錯誤信息提示宏 MTVERIFY頭文件 MTVERIFY.H 源代碼

/**
 * MtVerify.h
 *
 * Error handling for applications in
 * "Multitheading Applications in Win32"
 *
 * The function PrintError() is marked as __inline so that it can be
 * included from one or more C or C++ files without multiple definition
 * errors. For the examples in this book, this works fine.
 * To use the PrintError() in an application, it should be taken out,
 * placed in its own source file, and the "__inline" declaration removed
 * so the function will be globally available.
 */

#pragma comment( lib, "USER32" )
#include <stdlib.h>
#include <crtdbg.h>
#define MTASSERT(a) _ASSERTE(a)

// 宏定義 __FILE__ 與__LINE__都是預處理符號提供錯誤信息的描述
// 如果a返回FALSE就執行PrintError函數
#define MTVERIFY(a) if (!(a)) PrintError(#a,__FILE__,__LINE__,GetLastError())

__inline void PrintError(LPSTR linedesc, LPSTR filename, int lineno, DWORD errnum)
{

LPSTR lpBuffer;
char errbuf[256];
#ifdef _WINDOWS
char modulename[MAX_PATH];
#else // _WINDOWS
DWORD numread;
#endif // _WINDOWS

// 把從GetLastError()返回的錯誤碼轉化爲錯誤信息
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
errnum,
LANG_NEUTRAL,
(LPTSTR)&lpBuffer,
0,
NULL );

wsprintf(errbuf, "/nThe following call failed at line %d in %s:/n/n"
  " %s/n/nReason: %s/n", lineno, filename, linedesc, lpBuffer);

// 如果是console程序就輸出信息到控制檯上
#ifndef _WINDOWS
WriteFile(GetStdHandle(STD_ERROR_HANDLE), errbuf, strlen(errbuf), &numread, FALSE );

// 等待3秒鐘是爲了使用者看到出錯信息
Sleep(3000);

// 如果是窗口程序就一彈出對話框的形式輸出錯誤信息
#else

// 當前exe文件的全路徑
GetModuleFileName(NULL, modulename, MAX_PATH);
// 置彈出窗口在最上層以免被忽略
MessageBox(NULL, errbuf, modulename, MB_ICONWARNING|MB_OK|MB_TASKMODAL|MB_SETFOREGROUND);
#endif
// 把結束代碼EXIT_FAILURE 交給操作系統
exit(EXIT_FAILURE);
}