IMDSPObject2::ReadOnClearChannel method (mswmdm.h)
The ReadOnClearChannel method reads data from the object at the current position without using secure authenticated channels. This is still secure for use with DRM-protected content. This operation is valid only if the storage object represents a file. If IMDSPObject2 is supported, this method must be implemented. Windows Media Device Manager does not fall back to IMDSPObject::Read if this method fails.
HRESULT ReadOnClearChannel( [out] BYTE *pData, [in, out] DWORD *pdwSize );
Pointer to a buffer to receive the data read from the object.
[in, out] pdwSize
Pointer to a DWORD specifying the number of bytes of data to read. Upon return, this parameter contains the actual amount of data read.
The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:
- Standard COM error codes
- Windows error codes converted to HRESULT values
- Windows Media Device Manager error codes
This method can be used for DRM-protected content. This method is more efficient than IMDSPObject::Read because this method does not involve encrypting and decrypting parameters.