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8.8

OutputDebugString and sprintf

Asked by deming in Microsoft Visual C++, Microsoft Visual C++.Net, C / C++ / C# Editors and IDEs

Tags: C++, Visual Studio 2008

Wow, this has been driving me crazy for 2 days now. Please help!

I have written a DLL in C++ VS2008. I simply want to write some debug messages to the output window of the VS IDE which include text and variables. I want something like:

sprintf( "Var a = %d, var b= %d",a,b); // Send to Output window of debugger

I found some code on EE (see below) which should work but doesn't.

QUESTION:
Tell me what is wrong with my code or simply trash my code and give me some code that will acomplish my objective.

View the Solution FREE for 30 Days

         
           
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             /////////////////////////////////////////////////////////
//                                                     
//	This is example code for a simple DLL
//                                                         
/////////////////////////////////////////////////////////
#include "StdAfx.h"
#include "string"
 
/////////////////////////////////////////////////////////
//                                                     
//	DLLMain
//                                                         
/////////////////////////////////////////////////////////
 
BOOL APIENTRY DllMain
( HANDLE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved )
{
    switch ( ul_reason_for_call )
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
		break;
    }
    return TRUE ;
}
 
/****************************************************************************
* DBGprintf
*
* This debugging function prints out a string to the debug output.
* An optional set of substitutional parameters can be specified,
* and the final output will be the processed result of these combined
* with the format string, just like printf.  A newline is always
* output after every call to this function.
*
* Arguments:
*   LPTSTR fmt - Format string (printf style).
*   ...        - Variable number of arguments.
* Returns:
*    VOID
\****************************************************************************/
 
void DbgPrintf(LPTSTR fmt,...    )
{
    va_list marker;
    TCHAR szBuf[256];
 
    va_start(marker, fmt);
    wvsprintf(szBuf, fmt, marker);
    va_end(marker);
 
    OutputDebugString(szBuf);
    OutputDebugString(TEXT("\r\n"));
}
 
////////////////////////////////////////////////////////
//
//	Example code for simple test function
//
////////////////////////////////////////////////////////
int __stdcall AddThem( int a, int b )
{
	//OutputDebugString("The value of a=",a,", and b=",b, ",and myStr=",myStr);
	DbgPrintf("Just a test %d, %f ",1.23f,4.56f);
	double da = 7.89, db =90.12;
	// a=7, b=4 
	DbgPrintf("Just a test1 a= %d, b= %f ",a,b);
	DbgPrintf("Just a test2 a= %d, b= %f ",da,db);
	return a + b ;
}
 
OUTPUT:
 
Just a test -2147483648, f 
Just a test1 a= 7, b= f 
Just a test2 a= 687194767, b= f
           
         

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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OutputDebugString and sprintf

Asked by deming in Microsoft Visual C++, Microsoft Visual C++.Net, C / C++ / C# Editors and IDEs

Tags: C++, Visual Studio 2008

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