Enumerate Display Monitors : Native Windows Function « Windows « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows
3. Native Windows Function

/*
NET Development for Java Programmers
# By Paul Gibbons
# ISBN: 1-59059-038-4
# 432 pp.
# Published: Jul 2002
*/

 

using System;
using System.Runtime.InteropServices;

[ StructLayout( LayoutKind.Sequential ) ]
struct Rect
{
  public int left;
  public int top;
  public int right;
  public int bottom;
}

[ StructLayout( LayoutKind.Sequential ) ]
struct MonitorInfo
{
  public uint size;
  public Rect monitor;
  public Rect work;
  public uint flags;
}

class MainClass
{
  delegate bool MonitorEnumDelegate( IntPtr hMonitor,IntPtr hdcMonitor,ref Rect lprcMonitor, IntPtr dwData );

  [ DllImport( "user32.dll" ) ]
  static extern bool EnumDisplayMonitors( IntPtr hdc, IntPtr lprcClip, MonitorEnumDelegate lpfnEnum, IntPtr dwData );

  [ DllImport( "user32.dll" ) ]
  static extern bool GetMonitorInfo( IntPtr hmon, ref MonitorInfo mi );
  static bool MonitorEnum( IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor,  IntPtr dwData )
  {
    MonitorInfo mi = new MonitorInfo();
    mi.size = (uint)Marshal.SizeOf( mi );
    bool success = GetMonitorInfo( hMonitor, ref mi );

    return true;
  }

  [STAThread]
  static void Main(string[] args)
  {
    MonitorEnumDelegate med = new MonitorEnumDelegate( MonitorEnum );
    EnumDisplayMonitors( IntPtr.Zero, IntPtr.Zero, med, IntPtr.Zero );
  }
}