ASP.NET: problem loading managed C++ DLL

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  • Start date Start date
G

Guest

Hello All

I have a unmanaged C++ DLL, which has been wrapped up with a manged C++ DLL.
When i refer to this managed DLL in Windows form based applications it works out fine. But when i refer to the the same managed C++ DLL in ASP.Net application. [i.e, : ASP.NET --> TALW (managed C++ DLL) --> TAL (unmanaged c++ DLL)

it gives me the following runtime error

(where TALW is the managed c++ wrapper around a umanaged C++ dll

Server Error in '/EMSUI' Application.
-------------------------------------------------------------------------------

Unable to load file 'TALW'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileLoadException: Unable to load file 'TALW'

Source Error:

Line 34: case "start"
Line 35: objServices = new Services()
Line 36: objEms.init()
Line 37: xmlData = objEms.getAllServices() ;//objServices.GetAllSevices()
Line 38: if(xmlData == "error"


Source File: c:\inetpub\wwwroot\emsui\actionclasses\actionservices.cs Line: 36

Stack Trace:

[FileLoadException: Unable to load file 'TALW'.
EMSStubSpace.EMSStub.init() +
EMSUI.ActionClasses.ActionServices.Execute(HttpContext context) in c:\inetpub\wwwroot\emsui\actionclasses\actionservices.cs:3
MVCWeb.Controller.ProcessRequest(String actionControlID, HttpContext context) in f:\dmp\modules\ui framework\development\src\controller.cs:7
EMSUI.ServicesUI.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\emsui\services.aspx.cs:4
System.Web.UI.Control.OnLoad(EventArgs e) +6
System.Web.UI.Control.LoadRecursive() +3
System.Web.UI.Page.ProcessRequestMain() +73

I tried placing all the refered DLLS in System32 and System folder. But no vain
Please help me out

You can directly mail as well at : (e-mail address removed)/ (e-mail address removed)

NG
 
Hi NGM,

We had similar problems loading our Managed C++/Unmanged C++ DLL combo. The reasons
why they failed included:

* The Unmanaged DLL were not in the system evironment variable
* There was a conflict with some global C++ classes and the .NET classes.

The error we were getting was more like:

"[FileNotFoundException]: File or assembly name SomeDLL, or one of its dependencies, was not found."

so I'm wondering if your issue is really a problem with loading the unmanaged DLL. I'm a assuming
that the unmanaged DLL is dynamically linked but statically linked through a lib.

It seems strange that it occurs during a page load and no sooner. How have you referenced
the Managed C++ library?

Simon. K
 
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