vc 阻止电脑休眠

vc 阻止电脑休眠

主要是使用API SetThreadExecutionState

详情参考

调用过这个API的线程不退出的话，系统就一直不会进入睡眠状态。

Demo，系统设置一分钟空闲就进入休眠状态，让线程运行2分钟

DWORD WINAPI ThreadProc(_In_ LPVOID lpParameter)
{
	if (SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED |
		ES_AWAYMODE_REQUIRED | ES_DISPLAY_REQUIRED) == NULL)
	{
		// try XP variant as well just to make sure 
		SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED);
	}  // if 

	for (int i = 0; i < 120; i++)
	{
		Sleep(1000);
		OutputDebugString(_T("Thread running...\r\n"));
	}
	OutputDebugString(_T("Thread Exit...\r\n"));
	return 0;
}

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_S3, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_S3));

	CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
	
	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}

结果是3分钟后系统进入休眠。