Unable to cast COM object of type 'CADViewLib.DXFImageClass'

gnani · Post by **gnani** » 12 Apr 2011, 15:23

hello,

i am using CADViewx with c#.net.when i am trying find the extents using the AXCadvieX.DXFImage.Extents method i am getting the following error.

"Unable to cast COM object of type 'CADViewLib.DXFImageClass' to interface type 'CADViewLib.IDXFImage'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{E5FD69A2-2C2E-4E65-91D3-AF93ACAC3028}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE))."

the code is :

CADViewLib.tagFRectLong vExt = AXCadViewX.DXFImage.Extents;

Post by **support** » 13 Apr 2011, 14:22

Hello.
Setting the drawing extents to tagFRectLong instance not result in any errors in CADViewX 5 C# demo. How many treads access CADViewX component?

Alexander.

gnani · Post by **gnani** » 15 Apr 2011, 11:53

hello sir, i am getting the same error.for u r reference i am sending shot also.please go through this.

Post by **support** » 15 Apr 2011, 15:17

Hello.
We haven't encountered such error in C# demo application. Please note DXFImage supports Apartment treading model that restricts only one client thread can call the object at a time. The ApartmentState of the thread that calls the COM object must match the apartment state used by the COM object.

Alexander.

CADSoftTools