Win32显示系统调用失败后的错误信息

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于 2018-11-13 10:23:07 发布

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分类专栏： Win32 Windows

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本文详细介绍了在Windows环境下，如何使用GetLastError与FormatMessage函数组合显示系统错误信息的方法。通过三个不同的函数实现，展示了如何针对不同场景（如窗口消息拥有者、特定错误代码或无窗口上下文）获取并展示错误描述。

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DWORD ShowSystemError(HWND hwndMsgOwner)
{
	DWORD dwError = GetLastError();
	HLOCAL hlocal = NULL;
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
		NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), (TCHAR*)&hlocal, 0, NULL);
	MessageBox(hwndMsgOwner, (TCHAR*)LocalLock(hlocal), 0, 0);
	LocalFree(hlocal);
	return dwError;
}

void ShowSystemError(HWND hwndMsgOwner, DWORD dwError)
{
	HLOCAL hlocal = NULL;
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
		NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), (TCHAR*)&hlocal, 0, NULL);
	MessageBox(hwndMsgOwner, (TCHAR*)LocalLock(hlocal), 0, 0);
	LocalFree(hlocal);
}

//要调用setlocale(LC_ALL,"chs");
void ShowSystemError(DWORD dwError)
{
	HLOCAL hlocal = NULL;
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
		NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), (TCHAR*)&hlocal, 0, NULL);
	_tprintf(_T("%s"), (TCHAR*)LocalLock(hlocal));
	LocalFree(hlocal);
}