c++ - MFC 在消息中发送对象

Question

我可以发送带有对象的消息吗？就像是：

myClass *myObj = new myClass();
pDlg->SendMessage(MyEvent, NULL, (LPARAM)&myObj); // Sends without any errors
...
afx_msg LRESULT MyApp::GetEvent(WPARAM wParam, LPARAM lParam)
{
    myClass *zxc = new myClass();
    zxc = lParam; // Something like this... but doesn't work
}

Answer 1

只需在适当的地方来回投射指针：

发件人：

pDlg->SendMessage(MyEvent, NULL, reinterpret_cast<LPARAM>(&myObj));

接收者：

afx_msg LRESULT MyApp::GetEvent(WPARAM wParam, LPARAM lParam)
{
    myClass * zxc = reinterpret_cast<myClass*>(lParam);
    // ...
}