ico(n)							       Windows ICO handling							    ico(n)

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NAME

       ico - Reading and writing windows icons

SYNOPSIS

       package require Tcl  8.4

       package require ico  ?1.0.5?

       ::ico::icons file ?option value...?

       ::ico::iconMembers file name ?option value...?

       ::ico::getIcon file name ?option value...?

       ::ico::getIconByName file name ?option value...?

       ::ico::getFileIcon file ?option value...?

       ::ico::writeIcon file name depth data ?option value...?

       ::ico::copyIcon file index file2 index2 ?option value...?

       ::ico::EXEtoICO file ?dir?

       ::ico::clearCache ?file?

       ::ico::transparentColor image color

       ::ico::Show file ?option value...?

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DESCRIPTION

       This  package  provides	functions for reading and writing Windows icons from ICO, EXE, DLL, ICL, and BMP files.  As used in this module an
       icon is a visual representation of an object.  An icon consists of one or more images usually with varying resolution and color depth. Each
       icon and image has a resource identifier which may be a text string or a positive integer value. Most commands use this identifier to spec-
       ify which icon or image to operate on.

API

       ::ico::icons file ?option value...?
	      Returns a list of icons found in file where each element is the name or numeric ID. Recognizes the following options:

	      -type fileFormat

       ::ico::iconMembers file name ?option value...?
	      Returns a list of images that make up the icon with ID name. Each element is itself a sublist in the format {name width height bpp}.
	      Recognizes the following options:

	      -type fileFormat

       ::ico::getIcon file name ?option value...?
	      Extracts	the  icon  with  ID  name from file.  The default -format is image which will return the name of a Tk image containing the
	      icon. The resolution and color depth are selected with the ?-res?, ?-bpp?, and ?-exact? options.	If -exact is specified	and  there
	      is  no exact match, an error is thrown.  Optionally -image may be used to specify the name of the Tk image that is created. If -for-
	      mat is colors then a list of color names in the #RRGGBB format is returned. Each list element is a horizontal row.  Each	horizontal
	      row  contains  a	list of colors for all the pixels in that row from left to right. If -format is name then the resource name of the
	      image chosen is returned.  This is useful for calling writeIcon or getIconByName.  Recognizes the following options.

	      -type fileFormat

	      -format value

	      -image value

	      -res value

	      -bpp value

	      -exact value

       ::ico::getIconByName file name ?option value...?
	      Extracts the image with ID name from file. This name should be the name of a specific image as returned by  ::ico::iconMembers,  not
	      an  icon	name  returned from ::ico::icons. If there is no matching resource ID in file an error is thrown. Recognizes the following
	      options:

	      -type fileFormat

	      -format value

       ::ico::getFileIcon file ?option value...?
	      This command is only functional when running under Windows. It reads the Windows registry to determine the display icon for file	as
	      it  would  appear  in  Explorer or similar. file does not need to exist and may also be specified as a file extension with a leading
	      dot. If file is a directory or you specify the special name Folder then the icon representing a folder  is  returned.  This  command
	      takes the same arguments and usage as getIcon:

	      -format value

	      -image value

	      -res value

	      -bpp value

	      -exact value

       ::ico::writeIcon file name depth data ?option value...?
	      Writes  an  image  to file. name is the resource identifier of the image in file to write.  When writing to an EXE, DLL, or ICL file
	      you may only overwrite existing icons with an icon of the same dimensions and color depth. No icons  may	be  added  to  these  file
	      types.

	      When  writing  to BMP the name is ignored as this type can contain only one image. This means if the file already existed it is com-
	      pletely overwritten.

	      When writing to an ICO or ICODATA file if the name specified does not exist then an image is appended and will be named the next	in
	      sequence	(the  specified  name  is  ignored). Images in ICO and ICODATA files may be overwritten with differing dimensions or color
	      depths.  Note that you will get strange results when displaying icons if you fail to change every image which makes up a given icon.

	      integer depth (in)
		     This argument must have a value of 1, 4, 8, 24, or 32. If data has more colors than the color depth allows an error  will	be
		     generated.

	      options data (in)
		     This argument is either a list of colors in the format returned by ::ico::getIcon -format colors or the name of a Tk image.

       Recognizes the following options.

	      -type fileFormat

       ::ico::copyIcon file index file2 index2 ?option value...?
	      Copies the icon at index in file to index2 in file2.

	      -fromtype fileFormat

	      -totype fileFormat

       ::ico::EXEtoICO file ?dir?
	      Extracts	all  icons  from  the executable file to ICO files placed in dir. ?dir? defaults to the directory file is located in. Icon
	      files will be named in the form file-ID.ico where ID is the icon resource identifier.

	      -type fileFormat

       ::ico::clearCache ?file?
	      The ::ico::getIconList command caches icon offsets inside EXE, DLL, ICL, and ICO files in order to speed up extraction.	This  com-
	      mand clears that cache for the specific ?file? or all files.

       ::ico::transparentColor image color
	      If  image is a single word it is assumed to be the name of a Tk image.  All pixels matching color in the image will be set transpar-
	      ent.  Alternatively, image may be a color list in which case a modified list is returned.

       ::ico::Show file ?option value...?
	      Application level command which displays a window showing all the icons in file and their name.

	      -type fileFormat

	      -parent pathName

EXAMPLE

	   button .explore -image [::ico::getIcon explorer.exe 0 -name explore -res 16 -bpp 8]

	   set i [lsearch -inline [::ico::iconMembers tclkit.exe 0] {* 32 32 8}]
	   set colorlist [::ico::getIconByName tclkit.exe [lindex $i 0] -format colors]

LIMITATIONS

       Icons may not be added or removed from file types other than ICO. Icons in these files may only be replaced with icons of the  same  dimen-
       sions and color depth.

       Icons of 8bpp or lower must include black in the pallete, this means if your icon does not have black in it, you will need to leave a color
       free so that it may be included by writeIcon.

       There is currently no way to read alpha channel information from 32bpp icons.

       Tk images do not have an alpha channel so the only way to write a true 32bpp icon is from a color list. writing a 32bpp icon from a Tkimage
       is identical to writing a 24bpp icon.

KEYWORDS

       dll, entry, exe, ico, icon

ico								       1.0.5								    ico(n)