如何正确销毁从另一个线程运行的窗口

Question

我试图实现的目标是监听关于锁定、解锁等的会话通知。由于架构和避免阻塞主线程，我必须在另一个线程中进行。以下是我正在做的事情：

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_WTSSESSION_CHANGE:
switch (wParam) {
case WTS_CONSOLE_CONNECT:
case WTS_SESSION_LOGON:
case WTS_REMOTE_CONNECT:
case WTS_SESSION_UNLOCK:
case WTS_CONSOLE_DISCONNECT:
case WTS_REMOTE_DISCONNECT:
case WTS_SESSION_LOGOFF:
case WTS_SESSION_LOCK:
case WTS_SESSION_REMOTE_CONTROL:
case WTS_SESSION_CREATE:
case WTS_SESSION_TERMINATE:
break;
default:
break;
}
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
void startListeningNotifications()
{
const wchar_t g_szClassName[] = L"myWindowClass";
WNDCLASSEX wc = {};
wc.lpfnWndProc = WndProc;
wc.lpszClassName = g_szClassName;
wc.cbSize = sizeof(WNDCLASSEX);
if (!RegisterClassEx(&wc))
{
return;
}
HWND hwnd = CreateWindowEx(NULL, g_szClassName, L"", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, NULL, NULL, GetModuleHandle(NULL), NULL);
if (hwnd == NULL)
{
return;
}
if (!WTSRegisterSessionNotification(hwnd, NOTIFY_FOR_ALL_SESSIONS))
{
return;
}
ShowWindow(hwnd, SW_HIDE);
MSG Msg = {};
while (GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
}
int main()
{
std::thread listener(startListeningNotifications);
listener.join();
return 0;
}

我现在面临的问题是，我不知道如何正确地编写stopListeningNotifications((方法。我不得不以某种方式破坏我的窗口并退出消息循环。请建议如何安全地进行操作。提前谢谢。

Answer 1

提供的WndProc函数处理WM_CLOSE和WM_DESTROY。

case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;

因此，您可以使用线程中创建的窗口的hwnd发送WM_CLOSE消息：

PostMessage(hwnd, WM_CLOSE, 0, 0)