Question

Saving icon to 256 colors

Asked by: DelphiCool

hi

I have an exe wich have a 256 colors icon.
I try to save the icon as it is, but I only obtain a 16 colors icon, Why ??

here my code:


var ico :TIcon;
    hico :HICON;
 begin
 hico := ExtractIcon(Hinstance,PChar(paramstr(0)),0);    
 ico := TIcon.Create;   ico.Handle := Hico;    
 ico.SaveToFile('test.ico');
 ico.Free;
 end;

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Asked On
2003-01-10 at 22:42:12ID20452366
Tags

256

Topic

Delphi Programming

Participating Experts
3
Points
150
Comments
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Answers

 

by: AlexWerPosted on 2003-01-11 at 02:10:19ID: 7707145

Read help :-)

Note:     TIcon can be used to display the value of a multi-resolution (>16 color) icon. However, it can not support the creation of multi-resolution icons, nor the resizing of the image after it is loaded from a file or stream.

try to use WIndows Api functions to manipulate multi-resolution icons.

 

by: MadshiPosted on 2003-01-11 at 05:15:13ID: 7707489

Have you tried using SHGetFileInfo? I don't remember why, but I have in memory that it worked better somehow. Perhaps it was because of the color depth, but I'm not sure anymore.

Regards, Madshi.

 

by: DelphiCoolPosted on 2003-01-11 at 06:49:56ID: 7707719

no way

same thing with this code

var
  Info: TSHFileInfo;
  Flags: Cardinal;
begin
    Flags := SHGFI_ICON or SHGFI_LARGEICON or SHGFI_USEFILEATTRIBUTES;

  SHGetFileInfo(PChar(edit2.Text), FILE_ATTRIBUTE_NORMAL, Info, SizeOf(TSHFileInfo), Flags);
   image2.Picture.Icon.Handle := Info.hIcon;
   image2.Picture.Icon.SaveToFile('test.ico');
end;

 

by: MadshiPosted on 2003-01-11 at 06:58:44ID: 7707738

Okay, I'm not sure exactly why that doesn't work. Anyway, what I'm personally using (and which works well for me) is calling SHGetFileInfo, but with different parameters. Don't use the "Info.hIcon" member, instead get the handle of the system image list and use the "Info.iIcon" member. This way I'm getting the very same icons that are shown in My Computer. Here's some code for that:

http://www.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_10137835.html

Regards, Madshi.

 

by: DelphiCoolPosted on 2003-01-11 at 08:44:53ID: 7708109

sorry  I tryed but I can get a file with 256 colors
:-(

 

by: MadshiPosted on 2003-01-11 at 09:06:08ID: 7708198

I don't understand what you mean with that.

 

by: Slick812Posted on 2003-01-11 at 09:22:01ID: 7708248

hello DelphiCool, I worked on this saving icon file and icon color depth problem, it ain't so easy, if it was easy, the Delphi TIcon would save an Icon to 256 colors or 24 bit color or 32 bit (XP Icon with alpha chanel shadow info). I could not find a good way to determine the original color depth of an hIcon. Here is a EE question that does a 256 color Icon file save with multiple Icons, but it uses the "Standard" pallete for the Icon -

http://www.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_20341923.html

be warned that the PickIconDlg will need PWChar instead of PChar in the NT systems (win2000, win XP), ,  

A Icon file save with 24 bit color may suit you better, I have some code for that. Ask questions if you need more information

 

by: DelphiCoolPosted on 2003-01-11 at 12:09:42ID: 7708948

this exemple seems to extract icon from a file to an image list.

but when I try to extract  an icon from the imagelist
it's in 16 colors


could I manipulate the Hpalette, and how?

 

by: Slick812Posted on 2003-01-14 at 21:53:36ID: 7730221

I don't understand? ?

 

by: DelphiCoolPosted on 2003-01-14 at 23:35:58ID: 7730609

ok, I accept your answer Slick812.
I found the Tjvicon component too.

Bye

20120131-EE-VQP-002

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