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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. Plus, dwExtraInfo appears to be a ULONG_PTR in C++ (IntPtr in VB.NET)
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 IntPtr)
Notes:
I wanted to emulate the scroll. Searching for this information wasn't easy ... but here is how you do the mouse scroll button
This code assumes a form called frmMain with a command button called cmdClick a picture box called picClicker and a text box called txtResults
Note Twips are no more. Also, I stripped the FOR loop of delta moves from the command button click to the middle of the picture box.
Option Explicit On
Friend Class frmMain
Inherits System.Windows.Forms.Form
Declare Auto Sub mouse_event Lib "user32" (ByVal dwFlags As Int32, ByVal dx As Int32, ByVal dy As Int32, ByVal cButtons As Int32, ByVal dwExtraInfo As IntPtr)
Const MOUSEEVENTF_MOVE As Int32 = &H1 ' mouse move
Const MOUSEEVENTF_LEFTDOWN As Int32 = &H2 ' left button down
Const MOUSEEVENTF_LEFTUP As Int32 = &H4 ' left button up
Const MOUSEEVENTF_RIGHTDOWN As Int32 = &H8 ' right button down
Const MOUSEEVENTF_RIGHTUP As Int32 = &H10 ' right button up
Const MOUSEEVENTF_MIDDLEDOWN As Int32 = &H20 ' middle button down
Const MOUSEEVENTF_MIDDLEUP As Int32 = &H40 ' middle button up
Const MOUSEEVENTF_ABSOLUTE As Int32 = &H8000 ' absolute move
Const MOUSEEVENTF_WHEEL As Int32 = &H800 ' wheel button rolled
' Simulate moving the mouse to the center of the
' PictureBox and clicking.
Private Sub cmdClick_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles cmdClick.Click
Dim cur_x As Single
Dim cur_y As Single
Dim dest_x As Single
Dim dest_y As Single
' 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.
' Get the current mouse coordinates and convert
' them into this new system.
cur_x = System.Windows.Forms.Cursor.Position.X * 65535 / System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width
cur_y = System.Windows.Forms.Cursor.Position.Y * 65535 / System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height
' Convert the coordinates of the center of the
' picClicker PictureBox into this new system.
Dim pt As Point = picClicker.PointToScreen(New Point(picClicker.ClientRectangle.Width / 2, picClicker.ClientRectangle.Height / 2))
' Move the mouse to its final destination and click it.
mouse_event(MOUSEEVENTF_ABSOLUTE + MOUSEEVENTF_MOVE + MOUSEEVENTF_LEFTDOWN + MOUSEEVENTF_LEFTUP, dest_x, dest_y, 0, 0)
End Sub
Private Sub picClicker_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles picClicker.Click
txtResults.Text = txtResults.Text & "MouseClick" & vbCrLf
End Sub
Private Sub picClicker_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles picClicker.MouseDown
txtResults.Text = txtResults.Text & "MouseDown (" & e.X & ", " & e.Y & ")" & vbCrLf
End Sub
Private Sub picClicker_MouseUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles picClicker.MouseUp
txtResults.Text = txtResults.Text & "MouseUp (" & e.X & ", " & e.Y & ")" & vbCrLf
End Sub
End Class
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.
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
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