@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The OutputDebugString API Sends a string to the debugger for display. !!!!C# Signature: [DllImport("kernel32.dll")] static extern void OutputDebugString(string lpOutputString); !!!!VB.NET Signature: <DllImport("kernel32.dll")> _ Shared Sub OutputDebugString(ByVal lpOutputString As String) End Sub '''Or ''(as in VB 6)'' ''' Public Declare Sub OutputDebugString Lib "kernel32" Alias _ "OutputDebugStringA" (ByVal lpOutputString As String) !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: Get DebugView here (http://www.sysinternals.com/Utilities/DebugView.html) to display the output of OutputDebugString. This C# example extends the OutputDebugString(...) with variable arguments: public static void OutputDebugStringVarArg( string format, params object[] args) { try { OutputDebugString(string.Format(format, args)); } catch (Exception) { return; } } Now run the function as follows: OutputDebugStringVarArg("It is {0} past {1}", new object[] {5,10 }); Get OutputDebugString function implementation that accepts variable number of arguments like printf here (http://www.go4expert.com/forums/showthread.php?t=871) !!!!Sample Code: 1. Create a new C# windows console application project. 2. Add the following using System.Runtime.InteropServices; below using System.Text; 3. Add the following as the first statement of the main function. OutputDebugString("OutputDebugString Successfully executed"); Now execute the program with DebugView Open !!!!Alternative Managed API: System.Diagnostics.Debug.WriteLine System.Diagnostics.Debugger.Log Documentation: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/debug/base/outputdebugstring.asp
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