C#调用APlayerCaller完成API创建，问题求助！|APlayer 讨论区 - APlayer 开发者论坛

//Form1.cs 部分代码
public delegate void fun3(int l1, int l2, int l3);//声明委托

       private void button1_Click(object sender, EventArgs e)
        {
           // new 方法并取地址，以下方同。
            fun3 DOnMessage = new fun3(OnMessage);
            POnMessage = Marshal.GetFunctionPointerForDelegate(DOnMessage);
            fun2 DOnStateChanged = new fun2(OnStateChanged);
            POnStateChanged = Marshal.GetFunctionPointerForDelegate(DOnStateChanged);
            fun0 DOnOpenSuccess = new fun0(OnOpenSuccess);
            POnOpenSuccess = Marshal.GetFunctionPointerForDelegate(DOnOpenSuccess);
            fun1 DOnSeekCompleted = new fun1(OnSeekCompleted);
            POnSeekCompleted = Marshal.GetFunctionPointerForDelegate(DOnSeekCompleted);
            fun1 DOnBuffer = new fun1(OnBuffer);
            POnBuffer = Marshal.GetFunctionPointerForDelegate(DOnBuffer);
            fun0 DOnVideoSizeChanged = new fun0(OnVideoSizeChanged);
            POnVideoSizeChanged = Marshal.GetFunctionPointerForDelegate(DOnVideoSizeChanged);
            funs1 DOnDownloadCodec = new funs1(OnDownloadCodec);
            POnDownloadCodec = Marshal.GetFunctionPointerForDelegate(DOnDownloadCodec);
            fun2 DOnEvent = new fun2(OnEvent);
            POnEvent = Marshal.GetFunctionPointerForDelegate(DOnEvent);


            //创建代码
            HAplayer = APlayer.APlayer.CreateAPlayer(panel1.Handle.ToInt32(), 50, 50, 200, 200, (long)POnMessage, (long)POnStateChanged, (long)POnOpenSuccess, (long)POnSeekCompleted, (long)POnBuffer, (long)POnVideoSizeChanged, (long)POnDownloadCodec, (long)POnEvent);
            MessageBox.Show("句柄是:" + HAplayer.ToString());
            //APlayer.APlayer.open(HAplayer, "F:\\视频\\C体.BD1280超清国英双语特效中英双字.mp4");
        }

//回调方法

void OnMessage(int l1, int l2, int l3)
        {
              //方法体
        }

// Aplayer.cs 部分代码
using System;
using System.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace APlayer
{
    public abstract class APlayer
    {

        [DllImportAttribute("APlayerCaller.dll", EntryPoint = "APlayer_Create")]
        public static extern int CreateAPlayer
        (
            long hParent,
            long x,
            long y,
            long nWidth,
            long nHeight,
            long OnMessage,
            long OnStateChanged,
            long OnOpenSuccess,
            long OnSeekCompleted,
            long OnBuffer,
            long OnVideoSizeChanged,
            long ondownloadcodec,
            long OnEvent
        );
    }
}