error COM cast

[Tom Princen]

I got this error on a server. (On my PC everything works fine
Unable to cast COM object of type 'System.__ComObject' to interface type 'PDFXCoreAPI.IPXS_Inst'
This operation failed because the QueryInterface call on the COM component for the interface with IID '{9B44A054-D66C-4AC6-90DB-2E23FBB67EF5}' failed due to the following error: Bad variable type. (Exception from HRESULT: 0x80020008 (DISP_E_BADVARTYPE)).

[Sasha - Tracker Dev Team]

Hello Tom,

Please provide a code sample so that we can analyze it and advice to your problem.

Cheers,
Alex

[Tom Princen]

This is the code that generates the error:

if (Initialized == false)
{
MyPXC.Init(lsKey);
//MyPXV.Init(
// MyIPXV = (IPXV_Inst)MyPXC.GetExtension("PXC");
MyIPXS = (IPXS_Inst)MyPXC.GetExtension("PXS");
MyIAUX = (IAUX_Inst)MyPXC.GetExtension("AUX");
Initialized = true;
}

[Sasha - Tracker Dev Team]

Please read this topic - there was a problem with Windows Server with Editor SDK - maybe it would lead you to solution:
https://forum.pdf-xchange.com/ ... 66&t=26088

Cheers,
Alex

[Tom Princen]

I think I found the problem:
It is not threadsave!

You can only use the PXC.Init function from 1 thread?!
What's the best way to solve this?

[Sasha - Tracker Dev Team]

The best thing to do would be provide a small working project sample that we can try and we'll advice you further.

Cheers,
Alex

[Lzcat - Tracker Supp]

Hi Tom.

I think I found the problem:
It is not threadsave!

You will be surprised, but PXC.Init must be called once when loading DLL (or starting application if it does not call LoadLibrary directly). It is common PDF engine initialization and should be done once until program is closed.