求教：C#调用C++写的DLL 关于 unsigned char*的声明问题

hfdsoft 2013-05-23 12:05:45

1、SDK.H 中有声明以下函数



//回调

typedef bool (CALLBACK *DataCallBack)(int index, int type, BYTE *pData, int len, int param1, int param2);

//设置回调

DLL_EXPORT int WAPA_IPC_SetDataCallBack(DataCallBack fData);

//连接摄像机	

DLL_EXPORT int WAPA_IPC_Login(char *sCameraIp, int dataFormat);	

//初始化解码器

DLL_EXPORT int WAPA_IPC_InitDec(int index, int width, int height, int encodeFormat, int dataFormat);

//解码

DLL_EXPORT int WAPA_IPC_Dec(int index, unsigned char *istream, int istream_size, unsigned char *ostream);

//拍照并保存

DLL_EXPORT int WAPA_IPC_OnPhoto(int index, unsigned char* pImageBuf, int width, int height, int dataFormat, char* fileName = NULL);

2、我在C#中声明如下



publlic class WAPAMethods

{

		//回调

		public unsafe delegate bool DataCallBack(int index, int mode, byte* data, int len, int w, int h);

        /// <summary>

        /// 设置事件回调函数

        /// </summary>

        /// <param name="fEvent"></param>

        /// <returns></returns>

        [DllImport(WAPA_DLL, EntryPoint = "WAPA_IPC_SetEventCallBack", CallingConvention = CallingConvention.Cdecl)]

        public static extern int WAPA_IPC_SetEventCallBack(EventCallBack fEvent);

        /// <summary>

        /// 连接到录像机

        /// </summary>

        /// <param name="sCameraIp">IP地址</param>

        /// <param name="dataFormat">0：解码前数据；1：YUYV格式数据；2：RGB格式数据</param>

        /// <returns></returns>

        [DllImport(WAPA_DLL, EntryPoint = "WAPA_IPC_Login", CallingConvention = CallingConvention.Cdecl)]

        public static extern int WAPA_IPC_Login(string sCameraIp, int dataFormat);

        /// <summary>

        /// 初始化解码器

        /// </summary>

        /// <param name="index"></param>

        /// <param name="width">图像宽</param>

        /// <param name="height">图像高</param>

        /// <param name="encodeFormat">压缩数据格式 264：H.264；265：MPEG4</param>

        /// <param name="dataFormat">输出的数据格式 1：YUYV；2：RGB</param>

        /// <returns></returns>

        [DllImport(WAPA_DLL, EntryPoint = "WAPA_IPC_InitDec", CallingConvention = CallingConvention.Cdecl)]

        public static extern int WAPA_IPC_InitDec(int index, int width, int height, int encodeFormat, int dataFormat);

        /// <summary>

        /// 解码

        /// </summary>

        /// <param name="index">解码器索引号</param>

        /// <param name="istream">编码数据</param>

        /// <param name="istream_size">编码的数据大小</param>

        /// <param name="ostream">解码后的数据</param>

        /// <returns></returns>

        [DllImport(WAPA_DLL, EntryPoint = "WAPA_IPC_Dec", CallingConvention = CallingConvention.Cdecl)]

        //DLL_EXPORT int WAPA_IPC_Dec(int index, unsigned char *istream, int istream_size, unsigned char *ostream);

        public static extern unsafe int WAPA_IPC_Dec(int index, byte* istream, int istream_size, byte* ostream);

        //拍照. pImageBuf:返回的数据. dataFormat:YUYV,RGB

        [DllImport(WAPA_DLL, EntryPoint = "WAPA_IPC_OnPhoto", CallingConvention = CallingConvention.Cdecl)]

        public static extern unsafe int WAPA_IPC_OnPhoto(int index,byte* pImageBuf, int width, int height, int dataFormat, string fileName = null);



}

3、在Winform中调用



public partial class Form1 : Form

{

        private WAPAMethods.DataCallBack _dataCallBack;

        private unsafe byte* frameBuf;

        private unsafe void Form1_Load(object sender, EventArgs e)

        {

            _dataCallBack = DataOnReceived;

            WAPAMethods.WAPA_IPC_SetDataCallBack(_dataCallBack);

            Reconnected();

        }

        public void Reconnected()

        {

            //连接摄像机

            _cameraIndex = WAPAMethods.WAPA_IPC_Login(_ip,2);

            if(_cameraIndex==206)return;

            //连接成功后初始化解码器

            WAPAMethods.WAPA_IPC_InitDec(_cameraIndex, 1280, 960, 264, 2);

        }

        private unsafe bool DataOnReceived(int index, int mode, byte* data, int len, int w, int h)

        {

            //解码

            var ret = WAPAMethods.WAPA_IPC_Dec(index,data, len, frameBuf);

            //拍照

            ret = WAPAMethods.WAPA_IPC_OnPhoto(index, frameBuf, w, h, 2, null);

            return true;

        }

}