C # control mouse actions

You can use two functions to operate the mouse:

        [DllImport("user32.dll")]           static extern bool SetCursorPos(int X, int Y);           [DllImport("user32.dll")]           static extern void mouse_event(MouseEventFlag flags, int dx, int dy, uint data, UIntPtr extraInfo);           [Flags]           enum MouseEventFlag : uint          {               Move = 0x0001,               LeftDown = 0x0002,               LeftUp = 0x0004,               RightDown = 0x0008,               RightUp = 0x0010,               MiddleDown = 0x0020,               MiddleUp = 0x0040,               XDown = 0x0080,               XUp = 0x0100,               Wheel = 0x0800,               VirtualDesk = 0x4000,               Absolute = 0x8000           }  

SetCursorPos allows the mouse to Move to the specified position. mouse_event uses the Move in the MouseEventFlag enumeration to Move the mouse.

Different enumerated values can be used in mouse_event to simulate different mouse events.

Note the following points:

1. we cannot use mouse_event (MouseEventFlag. leftDown, 10, 10, 0, UIntPtr. zero); to simulate the left-click event at (10, 10), we need to split this step into two steps:

Step 1: Move the mouse to (10, 10) and use SetCursorPos (10, 10 );

Step 2: trigger the left button and use mouse_event (MouseEventFlag. LeftDown, 0, 0, 0, UIntPtr. Zero );

Essentially a two-step event, the window API cannot be too intelligent to think that it will automatically run to (10, 10), and then left-click

2. The enumerated values of MouseEventFlag can be used together. | Operator is used.

By clicking the left mouse button and releasing the combination of the two events, you can click:
Mouse_event (MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0)

Two consecutive left-click events constitute a double-click event:
Mouse_event (MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0)
Mouse_event (MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0)

3. There is an Absolute enumeration in the MouseEventFlag. If no Absolute is specified, the operation of mouse_event is relative to the position of the last mouse; if Absolute is specified, it is relative to the whole screen coordinate.

Note that if you specify Absolute, the coordinates of the mouse are constrained between [0, 65535. 0 corresponds to the left of the screen, and 65535 corresponds to the bottom right corner of the screen.

The original MSDN statement is as follows:

If MOUSEEVENTF_ABSOLUTE value is specified,DxAndDyContain normalized absolute coordinates between 0 and 65,535. the event procedure maps these coordinates onto the display surface. coordinate (0, 0) maps onto the upper-left corner of the display surface, (65535,65535) maps onto the lower-right corner.

So the simulated left button at (10, 10) should be changed:

Mouse_event (MOUSEEVENTF_LEFTDOWN, 10*65536/Screen. PrimaryScreen. Bounds. Width, 10*65536/Screen. PrimaryScreen. Bounds. Height, 0, 0 );

If you want to use mouse_event on the second Screen, you cannot use Screen. PrimaryScreen.