HttpClient实现客户端与服务器的通信

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

");
    #if 0
        printf("This is cocos cgi-test
");
        // 打印环境变量
        extern char** environ;
        int i;
        for(i=0; ;++i)
        {
            if(environ[i])
                printf("%s
<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********
",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
", 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

");


        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
<br>",buf);
    return 0;
}

上传结束，可以在相应文件路径下看到图片