你如何用C ++发出HTTP请求？
https://stackoverflow.com/questions/1011339
-
06-07-2019 - |
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有没有办法轻松使用C ++发出HTTP请求？具体来说，我想下载页面的内容（API）并检查内容以查看它是否包含1或0.是否也可以将内容下载到字符串中？
解决方案
我遇到了同样的问题。 libcurl 非常完整。有一个C ++包装器 curlpp ，当你要求一个C ++库时，你可能会对它感兴趣。 neon 是另一个有趣的C库，它也支持 WebDAV 。
如果你使用C ++，curlpp似乎很自然。源代码分发中提供了许多示例。 要获取URL的内容，您可以执行类似的操作（从示例中提取）：// Edit : rewritten for cURLpp 0.7.3
// Note : namespace changed, was cURLpp in 0.7.2 ...
#include <curlpp/cURLpp.hpp>
#include <curlpp/Options.hpp>
// RAII cleanup
curlpp::Cleanup myCleanup;
// Send request and get a result.
// Here I use a shortcut to get it in a string stream ...
std::ostringstream os;
os << curlpp::options::Url(std::string("http://www.wikipedia.org"));
string asAskedInQuestion = os.str();
请参阅 curlpp源代码分发中的examples目录，有很多更复杂的情况，以及使用curlpp的简单完整的最小版本。
我的2美分......
其他提示
Windows代码：
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <iostream>
#include <vector>
#include <locale>
#include <sstream>
using namespace std;
#pragma comment(lib,"ws2_32.lib")
int main( void ){
WSADATA wsaData;
SOCKET Socket;
SOCKADDR_IN SockAddr;
int lineCount=0;
int rowCount=0;
struct hostent *host;
locale local;
char buffer[10000];
int i = 0 ;
int nDataLength;
string website_HTML;
// website url
string url = "www.google.com";
//HTTP GET
string get_http = "GET / HTTP/1.1\r\nHost: " + url + "\r\nConnection: close\r\n\r\n";
if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0){
cout << "WSAStartup failed.\n";
system("pause");
//return 1;
}
Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
host = gethostbyname(url.c_str());
SockAddr.sin_port=htons(80);
SockAddr.sin_family=AF_INET;
SockAddr.sin_addr.s_addr = *((unsigned long*)host->h_addr);
if(connect(Socket,(SOCKADDR*)(&SockAddr),sizeof(SockAddr)) != 0){
cout << "Could not connect";
system("pause");
//return 1;
}
// send GET / HTTP
send(Socket,get_http.c_str(), strlen(get_http.c_str()),0 );
// recieve html
while ((nDataLength = recv(Socket,buffer,10000,0)) > 0){
int i = 0;
while (buffer[i] >= 32 || buffer[i] == '\n' || buffer[i] == '\r'){
website_HTML+=buffer[i];
i += 1;
}
}
closesocket(Socket);
WSACleanup();
// Display HTML source
cout<<website_HTML;
// pause
cout<<"\n\nPress ANY key to close.\n\n";
cin.ignore(); cin.get();
return 0;
}
这是一个更好的实现：
#include <windows.h>
#include <string>
#include <stdio.h>
using std::string;
#pragma comment(lib,"ws2_32.lib")
HINSTANCE hInst;
WSADATA wsaData;
void mParseUrl(char *mUrl, string &serverName, string &filepath, string &filename);
SOCKET connectToServer(char *szServerName, WORD portNum);
int getHeaderLength(char *content);
char *readUrl2(char *szUrl, long &bytesReturnedOut, char **headerOut);
int main()
{
const int bufLen = 1024;
char *szUrl = "http://stackoverflow.com";
long fileSize;
char *memBuffer, *headerBuffer;
FILE *fp;
memBuffer = headerBuffer = NULL;
if ( WSAStartup(0x101, &wsaData) != 0)
return -1;
memBuffer = readUrl2(szUrl, fileSize, &headerBuffer);
printf("returned from readUrl\n");
printf("data returned:\n%s", memBuffer);
if (fileSize != 0)
{
printf("Got some data\n");
fp = fopen("downloaded.file", "wb");
fwrite(memBuffer, 1, fileSize, fp);
fclose(fp);
delete(memBuffer);
delete(headerBuffer);
}
WSACleanup();
return 0;
