调用 player_open 的时候，提示托管的签名与非托管的目标签名不匹配

[mokongh]

作者好，我的C#程序在调用 player_open 的时候弹出了异常，但我不清楚这个异常是由什么导致的，能不能帮忙分析下原因？

private void OpenPlayer()
{
    IntPtr hwnd = this.Panel1.Handle;

    PlayerSDK.PLAYER_INIT_PARAMS di = new PlayerSDK.PLAYER_INIT_PARAMS();
    di.audio_bufpktn = 10;
    di.video_bufpktn = 10;
    di.init_timeout = 2000;
    di.auto_reconnect = 2000;
    di.rtsp_transport = 0;
    di.video_thread_count = 1;
    di.vdev_render_type = 1;
    di.video_hwaccel = 1;
    GCHandle C_di = GCHandle.Alloc(di, GCHandleType.Pinned);

    // 运行到此处会弹出异常
    mPlayer = PlayerSDK.player_open(playurl, hwnd, C_di.AddrOfPinnedObject());

    PlayerSDK.player_play(mPlayer);

    C_di.Free();
}

// PlayerSDK 的函数定义
public class PlayerSDK
{
    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_open")]
    public static extern IntPtr player_open(string file, IntPtr hwnd, IntPtr configs);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_close")]
    public static extern void player_close(IntPtr player);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_play")]
    public static extern void player_play(IntPtr player);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_pause")]
    public static extern void player_pause(IntPtr player);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_seek")]
    public static extern void player_seek(IntPtr player, long ms);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_setrect")]
    public static extern void player_setrect(IntPtr player, int type, int x, int y, int w, int h);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_snapshot")]
    public static extern int player_snapshot(IntPtr player, string file, int w, int h, int wait);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_setparam")]
    public static extern void player_setparam(IntPtr player, uint id, IntPtr param);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_setparam")]
    public static extern void player_setparam(IntPtr player, uint id, ref int param);

    [DllImport(@"playerdll\fanplayer.dll", EntryPoint = "player_getparam")]
    public static extern void player_getparam(IntPtr player, uint id, ref long param);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct PLAYER_INIT_PARAMS
    {
        public int video_vwidth;             
        public int video_vheight;            
        public int video_owidth;             
        public int video_oheight;            
        public int video_frame_rate;         
        public int video_stream_total;       
        public int video_stream_cur;         
        public int video_thread_count;       
        public int video_hwaccel;            
        public int video_deinterlace;        
        public int video_rotate;             
        public int video_codecid;            
        public int video_bufpktn;            
        public int audio_channels;           
        public int audio_sample_rate;        
        public int audio_stream_total;       
        public int audio_stream_cur;         
        public int audio_bufpktn;            
        public int subtitle_stream_total;    
        public int subtitle_stream_cur;      
        public int vdev_render_type;         
        public int adev_render_type;         
        public int init_timeout;             
        public int open_syncmode;            
        public int auto_reconnect;           
        public int rtsp_transport;           
        public int avts_syncmode;            
        public char filter_string;      
        public char ffrdp_tx_key;       
        public char ffrdp_rx_key;       
    }
}

[mokongh]

添加了 CallingConvention = CallingConvention.Cdecl 后没有报错了