ASP.NET and mapscript - unable to load DLL

[Mike Boos]

Thank you for that advice! I ran filemon and discovered that it was 
trying (unsuccessfully) to find libcurl.dll - which somehow didn't show 
up in my dependency tracking tool. It's now in my system path.

I'm now running into new trouble. When I try to create a mapObj with 
"mapObj m_obj = new mapObj(mapfile);" I get the following error:


    /Object reference not set to an instance of an object./

* 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.NullReferenceException: Object reference 
not set to an instance of an object.

Any suggestions?
Mike

Tamas Szekeres wrote:

>Have you tried SysInternals's filemon or a similar program to monitor the
>expected location of theese files?
>
>
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>On Fri, 19 Aug 2005 13:23:38 -0400, Mike Boos <mboos at AUGSIGNALS.COM> wrote:
>
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>>mapscript_csharp.dll is present in the bin directory. All the others are
>>in system32. gdal12.dll is in both as I'm somehow invoking a function
>>    
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>>from it from elsewhere and not having the slightest bit of trouble with
>  
>
>>that part (I'm using a direct DllImport attribute). So maybe I will have
>>to try one of the alternatives. Oh well.
>>
>>Mike
>>
>>Abe Gillespie wrote:
>>
>>    
>>
>>>Did you move mapscript.dll to system32 as well?  The only DLL that
>>>should be in your bin dir is mapscript_csharp.dll.
>>>
>>>Suggestions:
>>>1.  Write the mapfile by hand with the file streaming objects?
>>>2.  Wrap the MapServer CGI executable with ASP.NET (I think someone
>>>did just this some time ago).
>>>3.  If this is all you're doing, you *might* be able to get away with
>>>it in ASP.NET.  See if there's a way to protect a section of ASP.NET
>>>code with a semaphore or similar construct.  Is there something that
>>>protects in the virtual thread environment?
>>>
>>>-Abe
>>>
>>>On 8/19/05, Mike Boos <mboos at augsignals.com> wrote:
>>>
>>>
>>>      
>>>
>>>>I tried moving the dlls to the system32 directory, but that doesn't have
>>>>any effect (am I missing any other dependencies?)
>>>>
>>>>Unfortunately, I'm kind of stuck with ASP.NET, as that's what the rest
>>>>of the site relies upon. I'm trying to improve the present setup which
>>>>involves sending a request to a C++ CGI program which writes a map file
>>>>to the hard disk and forwards the request to mapserv.exe. If you'd ask
>>>>me, that's a bit of a kluge, and without Mapscript, all I could do to
>>>>improve on that would be to take out the C++ program and have the map
>>>>file generated from within the ASP.NET program itself. Can you think of
>>>>a better way to accomplish the same task?
>>>>
>>>>Mike
>>>>Abe Gillespie wrote:
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>>>Placing the depended-on DLLs into the bin dir will do nothing.  I
>>>>>assume you're on a windows box.  Therefore the easiest way to take
>>>>>care of this is by placing all the DLLs (except for map_script) into
>>>>><windows>\system32 where <windows> is the system windows directory
>>>>>(c:\winnt, c:\windows, etc.).
>>>>>
>>>>>With that said, you're entering a world of pain by using C# map_script
>>>>>in ASP.NET.  Much of the map_script DLL is thread unsafe, that
>>>>>combined with ASP.NET's supremely weird threading model (e.g. virtual
>>>>>threads), you're going to encounter a plethora of problems.  This is
>>>>>why you almost never see MapServer + ASP.NET discussion threads.
>>>>>
>>>>>To get more info, search the archives.  You should find ten or so
>>>>>messages about this topic.
>>>>>
>>>>>-Abe
>>>>>
>>>>>On 8/18/05, Mike Boos <mboos at augsignals.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>>>Hello
>>>>>>
>>>>>>I'm trying to run Mapscript using the SWIG C# bindings on an ASP.NET
>>>>>>server. I compiled the 4.6.0 version of MapServer and have placed
>>>>>>            
>>>>>>
>what I
>  
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>>>>>>believe to be the appropriate dependencies (mapscript_csharp.dll,
>>>>>>mapscript.dll, libmap.dll, bgd.dll, gdal12.dll, pdflib.dll) in the bin
>>>>>>directory on my server. It is appears to be finding
>>>>>>mapscript_csharp.dll, but is having trouble finding mapscript.dll or
>>>>>>            
>>>>>>
>one
>  
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>>>>>>of its dependencies. I am seeing the following error message:
>>>>>>
>>>>>>
>>>>>>Server Error in '/' Application.
>>>>>>
>>>>>>
>>>>>>  /Unable to load DLL (mapscript)./
>>>>>>
>>>>>>* Description: *An unhandled exception occurred during the execution
>>>>>>            
>>>>>>
>of
>  
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>>>>>>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.DllNotFoundException: Unable to load DLL
>>>>>>(mapscript).
>>>>>>
>>>>>>Am I missing a dependency? Or do I need to set some configuration
>>>>>>            
>>>>>>
>option
>  
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>>>>>>or place the files elsewhere?
>>>>>>
>>>>>>Thanks!
>>>>>>Mike Boos
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>            
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>        
>>>>
>>>
>>>
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>>>      
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