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DWOND a;
HWND clientHwnd;
COPYDATASTRUCT cpd;
cpd.dwData = 1;
cpd.cbData = 4;
cpd.lpData = (void*)&a;
SendMessageA(clientHwnd,WM_COPYDATA,NULL,(LPARAM)&cpd);
uint a;
IntPtr clientHwnd;
COPYDATASTRUCT cpd = new COPYDATASTRUCT();
cpd.dwData = 1;
cpd.cbData = 4;
cpd.lpData = a;
SendMessage(clientHwnd,WM_COPYDATA,0,cpd);