在C ++中解析HTTP标头 [英] Parse HTTP headers in C++
问题描述
我正在使用curl与服务器进行通信.
I am using curl to communicate with a server.
当我请求数据时,我收到HTTP标头,后跟jpeg数据,并用边界分隔,如下所示:
When I make a request for data I receive the HTTP headers followed by jpeg data separated by a boundary like so:
我需要解析
- 边界字符串
- 内容长度.
我已将输入的数据复制到一个char数组中,如下所示:
I have copied the incoming data to a a char array like so:
static size_t OnReceiveData ( void * pvData, size_t tSize, size_t tCount, void * pvUser )
{
printf("%*.*s", tSize * tCount, tSize * tCount, pvData);
char* _data;
if(pvData != nullptr && 0 != tCount)
{
_data = new char[tCount];
memcpy(_data, pvData, tCount);
}
return ( tCount );
}
我怎样才能最好地用C ++做到这一点?我实际上如何检查并解析_data数组以获得所需的信息?例如,我可以使用任何增强库吗?
How can I best do this in C++?? How do I actually inspect and parse the _data array for the information that I want?? Are the any boost libraries that I can use for example??
推荐答案
您可以动态解析标头,也可以将标头放入地图中并在以后进行后处理.使用std :: string .查看 Boost字符串算法库,其中包含许多算法,例如修剪
You could parse the headers on the fly or put them into a map and post-process later.
Use find
, substr
methods from the std::string.
Look at Boost String Algorithms Library, it contains lots of algorithms, e.g. trim
例如将标头放入 std :: map
并将其打印(粗略显示):
e.g. to place headers into the std::map
and print them (rough cuts):
#include <stdlib.h>
#include <iostream>
#include <sstream>
#include <string>
#include <map>
#include <boost/algorithm/string.hpp>
int main(int argc, char* argv[]) {
const char* s = "HTTP/1.1 200 OK\r\n"
"Content-Type: image/jpeg; charset=utf-8\r\n"
"Content-Length: 19912\r\n\r\n";
std::map<std::string, std::string> m;
std::istringstream resp(s);
std::string header;
std::string::size_type index;
while (std::getline(resp, header) && header != "\r") {
index = header.find(':', 0);
if(index != std::string::npos) {
m.insert(std::make_pair(
boost::algorithm::trim_copy(header.substr(0, index)),
boost::algorithm::trim_copy(header.substr(index + 1))
));
}
}
for(auto& kv: m) {
std::cout << "KEY: `" << kv.first << "`, VALUE: `" << kv.second << '`' << std::endl;
}
return EXIT_SUCCESS;
}
您将获得输出:
KEY: `Content-Length`, VALUE: `19912`
KEY: `Content-Type`, VALUE: `image/jpeg; charset=utf-8`
有了标题,您可以提取所需的标题以进行后期处理.
Having the headers, you could extract the required ones for post-processing.
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