perl-win32-gui-users

[perl-win32-gui-users] Textfield overflow or buffer limit ??

[Jim S. <jb...@op...>]

Am using a TextField to display a log as it occurs.
Each time there is a new line for the log I do an
Append on the TextField.  Works fine except after
many entries it just stops and Hangs. It stops right in the
middle of a line being appended. It smells like there is some
internal buffer or table limit that I am running into. Can't find
any documentation or web discussion about this.

The TextField is readonly and multiline.

Running onWin XP, plenty of memory.

Any advice or info on this?

Thanks, jim salisbury

Re: [perl-win32-gui-users] Textfield overflow or buffer limit ??

[Robert M. <rm...@po...>]

Jim Salisbury wrote:
> Am using a TextField to display a log as it occurs.
> Each time there is a new line for the log I do an
> Append on the TextField.  Works fine except after
> many entries it just stops and Hangs. It stops right in the
> middle of a line being appended. It smells like there is some
> internal buffer or table limit that I am running into. Can't find
> any documentation or web discussion about this.
> 
> The TextField is readonly and multiline.
> 
> Running onWin XP, plenty of memory.
> 
> Any advice or info on this?

Under Win98 the Win32 Edit control used by Win32::GUI::Textfield is 
limited to about 32K bytes;  It can be increased to (about?) 64K bytes 
using the SetLimitText() method.

Under WinNT/2K/XP I can't find the default limit documented (it may be 
the same, but you can look using the GetLimitText() method). I think 
under these OS's it should be possible to increase the allowed size with 
SetLimitText() to several megabytes - Sorry, but I don't have a suitable 
machine at hand to try.

If you want more space than this, the try using the RichEdit class - it 
should be (almost) a drop in replacement for the Textfield, and IIRC the 
text limit can be increased to about 2GB.

Regards,
Rob.

Re: [perl-win32-gui-users] Textfield overflow or buffer limit ??

[Robert M. <rm...@po...>]

Robert May wrote:
> Under WinNT/2K/XP I can't find the default limit documented (it may be 
> the same, but you can look using the GetLimitText() method). I think 
> under these OS's it should be possible to increase the allowed size with 
> SetLimitText() to several megabytes - Sorry, but I don't have a suitable 
> machine at hand to try.

Default limit is same as Win98.

> If you want more space than this, the try using the RichEdit class - it 
> should be (almost) a drop in replacement for the Textfield, and IIRC the 
> text limit can be increased to about 2GB.

Need to add that you need to used the (mis-spelled) LimiteText() method 
to set the size to above 64K.

$richedit->LimiteText(2**31 - 1); appears to be the biggest you can make it.

Regards,
Rob.

Re: [perl-win32-gui-users] RicheEdit Missing Append() method [Was: Textfield overflow or buffer limit ??]

[Robert M. <rm...@po...>]

Jim Salisbury wrote:
 > I could not figure out how to use richedit as it does not have an
 > Append() method as does textfield.

For the RichEdit control, you can use:

   $richedit->SetSel(-1,-1);          # Move insertion point to the end
   $richedit->ReplaceSel($new_text);  # Insert at the insertion point

That's pretty much what the Textfield does behind it's Append() method.

Regards,
Rob.