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IImageDecodeFilter Interface

Exposes methods used to implement a custom image source handler in Windows Internet Explorer. This handler is invoked when rendering images for the IMG element's SRC attribute.

IImageDecodeFilter Members

Initialize Called when the filter is activated by Internet Explorer.
Process Called when a source file is ready to be processed.
Terminate Called when the filter is deactivated.


Note    Internet Explorer handles Graphics Interchange Format (GIF) and JPEG images (MIME types image/gif, image/jpeg, and image/pjpeg) differently from other image formats; it renders them internally and does not send them through the IImageDecodeFilter interface. Refer to MIME Type Detection in Internet Explorer.

To register the custom image handler:

  1. Create entries for the file extension and content type.
              (Default) = myImageType
              Content Type = my_image_type
  2. Create an extension mapping for the name provided in step one. The CLSID value is the same as that of the "HTML Document" type and is used to view the image in the browser.
                   (Default) = {25336920-03F9-11CF-8FD0-00AA00686F13}
  3. Create an entry in the MIME mapping database for the content type declared in step one. The "Image Filter CLSID" value below is the GUID of the custom IImageDecodeFilter plug-in.
                   Content Type
                             Extension = .myext
                             Image Filter CLSID = {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}
  4. Finally, enter a binary array of lead bits that can used by Internet Explorer to unambiguously identify an image file and map it to the appropriate handler.
                   Content Type
                                  0 = (REG_BINARY data)

Interface Information

Stock Implementation None
Custom Implementation Yes
Inherits from IUnknown
Header and IDL files ocmm.h, ocmm.idl
Minimum availability Internet Explorer 5.5
Minimum operating systems Windows 95, Windows NT 4.0

See Also

Handling MIME Types in Internet Explorer

Community Additions

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