}
void mParseUrl(char *mUrl, string &serverName, string &filepath, string &filename)
{
string::size_type n;
string url = mUrl;
if (url.substr(0,7) == "http://")
url.erase(0,7);
if (url.substr(0,8) == "https://")
url.erase(0,8);
n = url.find('/');
if (n != string::npos)
{
serverName = url.substr(0,n);
filepath = url.substr(n);
n = filepath.rfind('/');
filename = filepath.substr(n+1);
}
else
{
serverName = url;
filepath = "/";
filename = "";
}
}
SOCKET connectToServer(char *szServerName, WORD portNum)
{
struct hostent *hp;
unsigned int addr;
struct sockaddr_in server;
SOCKET conn;
conn = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (conn == INVALID_SOCKET)
return NULL;
if(inet_addr(szServerName)==INADDR_NONE)
{
hp=gethostbyname(szServerName);
}
else
{
addr=inet_addr(szServerName);
hp=gethostbyaddr((char*)&addr,sizeof(addr),AF_INET);
}
if(hp==NULL)
{
closesocket(conn);
return NULL;
}
server.sin_addr.s_addr=*((unsigned long*)hp->h_addr);
server.sin_family=AF_INET;
server.sin_port=htons(portNum);
if(connect(conn,(struct sockaddr*)&server,sizeof(server)))
{
closesocket(conn);
return NULL;
}
return conn;
}
int getHeaderLength(char *content)
{
const char *srchStr1 = "\r\n\r\n", *srchStr2 = "\n\r\n\r";
char *findPos;
int ofset = -1;
findPos = strstr(content, srchStr1);
if (findPos != NULL)
{
ofset = findPos - content;
ofset += strlen(srchStr1);
}
else
{
findPos = strstr(content, srchStr2);
if (findPos != NULL)
{
ofset = findPos - content;
ofset += strlen(srchStr2);
}
}
return ofset;
}
char *readUrl2(char *szUrl, long &bytesReturnedOut, char **headerOut)
{
const int bufSize = 512;
char readBuffer[bufSize], sendBuffer[bufSize], tmpBuffer[bufSize];
char *tmpResult=NULL, *result;
SOCKET conn;
string server, filepath, filename;
long totalBytesRead, thisReadSize, headerLen;
mParseUrl(szUrl, server, filepath, filename);
///////////// step 1, connect //////////////////////
conn = connectToServer((char*)server.c_str(), 80);
///////////// step 2, send GET request /////////////
sprintf(tmpBuffer, "GET %s HTTP/1.0", filepath.c_str());
strcpy(sendBuffer, tmpBuffer);
strcat(sendBuffer, "\r\n");
sprintf(tmpBuffer, "Host: %s", server.c_str());
strcat(sendBuffer, tmpBuffer);
strcat(sendBuffer, "\r\n");
strcat(sendBuffer, "\r\n");
send(conn, sendBuffer, strlen(sendBuffer), 0);
// SetWindowText(edit3Hwnd, sendBuffer);
printf("Buffer being sent:\n%s", sendBuffer);
///////////// step 3 - get received bytes ////////////////
// Receive until the peer closes the connection
totalBytesRead = 0;
while(1)
{
memset(readBuffer, 0, bufSize);
thisReadSize = recv (conn, readBuffer, bufSize, 0);
if ( thisReadSize <= 0 )
break;
tmpResult = (char*)realloc(tmpResult, thisReadSize+totalBytesRead);
memcpy(tmpResult+totalBytesRead, readBuffer, thisReadSize);
totalBytesRead += thisReadSize;
}
headerLen = getHeaderLength(tmpResult);
long contenLen = totalBytesRead-headerLen;
result = new char[contenLen+1];
memcpy(result, tmpResult+headerLen, contenLen);
result[contenLen] = 0x0;
char *myTmp;
myTmp = new char[headerLen+1];
strncpy(myTmp, tmpResult, headerLen);
myTmp[headerLen] = NULL;
delete(tmpResult);
*headerOut = myTmp;
bytesReturnedOut = contenLen;
closesocket(conn);
return(result);
}
