Extract specific data from webpage - c++

Question

Basically this is my code :
int main()
{
CURL *curl;
FILE *fp;
CURLcode res;
std::string readBuffer;
curl = curl_easy_init();
char outfilename[FILENAME_MAX] = "C:\\Users\\admin\\desktop\\test.txt";
if(curl) {
fp = fopen(outfilename,"wb");
curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com");
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "user=123&pass=123");
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl);
Sleep(1000);
curl_easy_cleanup(curl);
fclose(fp);
}
return EXIT_SUCCESS;
}
The output is successfully saved in the text file.
My concern is how to extract specific content in between specific tags.
For example i want only the content between < bla> .............. < /bla> .
Whats the easiest way and thank you.

Answer 1

In your Example, you are dumping the response from the website to a file, libcURL writes the data returned by the webpage that you hit as it is, it does not take efforts for restructuring the returned data.
You can obtain the data in a memory, by defining the write_data function, which needs the following format only:
size_t write_data(char *ptr, size_t size, size_t nmemb, void *userdata);
Once you get the data in a memory, you can parse it and restructure it as required.
See Example Here for using write_data function.
For XML Parsing you may use This sample code