如何用SetParent设置为模态的窗口?

[zzh_haiz]

线程1显示了一个画面A.
现在要线程2(该线程只知道A的窗口句柄)显示一个画面B在A之上,同时,
使得在点A中的按钮时,不能响应.
用SetParent能实现吗,请大虾指教.

[zzh_haiz]

up!

[zzh_haiz]

如何在子线程中显示messagebox?

[zzh_haiz]

DWORD WINAPI ThreadProc( LPVOID lpParameter )
{
ShowMessage("ThreadProc");
return 1;
}


//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
DWORD dwThreadID = 0;
::CreateThread( NULL, 0, ThreadProc, this, 0, &dwThreadID );
return;
}

这样也会有错?郁闷啊!

[cczlp]

用MessageBox(NULL, "ThreadProc", "", 0);代替ShowMessage("ThreadProc");