十年前碰过MFC，现在捡起来玩玩，忽然觉得都忘了，碰巧最近一个项目需要，所以贴出来一段demo。

自定义消息

BEGIN_MESSAGE_MAP(CMFCApplication1Dlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDOK, &CMFCApplication1Dlg::OnBnClickedOk)
    ON_MESSAGE(WM_UPDATELABEL, onUpdateLabel)
END_MESSAGE_MAP()

Hook回调定义，传递消息的时候要注意HWnd和传的结构一定是要new出来，接收消息时释放。

HHOOK glHook = NULL;

LRESULT CALLBACK MouseProc(int nCode, WPARAM wparam, LPARAM lparam)
{
    if (glWnd && IsWindow(glWnd))
    {
        PMOUSEHOOKSTRUCT mh = (PMOUSEHOOKSTRUCT)lparam;
        POINT* newPt = new POINT;
        newPt->x = mh->pt.x;
        newPt->y = mh->pt.y;

        ::PostMessage(glWnd, WM_UPDATELABEL, 0, (LPARAM)newPt);
    }

    return CallNextHookEx(glHook, nCode, wparam, lparam);
}

自定义消息处理函数

LRESULT CMFCApplication1Dlg::onUpdateLabel(WPARAM wParam, LPARAM lParam)
{
    POINT* mh = (POINT*)lParam;
    if (mh) {
        CString a;
        a.Format(_T("pt2=> x:%d,y:%d\n"), mh->x, mh->y);
        GetDlgItem(IDC_STATIC2)->SetWindowText(a);

// 将传过来的数据释放掉
        delete mh;
        mh = NULL;
    }

    return 0;
}

注册钩子，在初始化函数中注册全局钩子

// TODO: 在此添加额外的初始化代码

    glWnd = this->GetSafeHwnd();

    HINSTANCE instance = NULL;
    instance = GetModuleHandle(NULL);
    printf("The instance is :%p", instance);

    glHook = SetWindowsHookEx(WH_MOUSE_LL, MouseProc, instance, 0);

因为demo是个基于对话框的，所以在OnCancel中处理下释放钩子的过程

void CMFCApplication1Dlg::OnCancel()
{
    OutputDebugString("Release the mouse hook");

    if (glHook) {
        UnhookWindowsHookEx(glHook);
    }

    CDialog::OnCancel();
}

下面是置前窗口和模拟点击

BOOL focusWnd(HWND targetWnd)
{
    BOOL validWindow = FALSE;
    if (IsWindow(targetWnd)) {
        ::SetForegroundWindow(targetWnd);
        validWindow = TRUE;
    }
    return validWindow;
}

void simulateClick(POINT pt)
{
    SetCursorPos(pt.x, pt.y);
    Sleep(100);
    mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0);//鼠标down事件
    Sleep(100);
    mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);//鼠标up事件
}

哦了，钩子很强大