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User Guide




Release Date

13th February, 2008.

Summary of Changes

This is a summary of changes between V1.05 and V1.06 See the CHANGELOG file in the distribution for the full detail.

This release is a primarily a bug-fix release addressing the issues below. There are a small number of new features. Minor changes have been made to enable correct building with the new perl 5.10.0

Please note that this is intended to be the last release that is compatible with the Perl 5.6 series.

New Features

More constants

Win32::GUI::Constants now has over 2000 constants. Please keep reporting any that you need that are missing.

Win32::GUI::DC::DrawFrameControl can DFCS_ADJUSTRECT

DrawFrameControl() will now adjust it's input parameters if the DFCS_ADJUSTRECT flag is set and the input parameters are not readonly.

Dialog navigation for MDI Windows

Salvadore Oritz submitted a patch to allow 'TAB' navigation between controls of an MDI child window. The '-dialogui' is now functional on MDI child windows.

Confusion with GetParent() and TreeView windows

The GetParent() method usually gets the parent window, but for the Treeview class it gets the parent node:

  $parent_node = $tree_view->GetParent($node);

This made it difficult to get the parent window. Now, if the GetParent() method is called without an arguements it returns the parent window:

  $parent_window = $tree_view->GetParent();

Bug Fixes

Balloon Tooltip info and warning icons swapped

The info and warning icon for balloon tooltips were the wrong way round. This is fixed. (Tracker: 1709017)

Textfield::GetLine() truncates lines

Textfield::GetLine() has been re-written to stop it truncating lines, and to correctly return empty lines.

'-prompt' option to Textfield

The '-prompt' option to the Textfield constructor would generate warnings and place the label incorrectly when used to supply a label only:

  -prompt => 'Some Label:',

This should now be fixed. Note that if you were relying on the previouly incorrect placement (always against the left border), then you may need to re-position your labels. (Tracker: 1734697)

=item Warning During Global Destruction

It was common to get a warning like:

  (in cleanup) Can't call method "DELETE" on an undefined value at C:/Perl
  /site/lib/Win32/ line 3451 during global destruction.

This is now, hopefully, fixed. Please report if you still see errors like this.

Memory leaks

Various memory leaks have been resolved.

Win32::GUI::Scintilla buffer sizes

There were several places in the Scintilla wrapper code where buffers of the wrong sizes were allocated. This has been fixed.

Win32::GUI::Scroll return value

On failure Win32::GUI::Scroll was supposed to return undef, but was returning random garbage. This has been fixed, along with updates to the documentation.


There was a typo in the function name (LimiteText()). Both spellings are now supported.

ListView BeginLabelEdit event

The second argument was being set incorrectly when the callback was made. This is now fixed. (Tracker: 1706901)

ListView SelectedItems may now return an empty list

Win32::GUI::ListView::SelectedItems used to return undef when there were no items selected. It now returns an empty list, to better support things like:

  for my $item ($listview->SelectedItems()) {
    # do something with the selected $item
TreeView::GetItem may now return an empty list

Win32::GUI::TreeView::GetItem (and Win32::GUI::TreeView::ItemInfo) used to return undef when asked about a non-existing item. In now returns an empty list to better support things like:

  my %node_info = $treeview->GetItem($item);
Crash when destroying a window during a callback

It is possible to write code that destroys a window during one of it's one callbacks. This could crash perl. Hopefully this is now fixed.

All Win32::GUI::DC::Poly* drawing functions broken

Polygon(), PolyBezier(), PolyBezierTo(), PolyLine() and PolyLineTo() now all work.

Comboxbox constructor - using multiple types

The Win32::GUI::Combobox constructor has been updated to handle the '-simple', '-dropdown' and '-dropdownlist' options more intuatively. The docuentation has been updated to explain that only one of these options should be used, and what happens if more than one is used.

Win32::GUI::Imagelist::AddMasked broken

This call should now work. (Tracker: 1734697)

Win32::GUI::Acceptfiles() generates warning

The AcceptFiles() method was using some undefined constants. They have been removed.

Build process fixes

A number of warnings when building under cygwin were fixed - patches submitted by Reini Urban.

Win32::GUI::BitmapInline wasn't using a suitable temporary directory

Win32::GUI::BitmapInline was always using the current directory to create temporary files. This failed when the current directory wasn't writable (likely under limited user accounts in Win2K and above). It now uses File::Spec->tmpdir() to get a writable temporary directory. (Tracker: 1586643)

Further, the filename chosen wasn't thread-safe. This (unlikely) race-condition should also be fixed.

Toolbar Addbitmap can't be called multiple times

The Win32::GUI::Toolbar::AddBitmap() method failed when called a second time, reporting that you couldn't use it when an imagelist was already assigned (regardless of whether you had assigned an imagelist or not). It may now be called more than once to add individual bitmaps to the toolbar.

Deprecated feature status

This section documents features that have been deprecated in this release, or in recent releases, and feature that will be deprecated in up-coming releases.


The introduction of Win32::GUI::Constants in v1.04 means that we now have access to a very large number of constants, so the v1.03 behaviour of Win32::GUI to export all constants to the calling namespace by default is no longer appropriate. So, a bare

  use Win32::GUI;

now generates a warning that the old default behaviour will be deprecated - although the export behaviour of Win32::GUI v1.03 is maintained except for this warning.

To eliminate this warning and correct your script, do one of the following:

If you don't need any constants, use the empty list:
  use Win32::GUI();
If you need some constants, name them explicitly:
  use Win32::GUI qw(ES_WANTRETURN CW_USEDEFAULT); # Two constants exported
  use Win32::GUI qw(/^MB_/);   # Export all constants starting with MB_

See the Win32::GUI::Constants documentation for the full allowable syntax.

You are advised to fix your scripts now, as a future version will stop exporting any constants by default.

Although not advised, you can suppress the warnings by turning deprecated warnings off:

  no warnings 'deprecated';

Additionally accessing constants from within the Win32::GUI namespace is deprecated. I.e.

   -addstyle => Win32::GUI::WS_BORDER,

will generate a warning with this release, and will stop working with a future release. Use one of the following methods instead:

use the Win32::GUI::Constants namespace instead
  -addstyle => Win32::GUI::Constants::WS_BORDER,
use any other namespace you fancy
  use Win32::GUI qw(-exportpkg => A::B -autoload);
  -addstyle => A::B::WS_BORDER,
maintain compatibility of existing scripts
  use Win32::GUI::Constants qw(-exportpkg => Win32::GUI :compatibility_win32_gui);
  -addstyle => Win32::GUI::WS_BORDER,


It is no longer necessary to use the '-id' option to any of the Win32::GUI::NotifyIcon methods. The ID is now entirely handled internally. You will receive deprecated warnings if you use it.

In particular, removing Icons from the system tray should be done using


and not by the (now deprecated)

  $NI->Delete(-id => 1);

Use of the -id option will generate a warning.