[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
Callback EnumWindowsProc should return true to continue enumerating or false to stop.
The corresponding unmanaged return type is a 4-byte Win32 'BOOL', so mark the method with the MarshalAsAttribute(UnmanagedType.Bool).
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);
}
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