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EnumWindows (user32)
 
.
Summary

C# Signature:

[DllImport("user32.dll")]
static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

User-Defined Types:

EnumWindowsProc

Notes:

Callback EnumWindowsProc should return true to continue enumerating or false to stop.

Tips & Tricks:

Please add some!

SAMPLE CODE!!

using System.Runtime.InteropServices;

public delegate bool CallBackPtr(int hwnd, int lParam);

public class EnumReport
{

[DllImport("user32.dll")]
public static extern int EnumWindows(CallBackPtr callPtr, int lPar);

public static bool Report(int hwnd, int lParam)
    {
        Console.WriteLine("Window handle is "+hwnd);
        return true;
    }
}
void Main()
{
CallBackPtr callBackPtr = new CallBackPtr(EnumReport.Report);
EnumReport.EnumWindows(callBackPtr, 0);
}

Alternative Managed API:

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Documentation
EnumWindows on MSDN

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