IPortableDevice::Cancel method
The Cancel method cancels a pending operation on this interface.
Syntax
HRESULT Cancel();
Parameters
This method has no parameters.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The operation was canceled successfully. |
Remarks
If your application invokes the WPD API from multiple threads, each thread should create a new instance of the IPortableDevice interface. Doing this ensures that any cancel operation affects only the I/O for the affected thread.
If an IStream write operation is underway when the Cancel method is invoked, your application should discard all changes by invoking the IStream::Revert method. Once the changes are discarded, the application should also close the stream by invoking the IUnknown::Release method.
Also, note that if the Cancel method is invoked before an IStream::Write method has completed, the data being written may be corrupted.
Requirements
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Header |
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Library |
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See also