GetMonitorInfo C# 调用问题

[beatleslp]

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    static class Program
    {
        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
        private static extern int EnumDisplayMonitors(int hdc, int lprcClip, deleMonitorEnumProc lpfnEnum, int dwData);

        private delegate int deleMonitorEnumProc(int hMonitor, int hdcMonitor, RECT lprcMonitor, int dwData);

        [DllImport("user32.dll", EntryPoint = "GetMonitorInfoA", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
        private static extern bool GetMonitorInfo(int hMonitor, MONITORINFOEX lpmi);
        private struct RECT
        {
            public int Left_Renamed;
            public int Top;
            public int Right_Renamed;
            public int Bottom;
        }
        private struct MONITORINFOEX
        {
            public int cbSize;
            public RECT rcMonitor;
            public RECT rcWork;
            public int dwFlags;
            public string szDevice;
        }

        public static string aa = null;

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
        public  static void test(){

           EnumDisplayMonitors(0, 0, new deleMonitorEnumProc(MonitorEnumProc), 0);
        }

        private static int MonitorEnumProc(int hMonitor, int hdcMonitor, RECT lprcMonitor, int dwData)
        {
                MONITORINFOEX udtMonInf = new MONITORINFOEX();
                udtMonInf.cbSize =72;

          if (GetMonitorInfo(hMonitor,  udtMonInf))
            {

            }
            else
            {
            }

            return 1;
        }
        
    }
}

执行到 if (GetMonitorInfo(hMonitor, udtMonInf))
时出System.AccessViolationException异常 请大家帮看看 结构体参数问题？？

[三岁、就很帅]

[beatleslp]

= =讨厌

[beatleslp]

private static extern bool GetMonitorInfo(int hMonitor, out MONITORINFOEX lpmi);

参数改成OUT不出异常了 但是返回值为 FALSE。。。。。。额额额

[beatleslp]

额 弄好了 private struct MONITORINFOEX
{
public int cbSize;
public RECT rcMonitor;
public RECT rcWork;
public int dwFlags;
//public string szDevice;
}

最后一个参数多余