Get page contents in C++ - c++

Question

I've created a PHP and C# app that gets the users Xbox 360 Profile ID from their gamertag.
I was just wondering how I do a web request and put the page contents of the url into a string in C++.
Thanks.

Answer 1

Here's a down-and-dirty C++ HTTP fetcher I wrote using libCURL some time back.
It takes a URL and returns a string with the contents of a get request. Modify and flavor to taste:
/*
* HttpFetcher.h
*/
#ifndef _http_fetcher_
#define _http_fetcher_
#include <stdlib.h>
#include <string>
class HttpFetcher {
public:
std::string simpleGetRequest(std::string url);
private:
// Private methods to handle getting
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data);
};
#endif // ifndef _http_fetcher_
/*
* HttpFetcher.cpp
* Much of this is quite similar to examples on the libcURL site
*/
#include "HttpFetcher.h"
#include "curl.h"
#include "easy.h"
#include <iostream>
size_t HttpFetcher::WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)data;
mem->memory = (char*)realloc(mem->memory, mem->size + realsize + 1);
if (mem->memory == NULL) {
/* out of memory! */
printf("not enough memory (realloc returned NULL)\n");
exit(EXIT_FAILURE);
}
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
std::string HttpFetcher::simpleGetRequest(std::string url)
{
std::string toReturn = "";
CURL *curl = NULL;
struct MemoryStruct chunk;
chunk.memory = (char*)malloc(1);
chunk.size = 0;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteMemoryCallback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)&chunk);
// Some requests fail without a user agent.
curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
toReturn = std::string(chunk.memory);
}
free(chunk.memory);
return toReturn;
}