windows - 未收到 WM_LBUTTONDOWN 和 WM_LBUTTONUP

Question

我创建了顶层窗口，但由于未知原因，我的 WNDPROC 没有收到 WM_LBUTTONDOWN/WM_LBUTTONUP 和 WM_MOUSEMOVE 消息。

有什么建议吗？

相关代码:

WNDCLASSEX wc = {0};
Wc.cbSize = 48;
Wc.cbWndExtra = 80;
Wc.hCursor = LoadCursorW(g_hInstance, MAKEINTRESOURCEW(1002));
Wc.style = CS_GLOBALCLASS | CS_DBLCLKS;
Wc.lpszClassName = Ici[dItemIndex].sInit;
Wc.lpfnWndProc = Ici[dItemIndex].wInit;

RegisterClassExW(&Wc);

g_hRuler1 = CreateWindowExW(WS_EX_TOOLWINDOW,
                            RULER_CONTROL,
                            L"",
                            WS_POPUP|WS_VISIBLE|0x1,
                            100 ,100, 40, RECTHEIGHT(g_rScreen),
                            NULL, NULL, hInst, NULL);

LRESULT WINAPI Ruler_Window(HWND hWindow, UINT uWindow, WPARAM wParam, LPARAM lParam)
{
    if (uWindow == WM_GETMINMAXINFO)
    {
        goto DODEFAULT;
    }

    if (uWindow == WM_NCCREATE)
    {
        g_pGRI = RULER_ALLOCATE();

        RULER_SET_POINTER(hWindow, (LONG_PTR)g_pGRI);

        return 1L;
    }

    g_pGRI = RULER_GET_POINTER(hWindow);

    g_pGRI->hWindow = hWindow;

    switch(uWindow)
    {
    case WM_CREATE:
        {
            return Ruler_OnCreate(wParam, lParam);
        }

    case WM_PAINT:
        {
            return Ruler_OnPaint(wParam, lParam);
        }

    case WM_MOUSEMOVE:
        {
            return Ruler_OnMouseMove(wParam, lParam);
        }

    case WM_DESTROY:
        {
            return Ruler_OnDestroy(wParam, lParam);
        }

    case WM_SETCURSOR:
        {
            return Ruler_OnSetCursor(wParam, lParam);
        }

    case WM_LBUTTONDOWN:
        {
            return Ruler_OnLeftButtonDown(wParam, lParam);
        }

    case WM_LBUTTONUP:
        {
            return Ruler_OnLeftButtonUp(wParam, lParam);
        }

    case GM_SETINDICATORS:
        {
            return Ruler_OnSetIndicators(wParam, lParam);
        }

DODEFAULT:
    return DefWindowProcW(hWindow, uWindow, wParam, lParam);
    }

}

单击左键后窗口的 Spy++ 消息。

Answer 1

我认为这里的问题是您很可能没有从自定义 wndProc 方法 (Ruler_Window) 中调用 DefWindowProc。

wndProc 中的代码结构有点……有趣。

您在 switch 语句中处理您感兴趣的消息(WM_NCCREATE 除外，这很好)，但您的 switch 语句实际上没有 default: 条目...相反，您创建了一个名为 DODEFAULT 的标签，您只引用一次 - 当消息为 WM_GETMINMAXINFO 时，您可以转到 DODEFAULT。忽略此处使用 goto 的问题，您基本上不会处理代码中列出的消息以外的任何消息，更重要的是，您不会将其他消息传递给默认处理程序.

Ruler_Window 方法的非常快速、非常简单的重写:

LRESULT WINAPI Ruler_Window(HWND hWindow, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    if (uMsg == WM_NCCREATE)
    {
        g_pGRI = RULER_ALLOCATE();
        RULER_SET_POINTER(hWindow, (LONG_PTR)g_pGRI);
        return DefWindowProcW(hWindow, uMsg, wParam, lParam);
    }

    // not sure what g_pGRI is, guessing it's a global?
    // should this actually be passed into the handlers below?
    g_pGRI = RULER_GET_POINTER(hWindow);
    g_pGRI->hWindow = hWindow;

    switch(uMsg)
    {
    case WM_CREATE:
        return Ruler_OnCreate(wParam, lParam);

    case WM_PAINT:
        return Ruler_OnPaint(wParam, lParam);

    case WM_MOUSEMOVE:
        return Ruler_OnMouseMove(wParam, lParam);

    case WM_DESTROY:
        return Ruler_OnDestroy(wParam, lParam);

    case WM_SETCURSOR:
        return Ruler_OnSetCursor(wParam, lParam);

    case WM_LBUTTONDOWN:
        return Ruler_OnLeftButtonDown(wParam, lParam);

    case WM_LBUTTONUP:
        return Ruler_OnLeftButtonUp(wParam, lParam);

    case GM_SETINDICATORS:
        return Ruler_OnSetIndicators(wParam, lParam);

    default:
        break;
    }

    return DefWindowProcW(hWindow, uMsg, wParam, lParam);
}

请注意，恕我直言，我还将消息参数的名称更改为 uMsg，因为这样可以更轻松地阅读代码。