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 Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ Language (Moderated) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.