在Linux上，我尝试了cpp-netlib，libcurl，curlpp，urdl，boost :: asio并考虑了Qt（但根据许可证将其关闭）。所有这些都不完整，不适合这种用途，界面稀疏，文档很差，没有维护或不支持https。
然后，根据 https://stackoverflow.com/a/1012577/278976 的建议，我尝试了POCO 。哇，我希望我多年前见过。以下是发出HTTP GET请求的示例：
http://xjia.heroku.com / 2011/09/10 /学习POCO-得到与 - HTTP /
POCO是免费的，开源的（增强许可证）。不，我与公司没有任何关系;我真的很喜欢他们的界面。干得好（和女孩们）。
http://pocoproject.org/download/index.html
希望这有助于某人...我花了三天的时间尝试所有这些库。
这是我在cURL周围的最小包装器，只能将网页作为字符串获取。例如，这对于单元测试很有用。它基本上是围绕C代码的RAII包装器。
安装<！> quot; libcurl <！> quot;在您的机器上yum install libcurl libcurl-devel或等效。
用法示例：
CURLplusplus client;
string x = client.Get("http://google.com");
string y = client.Get("http://yahoo.com");
班级实施：
#include <curl/curl.h>
class CURLplusplus
{
private:
CURL* curl;
stringstream ss;
long http_code;
public:
CURLplusplus()
: curl(curl_easy_init())
, http_code(0)
{
}
~CURLplusplus()
{
if (curl) curl_easy_cleanup(curl);
}
std::string Get(const std::string& url)
{
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
ss.str("");
http_code = 0;
res = curl_easy_perform(curl);
if (res != CURLE_OK)
{
throw std::runtime_error(curl_easy_strerror(res));
}
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
return ss.str();
}
long GetHttpCode()
{
return http_code;
}
private:
static size_t write_data(void *buffer, size_t size, size_t nmemb, void *userp)
{
return static_cast<CURLplusplus*>(userp)->Write(buffer,size,nmemb);
}
size_t Write(void *buffer, size_t size, size_t nmemb)
{
ss.write((const char*)buffer,size*nmemb);
return size*nmemb;
}
};
您可能需要查看 C ++ REST SDK （代号<！>“; Casablanca <！> QUOT）。 http://msdn.microsoft.com/en-us/library/jj950081。 ASPX
使用C ++ REST SDK，您可以更轻松地从C ++应用程序连接到HTTP服务器。
用法示例：
#include <iostream>
#include <cpprest/http_client.h>
using namespace web::http; // Common HTTP functionality
using namespace web::http::client; // HTTP client features
int main(int argc, char** argv) {
http_client client("http://httpbin.org/");
http_response response;
// ordinary `get` request
response = client.request(methods::GET, "/get").get();
std::cout << response.extract_string().get() << "\n";
// working with json
response = client.request(methods::GET, "/get").get();
std::cout << "url: " << response.extract_json().get()[U("url")] << "\n";
}
C ++ REST SDK是一个Microsoft项目，使用现代异步C ++ API设计，在本机代码中进行基于云的客户端 - 服务器通信。
通过这个答案，我可以参考 Software_Developer的答案。通过重建代码，我发现某些部分已弃用（gethostbyname()）或不提供错误处理（创建套接字，发送内容）以进行操作。
使用Visual Studio 2013和Windows 8.1 64位以及Windows 7 64位测试以下 Windows代码。它将以www.google.com的Web服务器为目标进行IPv4 TCP连接。
#include <winsock2.h>
#include <WS2tcpip.h>
#include <windows.h>
#include <iostream>
#pragma comment(lib,"ws2_32.lib")
using namespace std;
int main (){
// Initialize Dependencies to the Windows Socket.
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
cout << "WSAStartup failed.\n";
system("pause");
return -1;
}
// We first prepare some "hints" for the "getaddrinfo" function
// to tell it, that we are looking for a IPv4 TCP Connection.
struct addrinfo hints;
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_INET; // We are targeting IPv4
hints.ai_protocol = IPPROTO_TCP; // We are targeting TCP
hints.ai_socktype = SOCK_STREAM; // We are targeting TCP so its SOCK_STREAM
// Aquiring of the IPv4 address of a host using the newer
// "getaddrinfo" function which outdated "gethostbyname".
