no suitable user-defined conversion from utility::string_t to std::string

Question

I am using the casablanca C++ Rest library to make HTTP requests.

The problem is that this gives a utility::string_t string as output and I can't quite find any way to convert this to a classic std::string. Any ideas?

client.request(methods::GET).then([](http_response response)
{
  if(response.status_code() == status_codes::OK)
  {
    string_t s = response.extract_string().get();
  }
});

Isn't utility::string_t a typedef for std::string? Where's the problem? — KABoissonneault, Jul 07 '15 at 13:28
For reference, http://casablanca.codeplex.com/discussions/572948 — Rami A., Jan 30 '17 at 23:31
So last REST SDK have some type problmes, if you work with. latest versions have: typedef std::wstring string_t; — Nick Nikolaev, Nov 22 '15 at 15:19

score 11 · Answer 1 · answered Feb 02 '16 at 08:26

11

Depending on what platform you are compiling for, the utility::string_t type will be typedef'd to either std::wstring (on Windows) or std::string (on Linux/OSX).

To get a classic utf-8 std::string regardless of platform, take a look at utility::conversions::to_utf8string.

reference documentation

answered Feb 02 '16 at 08:26

roschuma

536
4
7

1

This is the only thing tat worked for me on Windows, with C++ REST SDK 2.7.0. The utility::string_t from using value.as_string() was not accepted as std::string. – arie Feb 12 '16 at 09:23

score 2 · Accepted Answer · answered Jul 07 '15 at 13:35

2

If you see the documentation for C++ REST SDK from github, you'll find a typedef

C++ Rest SDK - utility Namespace Reference

typedef std::string     string_t;

So no need to convert it. Both are same types.

answered Jul 07 '15 at 13:35

Shreevardhan

12,233
3
36
50

5

This only applies on non-Windows. On Windows, this typedef looks like `typedef std::wstring string_t;` – roschuma Mar 28 '16 at 21:54
6

utility does support the function like `utility::conversions::to_utf8string` – Han Apr 10 '16 at 03:44

score 2 · Answer 3 · answered Mar 03 '16 at 14:18

On Windows Phone 8.1 there is this define:

typedef std::wstring     string_t;

I used this:

string_t toStringT = U("sample");
std::string fromStringT(toStringT.begin(), toStringT.end());

or:

std::string fromStringT(conversions::to_utf8string(toStringT));

no suitable user-defined conversion from utility::string_t to std::string

3 Answers3

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