Automating programs using C#

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace _141784_automating_programs_using_C_Sharp
{
class Program
{
const string AVIReCompPath = @"C:\Program Files (x86)\AVI ReComp\AVIReComp.exe";
const int BN_CLICKED = 0;
const string AVIReCompClassName = "TMain_Form";

[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);

delegate bool EnumWindowsCB(int hwnd, int lparam);

[DllImport("user32")]
static extern int EnumWindows(EnumWindowsCB cb, int lparam);

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern int GetWindowThreadProcessId(int handle, out int processId);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int GetClassName(int hWnd, StringBuilder lpClassName, int nMaxCount);

static int lid = 0;

static void Main(string[] args)
{
System.Diagnostics.Process AVIReComp = new System.Diagnostics.Process();
AVIReComp.StartInfo.FileName = AVIReCompPath;
AVIReComp.Start();
AVIReComp.WaitForInputIdle();
Thread.Sleep(250);
Console.WriteLine("AVIReComp.Id: {0:X}", AVIReComp.Id);
EnumWindowsCB cb = new EnumWindowsCB(MyEWP);
EnumWindows(cb, AVIReComp.Id);
}

public static string GetWindowClassName(int hWnd)
{
StringBuilder buffer = new StringBuilder(128);
GetClassName(hWnd, buffer, buffer.Capacity);
return buffer.ToString();
}

public static bool MyEWP(int hwnd, int lparam)
{
int processId;
GetWindowThreadProcessId(hwnd, out processId);
if (processId == lid)
return true;
lid = processId;
if (processId != lparam)
return true;
string ClassName = GetWindowClassName(hwnd);
if (ClassName != AVIReCompClassName)
return true;
Console.WriteLine("Found {0:X} {1}", hwnd, ClassName);
// int lviCount = (int)SendMessage(hListView, LVM_GETITEMCOUNT, 0, IntPtr.Zero); // get number of items in ListView
return true;
}
}
}