一个窗口是否可以在不是活动窗口的情况下接收消息？

Question

我已经测试了创建一个默认窗口，并且我已经在与主线程不同的线程上测试了一个仅消息窗口。

目标是从主线程外部接收来自HID设备的

WM_INPUT

。原因是主线程循环的运行速度比处理输入所需的速度慢得多。

只要主线程的主窗口不是活动窗口，两个窗口似乎都可以工作。

这个问题有什么可能的解决方案？

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编辑：

我没有添加代码，因为它基本上是样板代码，但由于许多评论希望看到一些代码，我将添加它，因为它可能真的很有帮助。

//FIRST: CLASS REGISTRATION:

WNDCLASSEXW wcex;
    
wchar_t local_name[] = L"ClassGenericName";
wcsncat(local_name, 
    std::to_wstring(GetCurrentThreadId()).c_str(), 
    std::to_wstring(GetCurrentThreadId()).size());
//You can ignore naming process as it was made to make more than one window for more than one thread, just for testing purposes.
    
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINAPITEST));
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_WINAPITEST);
wcex.lpszClassName = local_name;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
    
RegisterClassExW(&wcex);
    
hWnd = CreateWindowEx(0, wcex.lpszClassName, L"no title", 0, 0, 0, 0, 0, HWND_MESSAGE, 0, 0, 0);
    
ShowWindow(hWnd, 3);//Testing, I switch it on and off.
UpdateWindow(hWnd); 
    
    
//SECOND: DEVICE REGISTRATION:
    
RAWINPUTDEVICE RID;
RID.usUsagePage = 0x01;
RID.usUsage = 0x05;
RID.dwFlags = 0;
RID.hwndTarget = 0;
RegisterRawInputDevices(&RID, 1, sizeof(RID));
    
//THIRD: THREAD FUNCTION MESSAGE LOOP.
    
HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINAPITEST));
MSG msg;
while (GetMessageW(&msg, nullptr, 0, 0))
{
    if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}
    
//FOURTH: WINDOW PROCEDURE MESSAGE PROCESSING.
    
//I don't think I need to add this as it is boilerplate and tested to work all the time. If wanted I'd add it tho.
    
//FIVE: Thanks for helpful comments. My bad for not adding code ahead of time.

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编辑：

解决：注册时设置HID目标窗口句柄的问题。我将它设置为 null，这使得活动窗口成为目标。相反，我应该将它设置为单独线程的窗口。我做到了，它奏效了。

Answer 1

解决：注册时设置HID目标窗口句柄的问题。我将它设置为 null，这使得活动窗口成为目标。相反，我应该将它设置为单独线程的窗口。我做到了，它奏效了。