MFC 线程中发送最小化消息失败

DWORD WINAPI RecThread(LPVOID lparam)

{

CTestMesDlg *pDlg = new CTestMesDlg;

pDlg->Receive();

return 0;

}

void CTestMesDlg::Receive()

{

::SendMessage(m_hWnd,MY_SC_MINISZIE,SC_MINIMIZE,0);

return ;

}

LRESULT CTestMesDlg::DefWindowProc(UINT message,WPARAM wParam,LPARAM lparam)

{

LRESULT lrst = CDialog::DefWindowProc(message,wParam,lparam);

if (!::IsWindow(m_hWnd))

return lrst;

if (message == MY_SC_MINISZIE && wParam == SC_MINIMIZE)

{AfxMessageBox("你好！");}

return lrst;}

void CTestMesDlg::OnBnClickedButton2()

{// TODO: 在此添加控件通知处理程序代码

HANDLE hThread = CreateThread(NULL,0,RecThread,NULL,0,NULL);

return ;

}