C# 如何调用 C++ DLL中的函数接口和回调函数

1、C#中大部分基本数据类型都和C++的基本数据类型相同，因此基本数据类型的转换比较简单，需要注意的就是字节大小。 2、C++数组和C#的数组转换需要注意的就是需要注意，需要增加声明如[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]才能定义一个C++中的数组元素为10个的数组。 3、 C++的回调函数接口需要采用C#中的委托函数方法，C++的中回调函数设置中，一般使用的是地址值，因此需要C#中显示采用托管函数。 4、C++的指针数组，可用C#中的IntPtr ;如果只是地址指针，则C#中引用类型即可。类型前加ref

举例说明： using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices;

namespace IPNBSVTD_CSharp { public delegate void StatusCallBack(IntPtr dwInstance, IntPtr wParam, IntPtr lParam); public delegate void VoiceCallBack(IntPtr dwInstance, byte ucDeviceIndex, IntPtr pInDataBuf, ref int pInDataLen, IntPtr pOutDataBuf, int nOutDataLen);

public enum VT_MESSAGE{    VT_MESSAGE_SET_DEVICE_INFO,    VT_MESSAGE_UPDATE_DEVICE_INFO,    VT_MESSAGE_UPDATE_MIXER_IN_CTRL,    VT_MESSAGE_UPDATE_MIXER_OUT_CTRL,    VT_MESSAGE_MISSED_CALLS,                // 未接来电};public enum VT_TASK_TYPE //终端状态{    VT_TASK_TYPE_NULL,                //空闲(无任务)    VT_TASK_TYPE_TO_MONITOR,        //发起监听    VT_TASK_TYPE_BY_MONITOR,        //被监听    VT_TASK_TYPE_TO_BROADCAST,        //发起采播    VT_TASK_TYPE_BY_BROADCAST,        //接收采播    VT_TASK_TYPE_TO_TALK,            //发起对讲    VT_TASK_TYPE_BY_TALK,            //接收对讲    VT_TASK_TYPE_MULTITALK,            //多方通话    VT_TASK_TYPE_OFFLINETALK,       //离线对讲};public enum VT_TASK_STATE //终端任务状态        {    VT_TASK_STATE_NULL,                // 无任务    VT_TASK_STATE_STOP,                // 监听停止,对讲停止,广播停止    VT_TASK_STATE_CONNECTING,        // 监听:连接中    VT_TASK_STATE_CALLING,            // 对讲:呼叫中    VT_TASK_STATE_BEGIN_BC_PROMPT,    // 广播:开始提示音    VT_TASK_STATE_END_BC_PROMPT,    // 广播:结束提示音    VT_TASK_STATE_ONGOING,            // 监听中,对讲中,广播中};public enum VT_TARGET_STATE // 目标状态{    VT_TARGET_STATE_NULL = 0,            // 未知    VT_TARGET_STATE_OFFLINE,            // 目标脱机    VT_TARGET_STATE_STOP,                // 目标停止    VT_TARGET_STATE_REJECT,                // 目标拒绝    VT_TARGET_STATE_BUSY,                // 目标呼叫忙};[StructLayout(LayoutKind.Sequential)]public struct VT_TASK_TARGET{    public int nCount;                                // 监听,对讲,广播选择的目标数量    public int nEditPos;                            // 当前正在编辑的位置    public VT_TASK_TYPE xeTaskType;                            // 任务类型    public VT_TASK_STATE xeTaskState;                        // 任务组的任务状态    public VT_TARGET_STATE xeTargetState;                        // 对讲目标状态    public bool bIsBegin;                            // 任务是否已开始(呼叫...)    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]    public VT_TASK_STATE[] pxeTerState;    // 各终端的任务状态  VT_DEVICE_MAX_COUNT 6    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]    public ushort[] pwID;        // 终端ID(0:1号终端...)或分区号(1:分区1...) VT_BROADCAST_MAX_COUNT            128    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]    public int[] piSerIdx;    // 各终端对应的服务器编号    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]    public byte[] pucPanelNo;    // NAS-8521,呼叫到面板,终端对应的面板序号    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]    public char[] strFileName; // 文件广播时,当前广播的文件名    public uint offlineTargetIP; //离线目标IP    public ushort offlineTargetPort;  //离线目标端口};[StructLayout(LayoutKind.Sequential)]public struct tagSERVER{    public uint ipServer;                // 服务器IP (字节反序)    public ushort wServerPort;            // 服务器接收端口 (字节反序)    public bool bFixPort;                // 是否固定接收端口    public ushort wHostPort;            // 本机接收端口 (字节反序)    public bool bOnline;                // 是否联机    public bool bIsPCM;                    // 是否是PCM/ADPCM压缩    public bool bIs8K;                    // 是否是8K/22K采样    public bool bIsMultiCast;            // 是否是组播/单播    public bool bRecord;                // 是否录音    public uint ipRecord;                // 录音IP    public ushort wRecordPort;            // 录音端口};[StructLayout(LayoutKind.Sequential)]public struct VT_DEVICE_INFO{    public ushort wDeviceId;            // 设备编号(从0开始,显示时要加1)    public uint ipHost;                    // 主机IP (字节反序)    public bool bIsRegister;            // 是否注册    public u<div>本文来源gaodai.ma#com搞##代!