[移动开发]14、Android Studio通过http向C++服务端传递base64图片，然后对图片处理（写入本地）返回数据给Android studio

基本思想：最近做了一个项目需要使用将android studio 中抓取的视频帧和一些数据上传服务器处理，然后将处理结果返回给android studio 手机端

一、因为不太会写通信，着实补充了一些知识，还是不会写，尴尬了，找到了一个轻量级的项目，参考附录一，稍微修改了一下，使用rapidjson作为json的客户端数据传递和服务端数据解析

现在window11 上使用clion简单测试一下，放一下目录和贴一下cmakelist.txt即可

cmakelists.txt （客户端）

cmake_minimum_required(VERSION 3.21)
project(client)
include_directories(${CMAKE_SOURCE_DIR}/include)
set(CMAKE_CXX_STANDARD 14)
find_package(OpenCV REQUIRED)
link_libraries(ws2_32)
add_executable(client main.cpp http_client.cpp mongoose.c)
target_link_libraries(client ${OpenCV_LIBS})

代码目录

?从客户端发出一张图片，然后转成base64,使用小企鹅的rapidjson转成json串，发给虚拟机服务端（同一网段），虚拟机的服务端接收到就给我客户端返回了 0 否则（没收到或者发送base64无法解成图片） 返回-1 ，测试是没问题的。 下图是服务端接收到base64转成图片写入到本地

?二、为了实现Android studio 手机端和PC端在局域网中完成http通信，需要先搭建一个nginx 服务，在局域网中进行数据转发，要是nginx部署在公网上，就可以在公网上进行数据转发了，我直接在我上ffmpeg 流服务器的nginx-win-rtmp.conf文件添加的端口转发服务4、Android 手机端进行实时目标检测，并使用FFMPEG将检测的视频流推到服务器显示_sxj731533730的博客-CSDN博客_android 目标检测??在文件

location /hello {
     # rewrite ^.+hello/?(.*)$ /$1 break;       
      proxy_pass http://192.168.10.151:7999/api/hello;
          proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

配置文件添加位置

贴一下含有推流和转发http的完整配置文件??nginx-win-rtmp.conf

#user  nobody;
# multiple workers works !
worker_processes  2;
 
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
 
#pid        logs/nginx.pid;
 
events {
    worker_connections  8192;
    # max value 32768, nginx recycling connections+registry optimization = 
    #   this.value * 20 = max concurrent connections currently tested with one worker
    #   C1000K should be possible depending there is enough ram/cpu power
    # multi_accept on;
}
 
rtmp {
    server {
        listen 1935;
        chunk_size 4000;
        application live {
             live on;
 
             # record first 1K of stream
             record all;
             record_path /tmp/av;
             record_max_size 1K;
 
             # append current timestamp to each flv
             record_unique on;
 
             # publish only from localhost
             allow publish 127.0.0.1;
             deny publish all;
 
             #allow play all;
        }
    }
}
 
http {
    #include      /nginx/conf/naxsi_core.rules;
    include       mime.types;
    default_type  application/octet-stream;
 
    #log_format  main  '$remote_addr:$remote_port - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';
 
    #access_log  logs/access.log  main;
 
#     # loadbalancing PHP
#     upstream myLoadBalancer {
#         server 127.0.0.1:9001 weight=1 fail_timeout=5;
#         server 127.0.0.1:9002 weight=1 fail_timeout=5;
#         server 127.0.0.1:9003 weight=1 fail_timeout=5;
#         server 127.0.0.1:9004 weight=1 fail_timeout=5;
#         server 127.0.0.1:9005 weight=1 fail_timeout=5;
#         server 127.0.0.1:9006 weight=1 fail_timeout=5;
#         server 127.0.0.1:9007 weight=1 fail_timeout=5;
#         server 127.0.0.1:9008 weight=1 fail_timeout=5;
#         server 127.0.0.1:9009 weight=1 fail_timeout=5;
#         server 127.0.0.1:9010 weight=1 fail_timeout=5;
#         least_conn;
#     }
 
    sendfile        off;
    #tcp_nopush     on;
 
    server_names_hash_bucket_size 128;
 
## Start: Timeouts ##
    client_body_timeout   10;
    client_header_timeout 10;
    keepalive_timeout     30;
    send_timeout          10;
    keepalive_requests    10;
## End: Timeouts ##
 
