.NET Release 172 Examples are not working

[GoogleCodeExporter]

Hi,

I cannot run your examples.

I get 'The type initializer for 'SWIGExceptionHelper' threw an exception.'. One 
of the inner exceptions contains following message:

c:\\Users\\Laurent\\Documents\\or-tools\\bin\\Google.OrTools.Graph.dll': The 
specified module could not be found.

Original issue reported on code.google.com by msti...@gmail.com on 2 Aug 2012 at 10:29

[GoogleCodeExporter]

I'm getting a similar issue when running my C# application against the 
pre-built v1972 .NET Win32 Google.OrTools.ConstraintSolver.dll binary. An inner 
exception contains:

Unable to load DLL 
'c:\Users\Laurent\Documents\or-tools\bin\Google.OrTools.ConstraintSolver.dll': 
The specified module could not be found. (Exception from HRESULT: 0x8007007E)

For now I'll need to revert to a previous release.

Original comment by t...@zanyants.com on 3 Aug 2012 at 11:28

[GoogleCodeExporter]

I tried previous release 1930 too, but same error occurs.

Original comment by msti...@gmail.com on 3 Aug 2012 at 11:32

[GoogleCodeExporter]

Full stack trace is:

System.TypeInitializationException: The type initializer for 
'Google.OrTools.Graph.operations_researchPINVOKE' threw an exception. 
---> System.TypeInitializationException: The type initializer for 
'SWIGExceptionHelper' threw an exception. 
---> System.DllNotFoundException: 
Unable to load DLL 
'c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll': The 
specified module could not be found. (Exception from HRESULT: 0x8007007E)
   at Google.OrTools.Graph.operations_researchPINVOKE.SWIGExceptionHelper.SWIGRegisterExceptionCallbacks_operations_research(ExceptionDelegate applicationDelegate, ExceptionDelegate arithmeticDelegate, ExceptionDelegate divideByZeroDelegate, ExceptionDelegate indexOutOfRangeDelegate, ExceptionDelegate invalidCastDelegate, ExceptionDelegate invalidOperationDelegate, ExceptionDelegate ioDelegate, ExceptionDelegate nullReferenceDelegate, ExceptionDelegate outOfMemoryDelegate, ExceptionDelegate overflowDelegate, ExceptionDelegate systemExceptionDelegate)
   at Google.OrTools.Graph.operations_researchPINVOKE.SWIGExceptionHelper..cctor()
   --- End of inner exception stack trace ---
   at Google.OrTools.Graph.operations_researchPINVOKE.SWIGExceptionHelper..ctor()
   at Google.OrTools.Graph.operations_researchPINVOKE..cctor()
   --- End of inner exception stack trace ---
   at Google.OrTools.Graph.operations_researchPINVOKE.new_StarGraph__SWIG_1(Int32 jarg1, Int32 jarg2)
   at Google.OrTools.Graph.StarGraph..ctor(Int32 max_num_nodes, Int32 max_num_arcs)
   at CsFlow.SolveMinCostFlow() in C:\Users\m\Desktop\or-tools.x64\examples\csharp\csflow.cs:line 31

Original comment by msti...@gmail.com on 9 Aug 2012 at 6:37

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

After inspecting the dll in .NET Reflector I found that hardcoded absolute 
paths are used in [DllImport] interface generated by SWIG.
Check the code below...

internal class operations_researchPINVOKE
{
    // Fields
    protected static SWIGExceptionHelper swigExceptionHelper;
    protected static SWIGStringHelper swigStringHelper;

    // Methods
    static operations_researchPINVOKE();
    public operations_researchPINVOKE();
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_EbertLinearSumAssignment")]
    public static extern void delete_EbertLinearSumAssignment(HandleRef jarg1);
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_ForwardEbertLinearSumAssignment")]
    public static extern void delete_ForwardEbertLinearSumAssignment(HandleRef jarg1);
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_ForwardStarGraph")]
    public static extern void delete_ForwardStarGraph(HandleRef jarg1);
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_ForwardStarStaticGraph")]
    public static extern void delete_ForwardStarStaticGraph(HandleRef jarg1);
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_LongResultCallback1")]
    public static extern void delete_LongResultCallback1(HandleRef jarg1);
    [DllImport(@"c:\Users\Laurent\Documents\x64-or-tools\bin\Google.OrTools.Graph.dll", EntryPoint="CSharp_delete_LongResultCallback2")]
    public static extern void delete_LongResultCallback2(HandleRef jarg1);

    ...

Original comment by msti...@gmail.com on 9 Aug 2012 at 6:46

[GoogleCodeExporter]

I have finally solved this.

In Makefile.csharp.mk set

IMPORTPREFIX=

That will fix [DllImport] declarations and after build, resulting dll will work 
normally...

Original comment by msti...@gmail.com on 9 Aug 2012 at 12:49

[GoogleCodeExporter]

Hello, 

I have fixed this too.
I guess you will need to add the or-tools/bin in your path for swig to find the 
dll.

Thanks

Original comment by lper...@google.com on 9 Aug 2012 at 7:39

• Changed state: Fixed

[GoogleCodeExporter]

It works better with 
IMPORTPREFIX= 
as you don't need to have or-tools/bin in path.

IMPORTPREFIX is used only for swig dllimport switch, which is not used to point 
to the library itself, but to generate [DllImport] declarations in generated cs 
files.

See src\gen\com\google\ortools\graph\operations_researchPINVOKE.cs

-dllimport "$(IMPORTPREFIX)Google.OrTools.LinearSolver.$(SHAREDLIBEXT)"

Latest .NET releases throw following exception:
"Unable to load DLL '\\bin\\Google.OrTools.Graph.dll': The specified module 
could not be found.  

Original comment by msti...@gmail.com on 10 Aug 2012 at 6:39

[GoogleCodeExporter]

indeed.
I am uploading new archives.

They run ok on my computer.

Thanks

Original comment by laurent....@gmail.com on 10 Aug 2012 at 9:18