IAMOpenProgress interface

The IAMOpenProgress interface reports the progress of a file-open operation and enables the application to cancel the operation.

Filters that open files over a network can expose this interface. An application can use it to query the progress of the download, or to cancel the download. If the network is not responsive, a method such as IGraphBuilder::RenderFile might block for an indefinite period. To prevent your application from blocking, create a worker thread that uses IAMOpenProgress to monitor the progress. The worker thread can cancel the operation if a predefined timeout occurs, or in response to a command from the user.

The File Source (URL) filter supports this interface.

Members

The IAMOpenProgress interface inherits from the IUnknown interface. IAMOpenProgress also has these types of members:

Methods

The IAMOpenProgress interface has these methods.

MethodDescription
AbortOperation

Cancels the file-open operation.

QueryProgress

Retrieves the progress of the file-open operation.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Strmif.h (include Dshow.h)

Library

Strmiids.lib

 

 

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