    #gzip  on;
 
    server {
        listen       80;
        server_name  localhost;
		
       location /hello {
     # rewrite ^.+hello/?(.*)$ /$1 break;       
      proxy_pass http://192.168.10.151:7999/api/hello;
          proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
 
        location /stat {
            rtmp_stat all;
            rtmp_stat_stylesheet stat.xsl;
        }
        location /stat.xsl {
            root nginx-rtmp-module/;
        }
        location /control {
            rtmp_control all;
        }
 
        #charset koi8-r;
        #access_log  logs/host.access.log  main;
 
        ## Caching Static Files, put before first location
        #location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
        #    expires 14d;
        #    add_header Vary Accept-Encoding;
        #}
 
# For Naxsi remove the single # line for learn mode, or the ## lines for full WAF mode
        location / {
            #include    /nginx/conf/mysite.rules; # see also http block naxsi include line
            ##SecRulesEnabled;
         ##DeniedUrl "/RequestDenied";
         ##CheckRule "$SQL >= 8" BLOCK;
         ##CheckRule "$RFI >= 8" BLOCK;
         ##CheckRule "$TRAVERSAL >= 4" BLOCK;
         ##CheckRule "$XSS >= 8" BLOCK;
            root   html;
            index  index.html index.htm;
        }
 
# For Naxsi remove the ## lines for full WAF mode, redirect location block used by naxsi
        ##location /RequestDenied {
        ##    return 412;
        ##}
 
## Lua examples !
#         location /robots.txt {
#           rewrite_by_lua '
#             if ngx.var.http_host ~= "localhost" then
#               return ngx.exec("/robots_disallow.txt");
#             end
#           ';
#         }
        #error_page  404              /404.html;
        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}
        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000; # single backend process
        #    fastcgi_pass   myLoadBalancer; # or multiple, see example above
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        #    include        fastcgi_params;
        #}
        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
    # HTTPS server
    #
    #server {
    #    listen       443 ssl spdy;
    #    server_name  localhost;
    #    ssl                  on;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;
    #    ssl_session_timeout  5m;
    #    ssl_prefer_server_ciphers On;
    #    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    #    ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:ECDH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!eNULL:!MD5:!DSS:!EXP:!ADH:!LOW:!MEDIUM;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
}

启动服务

D:\>cd nginx_1.7.11.3_Gryphon

D:\nginx_1.7.11.3_Gryphon>nginx.exe -c conf\nginx-win-rtmp.conf

启动c++服务端程序，然后在网页输入地址

?

二：随便找一个android studio 工程吧，手动检测图片的工程，搞成检测完图片后向服务器发送，服务器接收到之后向android studio 回复收到。我用的我之前的? 工程添加一个post函数即可8、Android Studio 使用MNN进行Swin_Transformer分类识别_sxj731533730的博客-CSDN博客t

  public void postPic(String bmpString) {
        String url = "http://192.168.10.151/hello";
        JSONObject json1 = new JSONObject();
        try {
            json1.put("data", bmpString);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        MediaType JSON = MediaType.parse("application/json; charset=utf-8");
        RequestBody body = RequestBody.create(JSON, json1.toString());
        OkgoUtils.postjson(url, body, new StringCallback() {

            @Override
            public void onSuccess(Response<String> response) {
                try {

                    String json = response.body();
                    JSONObject jsonObject = new JSONObject(json);
                    //根据服务端的状态自行更改
                    int result = jsonObject.getInt("result");
                    if(result == 0){
                        Toast.makeText(MainActivity.this, "图片上传成功，且接收到返回值", Toast.LENGTH_SHORT).show();

                    }else{
                        Toast.makeText(MainActivity.this, "图片上传失败，且接收到返回值", Toast.LENGTH_SHORT).show();

                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

在app/build.gradle中添加

dependencies {
? ? implementation 'com.squareup.okhttp3:okhttp:3.10.0'
? ? implementation 'com.lzy.net:okgo:3.0.4'
}

其它代码不详细，贴一下代码目录和几个关键函数

?测试图片检测完成之后，然后构建json传，向服务端c++ 去post数据，服务端接到数据之后，处理（写到本地）成功之后，返回结果给Android Studio 端 收到数据

三、android studio手机端的检测结果（老年机 不要在意速度）

?PC当做服务器，接收到base64字符串，然后转成图片，最后写到服务器所在的本地磁盘(这里其实涉及到 手机端 抓取帧 送到服务端做处理 然后返回结果给手机 如 人证比对 活体检测 等相关领域)

?简单的工程，涉及的pc端的服务端和客户端和android studio 测试代码

github地址：https://github.com/sxj731533730/httpserver_client

参考：
GitHub - tashaxing/CppHttpDemo: light weight C++ httpserver and httpclient based on mongoose, also support websocket