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Wrapper for wsprintf function

Started by Ace17 Oct 20, 2001 at 12:23 PM 1 reply 850+ views

Original Post

Oct 20, 2001 at 12:23 PM

I''m planning to write a logger class I need a function like this : void Output(char* s, ...) { char buffer[256]; wsprintf(buffer, s, ...); fwrite(buffer, 1, strlen(buffer), file); } Use like this : Output("value = %d ", value); Output("%d %d %d", int(1), int(2), int(3)); The syntax isn''t correct, of course. So if somebody knows the right syntax... Thanx

VolkerG

Oct 20, 2001 at 1:04 PM

look for wvsprintf and va_arg, va_end and va_start in the MSDN.
Here is an example how to handle the variable argument;

  
	void _Trace (LPCTSTR lpszFormat, ...)
	{
		va_list argList;
		TCHAR szStrBuffer[1024];

		va_start (argList, lpszFormat);
		_vsntprintf (szStrBuffer, sizeof (szStrBuffer) / sizeof (szStrBuffer[0]), lpszFormat,
			argList);
		OutputDebugString (szStrBuffer);
		OutputDebugString (_T("\n"));
		va_end (argList);
	}

Edited by - VolkerG on October 20, 2001 2:04:45 PM

Gorg

Oct 20, 2001 at 1:14 PM

If you are using C++, you should know that the STL has something call a string stream that can do this very nicely.



#include 


...

std::ostringstream os;

int j = 3;

float v = 2;


os << "my int value is : " << j 
   << ". My float value is : " << v;

std::string theStringFromTheOs = os.str();

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