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CWndCMDMSG msg;
COPYDATASTRUCT stCpy;
stCpy.dwData = 0;
stCpy.cbData = sizeof(CWndCMDMSG);
stCpy.lpData = &msg;
LRESULT lr = ::SendMessage(hWnd,WM_COPYDATA,NULL,(LPARAM)&stCpy);
SendMessage(hWnd,WM_COPYDATA,0,(LPARAM)&stCpy);
这样就能正确发送了,其他什么都没变
环境是xp+vc6,win32 application项目