C#调用C++写的dll问题
有个C++写的视频服务器的SDK，需要在C#下调用，但是改来改去总是有问题，无法正确采集图像，请大虾们指点一二，谢谢！类型转换上面不知道是不是有问题，但是如果一开始调用初始化函数的时候就会报“尝试读取或写入受保护的内存...”，如果不调用初始化函数，则不报错，但是图像仍然不显示。
需要调用的C++代码
/// 设备信息typedef struct _H264_DVR_DEVICEINFO{ char sSoftWareVersion[64]; ///< 软件版本信息 char sHardWareVersion[64]; ///< 硬件版本信息 char sEncryptVersion[64]; ///< 加密版本信息 SDK_SYSTEM_TIME tmBuildTime;///< 软件创建时间 char sSerialNumber[64]; ///< 设备序列号 int byChanNum; ///< 视频输入通道数 int iVideoOutChannel; ///< 视频输出通道数 int byAlarmInPortNum; ///< 报警输入通道数 int byAlarmOutPortNum; ///< 报警输出通道数 int iTalkInChannel; ///< 对讲输入通道数 int iTalkOutChannel; ///< 对讲输出通道数 int iExtraChannel; ///< 扩展通道数 int iAudioInChannel; ///< 音频输入通道数 int iCombineSwitch; ///< 组合编码通道分割模式是否支持切换 int iDigChannel; ///<数字通道数 unsigned int uiDeviceRunTime; ///<系统运行时间}H264_DVR_DEVICEINFO,*LPH264_DVR_DEVICEINFO;typedef struct H264_DVR_CLIENTINFO{ int nChannel; //通道号 int nStream; //0表示主码流，为1表示子码流 int nMode; //0：TCP方式,1：UDP方式,2：多播方式,3 - RTP方式，4-音视频分开(TCP) int nComType; //只对组合编码通道有效, 组合编码通道的拼图模式 void* hWnd; H264_DVR_CLIENTINFO() { hWnd=0; } }*LPH264_DVR_CLIENTINFO;//服务器断开回调原形typedef void (CALL_METHOD *fDisConnect)(long lLoginID, char *pchDVRIP, long nDVRPort, unsigned long dwUser);//*** */SDK初始化H264_DVR_API long CALL_METHOD H264_DVR_Init(fDisConnect cbDisConnect, unsigned long dwUser);//打开实时预览H264_DVR_API long CALL_METHOD H264_DVR_RealPlay(long lLoginID, LPH264_DVR_CLIENTINFO lpClientInfo); /// <summary> /// 设备信息 /// H264_DVR_DEVICEINFO,*LPH264_DVR_DEVICEINFO; /// </summary> public struct H264_DVR_DEVICEINFO { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public byte[] sSoftWareVersion; ///< 软件版本信息 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public byte[] sHardWareVersion; ///< 硬件版本信息 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public byte[] sEncryptVersion; ///< 加密版本信息 public SDK_SYSTEM_TIME tmBuildTime;///< 软件创建时间 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public byte[] sSerialNumber; ///< 设备序列号 public Int32 byChanNum; ///< 视频输入通道数 public Int32 iVideoOutChannel; ///< 视频输出通道数 public Int32 byAlarmInPortNum; ///< 报警输入通道数 public Int32 byAlarmOutPortNum; ///< 报警输出通道数 public Int32 iTalkInChannel; ///< 对讲输入通道数 public Int32 iTalkOutChannel; ///< 对讲输出通道数 public Int32 iExtraChannel; ///< 扩展通道数 public Int32 iAudioInChannel; ///< 音频输入通道数 public Int32 iCombineSwitch; ///< 组合编码通道分割模式是否支持切换 public Int32 iDigChannel; ///<数字通道数 public Int32 uiDeviceRunTime; ///<系统运行时间 } /// <summary> /// *LPH264_DVR_CLIENTINFO; /// </summary> public struct H264_DVR_CLIENTINFO { /// <summary> /// //通道号 /// </summary> public int nChannel; /// <summary> /// //0表示主码流，为1表示子码流 /// </summary> public int nStream; /// <summary> /// //0：TCP方式,1：UDP方式,2：多播方式,3 - RTP方式，4-音视频分开(TCP) /// </summary> public int nMode; /// <summary> /// //只对组合编码通道有效, 组合编码通道的拼图模式 /// </summary> public int nComType; public IntPtr hWnd; //H264_DVR_CLIENTINFO(IntPtr hWnd) //{ // hWnd = IntPtr.Zero; //} } /// <summary> /////服务器断开回调原形 /// typedef void (CALL_METHOD *fDisConnect)(long lLoginID, char *pchDVRIP, long nDVRPort, unsigned long dwUser); /// </summary> public delegate void fDisConnect(int lLoginID, string pchDVRIP, int nDVRPort, uint dwUser); /// <summary> /////*** */SDK初始化 /// H264_DVR_API long CALL_METHOD H264_DVR_Init(fDisConnect cbDisConnect, unsigned long dwUser); /// </summary> [DllImport("netsdk.dll")] public static extern int H264_DVR_Init(fDisConnect cbDisConnect, uint dwUser); /// <summary> /////获取错误信息 /// H264_DVR_API long CALL_METHOD H264_DVR_GetLastError(); /// </summary> [DllImport("netsdk.dll")] public static extern int H264_DVR_GetLastError(); /// <summary> ///向设备注册 ///H264_DVR_API long CALL_METHOD H264_DVR_Login(char *sDVRIP, unsigned short wDVRPort, char *sUserName, char *sPassword,LPH264_DVR_DEVICEINFO lpDeviceInfo, int *error); /// </summary> [DllImport("netsdk.dll")] public static extern int H264_DVR_Login(string sDVRIP, ushort wDVRPort, string sUserName, string sPassword, ref H264_DVR_DEVICEINFO lpDeviceInfo, IntPtr error); /// <summary> ///打开实时预览 ///H264_DVR_API long CALL_METHOD H264_DVR_RealPlay(long lLoginID, LPH264_DVR_CLIENTINFO lpClientInfo); /// </summary> [DllImport("netsdk.dll")] public static extern int H264_DVR_RealPlay(int lLoginID, ref H264_DVR_CLIENTINFO lpClientInfo);