C# Signature:

[DllImport("user32.dll")]
static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint dwData,
   UIntPtr dwExtraInfo);

or

[DllImport("user32.dll")]
static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint dwData,
  int dwExtraInfo);

User-Defined Types:

  [Flags]
  public enum MouseEventTFlags
  {
    LEFTDOWN   = 0x00000002,
    LEFTUP     = 0x00000004,
    MIDDLEDOWN = 0x00000020,
    MIDDLEUP   = 0x00000040,
    MOVE       = 0x00000001,
    ABSOLUTE   = 0x00008000,
    RIGHTDOWN  = 0x00000008,
    RIGHTUP    = 0x00000010
  }

VB.Net Signature:

The declaration as originally posted is incorrect as mouse_event does not return a value. Also, for VB.NET, one should really use Int32 to ensure correct sizing.

Declare Auto Function mouse_event Lib "user32.dll" (ByVal dwflags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal dwData As Integer, ByVal dwExtraInfo As Integer) As Integer

Fixed declaration:

Declare Auto Sub mouse_event Lib "user32.dll" (ByVal dwFlags As Int32, ByVal dx As Int32, ByVal dy As Int32, ByVal cButtons As Int32, ByVal dwExtraInfo As Int32)

Notes:

I wanted to emulate the scroll. Searching for this information wasn't easy ... but here is how you do the mouse scroll button

dim ScrollValue as Integer

ScrollValue = 120 'or -120 for up or down scrolling

mouse_event(&H800, 0, 0, ScrollValue, 0)

FYI, Microsoft tells us for "Windows NT/2000/XP: This function has been superseded. Use SendInput instead."

Tips & Tricks:

Please add some!

Sample Code:

[DllImport("user32.dll")]
static extern bool SetCursorPos(int X, int Y);  

[DllImport("user32.dll")]
static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint dwData,  int dwExtraInfo);

[Flags]
  public enum MouseEventFlags
  {
    LEFTDOWN   = 0x00000002,
    LEFTUP     = 0x00000004,
    MIDDLEDOWN = 0x00000020,
    MIDDLEUP   = 0x00000040,
    MOVE       = 0x00000001,
    ABSOLUTE   = 0x00008000,
    RIGHTDOWN  = 0x00000008,
    RIGHTUP    = 0x00000010
  }
...
//Set cursor position  
SetCursorPos(10, 50);
//Mouse Right Down and Mouse Right Up
mouse_event((uint)MouseEventFlags.RIGHTDOWN,0,0,0,0);
mouse_event((uint)MouseEventFlags.RIGHTUP,0,0,0,0);    

Alternative Managed API:

Do you know one? Please contribute it!

You can use the System.Windows.Froms.Cursor.Position property to set the position of the mouse, if you would like.

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