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Process method

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Called when a source file is ready to be processed.

Syntax

HRESULT retVal = object.Process(pStream);

Parameters

  • pStream
    Type: IStream

    Pointer to an IStream interface that contains the image to process.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

The IImageDecodeFilter::Process method is called when Windows Internet Explorer needs to process an image of the registered MIME type.

The pStream parameter contains a simplified IStream implementation optimized for sequential read-only access. It does not support random access, or other stream-related functionality. Access beyond end-of-file is permitted; however, the call to ISequentialStream::Read will return S_FALSE.

Draw the decoded image onto the surface that is obtained from the IImageDecodeEventSink::GetSurface method. Images that require a large amount of memory will result in a severe degradation of performance.

See also

IImageDecodeEventSink::GetSurface