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Groups > comp.os.linux.development.apps > #170

Re: reading a temp file in C++

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On Tue, 28 Jun 2011 08:33:43 +0000, Ruben Safir wrote:

> any clue why this isn't retrieving the contents of the temp file

It appears you create and open a temp file via fd = mkstemp(path);, 
then invoke vi via system(editor);, and finally read and print
from fd.  I presume that when user saves file and exits vi, that
in effect vi writes a new temp file, renames the original temp file,
and renames the new temp file.  If so, fd contents don't change.
 
> Question Deck::create_question(WINDOW* menu_win, std::ostream &os
> ,std::istream &in ){
>       
>       char default_editor[20000] = "vi ";
>       char * editor;
>       char tmp[4096];
>       char path[] = "/tmp/fileXXXXXX";
>       int fd;
>       fd = mkstemp(path);
>       editor = getenv("EDITOR");
>       if (editor == NULL){
> 	 editor  = default_editor;
>       }
> 
>       strcat(editor, path);
>       char quest_prompt[] = "Edit Your Question";
> ....
>       std::string input_q, input_a;
>       while( ( c=wgetch(quest_win) ) ){
> 	 if ( (c == 10) ){
> 	    def_prog_mode();
> 	    endwin();
> 	    system(editor);
> 	    reset_prog_mode();
> 	     __gnu_cxx::stdio_filebuf< char>  tmpfile_buf(fd,
> 	     std::ios::binary|std::ios::app); std::istream is(&tmpfile_buf);
> 	     is.seekg(0, std::ios::beg);
> 	     while(is){
> 		is.read( tmp, 4096);
> 		std::cerr << "What did we read" << tmp << std::endl; input_q = tmp;
> 	     }
> 	     tmpfile_buf.close();
> 	     break;
> 	 }
>       }
>       remove(path);

-- 
jiw

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reading a temp file in C++ Ruben Safir <ruben@mrbrklyn.com> - 2011-06-28 08:33 +0000
  Re: reading a temp file in C++ Richard Kettlewell <rjk@greenend.org.uk> - 2011-06-28 09:46 +0100
  Re: reading a temp file in C++ James Waldby <not@valid.invalid> - 2011-06-28 15:58 +0000
    Re: reading a temp file in C++ jt@toerring.de (Jens Thoms Toerring) - 2011-06-28 21:17 +0000
      Re: reading a temp file in C++ ruben safir <ruben@mrbrklyn.com> - 2011-06-30 03:06 +0000

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