仍旧用sendmessage, 但是该message的值应该用RegisterWindowMessage 函数来注册。例: (未测试过)
UINT UTestMsg=RegisterWindowMessage("this is only a test");
.....
SendMessage(hWnd,UTestMsg,0,0);
在主程序中的消息同样用该字符串进行注册即可:
UINT UTestMsg=RegisterWindowMessage("this is only a test");
再在DefaultHandler 函数中处理该消息
void __fastcall TForm1::DefaultHandler(void* msg)