// It will search for IPv4 addresses using the TCP-Protocol.
struct addrinfo* targetAdressInfo = NULL;
DWORD getAddrRes = getaddrinfo("www.google.com", NULL, &hints, &targetAdressInfo);
if (getAddrRes != 0 || targetAdressInfo == NULL)
{
cout << "Could not resolve the Host Name" << endl;
system("pause");
WSACleanup();
return -1;
}
// Create the Socket Address Informations, using IPv4
// We dont have to take care of sin_zero, it is only used to extend the length of SOCKADDR_IN to the size of SOCKADDR
SOCKADDR_IN sockAddr;
sockAddr.sin_addr = ((struct sockaddr_in*) targetAdressInfo->ai_addr)->sin_addr; // The IPv4 Address from the Address Resolution Result
sockAddr.sin_family = AF_INET; // IPv4
sockAddr.sin_port = htons(80); // HTTP Port: 80
// We have to free the Address-Information from getaddrinfo again
freeaddrinfo(targetAdressInfo);
// Creation of a socket for the communication with the Web Server,
// using IPv4 and the TCP-Protocol
SOCKET webSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (webSocket == INVALID_SOCKET)
{
cout << "Creation of the Socket Failed" << endl;
system("pause");
WSACleanup();
return -1;
}
// Establishing a connection to the web Socket
cout << "Connecting...\n";
if(connect(webSocket, (SOCKADDR*)&sockAddr, sizeof(sockAddr)) != 0)
{
cout << "Could not connect";
system("pause");
closesocket(webSocket);
WSACleanup();
return -1;
}
cout << "Connected.\n";
// Sending a HTTP-GET-Request to the Web Server
const char* httpRequest = "GET / HTTP/1.1\r\nHost: www.google.com\r\nConnection: close\r\n\r\n";
int sentBytes = send(webSocket, httpRequest, strlen(httpRequest),0);
if (sentBytes < strlen(httpRequest) || sentBytes == SOCKET_ERROR)
{
cout << "Could not send the request to the Server" << endl;
system("pause");
closesocket(webSocket);
WSACleanup();
return -1;
}
// Receiving and Displaying an answer from the Web Server
char buffer[10000];
ZeroMemory(buffer, sizeof(buffer));
int dataLen;
while ((dataLen = recv(webSocket, buffer, sizeof(buffer), 0) > 0))
{
int i = 0;
while (buffer[i] >= 32 || buffer[i] == '\n' || buffer[i] == '\r') {
cout << buffer[i];
i += 1;
}
}
// Cleaning up Windows Socket Dependencies
closesocket(webSocket);
WSACleanup();
system("pause");
return 0;
}
<强>参考文献：
C ++没有提供任何直接的方法。它完全取决于您拥有的平台和库。
在最坏的情况下，您可以使用boost :: asio库建立TCP连接，发送HTTP标头（RFC 2616），并直接解析响应。查看您的应用程序需求，这很简单。
C和C ++没有HTTP的标准库，甚至没有套接字连接。多年来，一些便携式库已经开发出来。正如其他人所说，使用最广泛的是 libcurl 。
以下是libcurl替代品的列表（来自libcurl的网站） ）。
此外，对于Linux，此是一个简单的HTTP客户端。您可以实现自己的简单HTTP GET客户端，但如果涉及身份验证或重定向，或者您需要在代理后面工作，则无法运行。对于这些情况，您需要一个像libcurl这样的完整库。
对于libcurl的源代码，这个是最接近你想要的（Libcurl有很多例子）。看看主要功能。成功连接后，html内容将被复制到缓冲区。只需用您自己的函数替换parseHtml。
您可以使用 embeddedRest 库。它是轻量级的仅限头库。因此很容易将它包含在您的项目中，并且不需要编译，因为其中没有.cpp文件。
来自repo的readme.md请求示例：
#include "UrlRequest.hpp"
//...
