VC Activation Maximization Window

hWnd = FindWindow(NULL, szTaskExe);SetForegroundWindow(hWnd);BringWindowToTop(hWnd);SetCursorPos(100,200);//移动到某点坐标mouse_event(MOUSEEVENTF_LEFTDOWN,0,0,0,0);//点下左键

Here we can get the handle of the window with FindWindow. Here I created the B process through a process and then activated the window of B.
Without a mouse-click simulation, you will notice that the window's icon is activated on the status bar (the icon on the taskbar is blinking orange), but still not full screen. By simulating the mouse click, do the real activation, into the window of the message loop.

VC Activation Maximization Window