32-Bit Icon to Bitmap?

[Menge]

hi guys!

 

i'm posting here because i really couldn't find anywhere else on the net a way to create a bitmap from a 32bit icon.

 

no matter what i do i ALWAYS get a icon with a black border (if it uses alpha)

 

here's what i'm doing.

 

DockTypes.SHFileInfo FileInfo=new DockTypes.SHFileInfo();
SHGetFileInfo(ItemPath, 0, ref FileInfo, (uint)System.Runtime.InteropServices.Marshal.SizeOf(FileInfo), 0x200 | 0x100 | 0x0);
Icon ItemIcon=Icon.FromHandle(FileInfo.hIcon);
Bitmap IconBitmap=ItemIcon.ToBitmap();

 

and no matter what i do, it just saturates the alpha channel as if it were 1-bit. All i need is just a bitmap of the icon. nothing more.

 

can anyone please help?

[divil]

I'm afraid you'll have to keep it in Icon format and draw it using DrawIcon(). There's a bug in .NET where the alpha channel on 32bit icons is not preserved, as you have discovered. If you are adding this in to an image list, add the icon straight in to it (no intermediate bitmap), make sure the image list has the correct colour depth and make sure your application has a manifest to use common controls 6.

[Menge]

i really need this on Bitmap format b/c i need to create a Direct3DTexture out of this... dang... i even tried this

 

ItemIcon=Icon.FromHandle(FileInfo.hIcon);
Bitmap IconPic=new Bitmap(128,128);
Graphics g=Graphics.FromImage((Bitmap)IconPic);
g.DrawIcon(ItemIcon, new Rectangle(new Point(0,0),new Size(128,128)));
g.Dispose();

 

and EVEN SO it gets black borders around it... dang... any help?

[NicoVB]

I got the same problem....

 

Use like divil says, the DrawIcon method to Draw an item...

 

 

I have designed the IconBox control... see NicoLibrary on this forum...

 

 

Nico

[Menge]

it's because i need this explicitly on a Bitmap object. because DirectX requires a bitmap to create a texture from :\

[AndreRyan]

Why do you need to put an icon in Direct3D? You could create the texture from the Bitmap and use a transparency key to remove the background if it's all the same color

[Menge]

it's for a program which i'm making.

 

its a laucher program. but i'm adding more features to it.

the thing is. i have an Item type which is an alias to a folder on the hard drive... so clicking this item makes my program open the folder and display its contents. and for its UI, i'm using Direct3D. i find it very cool :)

 

u can get an internal preview here

 

AndreRyan, transparency keys doesn't work on XP-styled icons... that's where i'm having problems... on icons with an 8-bit alpha channel. usual 1-bit alpha channelled icons display just great :)

[AndreRyan]

This may be useless because it'll probably have the same effect but you can make Bitmaps directly from hIcons

DockTypes.SHFileInfo FileInfo=new DockTypes.SHFileInfo();
SHGetFileInfo(ItemPath, 0, ref FileInfo, (uint)System.Runtime.InteropServices.Marshal.SizeOf(FileInfo), 0x200 | 0x100 | 0x0);
Bitmap IconBitmap=Bitmap.FromHicon(FileInfo.hIcon);

[Menge]

AndreRyan,

 

thx :P

but it doenst do too well either :\ hehe

 

really angry about this, i am. :)