Posting String To Web Server, Get Response - c++

Question

I have a long base64 encoded text string. It's about 1024 characters. From my Objective C code, I want to send it to my PHP script, have it dump it to a log, and return an "OK" response back. I tried this cookbook example, but it only has an example of upload and download (not both combined), and it doesn't even work in my case.
I'd be willing to switch this to a C++ solution if I knew how.
The Objective C Client Code (command line client)
NSString *sMessage = #"My Long Base64 Encoded Message";
NSString *sURL = "http://example.com/request.php";
NSURL *oURL = [NSURL URLWithString:sURL];
NSData *data = [NSData dataWithBytes:sMessage.UTF8String length:sMessage.length];
NSURLSessionDataTask *downloadTask = [[NSURLSession sharedSession]
dataTaskWithURL:oURL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(#"\n\nDATA\n\n%#",data);
NSLog(#"\n\nRESPONSE\n\n%#",response);
NSLog(#"\n\nERROR\n\n%#",error);
}];
[downloadTask resume];
The PHP Web Server Code
<?php
error_reporting(E_ALL);
ini_set('display_errors','On');
$sRaw = file_get_contents('php://input');
file_put_contents('TEST.TXT',$sRaw);
die('OK');

Answer 1

There's a far easier route using ordinary C++. You'll have to convert your .m file to a .mm file in order to be able to mix Objective C and C++ code.
The PHP code is good and doesn't require a revision. Here's the C++ example I used that worked. It used the STL and curl. I was doing this on a Mac, and by default OSX has the curl libraries pre-installed. Note that the example below is synchronous -- it jams program execution until the server call is completed. (I desired this in my case -- you may not.)
The C++ Client Code (class)
#pragma once
#include <string>
#include <sstream>
#include <iostream>
#include <curl/curl.h>
class Webby {
public:
static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream) {
std::string buf = std::string(static_cast<char *>(ptr), size * nmemb);
std::stringstream *response = static_cast<std::stringstream *>(stream);
response->write(buf.c_str(), (std::streamsize)buf.size());
return size * nmemb;
}
static std::string sendRawHTTP(std::string sHostURL, std::string &sStringData) {
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if (curl) {
std::stringstream response;
curl_easy_setopt(curl, CURLOPT_URL, sHostURL.c_str());
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, sStringData.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, Webby::write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
return response.str();
}
return "";
}
}; // end class