error on using PDF Converter with asp.net

[weilich]

I got a error when I use the PDF converter in asp.net code, the error is generated from the code: PDFWeb.DriverInit(PDFPrinter)
And the message is like following:
System.InvalidCastException: QueryInterface for interface CDIntf.ICDIntf failed.

The PDF converter works ok in my .NET window application. Anyone has a clue about that? Thanks a lot.

WEI

[Joan]

If you are using our latest version 2.10 of the PDF Converter than you need to use CDintfEx and not CDintf.

[weilich]

That is not the problem. I am trying to run your sample code TN08 on our windows 2000 server. I used your old version of PDF Converter and I also tried your lastest demo version. Both have the same problem. The codes can be successfully compiled. But just get that error at running.
And I also tried to set the directive <%@Page AspCompat="true"%> in the login.aspx and use the impersonate in web.config like: <identity impersonate="true" userName="administrator" password="abcd" />, still not work.

Thanks a lot.

[pcasilao]

I also have the same problem. I installed the PDF converter demo version (TN08 - ASP.NET).

After selecting the file, I get this error when clicking on the print file button.

"QueryInterface for interface CDIntfEx.ICDIntfEx failed"

[Jose]

Hello WEI and pcasilao,

I suspect that the situation you are encounter is related to security. The ASP.NET user account is very limit by default and I suggest that you try to use another account.

Hope this helps?

[pcasilao]

Hi Jose,

You mentioned the ASPNET user account having limited access. Wouldn't changing the account's permissions work?

You also said to use a different account. How can I do that?

[Jose]

Hello pcasilao,

Yes, I suspect the account's permissions should work.

I have also researched the "System.InvalidCastException: QueryInterface for interface" message and that is almost always related to permissions.

Have you tried puttign your ASP.NET user in the Admin group?

Thanks

[pcasilao]

Ok, it works. But will this always be the case, assigning adminstrator permission to the ASPNET account to make the converter work? Any alternatives?

Also, when selecting a file from the PDFViewer, there is nothing displayed on the viewer control. I already enabled the "download ActiveX controls".