Re: [Iup-users] In C: IupGetText / IupText with MULTILINE=YES question - how to set maximum input length?

[Antonio S. <sc...@te...>]

  This is a bug in NC. As a workaround you can set NC after the dialog is
mapped that it will work.

Best,
scuri

> -----Original Message-----
> From: Stefan Giesen [mailto:ig...@ro...]
> Sent: terça-feira, 23 de fevereiro de 2010 15:00
> To: IUP Users Mailing List
> Subject: [Iup-users] In C: IupGetText / IupText with MULTILINE=YES
> question - how to set maximum input length?
> 
> Hi all,
> 
> I just started with IUP (I downloaded the current release 3.0 from SF
> yesterday) and I wasn't able to find anything in the documentation
> and/or
> mailing list about how to set the maximum keyboard input length for
> IupText
> with MULTILINE=YES (and for the predefined dialog IupGetText, for that
> matter).
> 
> If I use IupText with MULTILINE=NO, I can set the maximum keyboard
> input
> length with NC=<length> (e.g. "NC=20" for 20 characters). This is fine
> to
> prevent input buffer overflows if I use IupSetAttribute for the VALUE
> field
> with my own text buffer pointer (as long as you remember the '\0' at
> the
> end of the string, which means that the text buffer has to have 21
> characters if you need 20 characters).
> 
> But when I use the multi-line mode of IupText, the "NC" attribute is
> completely ignored (and if I check it after displaying the dialog,
> there
> are strange values in it, like e.g. 136705248 or 136723456, see below).
> I've appended my little test program (which uses nearly the same code
> as
> used in iup_predial.c for IupGetText).
> 
> If you comment out line 25:
> 
>   IupSetAttribute(multi_text, "MULTILINE", "YES");
> 
> everything works as expected, you can't input more than 20 characters
> in
> the dialog.
> 
> But if multi-line mode is used, you can enter as much text as you want
> in
> the text area (and the program segfaults immediately after clicking
> "OK" -
> as to be expected, since my text input buffer only has 21 bytes):
> 
> $ ./test1
> NC=136705248
> Segmentation fault
> $ ./test1
> NC=136723456
> Segmentation fault
> 
> Is there any possibility to specify the maximum keyboard input in
> multi-line mode? I'm quite sure it's not a good idea to maximize my via
> malloc allocated text buffer to 2^31 characters to prevent segfaults...
> 8-)
> 
> Yes, I know that I could have used IupStoreAttribute (instead of
> IupSetAttribute with a pointer to my own text buffer) for VALUE and
> used
> strncpy with my maximum length instead of strcpy after the dialog was
> closed - but I think this would be bad behavior regarding user
> usability:
> the user was able to enter 1000 characters and the result he gets into
> the
> program is just 20 characters after closing the dialog... He will
> think:
> what the hell is going on? If the program only wants 20 characters in
> multi-line, I should be able to configure that in IUP (and the problem
> with
> IupGetText would be still the same, because i can't do anything about
> the
> buffer, see iuppredial.c).
> 
> Is there maybe something I have missed in the documentation? Or is this
> a
> bug/missing feature in IUP?
> 
> Thanks in advance,
> Stefan
> 
> 
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