Anyty C++DLL封装成NetDLL进行调用

Anyty C++DLL封装成NetDLL进行调用

由于项目中要用到摄像头进行画面的抓拍，提供的C++动态链接库dll.但项目使用C#进行开发的，需要进行二次封装。

主要涉及到两点：
1.C++中常用的变量在C#中的映射
2.C++方法在C#中的调用
3.C++回调函数在C#中的调用

---

1.C++中常用的变量在C#中的映射

我主要整理了自己用到的一些变量之间的映射关系。

C++	C#
int	int
long	int
long long	long

---

2.C++方法在C#中的调用

antydll.h头文件

#pragma once
#include "ExportInterface.h"
#ifdef ANYTYDLL_EXPORTS;
#define ANYTYDLL_API __declspec(dllexport)
#else
#define ANYTYDLL_API __declspec(dllimport) 
#endif


//回调函数原形
typedef void (CALLBACK *fSnapRev)(BYTE *pBuf, int width,int height, long RevLen,BOOL cap,BOOL snap);

//初始化设备
EXTERN_C ANYTYDLL_API bool InitDevice(HWND hwndFound);
//显示视频
EXTERN_C ANYTYDLL_API void DisplayVideo();
//抓拍
EXTERN_C ANYTYDLL_API void SnapPicture();
//设置回调函数
EXTERN_C ANYTYDLL_API void SetSnapRev(fSnapRev callback);
//设置图片长宽
EXTERN_C ANYTYDLL_API BOOL SetFormat(int width, int height);
//关闭设备
EXTERN_C ANYTYDLL_API void ReleaseDevice();

AnytyDLL.cpp

// AnytyDLL.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "ExportInterface.h"
#include "AnytyDLL.h"
#include <iostream>

using namespace std;

//HWND hwndFound;
ExportInterface inter;
BOOL isSnap = FALSE;
//设置回调函数
CALLFUNCTION CallbackFunReceiveData;
fSnapRev fSnapRevCallbackFun;

BOOL WINAPI OnReceiveData(BYTE *pBuffer, int width, int height, long datasize, BOOL cap)
{
    fSnapRevCallbackFun(pBuffer, width, height, datasize,cap, isSnap);
    return TRUE;
}

ANYTYDLL_API bool InitDevice(HWND hwndFound)
{
    BOOL f = inter.Initialization(hwndFound);
    if (f == TRUE)
    {
        CallbackFunReceiveData=OnReceiveData;
        return true;
    }
    else
    {
        return false;
    }
}

ANYTYDLL_API void DisplayVideo()
{
    inter.SetCallBack(CallbackFunReceiveData);
}

ANYTYDLL_API void SnapPicture() {

    isSnap = TRUE;
}

ANYTYDLL_API void SetSnapRev(fSnapRev callback)
{
    fSnapRevCallbackFun = callback;
}

ANYTYDLL_API void ReleaseDevice()
{

    inter.ReleaseCapture();
}

ANYTYDLL_API BOOL SetFormat(int width, int height) 
{
    return inter.SetFormat(width,height);
}

C#中封装成 类 AnytyClientNETl
具体对应代码如下：

public unsafe class AnytyClientNET
    {
        const string dllPath = @"AnytyDLL.dll";
        //typedef void (CALLBACK* fSnapRev)(BYTE* pBuf, long RevLen, int width,int height);
        //定义委托
        public delegate void fSnapRev(IntPtr pBuf, int width, int height, int RevLen,bool cap, bool snap);
        public static fSnapRev fSnapRevCallback;

        //------------------------------Methods---------------------------------------------------------------------//
        //bool InitDevice(HWND hwndFound)
        [DllImport(dllPath, EntryPoint = "InitDevice", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static bool InitDevice(IntPtr HWND);
        //void DisplayVideo()
        [DllImport(dllPath, EntryPoint = "DisplayVideo", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static void DisplayVideo();
        //void SnapPicture();
        [DllImport(dllPath, EntryPoint = "SnapPicture", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static void SnapPicture();
        //void SetSnapRev(fSnapRev callbackFun)
        [DllImport(dllPath, EntryPoint = "SetSnapRev", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static void SetSnapRev(fSnapRev callback);
        //void ReleaseDevice()
        [DllImport(dllPath, EntryPoint = "ReleaseDevice", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static void ReleaseDevice();
        //BOOL SetFormat(int width, int height) 
        [DllImport(dllPath, EntryPoint = "SetFormat", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public extern static bool SetFormat(int width,int height);
    }

3.C++回调函数在C#中的调用

委托的具体实现

 //获取数据回调函数
        private void ReceviceData(IntPtr pBuf, int width, int height, int RevLen, bool cap, bool snap)
        {
                byte[] buf = new byte[RevLen];
                Marshal.Copy(pBuf, buf, 0, RevLen);
                try
                {
                    //Create a  bitmap.
                    Bitmap bmp = new Bitmap(width, height);
                    // Retrieve the bitmap data from the the bitmap.
                    System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height),
                       ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
                    //set buffer data
                    Marshal.Copy(buf, 0, bmpData.Scan0, buf.Length);
                    // unlock
                    bmp.UnlockBits(bmpData);

                    //抓拍图像
                    if (cap || snap)
                    {
                        var file = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".jpg");
                        bmp.Save(file, ImageFormat.Bmp);
                    }

                    //显示画面
                    this.pictureBox1.Image = bmp;

                }
                catch (Exception ex)
                {
                    //MessageBox.Show(ex.Message);
                }
        }

 private void btnInit_Click(object sender, EventArgs e)
        {
            IntPtr hwnd = this.Handle;
            bool res = AnytyClientNET.InitDevice(hwnd);
            if (res)
            {
                //设置回调函数 获取数据
                AnytyClientNET.fSnapRevCallback = new AnytyClientNET.fSnapRev(ReceviceData);
                AnytyClientNET.SetSnapRev(AnytyClientNET.fSnapRevCallback);

                //AnytyClientNET.SetFormat(1280,1024);

                MessageBox.Show("初始化成功");
            }
            else
            {
                MessageBox.Show("初始化失败，请检查设备是否打开？");
            }

        }