PngImageList Fix for DEP and Update for D2009


probably you already encountered the problem that your Delphi IDE crashes instantly when using the TPngImageList Thany made available years ago. This happens if you use the TPngImageList Designtime Package under systems with activated Data Execution Prevention (DEP).

Despite the fact that this problem existed for some years now Christian of the JEDI Windows API Team was the first to write about it in his blog recently.

Mitja P. added a comment which provides the source and a solution for the bug:

There is a function PatchPtr used in PngComponents unit PngImageList that needs a change of VirtualProtect to PAGE_EXECUTE_READWRITE instead of only PAGE_READWRITE if I remember correctly. I am also not sure if I reported this to the author at the time I was playing around with this components or not.

I’ve verified that this fix solves the issue for Delphi 2006 up to Delphi 2009. Thank you Mitja!

Additionally there is an updated version of the TPngImageList (created by Uwe Raabe) available at the CodeGear Repository:

PngComponents for Delphi 2009

As Delphi 2009 only integrates the PNG support into native ImageLists this updated component allows for using your already existing PngImageLists from projects prior to Delphi 2009 without any change to the images!

Please be aware that this version needs the mentioned fix as well, so update the source before installing the package.


Fix: Indy Mail Attachment Filenames lost in D2009


probably you already discovered a bug in Indy & D2009 that when sending E-Mails with attachments you will loose the attachment filenames.

This is related to a small bug in the Indy Version shipped with the initial release of Delphi 2009. It has already been fixed in the Indy SVN.

See the QualityCentral report for it:

Bug Report Background:
Without the line break fix (see below) the attachment filename is printed in the same line as “Content-Disposition” and so some mail clients ignore the filename. Without it the file will have random names regarding to the used client.

If you do not want to update the whole Indy version shipped with D2009 you can fix the bug on your own:

1) Copy the VCL source file for IdMessageClient.pas from your D2009 directory:
C:Program FilesCodeGearRAD Studio6.0sourceIndyIndy10ProtocolsIdMessageClient.pas
to your project’s directory
2) Edit the IdMesageClient.pas and change the lines given below:

procedure TIdMessageClient.SendBody(AMsg: TIdMessage):
  if LFileName  '' then begin
    IOHandler.WriteLn(';'); // inserted for QC 66867, between original line 1214/1215
    IOHandler.Write('        name="' + LFileName + '"'); {do not localize}
  IOHandler.WriteLn('Content-Transfer-Encoding: ' + LAttachment.ContentTransfer); {do not localize}
  // next line fixed for QC 66867, changed IOHandler.Write<strong>Ln</strong> to IOHandler.Write
  IOHandler.Write('Content-Disposition: ' + LAttachment.ContentDisposition); {do not localize}
  if LFileName  '' then begin
    IOHandler.WriteLn(';'); // inserted QC 66867, line 1220/1221
    IOHandler.Write('        filename="' + LFileName + '"'); {do not localize}

3) Save and do a full-rebuild on your project
4) Verify that IdMessageClient.dcu has been created in your project’s directory

You can also replace the existing files in the Delphi 2009 source
directory at:

C:\Program Files\CodeGear\RAD Studio\6.0\source\Indy\Indy10\Protocols\IdMessageClient.pas

If you are doing the latter, be sure to replace the DCUs at:

1) C:\Program Files\CodeGear\RAD Studio\6.0\lib\Indy10\IdMessageClient.dcu
2) C:\Program Files\CodeGear\RAD Studio\6.0\lib\debug\Indy10\IdMessageClient.dcu

You may create the needed DCUs with the earlier mentioned steps, one
time without and a second time with enabled “Build Debug DCU” option.