C++ 仅消息窗口不接收来自托盘图标的消息

我试图编写一个简单的可重用类来封装基本托盘图标的功能。这是我的第一个C++项目，我有一些问题：<强>为托盘图标创建的消息窗口没有收到任何消息<强>。该图标在任务栏中可见，并具有正确的工具提示，但单击该图标不会向“我的不可见窗口”发送任何消息

为了测试函数

WindowProcedure

是否被调用，我添加了一个

printf

语句，输出结果是函数在创建时被调用了4次，但没有更多，即使我单击了notify图标

为什么我的窗口没有收到来自托盘图标的任何消息？

这就是我所写的：

TrayIcon.h

：

class TrayIcon {

    public:
        TrayIcon();
        ~TrayIcon();
        void Show();
        /*...*/
        static void Initialize();


    private:
        static LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
        /*...*/    
};

// Static initializer
int TrayIcon::_idCounter = 1;
void TrayIcon::Initialize() // This method is called just once
{
    // Registers the class for the tray windows
    WNDCLASSEX wx = {};
    wx.lpfnWndProc = TrayIcon::WindowProcedure;
    wx.lpszClassName = TRAYICON_WINDOW_CLASSNAME;
    wx.cbSize = sizeof(WNDCLASSEX);
    RegisterClassEx(&wx);
}

// Constructor
TrayIcon::TrayIcon()
{
    // Creates an hidden message-only window
    HWND hWnd = CreateWindowEx(0, TRAYICON_WINDOW_CLASSNAME, "trayiconwindow", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
    SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG)this);

    // Creates the notify icon
    NOTIFYICONDATA icon;
    memset( &icon, 0, sizeof( NOTIFYICONDATA ) ) ;
    icon.cbSize = sizeof(NOTIFYICONDATA);
    icon.hWnd = hWnd;
    icon.uID = TrayIcon::_idCounter++;
    icon.uCallbackMessage = WM_TRAYICON; //Set up our invented Windows Message
    icon.uFlags = NIF_MESSAGE;
    this->_iconData = icon;
}

// Shows the tray icon
void TrayIcon::Show()
{
    // ...
    Shell_NotifyIcon(NIM_ADD, &this->_iconData);
}

// Processes the messages received by the hidden window for each icon
LRESULT CALLBACK TrayIcon::WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    TrayIcon* icon = (TrayIcon*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
    printf("Window Procedure called.\n\r");
    return DefWindowProc(hwnd, message, wParam, lParam);
}

TrayIcon.cpp

：

class TrayIcon {

    public:
        TrayIcon();
        ~TrayIcon();
        void Show();
        /*...*/
        static void Initialize();


    private:
        static LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
        /*...*/    
};

// Static initializer
int TrayIcon::_idCounter = 1;
void TrayIcon::Initialize() // This method is called just once
{
    // Registers the class for the tray windows
    WNDCLASSEX wx = {};
    wx.lpfnWndProc = TrayIcon::WindowProcedure;
    wx.lpszClassName = TRAYICON_WINDOW_CLASSNAME;
    wx.cbSize = sizeof(WNDCLASSEX);
    RegisterClassEx(&wx);
}

// Constructor
TrayIcon::TrayIcon()
{
    // Creates an hidden message-only window
    HWND hWnd = CreateWindowEx(0, TRAYICON_WINDOW_CLASSNAME, "trayiconwindow", 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
    SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG)this);

    // Creates the notify icon
    NOTIFYICONDATA icon;
    memset( &icon, 0, sizeof( NOTIFYICONDATA ) ) ;
    icon.cbSize = sizeof(NOTIFYICONDATA);
    icon.hWnd = hWnd;
    icon.uID = TrayIcon::_idCounter++;
    icon.uCallbackMessage = WM_TRAYICON; //Set up our invented Windows Message
    icon.uFlags = NIF_MESSAGE;
    this->_iconData = icon;
}

// Shows the tray icon
void TrayIcon::Show()
{
    // ...
    Shell_NotifyIcon(NIM_ADD, &this->_iconData);
}

// Processes the messages received by the hidden window for each icon
LRESULT CALLBACK TrayIcon::WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    TrayIcon* icon = (TrayIcon*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
    printf("Window Procedure called.\n\r");
    return DefWindowProc(hwnd, message, wParam, lParam);
}

这就是我如何使用这个类：

int main()
{
    // Creates a new Tray icon
    TrayIcon::Initialize();
    TrayIcon* icon = new TrayIcon();
    icon->SetTooltip("Foo Tooltip");
    icon->SetIcon(...);
    icon->Show();

    // Waits for user input
    void* tmp;
    cin >> tmp;
    return 0;
}

---

谢谢您的时间。

您需要某种形式的消息循环，而不是通过阻塞调用来输入内容。尝试规范消息循环：

MSG msg;
while (GetMessage(&msg, nullptr, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
}

---

谢谢，它工作得很好。我打赌我昨天试过了，但没用。我绝对应该在午夜后停止编程！