AudioVideoPlayb ack - Attempted to access an unloaded AppDomain.

[Charles Herring]

In my asp.net application I upload a video file and then need to get the
duration and other properties.
I get "Attempted to access an unloaded AppDomain" when I instanciate the
Video object.
I am impersonating Administrator.
Here is the code:

Dim v As Video = New Video(fname, True)

intHeight = v.DefaultSize.H eight

intWidth = v.DefaultSize.W idth

Duration = v.Duration

v.Dispose()

Here are the errors:

? ex.Source
Run-time exception thrown : System.NullRefe renceException - Object reference
not set to an instance of an object.
? ex.InnerExcepti on
Nothing
? ex.StackTrace
" at CreateWindowExW (UInt32 , UInt16* , UInt16* , UInt32 , Int32 , Int32 ,
Int32 , Int32 , HWND__* , HMENU__* , HINSTANCE__* , Void* )
at Microsoft.Direc tX.AudioVideoPl ayback.Video.Cr eateCoverWindow ()
at Microsoft.Direc tX.AudioVideoPl ayback.Video..c tor(String fileName,
Boolean autoRun)
at MediaLibrary.Up load.getMediaFi leProperties(St ring fname, String&
strDuration, Double& Duration, Int32& intWidth, Int32& intHeight, String
ftype) in C:\Inetpub\wwwr oot\MediaLibrar y\Upload.aspx.v b:line 208"
? fname
"C:\Inetpub\www root\MediaLibra ry\Library\Slee pycabbie.wmv"
? ex.Message
"Attempted to access an unloaded AppDomain."
? ex.TargetSite.R eflectedType
Nothing
? ex.TargetSite
{System.Reflect ion.RuntimeMeth odInfo}
[System.Reflecti on.RuntimeMetho dInfo]:
{System.Reflect ion.RuntimeMeth odInfo}
Attributes: 24598
CallingConventi on: Standard
DeclaringType: Nothing
IsAbstract: False
IsAssembly: False
IsConstructor: False
IsFamily: False
IsFamilyAndAsse mbly: False
IsFamilyOrAssem bly: False
IsFinal: False
IsHideBySig: False
IsPrivate: False
IsPublic: True
IsSpecialName: False
IsStatic: True
IsVirtual: False
MemberType: Method
MethodHandle: {System.Runtime MethodHandle}
Name: "CreateWindowEx W"
ReflectedType: Nothing

[bruce barker]

your error is the video code trying to open a window, which is not allowed
from a service like asp.net. you will need to use a different library
routine that does not use direct-x.
-- bruce 9sqlwork.com)

"Charles Herring" <ch******@bigpo nd.net.au> wrote in message
news:uu******** *****@TK2MSFTNG P12.phx.gbl...

In my asp.net application I upload a video file and then need to get the
duration and other properties.
I get "Attempted to access an unloaded AppDomain" when I instanciate the
Video object.
I am impersonating Administrator.
Here is the code:

Dim v As Video = New Video(fname, True)

intHeight = v.DefaultSize.H eight

intWidth = v.DefaultSize.W idth

Duration = v.Duration

v.Dispose()

Here are the errors:

? ex.Source
Run-time exception thrown : System.NullRefe renceException - Object reference not set to an instance of an object.
? ex.InnerExcepti on
Nothing
? ex.StackTrace
" at CreateWindowExW (UInt32 , UInt16* , UInt16* , UInt32 , Int32 , Int32 , Int32 , Int32 , HWND__* , HMENU__* , HINSTANCE__* , Void* )
at Microsoft.Direc tX.AudioVideoPl ayback.Video.Cr eateCoverWindow ()
at Microsoft.Direc tX.AudioVideoPl ayback.Video..c tor(String fileName,
Boolean autoRun)
at MediaLibrary.Up load.getMediaFi leProperties(St ring fname, String&
strDuration, Double& Duration, Int32& intWidth, Int32& intHeight, String
ftype) in C:\Inetpub\wwwr oot\MediaLibrar y\Upload.aspx.v b:line 208"
? fname
"C:\Inetpub\www root\MediaLibra ry\Library\Slee pycabbie.wmv"
? ex.Message
"Attempted to access an unloaded AppDomain."
? ex.TargetSite.R eflectedType
Nothing
? ex.TargetSite
{System.Reflect ion.RuntimeMeth odInfo}
[System.Reflecti on.RuntimeMetho dInfo]:
{System.Reflect ion.RuntimeMeth odInfo}
Attributes: 24598
CallingConventi on: Standard
DeclaringType: Nothing
IsAbstract: False
IsAssembly: False
IsConstructor: False
IsFamily: False
IsFamilyAndAsse mbly: False
IsFamilyOrAssem bly: False
IsFinal: False
IsHideBySig: False
IsPrivate: False
IsPublic: True
IsSpecialName: False
IsStatic: True
IsVirtual: False
MemberType: Method
MethodHandle: {System.Runtime MethodHandle}
Name: "CreateWindowEx W"
ReflectedType: Nothing