No matching function for call to ‘curl::curl_easy::curl_easy(curl::curl_ios<std::__cxx11::basic_ostringstream<char> >&)' about curlcpp

[JosephP91]

Hi @foreverska !
You can still initialize a curl_easy object with a curl_ios instance. What kind of problem you encountered?
For example:

#include "curl_easy.h"
#include "curl_form.h"
#include "curl_exception.h"
#include "curl_header.h"

using curl::curl_header;
using curl::curl_easy;
using std::ostringstream;

int main() {
    ostringstream str;
    // Let's create an object which will contain a list of headers.
    curl_header header;
    // Easy object to handle the connection.
    curl_ios<ostringstream> ios(str);
    curl_easy easy(ios);

    // Add custom headers.
    header.add("Accept:");
    header.add("Another:yes");
    header.add("Host: example.com");

    // Add the headers to the easy object.
    easy.add<CURLOPT_HTTPHEADER>(header.get());

    easy.add<CURLOPT_URL>("http://www.example.com");
    //easy.add<CURLOPT_VERBOSE>(1L);
    try {
        // Request execution
        easy.perform();
    } catch (curl_easy_exception error) {
        // If you want to get the entire error stack we can do:
        curlcpp_traceback errors = error.get_traceback();
        // Otherwise we could print the stack like this:
        error.print_traceback();
    }
    cout<<str.str()<<endl;
    return 0;
}

[foreverska]

The error which titles this issue happens when I try to compile the example to put the response in a variable given in the README and my own code which at the time was modeled directly after it. g++ goes on to list the possible function candidates none of which are close to initialization with a curl_ios instance.

[JosephP91]

@foreverska Ok, can you post the piece of code where you are initializing curl_easy and declaring curl_ios?

[foreverska]

For testing I copied and pasted the code provided in the README (the 4th Simple Usage Example) into a local file called test.cpp file and compiled it and here is the output:

adam@adam-PC:~/Documents/Programming/config/neo4j$ g++ -std=c++11 src/test.cpp -I inc/ -I ../../vendor/curlcpp/include/ -L ../../vendor/curlcpp/build/src/ -lcurlcpp -lcurl
src/test.cpp: In function ‘int main()’:
src/test.cpp:13:26: error: no matching function for call to ‘curl::curl_easy::curl_easy(curl::curl_ios<std::__cxx11::basic_ostringstream<char> >&)’
     curl_easy easy(writer);
                          ^
In file included from src/test.cpp:1:0:
../../vendor/curlcpp/include/curl_easy.h:893:9: note: candidate: curl::curl_easy::curl_easy(const curl::curl_easy&)
         curl_easy(const curl_easy &);
         ^
../../vendor/curlcpp/include/curl_easy.h:893:9: note:   no known conversion for argument 1 from ‘curl::curl_ios<std::__cxx11::basic_ostringstream<char> >’ to ‘const curl::curl_easy&’
../../vendor/curlcpp/include/curl_easy.h:888:18: note: candidate: curl::curl_easy::curl_easy(long int)
         explicit curl_easy(const long);
                  ^
../../vendor/curlcpp/include/curl_easy.h:888:18: note:   no known conversion for argument 1 from ‘curl::curl_ios<std::__cxx11::basic_ostringstream<char> >’ to ‘long int’
../../vendor/curlcpp/include/curl_easy.h:883:9: note: candidate: curl::curl_easy::curl_easy()
         curl_easy();
         ^
../../vendor/curlcpp/include/curl_easy.h:883:9: note:   candidate expects 0 arguments, 1 provided

[JosephP91]

@foreverska Holy cow! Two methods implementation were missing. I pushed a fix right now. Can you update your curlcpp local version and let me know if the problem is fixed?

[foreverska]

I did a pull and now test.cpp compiles and runs correctly.

I already migrated my code to the recv_header.cpp style code so all I can say about that is the push didn't break anything for me. But this will be very helpful for new people.

[JosephP91]

Very well! Thank you!