C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  FILE *fd to string          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message va Guest Posted: Mon May 07, 2007 11:25 pm    Post subject: FILE *fd to string I have a C style function which is of the form writestuff(FILE *fd). Now this function writes strings to the FILE* provided. Is there a way to collect this output into a string (without the obvious creating and reading of a temp file?). I just want the output of the 'writestuff' function to be collected into a std::string. I can't modify the writestuff function to do the needful. Any suggestions? Thanks, -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Sebastian Redl Guest Posted: Tue May 08, 2007 1:05 am    Post subject: Re: FILE *fd to string On Mon, 7 May 2007, va wrote: Quote: I have a C style function which is of the form writestuff(FILE *fd). Now this function writes strings to the FILE* provided. Is there a way to collect this output into a string (without the obvious creating and reading of a temp file?). I just want the output of the 'writestuff' function to be collected into a std::string. I can't modify the writestuff function to do the needful. Any suggestions? Thanks, Not in a portable way, as FILE is opaque. There are some non-portable ways. For example, with knowledge of your CRT, you can construct a FILE structure that writes into a memory buffer. (That's what the MS CRT does for sprintf, for example.) With knowledge of your platform, you can e.g. create a POSIX pipe and use fdopen() to turn the write end of the pipe into a FILE*, then read the strings from the other end. But nothing portable, I'm afraid. Sebastian Redl -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top        C++Talk.NET Forum Index -> C++ Language (Moderated) All times are GMT Page 1 of 1 Powered by phpBB © 2001, 2006 phpBB Group