On Friday 25 January 2013 14:57:23 Rudra Banerjee wrote:
> Dear friends,
> as evident from my last few posts, I am struggling with opening a file
> as buffer and write to it
> (guess it has *nothing* to do with gtk, but C. Still I will be grateful
> if you people kindly help).
> So, first, how to open file in buffer?
>
> /* Files opened and edited directly*/
> /* FILE *fop = fopen(filename, "a" );
> if (!fop){
> filename="Untitled.bib";
> fop= fopen(filename,"a");
> }
> */
>
> /*Trying to open file as buffer and edit that*/
> FILE *fopf = fopen(filename, "a" );
> if (!fopf){
> filename="Untitled.bib";
> fopf= fopen(filename,"a");
> }
You have to open, read (and then close) the file into a static or malloced
buffer of sufficient size,
then you can operate on the buffer. When your are done you write out the buffer
to a newfile, delete the old and rename the new to old.
> char fop[]="Hello World";
> int buf_size= strlen(fop)+1;
> fwrite(fop,buf_size,1,fopf);
> if(!fop){
> printf("failed");
> }
> fclose(fopf);
>
> gtk_label_set_text(GTK_LABEL(flabel), filename);
> printf( fop, "@%s{%s,\n", strcombo, strkey );
> if( strlen(strAuth)!=0)
> printf( fop, "\tAuthor=\"%s\",\n", strAuth);
> if( strlen(strEditor)!=0)
> printf( fop, "\tEditor=\"%s\",\n", strEditor);
> if( strlen(strTitle)!=0)
> printf( fop, "\tTitle=\"%s\",\n", strTitle);
> // fclose(fop);
>
>
> The very first part of the code (commented) used to access the file
> directly, an approach that I was advised against. So I tried to open the
> file in buffer. But this implementation makes the program crash as soon
> as enter some value.
>
> Please help
>
PS.: at the first glance it seems to me you need a database backend
like sqlite to save, store, change and retrieve your data.
Ciao,
ZZ
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