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Working with models, data and dynamic libraries in Mosel

Description
ExSet.vb: Using sets in Mosel (requires burglari.mos)
  • retrieve a set by its model name
  • get the set size
  • get first and last set element
  • get the name or index of a set element
ExAs.vb: Using arrays with index sets (requires trans.mos)
  • get indexing sets of an array
  • get array type
  • enumerate array entries in usual and transposed order
  • enumerate true array entries
ExProb.vb: Accessing problems and solution information with Mosel (requires blend2.mos)
  • export problem to a file (MPS or LP format)
  • get problem status
  • get objective function value
  • get primal/dual solution values, and constraint activity
ExLib.vb: Working with models and accessing dynamic libraries in Mosel
  • load and unload BIM models
  • run a model in Mosel
  • display information about loaded models
  • display information about additional libraries required by the loaded models
DispMod.vb: Display the contents of a model; the information is read from a bim file
  • display run-time parameters, requirements, symbols, package/module dependencies, annotations
DispDso.vb: Display the contents of a module
  • display constants, types, control paramters, subroutines, I/O drivers
ExDrvs*.cb.: Use I/O drivers to handle Mosel output with a callback function, compile a model from memory to memory, load a bim file from memory, initialise arrays in the Model program from .NET objects and retrieve information from the model through memory.
  • ExDrvsCallback.vb: using 'dotnet:' I/O driver for data exchange via callbacks
  • ExDrvsRaw.vb: using 'dotnetraw:' I/O driver for data exchange in memory
  • ExDrvsStream.vb: using 'dotnetstream:' I/O driver working with streams for data exchange in memory
These .vb files can be run from the VB.NET project Mosel-VB.NET.vbproj (required auxiliary files: frmMain.vb, frmMain.resx, OptimizerLog.vb).

mmexdatavb.zip[download all files]

Source Files

Data Files





ExLib.vb

Imports System.IO
Imports Mosel

' Example of working with models and accessing Mosel dynamic libraries

Module ExLib
    Public Sub RunExLib(ByVal Log As TextWriter)
        Dim mosel As XPRM
        Dim models(2) As XPRMModel

        ' Initialise Mosel
        mosel = XPRM.Init
        ' Set Mosel work directory to folder containing our example source code
        mosel.WorkDir = Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly.Location).FullName
        ' Compile and Load the BIM files
        models(0) = mosel.CompileAndLoad("Models/burglari.mos")
        models(1) = mosel.CompileAndLoad("Models/chess2.mos")
        models(2) = mosel.CompileAndLoad("Models/trans.mos")
        Log.WriteLine("Models loaded")

        ' Display basic information about the models
        Dim model As XPRMModel
        For Each model In models
            Log.WriteLine("  {0}: {1} ({2}, '{3}' size:{4})", _
                model.Number, model.Name, model.SysComment, _
                model.UserComment, model.Size)
        Next
        Log.WriteLine()

        ' Enumerate all loaded modules and display information
        Log.WriteLine("Additional libraries loaded:")
        Dim mo As XPRMModule
        For Each mo In mosel.Modules
            Log.WriteLine( _
                "  {0} (version {1}) used by {2} model(s)", _
                mo.Name, mo.Version, mo.NumberOfReferences)
        Next
    End Sub
End Module

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