c++ - 在子类 WinAPI 按钮中未收到 WM_COMMAND

Question

我有一个基本的包装类，用于使用 WinAPI 在 C++ 中创建的按钮。我尝试处理消息，但似乎并非所有内容都能到达我的WndProc

class MyButton {
public:
    MyButton(HINSTANCE, HWND);
private:
    HWND _hWnd;
    static LRESULT CALLBACK _WndProc(HWND, UINT, WPARAM, LPARAM, UINT_PTR, DWORD_PTR);
};

MyButton::MyButton(HINSTANCE hInst, HWND hParent)
{
    this->_hWnd = CreateWindow(
        TEXT("BUTTON"),
        TEXT("CLICK ME"),
        WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,
        10, 10,
        100, 25,
        hParent,
        NULL,
        hInst,
        this
    );

    SetWindowSubclass(this->_hWnd, this->_WndProc, 1, (DWORD_PTR)this);
}

LRESULT CALLBACK MyButton::_WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSub, DWORD_PTR dwRef)
{
    // MessageBox(NULL, L"TEST1", L"TEST1", MB_OK | MB_ICONINFORMATION);

    MyButton *pThis = (MyButton*)dwRef;

    switch (uMsg)
    {
    case WM_COMMAND:
        MessageBox(NULL, L"TEST2", L"TEST2", MB_OK | MB_ICONINFORMATION);
        break;
    }

    return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}

该函数被调用（显示了“TEST1”）但是当我单击按钮时，我看不到“TEST2”。我也试过了WM_CREATE，它也不起作用。我不知道传递给什么消息_WndProc