UrlRequest request;
request.host("api.vk.com");
const auto countryId=1;
const auto count=1000;
request.uri("/method/database.getCities",{
{"lang","ru"},
{"country_id",countryId},
{"count",count},
{"need_all","1"},
});
request.addHeader("Content-Type: application/json");
auto response=std::move(request.perform());
if(response.statusCode()==200){
cout<<"status code = "<<response.statusCode()<<", body = *"<<response.body()<<"*"<<endl;
}else{
cout<<"status code = "<<response.statusCode()<<", description = "<<response.statusDescription()<<endl;
}
HTTP协议非常简单，因此编写HTTP客户端非常简单。 这是一个
https://github.com/pedro-vicente/lib_netsockets
它使用HTTP GET从Web服务器检索文件，服务器和文件都是命令行参数。远程文件保存到本地副本。
免责声明：我是作者
编辑：已修改的网址
以下是一些无需使用任何第三方库即可使用的代码： 首先定义您需要发送到此特定服务器的网关，用户，密码和任何其他参数。
#define USERNAME "user"
#define PASSWORD "your password"
#define GATEWAY "your gateway"
以下是代码本身：
HINTERNET hOpenHandle, hResourceHandle, hConnectHandle;
const TCHAR* szHeaders = _T("Content-Type:application/json; charset=utf-8\r\n");
hOpenHandle = InternetOpen(_T("HTTPS"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
if (hOpenHandle == NULL)
{
return false;
}
hConnectHandle = InternetConnect(hOpenHandle,
GATEWAY,
INTERNET_DEFAULT_HTTPS_PORT,
NULL, NULL, INTERNET_SERVICE_HTTP,
0, 1);
if (hConnectHandle == NULL)
{
InternetCloseHandle(hOpenHandle);
return false;
}
hResourceHandle = HttpOpenRequest(hConnectHandle,
_T("POST"),
GATEWAY,
NULL, NULL, NULL, INTERNET_FLAG_SECURE | INTERNET_FLAG_KEEP_CONNECTION,
1);
if (hResourceHandle == NULL)
{
InternetCloseHandle(hOpenHandle);
InternetCloseHandle(hConnectHandle);
return false;
}
InternetSetOption(hResourceHandle, INTERNET_OPTION_USERNAME, (LPVOID)USERNAME, _tcslen(USERNAME));
InternetSetOption(hResourceHandle, INTERNET_OPTION_PASSWORD, (LPVOID)PASSWORD, _tcslen(PASSWORD));
std::string buf;
if (HttpSendRequest(hResourceHandle, szHeaders, 0, NULL, 0))
{
while (true)
{
std::string part;
DWORD size;
if (!InternetQueryDataAvailable(hResourceHandle, &size, 0, 0))break;
if (size == 0)break;
part.resize(size);
if (!InternetReadFile(hResourceHandle, &part[0], part.size(), &size))break;
if (size == 0)break;
part.resize(size);
buf.append(part);
}
}
if (!buf.empty())
{
// Get data back
}
InternetCloseHandle(hResourceHandle);
InternetCloseHandle(hConnectHandle);
InternetCloseHandle(hOpenHandle);
这应该适用于Win32 API环境。
以下是示例
这是一些（相对）简单的C ++ 11代码，它使用libCURL将URL的内容下载到std::vector<char>：
http_download.hh
# pragma once
#include <string>
#include <vector>
std::vector<char> download(std::string url, long* responseCode = nullptr);
http_download.cc
#include "http_download.hh"
#include <curl/curl.h>
#include <sstream>
#include <stdexcept>
using namespace std;
size_t callback(void* contents, size_t size, size_t nmemb, void* user)
{
auto chunk = reinterpret_cast<char*>(contents);
auto buffer = reinterpret_cast<vector<char>*>(user);
size_t priorSize = buffer->size();
size_t sizeIncrease = size * nmemb;
buffer->resize(priorSize + sizeIncrease);
std::copy(chunk, chunk + sizeIncrease, buffer->data() + priorSize);
return sizeIncrease;
}
vector<char> download(string url, long* responseCode)
{
vector<char> data;
curl_global_init(CURL_GLOBAL_ALL);
CURL* handle = curl_easy_init();
curl_easy_setopt(handle, CURLOPT_URL, url.c_str());
curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, callback);
curl_easy_setopt(handle, CURLOPT_WRITEDATA, &data);
curl_easy_setopt(handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
CURLcode result = curl_easy_perform(handle);
if (responseCode != nullptr)
curl_easy_getinfo(handle, CURLINFO_RESPONSE_CODE, responseCode);
curl_easy_cleanup(handle);
curl_global_cleanup();
if (result != CURLE_OK)
{
stringstream err;
err << "Error downloading from URL \"" << url << "\": " << curl_easy_strerror(result);
throw runtime_error(err.str());
}
return move(data);
}
通常我会推荐像cURL，POCO或Qt这样的跨平台的东西。但是，这是一个Windows示例！：
#include <atlbase.h>
#include <msxml6.h>
#include <comutil.h> // _bstr_t
HRESULT hr;
CComPtr<IXMLHTTPRequest> request;
hr = request.CoCreateInstance(CLSID_XMLHTTP60);
hr = request->open(
_bstr_t("GET"),
_bstr_t("https://www.google.com/images/srpr/logo11w.png"),
_variant_t(VARIANT_FALSE),
_variant_t(),
_variant_t());
hr = request->send(_variant_t());
// get status - 200 if succuss
long status;
hr = request->get_status(&status);
// load image data (if url points to an image)
VARIANT responseVariant;
hr = request->get_responseStream(&responseVariant);
IStream* stream = (IStream*)responseVariant.punkVal;
CImage *image = new CImage();
image->Load(stream);
stream->Release();
请注意，这不需要libcurl，Windows.h或WinSock！没有库的编译，没有项目配置等。我在Windows 10上的Visual Studio 2017 c ++中使用此代码：
#pragma comment(lib, "urlmon.lib")
#include <urlmon.h>
#include <sstream>
using namespace std;
...
