c++ run curl in shell via system - c++

Question

If I write this in my shell, everything works like a charme:
// shell (unix)
curl -X PUT -d "{ \"string\" : \"my string 1212 \"}" "https://my.firebaseio.com/myVal.json"
As you can tell, this inserts some stuff in my firebase. As mentioned above, this works as expected. Since I am not too deep in C++, I have no idea on how to PUT curl-requests internally. I was thinking about doing it in the shell via system.
I ended up with this:
// c++ code
system('curl -X PUT -d "{ \"string\" : \"my string 1212 \"}" "https://my.firebaseio.com/myVal.json" ');
This however produces this output:
curl: (6) Could not resolve host:
curl: (6) Could not resolve host: CD
curl: (7) Could not resolve host: CD
curl: (3) [globbing] unmatched close brace/bracket in column 1
Thanks for any helpful advices
// Update 1
After hearing that single quotes ' are reserved for chars and going for the solution erip provided, it is still the same output:
curl: (6) Could not resolve host:
curl: (6) Could not resolve host: cd
curl: (7) Could not resolve host: cd
curl: (3) [globbing] unmatched close brace/bracket in column 1
{
"error" : "Invalid data; couldn't parse JSON object, array, or value. Perhaps you're using invalid characters in your key names."
}

Answer 1

In C++, single quotes are used for the type char. Double quotes are reserved for std::strings or char *s.
Thus, your solution should be by simply replacing single quotes with double quotes and escaping the quotes that aren't your final quote:
system("curl -X PUT -d \"{ \"string\" : \"my string 1212 \"}\" https://my.firebaseio.com/myVal.json ");
However, like #DaoWen mentioned, always use a library if/when possible.
EDIT
I'd recommend trying this:
std::string command = "curl -X PUT -d \"{ \"string\" : \"my string 1212 \"}\" https://my.firebaseio.com/myVal.json ";
system(command.c_str());
But honestly, it's better to use fork and exec calls than system calls if you don't want to use libcurl.
EDIT 2
std::string command = "curl -H \"Content-Type: application/json\" -X PUT -d '{ \"string\" : \"my string 1212 \"}' https://my.firebaseio.com/myVal.json";
system(command.c_str());
The weird escaped quotes were treating key: "string" as the host because { was surrounded by quotes, acting as the data. I fixed this by surrounding the data to be passed with a single quote.
You can see that I PUT { "Hello" : "World!" } to your app here.
Hope this helped.