
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{
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resultString = resultString.Remove( bytes - 2, 2 );
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}
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// Create the String to return.
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resultString = Environment.NewLine + functionName + Environment.NewLine + "Result = " + resultString + Environment.NewLine;
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return resultString;
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}
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}
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}
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