C# 如何調用 C++ DLL中的函數介面和回呼函數

1、C#中大部分基礎資料型別 (Elementary Data Type)都和C++的基礎資料型別 (Elementary Data Type)相同，因此基礎資料型別 (Elementary Data Type)的轉換比較簡單，需要注意的就是位元組大小。 2、C++數組和C#的數群組轉換需要注意的就是需要注意，需要增加聲明如[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]才能定義一個C++中的數組元素為10個的數組。 3、 C++的回呼函數介面需要採用C#中的委託函數方法，C++的中回呼函數設定中，一般使用的是地址值，因此需要C#中顯示採用託管函數。 4、C++的指標數組，可用C#中的IntPtr ;如果只是地址指標，則C#中參考型別即可。類型前加ref

舉例說明： 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,                // 未接來電};public enum VT_TASK_TYPE //終端狀態{    VT_TASK_TYPE_NULL,                //空閑(無任務)    VT_TASK_TYPE_TO_MONITOR,        //發起監聽    VT_TASK_TYPE_BY_MONITOR,        //被監聽    VT_TASK_TYPE_TO_BROADCAST,        //發起采播    VT_TASK_TYPE_BY_BROADCAST,        //接收采播    VT_TASK_TYPE_TO_TALK,            //發起對講    VT_TASK_TYPE_BY_TALK,            //接收對講    VT_TASK_TYPE_MULTITALK,            //多方通話    VT_TASK_TYPE_OFFLINETALK,       //離線對講};public enum VT_TASK_STATE //終端任務狀態        {    VT_TASK_STATE_NULL,                // 無任務    VT_TASK_STATE_STOP,                // 監聽停止,對講停止,廣播停止    VT_TASK_STATE_CONNECTING,        // 監聽:串連中    VT_TASK_STATE_CALLING,            // 對講:呼叫中    VT_TASK_STATE_BEGIN_BC_PROMPT,    // 廣播:開始提示音    VT_TASK_STATE_END_BC_PROMPT,    // 廣播:結束提示音    VT_TASK_STATE_ONGOING,            // 監聽中,對講中,廣播中};public enum VT_TARGET_STATE // 目標狀態{    VT_TARGET_STATE_NULL = 0,            // 未知    VT_TARGET_STATE_OFFLINE,            // 目標離線    VT_TARGET_STATE_STOP,                // 目標停止    VT_TARGET_STATE_REJECT,                // 目標拒絕    VT_TARGET_STATE_BUSY,                // 目標呼叫忙};[StructLayout(LayoutKind.Sequential)]public struct VT_TASK_TARGET{    public int nCount;                                // 監聽,對講,廣播選擇的目標數量    public int nEditPos;                            // 當前正在編輯的位置    public VT_TASK_TYPE xeTaskType;                            // 任務類型    public VT_TASK_STATE xeTaskState;                        // 工作群組的任務狀態    public VT_TARGET_STATE xeTargetState;                        // 對講目標狀態    public bool bIsBegin;                            // 任務是否已開始(呼叫...)    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]    public VT_TASK_STATE[] pxeTerState;    // 各終端的任務狀態  VT_DEVICE_MAX_COUNT 6    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]    public ushort[] pwID;        // 終端ID(0:1號終端...)或分區號(1:分區1...) VT_BROADCAST_MAX_COUNT            128    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]    public int[] piSerIdx;    // 各終端對應的伺服器編號    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]    public byte[] pucPanelNo;    // NAS-8521,呼叫到面板,終端對應的面板序號    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]    public char[] strFileName; // 檔案廣播時,當前廣播的檔案名稱    public uint offlineTargetIP; //離線目標IP    public ushort offlineTargetPort;  //離線目標連接埠};[StructLayout(LayoutKind.Sequential)]public struct tagSERVER{    public uint ipServer;                // 伺服器IP (位元組反序)    public ushort wServerPort;            // 伺服器接收埠 (位元組反序)    public bool bFixPort;                // 是否固定接收埠    public ushort wHostPort;            // 本機接收埠 (位元組反序)    public bool bOnline;                // 是否聯機    public bool bIsPCM;                    // 是否是PCM/ADPCM壓縮    public bool bIs8K;                    // 是否是8K/22K採樣    public bool bIsMultiCast;            // 是否是組播/單播    public bool bRecord;                // 是否錄音    public uint ipRecord;                // 錄音IP    public ushort wRecordPort;            // 錄音連接埠};[StructLayout(LayoutKind.Sequential)]public struct VT_DEVICE_INFO{    public ushort wDeviceId;            // 裝置編號(從0開始,顯示時要加1)    public uint ipHost;                    // 主機IP (位元組反序)    public bool bIsRegister;            // 是否註冊    public ushort dwVol;                // 當前輸出音量    public int iServerCount;            // 伺服器的數量    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]    public tagSERVER[] pxsServer;       // 伺服器    public int nTaskCount;                // 任務數量    public int nCurTask;                // 當前任務(對應於xsTaskTarget的下標)    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)]    public VT_TASK_TARGET[] pxsTaskArray;        // 任務目標};/// <summary>/// 跨平台叫用方法/// </summary>public class NativeMethod{    /// <summary>    /// 路徑最大大小    /// </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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