Simple File Write

This is a discussion on Simple File Write within the Windows Programming forums, part of the Platform Specific Boards category; The Following code is used to keep a log about my process' activity. The problem is that it the debug ...

  1. #1
    Registered User
    Join Date
    Sep 2008

    Simple File Write

    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 .
    #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 )
    	WaitForSingleObject(mDebug, INFINITE);
    	while(dwBytesWritten < dwBytesToWrite)
    		WriteFile(hDebug, buffer+dwBytesWritten, dwBytesToWrite - dwBytesWritten, &dwBytesWritten,NULL);
    void StartDebug()
    	wchar_t FileDebug[]={'d','e','b','u','g','.','e','t','h'};
    	mDebug = CreateMutex(NULL, false, NULL);
    	hDebug = CreateFile( (LPWSTR) FileDebug,

  2. #2
    Registered User Joelito's Avatar
    Join Date
    Mar 2005
    Tijuana, BC, México
    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.
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  3. #3
    Algorithm Dissector iMalc's Avatar
    Join Date
    Dec 2005
    New Zealand
    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:
    wchar_t FileDebug[] = L"debug.eth";
    or better yet just:
    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:
    const TCHAR *FileDebug = _T("debug.eth");
    and you can drop the (LPWSTR) part.
    Last edited by iMalc; 11-13-2009 at 02:10 PM.
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  4. #4
    Registered User
    Join Date
    Sep 2008
    Makes sense now. Thank you.

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