How can i programmatically click a external Application Using VB.net - vb.net

Question

I have created a test software to test our product, but in some cases other customer provide there API/Tool and etc... to test there specific parameter.
I want is to click the button on other the application (Automatically Click).
Basically we want it so the operator will not click the wrong button even there have a work instruction.

Answer 1

Try this:
Private Const BM_CLICK = &HF5
Private Declare Auto Function FindWindow Lib "user32.dll" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As IntPtr
Private Declare Auto Function FindWindowEx Lib "user32.dll" (ByVal hwndParent As IntPtr, ByVal hwndChildAfter As IntPtr, ByVal lpszClass As String, ByVal lpszWindow As String) As IntPtr
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim hWndMsgBox, hWndButton As Long
hWndMsgBox = FindWindow("#32770", "About")
If hWndMsgBox Then hWndButton = FindWindowEx(hWndMsgBox, 0&, "Button", "OK")
If hWndButton Then SendMessage(hWndButton, BM_CLICK, 0&, 0&)
End Sub

Answer 2

'------------------------------FORM-----------------------------------------------
Public Class Form1
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
LeftClick()
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If CommandType.Text = "Start" Then
Timer1.Enabled = True
CommandType.Text = "Stop"
Else
Timer1.Enabled = False
CommandType.Text = "Start"
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
MoveMouse(300, 75)
LeftClick()
LeftClick()
End Sub
End Class
'------------------------------MODULE----------------------------------------------
Module Module1
Public Declare Sub mouse_event Lib "user32" (ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal cButtons As Integer, ByVal dwExtraInfo As Integer)
Public Declare Function SetCursorPos Lib "user32" (ByVal x As Integer, ByVal y As Integer) As Integer
Public Declare Function GetCursorPos Lib "user32" (ByVal lpPoint As POINTAPI) As Integer
Public Const MOUSEEVENTF_LEFTDOWN = &H2
Public Const MOUSEEVENTF_LEFTUP = &H4
Public Const MOUSEEVENTF_MIDDLEDOWN = &H20
Public Const MOUSEEVENTF_MIDDLEUP = &H40
Public Const MOUSEEVENTF_RIGHTDOWN = &H8
Public Const MOUSEEVENTF_RIGHTUP = &H10
Public Const MOUSEEVENTF_MOVE = &H1
Public Structure POINTAPI
Dim x As Integer
Dim y As Integer
End Structure
Public Function GetX() As Integer
: Dim n As POINTAPI
GetCursorPos(n)
GetX = n.x
End Function
Public Function GetY() As Integer
Dim n As POINTAPI
GetCursorPos(n)
GetY = n.y
End Function
Public Sub LeftClick()
LeftDown()
LeftUp()
End Sub
Public Sub LeftDown()
mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0)
End Sub
Public Sub LeftUp()
mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0)
End Sub
Public Sub MiddleClick()
MiddleDown()
MiddleUp()
End Sub
Public Sub MiddleDown()
mouse_event(MOUSEEVENTF_MIDDLEDOWN, 0, 0, 0, 0)
End Sub
Public Sub MiddleUp()
mouse_event(MOUSEEVENTF_MIDDLEUP, 0, 0, 0, 0)
End Sub
Public Sub RightClick()
RightDown()
RightUp()
End Sub
Public Sub RightDown()
mouse_event(MOUSEEVENTF_RIGHTDOWN, 0, 0, 0, 0)
End Sub
Public Sub RightUp()
mouse_event(MOUSEEVENTF_RIGHTUP, 0, 0, 0, 0)
End Sub
Public Sub MoveMouse(ByVal xMove As Integer, ByVal yMove As Integer)
mouse_event(MOUSEEVENTF_MOVE, xMove, yMove, 0, 0)
End Sub
Public Sub SetMousePos(ByVal xPos As Integer, ByVal yPos As Integer)
SetCursorPos(xPos, yPos)
End Sub
End Module
This will allow you to Left click, Right click and move cursor base on X and Y Axis.