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Old January 23rd, 2007, 04:57 AM
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Default C# Interop problem with ASP.Net

I am using DllImport to call the win32 API of our own C++ dll.

The API takes pointer to pointer to struct. So I am passing reference of IntPtr to that API and getting the data . I am using Marshal.ReadIntPtr to get each pointer to struct and get the data within the struct.

If I call this API from any windows application (console) I am getting the proper output and everything works fine.

But incase of ASP.Net, when I call the API from the code behind, the data comes properly but, in many cases
the aspnet_wp.exe crashes. When I debug that, I found that till the page_unload of the web page everything works fine, and after that only suddenly the worker process crashes. Thus I felt there can be some problem in deallocating the Intptr which works as Pointer to Pointer to struct.

I tried to deallocate the IntPtr (which was allocated in C++ code) using Marshal.FreeHGlobal and Marshal.DestroyStructure. None of this worked for me and I dont have any solution for the same.

Looking forward for your reply.

Thanks and regards,

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