c++ - 封装WndProc问题

Question

好的，所以我写了一个基本类来封装 win32 窗口。我最终创建了一个静态路由器回调函数来将消息路由到该类的另一个函数。

编辑好我明白了

m_MainWindowHandle = CreateWindowEx(
    windowFormat, 
    L"LUDO ENGINE", 
    m_WindowName.c_str(), 
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,
    0,
    m_WindowDimensions.first,
    m_WindowDimensions.second,
    NULL, 
    NULL,
    m_EngineInstance,
    (void*)this);

我忘了传入 (void*)this 指针。 AJKFHDJKDF

LRESULT CALLBACK Test::EngineBase::WndRouter(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{


    Test::EngineBase *base = NULL;

    if(message == WM_NCCREATE)
    {
        base = reinterpret_cast<Test::EngineBase*>((LONG)((LPCREATESTRUCT)lParam)->lpCreateParams);
        SetWindowLongPtr(hWnd, GWL_USERDATA, (LONG_PTR)base);
    }
    else
    {
        base = reinterpret_cast<Test::EngineBase*>(GetWindowLongPtr(hWnd, GWL_USERDATA));
    }

    if(base == NULL)
    {
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    base->SetHWnd(hWnd);
    return base->WndProc(hWnd, message, wParam, lParam);
}

调用这个函数:

LRESULT CALLBACK Test::EngineBase::WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;

    switch (message)
    {
    case WM_KEYDOWN:
        m_InputManager->GetKeyboard()->SetKeyPressed(static_cast<int>(wParam));
        break;
    case WM_KEYUP:
        m_InputManager->GetKeyboard()->SetKeyUnpressed(static_cast<int>(wParam));
        break;
    case WM_MOUSEMOVE:
    case WM_NCMOUSEMOVE:
        m_InputManager->GetMouse()->SetMouseMouse(LOWORD(lParam),HIWORD(lParam));
        break;
    case WM_MOUSEWHEEL:
        break;
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
            //case IDM_ABOUT:
            //    //DialogBox(m_EngineInstance, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            //    //break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

然后我继承自EngineBase。现在 WndRouter 总是被调用，而不是总是导致 base == NULL，因此它实际上从未调用 WndProc 函数。

我做错了什么？

编辑

以下是我如何将初始消息输入引擎:

while (returnValue == 9999)
{
    engine->Update();
    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
    {
        if (msg.message == WM_QUIT)
        {                
            returnValue = static_cast<int>(msg.wParam);
        }

        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

}

这里是标题:

namespace Test
{   
    //forward defines
    namespace Input
    {
        class InputManager;
    }


    // main classs
    class EngineBase
    {
    protected:
        virtual HRESULT SetKeyBindings();
        virtual HRESULT LoadResources();

        static LRESULT CALLBACK WndRouter(HWND hWnd,  UINT message,  WPARAM wParam,  LPARAM lParam);
        virtual LRESULT CALLBACK WndProc(HWND hWnd,  UINT message,  WPARAM wParam,  LPARAM lParam);

        // Use reference counting schematics to prevent deletion.
        boost::shared_ptr<Test::Input::InputManager> m_InputManager;
    public:
        EngineBase(__in const HINSTANCE engineHandleInstance);
        ~EngineBase();

        // Engine Specific things
        HRESULT InitializeEngine(__in const int nCmdShow, __in const std::pair<INT, INT>& windowDimensions, __in const Test::String& windowName);
        HRESULT Register(__in const WNDCLASSEX& windowDefs);

        // Game Specific things
        virtual HRESULT Initialize() = 0;
        virtual HRESULT Update();

        inline void SetHWnd(__in const HWND windowHandle)
        {
            m_MainWindowHandle = windowHandle;
        }

        inline const std::pair<INT, INT> GetWindowDimensions()
        {
            return m_WindowDimensions;
        }

    private:
        HRESULT InitializeSubSystems();

        // Win32 stuff
        HRESULT CheckForOtherInstance();
        WORD    RegisterEngineClass();
        WNDCLASSEX  m_WindowClass;
        HWND        m_MainWindowHandle;
        HINSTANCE   m_EngineInstance;
        HANDLE      m_Mutex;

        std::pair<INT, INT> m_WindowDimensions;
        Test::String m_WindowName;
    };
}

编辑 这就是我设置 windProc def 的方式

在 main.cpp 中

WNDCLASSEX windowClass;
windowClass.cbSize = sizeof(WNDCLASSEX);
windowClass.style = NULL;
windowClass.cbClsExtra = 0;
windowClass.cbWndExtra = 0;
windowClass.hIcon = LoadIcon(NULL, MAKEINTRESOURCE(1));
windowClass.hIconSm = LoadIcon(NULL, MAKEINTRESOURCE(2));
windowClass.hCursor = LoadCursor(NULL, IDC_ARROW);
windowClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
windowClass.lpszMenuName = NULL;
windowClass.lpszClassName = L"ENGINE";

if(FAILED(engine->Register(windowClass)))
{
    return FAIL;
}

Register 这样做:

HRESULT Test::EngineBase::Register(__in const WNDCLASSEX& windowDefs)
{
    HRESULT hr = S_OK;
    m_WindowClass = windowDefs;
    m_WindowClass.lpfnWndProc = WndRouter;
    m_WindowClass.hInstance = m_EngineInstance;

    if(!RegisterClassEx(&m_WindowClass))
    {
        hr = E_CANNOT_CREATE_WINDOW_CLASS;
        return hr;
    }
    return hr;
}

Answer 1

什么继承自 EngineBase？

如何让初始消息流入 EngineBase 的 WndProc？

您是否使用 GWL_WNDPROC 调用 SetWindowLong 以将窗口指向您的 WndProc？ (如果这样做，您可能会错过一些初始消息)。或者窗口的 WNDCLASS 是否指向您的 EngineBase::WndProc？