AU3_WinGetHandle in C# Program

[DickWms]

I need help using AU3_WinGetHandle in a C# Program. My test program is shown below. It runs as expected with the last two lines commented out. But when the with AU3_WinGetHandle is active I get an error message saying "A problem caused the program to stop working correctly." and the only option is to close the program. I would appreciate if if someone points out my mistake.

Thank you - Dick Williams

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace TryAutoitDLL
{
public partial class Form1 : Form
{
[DllImport("AutoItX3.dll", SetLastError = true, CharSet = CharSet.Auto)]
static public extern int AU3_AutoItSetOption([MarshalAs(UnmanagedType.LPWStr)] string Option, int Value);

[DllImport("AutoItX3.dll", SetLastError = true, CharSet = CharSet.Auto)]
static public extern void AU3_WinActivate([MarshalAs(UnmanagedType.LPWStr)]string Title, [MarshalAs(UnmanagedType.LPWStr)]string Text);

[DllImport("AutoItX3.dll", SetLastError = true, CharSet = CharSet.Auto)]
static public extern void AU3_WinGetHandle([MarshalAs(UnmanagedType.LPWStr)]string Title, [MarshalAs(UnmanagedType.LPWStr)]string Text, [MarshalAs(UnmanagedType.LPWStr)]StringBuilder RetText, int BufSize);

[DllImport("AutoItX3.dll", SetLastError = true, CharSet = CharSet.Auto)]
static public extern int AU3_ControlSend([MarshalAs(UnmanagedType.LPWStr)] string Title, [MarshalAs(UnmanagedType.LPWStr)] string Text, [MarshalAs(UnmanagedType.LPWStr)] string Control, [MarshalAs(UnmanagedType.LPWStr)] string SendText, int Mode);

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
AU3_AutoItSetOption("WinTitleMatchMode", 2);
AU3_WinActivate("Notepad", "");
StringBuilder handle = new StringBuilder();

//AU3_WinGetHandle("Untitled - Notepad", "", handle, 200);
//int i = AU3_ControlSend("", "", handle.ToString(), "aaaa", 0);
}
}
}

[GideonM]

Are you aware that autoit uses the user32.dll? see http://stackoverflow.com/questions/3787057/need-to-activate-a-window

http://igify.com/?q=visual+c%23+activate+window+by+handle

[JohnOne]

Does AU3_WinGetHandle not take just two parameters?

[Richard Robertson]

Logically, it would have to take three. One for the input, and two describing the output buffer. First being the buffer and the second being the length.

[JohnOne]

I thought it just returned a string representation of the window handle, and only took title and text as parameters.

[Richard Robertson]

You can't return a string in C.That is just asking for trouble.

[JohnOne]

Just the help file is misleading.

[JohnOne]

Have not used AutoItx with C# for a long time, or C# for that matter.

But perhaps you might want to specify a size.

StringBuilder handle = new StringBuilder("",32);

[Richard Robertson]

It's actually just easier to pass a char[] and to make a string out of it just call new string(buffer).