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\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;
}