get_file

template<class Agent>
api_result<file_t, Agent&&> get_file(Agent &&agent, get_file_args_t args)

template<class Agent, class F>
void get_file(Agent &&agent, get_file_args_t args, F &&callback)

agent is any object satisfying agent concept.

callback is any callable object accepting expected<file_t>.

Use this method to get basic information about a file and prepare it for downloading. For the moment, bots can download files of up to 20MB in size. On success, a File object is returned. The file can then be downloaded via the link https://api.telegram.org/file/bot<token>/<file_path>, where <file_path> is taken from the response. It is guaranteed that the link will be valid for at least 1 hour. When the link expires, a new one can be requested by calling getFile again.

struct get_file_args_t

Arguments that should be passed to get_file().

string_t file_id

File identifier to get information about