IWMRegisteredDevice::IsOpened method (wmsdkidl.h)
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The IsOpened method retrieves the open status of the device. An open device is ready to receive media data.
Syntax
HRESULT IsOpened(
[out] BOOL *pfOpened
);
Parameters
[out] pfOpened
Address of a variable that receives the open status of the device. TRUE indicates that the device is open.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
Remarks
To receive data, a device must be opened, validated, and approved.
You can use this method to find out whether the device is open. To open the device call Open.
The device is valid only if proximity detection has been performed on it within the past 48 hours. You can check the validity of the device by calling IsValid. For more information, see the IWMProximityDetection interface.
Call the IsApproved method to determine whether the device is approved. To approve the device, call the Approve method.
Requirements
| Minimum supported client | Windows XP [desktop apps only],Windows Media Format 9.5 SDK |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | wmsdkidl.h (include Wmsdk.h) |
| Library | WMStubDRM.lib |