Re: [perl-win32-gui-users] Rich text field

[Sean H. <jal...@ho...>]

> I have already tried it, but I cannot store more than 32 KB of text in=
 a
> Richedit field (using Win32::GUI::Richedit).
> Those 32 kb of text takes around 48 kb of rich text, but it cannot sto=
re
> more than that.
>
> I have tried using the Load() and Save() methods  and I have also trie=
d
> creating the rich text manually and storing it in the field, but it  =

> doesn't
> allow more than 32 kb of text.

Look at the Win32::GUI::RidhEdit methods GetLimittext(), SetLimitText(),=
  =

and LimiteText().

An unfortunate misspelling on that last one; perhaps that can be fixed i=
n  =

a future version - as of 1.05 it's still LimiteText instead of LimitText=
  =

Of course, both names may need to be kept for several versions, so as no=
t  =

to break any code that's using the misspelled version.

Here's some more info on the text size limit:

EM_LIMITTEXT Message

The EM_LIMITTEXT message sets the text limit of an edit control. The tex=
t  =

limit is the maximum amount of text, in TCHARs, that the user can type  =

into the edit control. You can send this message to either an edit contr=
ol  =

or a rich edit control.

For edit controls and Microsoft Rich Edit 1.0, bytes are used. For Rich =
 =

Edit 2.0 and later, characters are used.

Syntax

To send this message, call the SendMessage function as follows. lResult =
=3D  =

SendMessage( 	    // returns LRESULT in lResult
    (HWND) hWndControl, 	    // handle to destination control
    (UINT) EM_LIMITTEXT, 	    // message ID
    (WPARAM) wParam, 	    // =3D (WPARAM) () wParam;
    (LPARAM) lParam 	    // =3D 0; not used, must be zero
); 	=



Parameters
wParam
Specifies the maximum number of TCHARs the user can enter. For ANSI text=
,  =

this is the number of bytes; for Unicode text, this is the number of  =

characters. This number does not include the terminating null character.=


Rich edit controls: If this parameter is zero, the text length is set to=
  =

64,000 characters.

Edit controls on Windows NT/2000/XP: If this parameter is zero, the text=
  =

length is set to 0x7FFFFFFE characters for single-line edit controls or =
-1  =

for multiline edit controls.

Edit controls on Windows 95/98/Me: If this parameter is zero, the text  =

length is set to 0x7FFE characters for single-line edit controls or 0xFF=
FF  =

for multiline edit controls.
lParam
This parameter is not used.

Return Value
This message does not return a value.

Remarks

The EM_LIMITTEXT message limits only the text the user can enter. It doe=
s  =

not affect any text already in the edit control when the message is sent=
,  =

nor does it affect the length of the text copied to the edit control by =
 =

the WM_SETTEXT message. If an application uses the WM_SETTEXT message to=
  =

place more text into an edit control than is specified in the EM_LIMITTE=
XT  =

message, the user can edit the entire contents of the edit control.

Before EM_LIMITTEXT is called, the default limit for the amount of text =
a  =

user can enter in an edit control is 32,767 characters.

Edit controls on Windows NT/2000/XP: For single-line edit controls, the =
 =

text limit is either 0x7FFFFFFE bytes or the value of the wParam  =

parameter, whichever is smaller. For multiline edit controls, this value=
  =

is either -1 byte or the value of the wParam parameter, whichever is  =

smaller.

Edit controls on Windows 95/98/Me: For single-line edit controls, the te=
xt  =

limit is either 0x7FFE bytes or the value of the wParam parameter,  =

whichever is smaller. For multiline edit controls, this value is either =
 =

0xFFFF bytes or the value of the wParam parameter, whichever is smaller.=


Rich Edit: Supported in Rich Edit 1.0 and later. Use the message  =

EM_EXLIMITTEXT for text length values greater than 64,000. For informati=
on  =

about the compatibility of rich edit versions with the various system  =

versions, see About Rich Edit Controls.

Message InformationHeader	Declared in Winuser.h, include Windows.h
Minimum operating systems	Windows 95, Windows NT 3.1


See Also
Edit Controls Overview, EM_EXLIMITTEXT, WM_SETTEXT