HWND hW=FindWindowEx(hWndTmp, NULL, "Edit", NULL); //hWndTmp is handle of Notepad got from WinSpy
::SendMessage(hW,WM_SETTEXT,0,(LPARAM)"aaa" );
HWND hW=FindWindowEx(hWndTmp, NULL, "Edit", NULL); //hWndTmp is handle of Notepad got from WinSpy
::SendMessage(hW,WM_SETTEXT,0,(LPARAM)"aaa" );