libcurl 是一个很成熟的网络库,利用它可以很容易的完成一些网络请求,下面将展示post,get,文件上传等网络操作。
利用libcurl库通过http进行文件上传
void CHttp::PostFile(const char *url, const char *file, const char *filename, char *cookie, string &strContent)
{
strContent.clear();
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "upfile", CURLFORM_FILE, file,CURLFORM_CONTENTTYPE, "text/xml", CURLFORM_END);
curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "filename", CURLFORM_COPYCONTENTS, filename, CURLFORM_END);
curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "action", CURLFORM_COPYCONTENTS, "upload", CURLFORM_END);
CURL* curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 5); // 重定向次数
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);//设置301、302跳转跟随location
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);// 超时10秒
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFunc);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &strContent);
if (cookie)
{
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie);
curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie);
}
if (0 == strncmp(url, "https:", 6))
{
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
}
CURLcode code = curl_easy_perform(curl);
if (CURLE_OK != code)
{
}
if (curl)
curl_easy_cleanup(curl);
}
利用libcurl库通过http进行GET请求
不用设置cookie,就传递参数NULL,调用方式
string strContent;
Get("www.baidu.com",NULL,strContent);
void CHttp::Get(const char *url, char *cookie, string &strContent)
{
strContent.clear();
string strHeader;
CURL* curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 5); // 重定向次数
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);//设置301、302跳转跟随location
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);// 超时10秒
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFunc);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &strContent);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, HeaderFun);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &strHeader);
if (cookie)
{
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie);
curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie);
}
if (0 == strncmp(url, "https:", 6))
{
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
}
CURLcode code = curl_easy_perform(curl);
if (CURLE_OK != code)
{
}
if (curl)
curl_easy_cleanup(curl);
}
利用libcurl库通过http进行POST请求
void CHttp::PostForm(const char *url, const char *param,char *cookie, string &strContent)
{
strContent.clear();
string strHeader;
CURL* curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 10L);
curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);
curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 5); // 重定向次数
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);//设置301、302跳转跟随location
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);// 超时10秒
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFunc);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &strContent);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, HeaderFun);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &strHeader);
if (cookie)
{
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie);
curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie);
}
if (param)
{
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, param);
}
if (0 == strncmp(url, "https:", 6))
{
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
}
CURLcode code = curl_easy_perform(curl);
if (CURLE_OK != code)
{
}
if (curl)
curl_easy_cleanup(curl);
}
libcurl库的编译过程可以看这篇文章的介绍: