MapBasic DLL

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The rwnet4.dll is aimed for use with MapInfo / MapBasic.

 

Since MapInfo is a single user application, we have made several changes to make development easier.

 

Rather than doing Create/Free methods, we use pre-allocated objects.

Objects are referenced either indirectly (single instance) or by their index (multi instance).

 

Classes referenced indirectly:

 

TCalc / TRouteCalc

TDrivingDirections

TGISwrite

TImport

TImportAttributes

TNetwork

TOptimizer

TPolyGeneration

TRandom

TRoadClassSpeed

TRoadClassTurnCost

TRoute

TSpatialSearch

TStepList

TTrafficList

TTSP

TTSPcurb

TVoronoi

 

Classes / types referenced by index (handle):

 

 

Number of instances

Null-element

TApproachArray

2

 

TBitArray

3

Yes

TCostArray

2

Yes

TCurbMatrix

1

 

TFloatPointArrayEx

2

 

TIntegerArray

2

 

TIntegerList

2

Yes

TLocationList

2

Yes

TMatrix

2

 

TStringList

2

Yes

TWordArray

2

 

 

If null-element is true, you can pass 0 as index / handle, when you want to pass nil as parameter.

 

Function naming convention

TImport.Execute becomes TImport_Execute.

TCalc.IsoCost becomes TCalc_IsoCost.

etc.

 

Some method names have been shortened due to max length = 31 characters.

TCalc and TRouteCalc are both referenced as TCalc.

 

All definitions can be seen in the rwnet4.def file along with a sample application, covering key areas.

 

Two versions exists:

rwnet4_32.def for MapInfo 10.0-15.0

rwnet4.def for MapInfo 15.2.2 and up.

 

Password initialization

Call method "InitPassword".

 

Codepage

Since RW Net 4 is Unicode enabled and Mapbasic isn't, it is required to do an internal conversion in all function calls involving strings.

This is handled automatically through a global variable, which sets the codepage you are using in MapBasic.

Default is the system codepage.

Methods: GetCodepage / SetCodepage.

 

GIS output format

There is a global variable for output format, which is gfMITAB by default.

This means it is skipped from all function calls having a gisformat parameter.

Methods: GetGISformat / SetGISformat.

 

CharacterSet

You can get the current codepage for your table by calling function CharSet2CP, where you pass the return value from TableInfo(tableid,TAB_INFO_CHARSET).

Then call TNetwork_SetCodepage to define which codepage is used in all output - also from TDrivingDirections etc.

 

Colours are read/set in MapInfo colour format (RGB <> BGR), while the .NET and VCL versions uses windows colour scheme.

 

Error handling

If an error happens when calling a method, you can use one of these 2 functions to test it:

GetLastExceptionClass

GetLastExceptionMessage

The messages are cleared after each successful method call.

 

Progress Events

These can all be turned on/off by calling ShowProgress with 0/1 as parameter.

The progress is then shown with a built-in dialog.

 

Missing functionality compared with VCL / .NET version

GISarray output as format

Direct access to TPolyGeneration