Unity调用C++ dll实现打开双目相机

1.vs中生成dll

对应的生成dll的cpp如下 

#include<opencv2/opencv.hpp>
#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
using namespace cv;

#define EXPORT_API __declspec(dllexport)

VideoCapture my_camera;
int width = 640;
int height = 480;

extern "C" bool EXPORT_API openCamera()
{
bool my_open = false;
while (!my_camera.isOpened())
{
std::cout << "Cannot open the camera!" << std::endl;
my_camera.open(0);//一个接口能同时打开两个摄像头
}
my_camera.set(CV_CAP_PROP_FRAME_WIDTH, width*2);
my_camera.set(CV_CAP_PROP_FRAME_HEIGHT, height);
if (my_camera.isOpened())
{
my_open = true;
}
return my_open;
}

extern "C" void   EXPORT_API recieveFrame(uchar* texturePtr)
{

Mat my_frameBGR;
Mat my_frameRBG;
my_camera >> my_frameBGR;
if (my_frameBGR.data)
{
cvtColor(my_frameBGR, my_frameRBG, CV_BGR2RGB);
memcpy(texturePtr, my_frameRBG.data, my_frameRBG.cols*my_frameRBG.rows*my_frameRBG.channels()*sizeof(uchar));
}

}

extern "C" void EXPORT_API closeCamera()
{
if (my_camera.isOpened())
{
my_camera.release();
}
}

2.unity中justatry脚本

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using System.Runtime.InteropServices;用 c++中 dll 文件需要引入

public class justatry : MonoBehaviour {

[DllImport("_dectecting")]
public static extern bool openCamera();

[DllImport("_dectecting")]
public static extern bool recieveFrame(byte[] imageData);

[DllImport("_dectecting")]
public static extern bool closeCamera();
public bool IsOpen = false;
public byte[] imageData;
public Texture2D tex;
public int Width = 640;
public int Length = 480;
// Use this for initialization
void Start () {
IsOpen = openCamera();
if(IsOpen)
{
imageData = new byte[Length * Width * 3*2];
tex = new Texture2D(Width*2, Length, TextureFormat.RGB24, false);
}
}

// Update is called once per frame
void Update () {
if (IsOpen)
{
recieveFrame(imageData);
tex.LoadRawTextureData(imageData);
tex.Apply();
GetComponent<Renderer>().material.mainTexture = tex;

}
}
void CloseCamera()
{
if (IsOpen)
{
closeCamera();

}
}
public void OnApplicatoinQuit()
{
closeCamera();
}
}
using System.Runtime.InteropServices;用 c++中 dll 文件需要引入

public class justatry : MonoBehaviour {

[DllImport("_dectecting")]
public static extern bool openCamera();

[DllImport("_dectecting")]
public static extern bool recieveFrame(byte[] imageData);

[DllImport("_dectecting")]
public static extern bool closeCamera();
public bool IsOpen = false;
public byte[] imageData;
public Texture2D tex;
public int Width = 640;
public int Length = 480;
// Use this for initialization
void Start () {
IsOpen = openCamera();
if(IsOpen)
{
imageData = new byte[Length * Width * 3*2];
tex = new Texture2D(Width*2, Length, TextureFormat.RGB24, false);
}
}

// Update is called once per frame
void Update () {
if (IsOpen)
{
recieveFrame(imageData);
tex.LoadRawTextureData(imageData);
tex.Apply();
GetComponent<Renderer>().material.mainTexture = tex;

}
}
void CloseCamera()
{
if (IsOpen)
{
closeCamera();

}
}
public void OnApplicatoinQuit()
{
closeCamera();
}
}

注意，脚本要挂在plane上

3.在unity中调试

dll的输出目录是 unity项目工程名\Assets\Plugins

D:\Michael Wang\SC\2018\1\openDoublecamera\UnityTry\Assets\Plugins

4.在vs中调试

4.1 把unity的工程生成对应的exe

这是生成的unity exe对应的生成目录

对应的目录如

D:\Michael Wang\SC\2018\1\openDoublecamera\UnityTry\test.exe

4.2 在vs项目的属性中做如下设置

命令后用上面的路径，注意是放在命令里不是命令参数里

在对应的unity exe目录中找到 unity工程名_Data下Plugins的目录是

D:\Michael Wang\SC\2018\1\openDoublecamera\UnityTry\test_Data\Plugins

4.3 在VS工程的属性中的输出目录设置为上面的目录

做完以上设置就直接可以在VS下调试了。

5.注意vs和unity的平台x86/x64要对应

5.1 vs x86/x64

5.2 unity 

如果按以上设置还是不对，提示找不到dll，则把dll的输出放在与Plugins或Assets文件夹同一级尝试。

如果你已经把dll放在这里了，还是显示找不到，则一定是你用vs生成dll的库没有在环境变量里，然后unity里面调用时找不到vs生成dll所依赖的一些库。可以把一些你知道的库直接放在vs生成的dll一起，全放在unity工程里，应该就好了。

来源：https://blog.csdn.net/moonlightpeng/article/details/79017204