RealSense(1)——SDK安装及helllo-world

1.安装SDK
从github上下载所需工具，https://github.com/IntelRealSense/librealsense/releases，开发时只需要下载Intel.RealSense.SDK.exe 安装。

SDK默认安装路径C:\Program Files (x86)\Intel RealSense SDK 2.0 。

2.环境配置
当进行开发时，需要自行新建项目，配置环境，编写代码。
配置环境如下：

1.包含目录中添加：
C:\Program Files (x86)\Intel RealSense SDK 2.0\include
C:\Program Files (x86)\Intel RealSense SDK 2.0\samples
2.库目录中添加：
C:\Program Files (x86)\Intel RealSense SDK 2.0\lib\x86
3.将Intel RealSense SDK 2.0\bin\x86里面的realsense2.dll文件复制到.cpp文件同一目录下。
3.快捷配置
在项目属性管理器中加入C:\Program Files (x86)\Intel RealSense SDK 2.0
目录下的intel.realsense.props文件即可。
如下图：

4.hello-world代码
查询相机到图像中心物体的距离

#include "stdafx.h"
#include <iostream>
#include "librealsense2/rs.hpp"
#pragma comment(lib, "realsense2.lib") //等同于在链接器的输入中添加附加依赖项
using namespace rs2;
using namespace std;

void main()
{
    // Create a Pipeline, which serves as a top-level API for streaming and processing frames
    pipeline p;

    // Configure and start the pipeline
    p.start();

    while (true)
    {
        // Block program until frames arrive
        frameset frames = p.wait_for_frames();

        // Try to get a frame of a depth image
        depth_frame depth = frames.get_depth_frame();
        // The frameset might not contain a depth frame, if so continue until it does
        if (!depth) continue;

        // Get the depth frame's dimensions
        float width = depth.get_width();
        float height = depth.get_height();

        // Query the distance from the camera to the object in the center of the image
        float dist_to_center = depth.get_distance(width / 2, height / 2);

        // Print the distance 
        cout << "The camera is facing an object " << dist_to_center << " meters away \r";
    }
}