打印断言函数

在写directUi时，用到一些函数断言,记录下:

	assert(a != 0);      //assert.h,此函数会将错误信息显示在命令行中，在命令行中显示出错的语句和行数
	_ASSERTE(a != 0);   //crtdbg.h,此宏会显示出在此宏中的语句
	_ASSERT(a != 0);    //crtdbg.h,此宏不会显示在此宏中的语句，而只是显示出错的行数

这样写:

#ifdef _DEBUG
#define TRACE __Trace
#define TRACEMSG __TraceMsg
#else
#define TRACE
#define TRACEMSG _T("")
#endif

#define lengthof(x) (sizeof(x)/sizeof(*x))

void __Trace(LPCTSTR pstrFormat, ...)
{
#ifdef _DEBUG
	TCHAR szBuffer[300] = { 0 };
	va_list args;
	va_start(args, pstrFormat);
	::wvnsprintf(szBuffer, lengthof(szBuffer) - 2, pstrFormat, args);
	_tcscat(szBuffer, _T("\n"));
	va_end(args);
	::OutputDebugString(szBuffer);
#endif
}

LPCTSTR __TraceMsg(UINT uMsg)
{
#ifdef UNICODE
	#define MSGDEF(x) if(uMsg==x) return L#x
#else
	#define MSGDEF(x) if(uMsg==x) return #x
#endif
	MSGDEF(WM_SETCURSOR);
	MSGDEF(WM_NCHITTEST);
	MSGDEF(WM_NCPAINT);
	MSGDEF(WM_PAINT);
	MSGDEF(WM_ERASEBKGND);
	MSGDEF(WM_NCMOUSEMOVE);  
	MSGDEF(WM_MOUSEMOVE);
	MSGDEF(WM_MOUSELEAVE);
	MSGDEF(WM_MOUSEHOVER);   
	MSGDEF(WM_NOTIFY);
	MSGDEF(WM_COMMAND);
	MSGDEF(WM_MEASUREITEM);
	MSGDEF(WM_DRAWITEM);   
	MSGDEF(WM_LBUTTONDOWN);
	MSGDEF(WM_LBUTTONUP);
	MSGDEF(WM_LBUTTONDBLCLK);
	MSGDEF(WM_RBUTTONDOWN);
	MSGDEF(WM_RBUTTONUP);
	MSGDEF(WM_RBUTTONDBLCLK);
	MSGDEF(WM_SETFOCUS);
	MSGDEF(WM_KILLFOCUS);  
	MSGDEF(WM_MOVE);
	MSGDEF(WM_SIZE);
	MSGDEF(WM_SIZING);
	MSGDEF(WM_MOVING);
	MSGDEF(WM_GETMINMAXINFO);
	MSGDEF(WM_CAPTURECHANGED);
	MSGDEF(WM_WINDOWPOSCHANGED);
	MSGDEF(WM_WINDOWPOSCHANGING);   
	MSGDEF(WM_NCCALCSIZE);
	MSGDEF(WM_NCCREATE);
	MSGDEF(WM_NCDESTROY);
	MSGDEF(WM_TIMER);
	MSGDEF(WM_KEYDOWN);
	MSGDEF(WM_KEYUP);
	MSGDEF(WM_CHAR);
	MSGDEF(WM_SYSKEYDOWN);
	MSGDEF(WM_SYSKEYUP);
	MSGDEF(WM_SYSCOMMAND);
	MSGDEF(WM_SYSCHAR);
	MSGDEF(WM_VSCROLL);
	MSGDEF(WM_HSCROLL);
	MSGDEF(WM_CHAR);
	MSGDEF(WM_SHOWWINDOW);
	MSGDEF(WM_PARENTNOTIFY);
	MSGDEF(WM_CREATE);
	MSGDEF(WM_NCACTIVATE);
	MSGDEF(WM_ACTIVATE);
	MSGDEF(WM_ACTIVATEAPP);   
	MSGDEF(WM_CLOSE);
	MSGDEF(WM_DESTROY);
	MSGDEF(WM_GETICON);   
	MSGDEF(WM_GETTEXT);
	MSGDEF(WM_GETTEXTLENGTH); 
	static TCHAR szMsg[10];
	::wsprintf(szMsg, _T("0x%04X"), uMsg);
	return szMsg;
}

#

表示为后面的内容加上引号

#define tostring(x) L#x
tostring(abc) == L"abc"