How to WinForm in C + + when the form is full-screen and transparent but can make the keyboard mouse through, add a full screen mask

1, the form of the Opacity from 100% to the transparency we want, such as this->opacity = 0.2;

2. In the Form_Load function, add:

HWND Hwnd=::findwindow (null,l "Form1");
DWORD Dwnewlong = GetWindowLong (hWnd, Gwl_exstyle);
Dwnewlong |= ws_ex_transparent | ws_ex_layered;
SetWindowLong (HWnd, Gwl_exstyle, Dwnewlong);

Of course, add some head files. # include <windows.h>
#pragma comment (lib, "User32.lib")

3. Set the screen windowstate to maximized, set the topmost of the screen to true, and then set the desired mask layer to the color of the form BackColor

How to WinForm in C + + when the form is full-screen and transparent but can make the keyboard mouse through, add a full screen mask