捕获异常并自动保存dump

/* 之所以应用程序捕获不到栈溢出异常，原因是因为新版本的CRT实现在异常处理中强制删除所有应用程序先前设置的捕获函数，如下所示：

__crtUnhandledException()
{
SetUnhandledExceptionFilter(NULL);

UnhandledExceptionFilter(&ExceptionPointers);
}
解决方法是拦截CRT调用SetUnhandledExceptionFilter函数，使之无效。在X86平台下，可以使用以下代码                                                                     * /


void ()
{
    void *addr = (void*)GetProcAddress(LoadLibrary(_T("kernel32.dll")), "SetUnhandledExceptionFilter");
    if (addr)
    {
        unsigned char code[16];
        int size = 0;

        code[size++] = 0x33;
        code[size++] = 0xC0;
        code[size++] = 0xC2;
        code[size++] = 0x04;
        code[size++] = 0x00;
        DWORD dwOldFlag, dwTempFlag;

        (void)VirtualProtect(addr, size, PAGE_READWRITE, &dwOldFlag);
        (void)WriteProcessMemory(GetCurrentProcess(), addr, code, size, NULL);
        (void)VirtualProtect(addr, size, dwOldFlag, &dwTempFlag);
    }
}

void WriteMiniDMP(struct _EXCEPTION_POINTERS *pExp)
{
    CString   strDumpFile;
    TCHAR szFilePath[MAX_PATH];
    GetModuleFileName(NULL, szFilePath, MAX_PATH);
    *strrchr(szFilePath, '\') = 0;

    SYSTEMTIME stTime;
    GetLocalTime(&stTime);

    // 保存fulldump
    {
        strDumpFile.Format("%s\[%02d-%02d %02d-%02d-%02d]full.dmp", szFilePath, stTime.wMonth, stTime.wDay, stTime.wHour, stTime.wMinute, stTime.wSecond);
        HANDLE   hFile = CreateFile(strDumpFile, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
        if (hFile != INVALID_HANDLE_VALUE)
        {
            MINIDUMP_EXCEPTION_INFORMATION   ExInfo;
            ExInfo.ThreadId = ::GetCurrentThreadId();
            ExInfo.ExceptionPointers = pExp;
            ExInfo.ClientPointers = NULL;
            //   write   the   dump 
            (void)MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), hFile, (MINIDUMP_TYPE)0x9b67, &ExInfo, NULL, NULL);
            CloseHandle(hFile);
        }
    }
}

LONG WINAPI ExpFilter(struct _EXCEPTION_POINTERS *pExp)
{
    static bool flag = false;
	   if (!flag){ // 防止多个线程同时写dump导致系统函数死锁
		flag = true;
		WriteMiniDMP(pExp);
		flag = false;
	}
    return EXCEPTION_EXECUTE_HANDLER;
}

int main(int argc, char* argv[])
{
	::SetUnhandledExceptionFilter(ExpFilter);
	//捕获crt的栈溢出异常
	if ("10" != getOSName()) // win10 系统不生效
	{
		DisableSetUnhandledExceptionFilter();
	}
    ........
}