IStream* stream;
//Also works with https URL's - unsure about the extent of SSL support though.
HRESULT result = URLOpenBlockingStream(0, "http://google.com", &stream, 0, 0);
if (result != 0)
{
return 1;
}
char buffer[100];
unsigned long bytesRead;
stringstream ss;
stream->Read(buffer, 100, &bytesRead);
while (bytesRead > 0U)
{
ss.write(buffer, (long long)bytesRead);
stream->Read(buffer, 100, &bytesRead);
}
stream.Release();
string resultString = ss.str();
我只是弄清楚如何做到这一点，因为我想要一个简单的API访问脚本，像libcurl这样的库导致了各种各样的问题（即使我按照指示......），而且WinSock太低了 - 水平和复杂。
我不太确定所有 IStream 阅读代码（特别是条件 - 随时纠正/改进），但是，嘿，它的工作，无忧无虑！ （这对我来说很有意义，因为我使用了阻止（同步）呼叫，这没关系，bytesRead总是<！> gt; 0U直到流（ ISequentialStream ？）已完成阅读，但谁知道。）
参见： URL Monikers and Asynchronous Pluggable Protocol Reference
虽然有点晚了。您可能更喜欢 https://github.com/Taymindis/backcurl 。
它允许您在移动c ++开发上进行http调用。适合手机游戏开发
bcl::init(); // init when using
bcl::execute<std::string>([&](bcl::Request *req) {
bcl::setOpts(req, CURLOPT_URL , "http://www.google.com",
CURLOPT_FOLLOWLOCATION, 1L,
CURLOPT_WRITEFUNCTION, &bcl::writeContentCallback,
CURLOPT_WRITEDATA, req->dataPtr,
CURLOPT_USERAGENT, "libcurl-agent/1.0",
CURLOPT_RANGE, "0-200000"
);
}, [&](bcl::Response * resp) {
std::string ret = std::string(resp->getBody<std::string>()->c_str());
printf("Sync === %s\n", ret.c_str());
});
bcl::cleanUp(); // clean up when no more using
如果您正在寻找C ++中支持多个平台（Linux，Windows和Mac）的HTTP客户端库，以便使用Restful Web服务。您可以选择以下选项。
- QT网络库 - 允许应用程序发送网络请求并接收答复
- C ++ REST SDK - 支持PPL的新兴第三方HTTP库
- Libcurl - 它可能是本地世界最常用的http lib之一。
您可以使用ACE来执行此操作：
#include "ace/SOCK_Connector.h"
int main(int argc, ACE_TCHAR* argv[])
{
//HTTP Request Header
char* szRequest = "GET /video/nice.mp4 HTTP/1.1\r\nHost: example.com\r\n\r\n";
int ilen = strlen(szRequest);
//our buffer
char output[16*1024];
ACE_INET_Addr server (80, "example.com");
ACE_SOCK_Stream peer;
ACE_SOCK_Connector connector;
int ires = connector.connect(peer, server);
int sum = 0;
peer.send(szRequest, ilen);
while (true)
{
ACE_Time_Value timeout = ACE_Time_Value(15);
int rc = peer.recv_n(output, 16*1024, &timeout);
if (rc == -1)
{
break;
}
sum += rc;
}
peer.close();
printf("Bytes transffered: %d",sum);
return 0;
}
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