Title: Simulate mouse movement and clicks in C#
This program uses the mouse_event API function to simulate mouse movement and to simulate a mouse click.
The program's Paint event handler draws some circles around a target point so you can see where it is.
// The mouse's target location.
private Point m_Target = new Point(200, 150);
// Draw a target.
private void Form1_Paint(object sender, PaintEventArgs e)
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
for (int i = 5; i <= 20; i += 5)
m_Target.X - i - 1, m_Target.Y - i - 1, 2 * i, 2 * i);
When you click the mouse on the form, the following code draws an X where you clicked.
// Draw an X where the user clicked.
private void Form1_Click(object sender, EventArgs e)
// Get the mouse position.
Point pt = MousePosition;
// Convert to screen coordinates.
pt = this.PointToClient(pt);
using (Graphics gr = this.CreateGraphics())
gr.SmoothingMode = SmoothingMode.AntiAlias;
pt.X - 5, pt.Y - 5, pt.X + 5, pt.Y + 5);
pt.X + 5, pt.Y - 5, pt.X - 5, pt.Y + 5);
When you click the Move & Click button, the program executes the following code.
// Move the mouse and click it.
private void btnMoveClick_Click(object sender, EventArgs e)
// Convert the target to absolute screen coordinates.
Point pt = this.PointToScreen(m_Target);
// mouse_event moves in a coordinate system where
// (0, 0) is in the upper left corner and
// (65535,65535) is in the lower right corner.
// Convert the coordinates.
Rectangle screen_bounds = Screen.GetBounds(pt);
uint x = (uint)(pt.X * 65535 / screen_bounds.Width);
uint y = (uint)(pt.Y * 65535 / screen_bounds.Height);
// Move the mouse.
(uint)(MouseEventFlags.ABSOLUTE | MouseEventFlags.MOVE),
x, y, 0, 0);
// Click there.
(uint)(MouseEventFlags.ABSOLUTE | MouseEventFlags.MOVE |
MouseEventFlags.LEFTDOWN | MouseEventFlags.LEFTUP),
x, y, 0, 0);
The code first converts the target point's coordinates from form coordinates to screen coordinates. It then converts the result into the mouse's special coordinate system that runs from 0 to 65535 in the X and Y directions.
Next the program uses the mouse_event API function to move the mouse to the target position and to click the mouse. Because this simulates a normal mouse click event, the form's Click event handler executes and draws an X at the target point.
See the code to learn how the mouse_event API function is declared and how the MouseEventFlags enumeration is defined.
Download the example to experiment with it and to see additional details.