HttpClient实现客户端与服务器的通信

来源：互联网发布：单片机编程软件是哪些编辑：程序博客网时间：2024/05/21 09:12

本篇主要讲解了利用HttpClient实现 windows主机与linux服务器的通信与传递数据

HttpClient代码，服务器端配置

系统和安装软件
1）ubuntu 14.04 64位系统
2）sudo apt-get install apache2 sqlite3 libsqlite3-dev

配置apache 支持cgi

配置目录 /etc/apache2
html页面目录 /var/www/html
cgi-bin目录 /usr/lib/cgi-bin
日志文件 /var/log/apache2

1）/etc/apache2/mods-enable里增加支持cgi的mod

cd /etc/apache2/mods-enabled
sudo ln -s ../mods-available/cgid.conf
sudo ln -s ../mods-available/cgid.load
sudo ln -s ../mods-available/cgi.load

2) 编辑cgi代码: /usr/lib/cgi-bin/setScore.c
sudo gcc /usr/lib/cgi-bin/setScore.c -o /usr/lib/cgi-bin/setScore.cgi

3) 建立数据库
sudo sqlite3 /var/tank/tank.db
create table tscore (id integer primary key autoincrement, username varchar(32) unique not null, totalscore integer not null, score integer not null);

4) 修改数据库文件的权限
sudo chmod 777 /var/tank -R
sudo chmod www-data:www-data /var/tank -R

CGI代码如下，写数据库与读数据库并且向网页打印返回

    #include <stdio.h>    #include <sqlite3.h>    #include <string.h>    #include <stdlib.h>    int selectCallback(void* arg,int argc,char** argv,char** argvv)    {        //argv[0] id        //argv[1] username        //argv[2] totalscore        //argv[3] score        // username&totalscore&score&....        printf("%s&%s&%s&", argv[1], argv[2], argv[3]);        return 0;    }    int main()    {        printf("Content-type:text/html\n\n");    #if 0        printf("This is cocos cgi-test\n");        // 打印环境变量        extern char** environ;        int i;        for(i=0; ;++i)        {            if(environ[i])                printf("%s\n<br>", environ[i]);            else                break;        }    #endif        // set Score to Database        char* queryString = getenv("QUERY_STRING");        if(queryString == NULL)        {            printf("Err: queryString is NULL");            return 0;        }        // totalscore=%d&score=%d&user=user%d        // 获取参数        char* totalScore = strtok(queryString, "&");        char* score = strtok(NULL, "&");        char* username = strtok(NULL, "&");        strtok(totalScore, "=");        totalScore = strtok(NULL, "=");        strtok(score, "=");        score = strtok(NULL, "=");        strtok(username, "=");        username = strtok(NULL, "=");        // 写数据库        sqlite3* db;        int ret = sqlite3_open("/home/jjx/tank.db", &db);        if(ret != SQLITE_OK)        {            printf("open database error: %s", sqlite3_errstr(sqlite3_errcode(db)));            return 0;        }        char sql[2048];        sprintf(sql, "insert into tscore (username, totalscore, score) values ('%s', %s, %s)",                 username, totalScore, score);        ret = sqlite3_exec(db, sql, NULL, NULL, NULL);    #if 0        printf("%s<br>", sql);        return 0;    #endif        if(ret != SQLITE_OK)        {            printf("insert data error: %s", sqlite3_errstr(sqlite3_errcode(db)));            sqlite3_close(db);            return 0;        }        sprintf(sql, "select * from tscore order by totalscore desc limit 10");        ret = sqlite3_exec(db, sql, selectCallback, NULL, NULL);        if(ret != SQLITE_OK)        {            printf("select data error: %s", sqlite3_errstr(sqlite3_errcode(db)));            sqlite3_close(db);            return 0;        }        sqlite3_close(db);        return 0;    }

服务器端配置完成

客户端发送数据代码实现

    //send http request ,send total score and score to server        int totalScore=CCUserDefault::sharedUserDefault()->getIntegerForKey("TotalScore");        int score=CCUserDefault::sharedUserDefault()->getIntegerForKey("Score");        int userid=CCRANDOM_0_1()*100;        char url[2048];        sprintf(url,"http://192.168.226.129/cgi-bin/setScore.cgi?totalscore=%d&score=%d&user=user%d",totalScore,score,userid);        CCHttpClient *client=CCHttpClient::getInstance();        CCHttpRequest *request=new CCHttpRequest;        request->setUrl(url);        request->setRequestType(CCHttpRequest::kHttpGet);        request->setResponseCallback(this,httpresponse_selector(LayerScore::HttpResponse));        client->send(request);        request->release();

客户端接收数据

    //receive data from server        //json data is most common        if (!response->isSucceed())        {            CCLOG("request error:%s",response->getErrorBuffer());            return;        }        std::vector<char>* data=response->getResponseData();        std::vector<char>::iterator it;        std::string str;        for(it=data->begin();it!=data->end();it++)        {            str.push_back(*it);         }        char *p=new char[str.size()+1];        strcpy(p,str.c_str());        p[strlen(p)-1]=0;        int index=0;        char *username=strtok(p,"&");         char *totalScore;        char *score;        char buf[1024];        while (username)        {            totalScore=strtok(NULL,"&");            score=strtok(NULL,"&");            CCLOG("********%s,%s,%s********\n",username,totalScore,score);            //put data into labels            CCLabelTTF *label=(CCLabelTTF*)getChildByTag(1000+index++);            sprintf(buf,"%s:%s:%s",username,totalScore,score);            label->setString(buf);            username=strtok(NULL,"&");        }        delete []p;

HttpClient实现windwos主机与linux服务器通信并传递信息

以上是以DOGet方法，将参数设置在URL中以到达传递参数的作用，下面使用DOPost方法向服务器端上传图片

客户端上传代码

CCHttpClient* client = CCHttpClient::getInstance();    CCHttpRequest* req = new CCHttpRequest;    req->setUrl("http://192.168.226.129/cgi-bin/posttest.cgi");    req->setRequestType(CCHttpRequest::kHttpPost);    req->setResponseCallback(this, httpresponse_selector(T24HttpClient::HttpResponse));    char buf[8192];    FILE* f = fopen("woman.png", "rb");    int len = fread(buf, 1, 8192, f);    fclose(f);    CCLog("len=%d\n", len);    req->setRequestData((const char*)buf, len);    //req->setRequestData(buf,sizeof(buf));    client->send(req);    req->release();    return true;

服务器端接收代码

#include <stdio.h>#include <sqlite3.h>#include <string.h>#include <stdlib.h>int main(){    printf("Content-type:text/html\n\n");        int fd=creat("/home/jjx/tank/aaa.png");    int len=atoi(getenv("CONTENT_LENGTH"));    char *buf=malloc(len);    fread(buf,len,1,stdin);    write(fd,buf,len);    close(fd);    free(buf);    printf("%s\n<br>",buf);    return 0;}

上传结束，可以在相应文件路径下看到图片

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