Simple File Write

**like_no_other** · 11-12-2009

The Following code is used to keep a log about my process' activity. The problem is that it the debug output file gets the wrong name (unreadable characters). I can't figure out where my pointers go wild. Sorry for such a silly problem

.

Code:

#include "includes.h"
#include "externs.h"


HANDLE hDebug;
HANDLE mDebug;


void AddLog(char *buffer)
{
	#ifdef DEBUG
	DWORD dwBytesWritten=0;
	DWORD dwBytesToWrite=0;
	dwBytesToWrite =(DWORD) strlen(buffer);
	if( hDebug == INVALID_HANDLE_VALUE || hDebug == NULL )
	return;
	WaitForSingleObject(mDebug, INFINITE);
	
	while(dwBytesWritten < dwBytesToWrite)
	{
					
		WriteFile(hDebug, buffer+dwBytesWritten, dwBytesToWrite - dwBytesWritten, &dwBytesWritten,NULL);
		
	}	
	
	ReleaseMutex(mDebug);
	#endif
}

void StartDebug()
{

	wchar_t FileDebug[]={'d','e','b','u','g','.','e','t','h'};
	mDebug = CreateMutex(NULL, false, NULL);
	hDebug = CreateFile( (LPWSTR) FileDebug,
						GENERIC_WRITE,
						0,
						NULL,
						CREATE_ALWAYS,
						FILE_ATTRIBUTE_NORMAL,
						NULL
						);
			
						
	
						
								

}

**Joelito** · 11-12-2009

WriteFile must be using ANSI, try WriteFileW or define UNICODE in your header files, also you con use UNICODE as string type in your project's options.

**iMalc** · 11-13-2009

Code:

wchar_t FileDebug[]={'d','e','b','u','g','.','e','t','h'};

That's not right. CreateFile takes a null-terminated string, but you've declared it in such a way as to deliberately not null-terminate it for some reason.

You could simply write this:

Code:

wchar_t FileDebug[] = L"debug.eth";

or better yet just:

Code:

const wchar_t *FileDebug = L"debug.eth";

if you don't need to modify that string.

You might also benefit from using TCHAR instead of wchar_t to be agnostic to the unicode setting of your project. So the best option is probably:

Code:

const TCHAR *FileDebug = _T("debug.eth");

and you can drop the (LPWSTR) part.

**like_no_other** · 11-14-2009

Makes sense now. Thank you.

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