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Using MapPoint In Delphi

Jack Melgers explains how developers can go about using MapPoint within Delphi and provides several code snippets

From the many postings, it's now commonly known that you can not use the MapPoint 2002 ActiveX-control in Delphi, youŽll end up with the message: 'No such interface supported'. Nevertheless, there are other ways for using MapPoint 2002 in Delphi and below IŽll give some comments.

1) Importing MapPoint_TLB

Start by importing the Type Library (TLB) in Delphi. Choose 'Import Type Library', select 'Microsoft MapPoint 9.0 Object Library', tick 'Generate Component Wrapper' and then click 'Install'. This will compile and build a Delphi package and as a result three MapPoint components will appear on the ActiveX-tab of the Component Palette: TApplication, TMap and TMapPointUtilities.

2) Using MapPoint TApplication as a component on the form

Create a new Delphi application and drop the MapPoint component TApplication on the Delphi-form. Make it visible in the Activate-event of the form. This will execute MapPoint in a separate window:

Doing so, you can access the MapPoint Object Model and start developing. For instance, get the ActiveMap and zoom to a location:

3) Creating a MapPoint.Map in an OleContainer

If you donŽt want MapPoint to execute as a separate application you can use TOleContainer in Delphi. Create a new Delphi application and drop an OleContainer component on the form, add MapPoint_TLB in the 'uses' section and add the following code to Activate-event of the form:

('MapPoint.Map.EU.9' is the OleClassName for the European edition of Mappoint and 'FMap' is a global variable of type _Map).

Note in general: If you can not properly access the MapPoint Application in Delphi, the cause maybe a conflict with the Delphi Application. Therefore, open the 'Mappoint_TLB.pas' and find the declaration of CoClasses and rename 'Application = _Application' to, for instance, 'Application1 = _Application'.

4) Accessing MapPoint Add-ins

If you have developed an Add-in (the MapPoint-Help gives a step-to-step explanation how to create an Add-in with Visual Basic) you can access it from Delphi.

Create a new Delphi application and drop a MapPoint TApplication on the form.

Declare the global variables:
- FAddIns : AddIns;
- FMyAddIn : OleVariant;

Connect to the add-in in the Activate-event of the form:

And disconnect in the Close-event of the form:

Now in the Delphi-application you can access methods in the Add-in. For instance:

You can also pass parameters to the Add-in. See the following example for passing two parameters of type integer:

Discuss this story in the forum.

Author: Jack Melgers
Jack Melgers is freelance consultant in Spain and he is involved with GIS development projects and training services.

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