Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
If the stream is non-blocking, nsIInputStreamLength::length() can return NS_BASE_STREAM_WOULD_BLOCK. The caller must then wait for the stream to know its length.
If the stream implements nsIAsyncInputStreamLength, then the caller can use this interface to request an asynchronous notification when the stream's length becomes known (via the AsyncLengthWait method). If the length is already known, the aCallback will be still called asynchronously.
If the stream has already been read (read()/readSegments()/close()/seek() methods has been called), length() returns NS_ERROR_NOT_AVAILABLE.
This object is notified when the length becomes known. This parameter may be null to clear an existing callback.
Specify that the notification must be delivered to a specific event target.
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Increases the reference count for this interface. The associated instance will not be deleted unless the reference count is returned to zero.
Returns
The resulting reference count.