带有curl C ++的动态URL

Question

Here is my C++ code for curl GET query (in QT5)

CURL *curl;
CURLcode res;
curl = curl_easy_init();

curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/?site=http://google.fr&name=test");
curl_easy_setopt(curl, CURLOPT_USERAGENT, "curl/7.42.0");

This code works perfectly! the request is launched.

I would like to change the path of the field of the application.
I get the domain by this variable

QString domain = ui->editDomain->text();

I tried:

curl_easy_setopt(curl, CURLOPT_URL, domain + "?site=http://google.fr&name=test");

But here the query is not launching! And I do not understand why... And no error at compilation

Answer 1

curl functions take a c-string. domain + "?site=http://google.fr&name=test" gives you a QString which the function doesn't know how to handle. What you need to do is convert the resulting QString into a c-string. You can do that like

curl_easy_setopt(curl, CURLOPT_URL, (domain + "?site=http://google.fr&name=test").toUtf8().constData());