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POGet Text From Specific Textboxes From External Application - Visual Basic .Net
 

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  1. POGet Text From Specific Textboxes From External Application - Visual Basic .Net
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    <p>I can get text from external application text box but now I want to get text from my desired text box from external application. My English is not so good that's why see Image Below.</p> <p><img src="https://i.stack.imgur.com/U5aNi.jpg" alt="enter image description here"></p> <p>The Below Code Return The First Text Box Value Only.</p> <pre><code>Imports System.Runtime.InteropServices Public Class Form1 Private Const WM_GETTEXT As Integer = &amp;HD Declare Auto Function SendMessage Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal msg As Integer, _ ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr &lt;DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)&gt; _ Private Shared Function FindWindowEx(ByVal parentHandle As IntPtr, _ ByVal childAfter As IntPtr, _ ByVal lclassName As String, _ ByVal windowTitle As String) As IntPtr End Function Declare Auto Function FindWindow Lib "user32.dll" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 'Find the running notepad window Dim Hwnd As IntPtr = FindWindow(Nothing, TextBox1.Text) 'Alloc memory for the buffer that recieves the text Dim Handle As IntPtr = Marshal.AllocHGlobal(100) 'send WM_GWTTEXT message to the notepad window Dim NumText As Integer = SendMessage(Hwnd, WM_GETTEXT, 50, Handle) 'copy the characters from the unmanaged memory to a managed string Dim Text As String = Marshal.PtrToStringUni(Handle) 'Display the string using a label Label1.Text = Text 'Find the Edit control of the Running Notepad Dim ChildHandle As IntPtr = FindWindowEx(Hwnd, IntPtr.Zero, "Edit", Nothing) 'Alloc memory for the buffer that recieves the text Dim Hndl As IntPtr = Marshal.AllocHGlobal(200) 'Send The WM_GETTEXT Message NumText = SendMessage(ChildHandle, WM_GETTEXT, 200, Hndl) 'copy the characters from the unmanaged memory to a managed string Text = Marshal.PtrToStringUni(Hndl) 'Display the string using a label Label2.Text = Text End Sub End Class </code></pre>
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    1. USMuhammad Saqib
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    1. COOn a side note - you should make sure you call [Marshal.FreeHGlobal](http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.freehglobal.aspx) with your `Handle` and `Hndl` variables to free the memory you've allocated. This memory isn't allocated using standard .NET mechanisms, so .NET's garbage collection won't clean it up for you.
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      1. POGet Text From Specific Textboxes From External Application - Visual Basic .Net
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    2. COYou may want to check this post: [Extract all child windows of window](http://stackoverflow.com/questions/13345267/extract-all-child-windows-of-window/14408950#14408950). There I include a sample VB.NET program that can detect and read the text (among other things) of every single window.
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