^码@网3</div>short dwVol;                // 当前输出音量    public int iServerCount;            // 服务器的数量    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]    public tagSERVER[] pxsServer;       // 服务器    public int nTaskCount;                // 任务数量    public int nCurTask;                // 当前任务(对应于xsTaskTarget的下标)    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)]    public VT_TASK_TARGET[] pxsTaskArray;        // 任务目标};/// <summary>/// 跨平台调用方法/// </summary>public class NativeMethod{    /// <summary>    /// 路径最大大小    /// </summary>    public const int MAX_PATH = 260;    [DllImport("IPNBSVTD.dll")]    public static extern void IPNBSVTD_DeleteDevice();    [DllImport("IPNBSVTD.dll")]    public static extern byte IPNBSVTD_CreateDevice(byte ucCount);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_DeviceMute(ref bool pbMute, bool bIsAudioOut, bool bIsSet);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_DeviceVolume(ref int pdwVolume, bool bIsAudioOut, bool bIsSet);    [DllImport("IPNBSVTD.dll")]    public static extern void IPNBSVTD_SetINIFilePath(byte ucDeviceIndex, string pINIFilePath);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_OpenServer(byte ucDeviceIndex, IntPtr hParentWnd, uint nMsg);    //[DllImport("IPNBSVTD.dll")]    //public static extern bool IPNBSVTD_SetBCFromFile(byte ucDeviceIndex, bool bBCFromFile, bool bLoop,    //    [MarshalAs(UnmanagedType.LPArray)]string[] pStrFile, short sFileCount);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetBCFromFileEx(byte ucDeviceIndex, bool bBCFromFile, bool bLoop, string strFile, bool bAdd);    public static void SetBCFromFile(byte ucDeviceIndex, bool bBCFromFile, bool bLoop, List<string> files, short sFileCount)    {        for (int i = 0; i < files.Count; i++)            IPNBSVTD_SetBCFromFileEx(ucDeviceIndex, bBCFromFile, bLoop, files[i], (i == 0) ? false : true);    }    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetBCToTerm(byte ucDeviceIndex);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_GetCurTaskTarget(byte ucDeviceIndex, ref VT_TASK_TARGET pTaskTarget, int iTaskPos);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetCurTaskTarget(byte ucDeviceIndex, ref VT_TASK_TARGET pTaskTarget, int iTaskPos);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_TaskBegin(byte ucDeviceIndex, int iTaskPos);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_TaskEnd(byte ucDeviceIndex, int iTaskPos);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_GetDeviceInfo(byte ucDeviceIndex, ref VT_DEVICE_INFO pDeviceInfo);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_GetBCFileCurrent(byte ucDeviceIndex, StringBuilder strFile);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetStatusCallBack(byte ucDeviceIndex, StatusCallBack dwCallBack, IntPtr dwInstance);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetVoiceCallBack(byte ucDeviceIndex, VoiceCallBack dwCallBack, IntPtr dwInstance);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetFileBCNext(byte ucDeviceIndex);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetFileBCPause(byte ucDeviceIndex, bool bPause);            [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetFileBCPrevious(byte ucDeviceIndex);    [DllImport("IPNBSVTD.dll")]    public static extern uint IPNBSVTD_GetBCFileCurrentPlayPos(byte ucDeviceIndex, ref uint pBcFileLen);    [DllImport("IPNBSVTD.dll")]    public static extern bool IPNBSVTD_SetFileBCPlayListPos(byte ucDeviceIndex, byte ucPlayListPos);}

}

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