IWMSContext.GetIUnknownValue (Visual Basic .NET)
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IWMSContext.GetIUnknownValue (Visual Basic .NET)
The GetIUnknownValue method retrieves an IUnknown value from the context.
Syntax
Parameters
pstrName
String specifying the name portion of the name-value pair in the context.
lNameHint
Int32 containing an optional key that can be used to more efficiently access a value.
pValue
Reference to an Object containing the value.
lOptions
Reserved for future use.
Return Values
This method does not return a value.
If this method fails, it throws an exception.
| Number | Description |
| 0x8002000B | The property specified by the pstrName parameter could not be found. |
| 0x80020005 | The data type of the property specified by the pstrName parameter is not VT_UNKNOWN. |
| 0x80004003 | pValue is null. |
Example Code
Dim Context As IWMSContext
Dim pUnknown As IntPtr
Dim AuthContext As IWMSAuthenticationContext
Try
m_ClassFactory.AllocIWMSContext(GetType(IWMSContext).GUID, _
WMS_CONTEXT_TYPE.WMS_USER_CONTEXT_TYPE, _
pUserContext, pUnknown)
Context = Marshal.GetTypedObjectForIUnknown(pUnknown, _
GetType(IWMSContext))
Context.SetStringValue(WMSDefines.WMS_CONTENT_DESCRIPTION_TITLE, _
WMSDefines.WMS_CONTENT_DESCRIPTION_TITLE_ID, _
"My Title", 0)
Context.SetLongValue(WMSDefines.WMS_CONTENT_DESCRIPTION_NO_SKIP, _
WMSDefines.WMS_CONTENT_DESCRIPTION_NO_SKIP_ID, 1, 0)
Context.GetIUnknownValue(WMSDefines.WMS_USER_AUTHENTICATOR, _
WMSDefines.WMS_USER_AUTHENTICATOR_ID, AuthContext, 0)
Catch e As Exception
' TODO: Handle exceptions.
End Try
Requirements
Reference: Add a reference to Microsoft.WindowsMediaServices.
Namespace: Microsoft.WindowsMediaServices.Interop.
Assembly: Microsoft.WindowsMediaServices.dll.
Library: WMSServerTypeLib.dll.
Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; Windows Server 2008.
See Also
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