MapForums

Hi,
I'm new to Mappoint 2004. I'm trying to use importdata from a query in an access mdb to create shaded areas with visual basic6. I obtain always a map with pushpin. I'm aggregating regional datas that i'm able to create in a shaded area with manual wizard. Do you know why?

Thanks
Max

Hey Max

In VB to get to where you want to be it is a two step process. One link the data to get it into a DataSet Object and two execute a DisplayDataMap Method on that DataSet Object

This is the syntax:

object.DisplayDataMap([DataMapType], [DataField], [ShowDataBy], [CombineDataBy], [DataRangeType], [DataRangeOrder], [ColorScheme], [DataRangeCount], [ArrayOfCustomValues], [ArrayOfCustomNames], [DivideByField], [ArrayOfDataFieldLabels], [ArrayOfPushpinSymbols])

It takes major fussing with this method to get a DataMap that looks pretty. Look it up in VB Help to get the settings required.

Post your code here and maybe we can see if there is problem with what you are doing.

Ciao,

__________________
Calv1ns

The code is something like this, but i always receive "parameter is incorrect" in method DisplayDataMap.

Thanks for help!!


myExampleArray(0, 0) = "tot"
myExampleArray(0, 1) = geoFieldInformation

myExampleArray(1, 0) = "PROVINCIA_AVV"
myExampleArray(1, 1) = geoFieldRegion2

Set objDs = objMap.DataSets.ImportData("C:\Mp.mdb!Query_SinApe ", myExampleArray, geoCountryItaly, geoDelimiterDefault, geoImportAccessQuery)

Set obField = objDs.Fields("provincia_avv")

Set objMap = _
objDs.DisplayDataMap(geoDataMapTypeShadedArea, _
obField, geoShowByCity, geoCombineByDefault, _
geoRangeTypeDiscreteEqualRanges, geoRangeOrderDefault, 15)

I wrote geoShowbycity instead of geoShowByRegion2; anyway I have the same result.

After a quick look max

1) I always run the subscripts on the Fields Array from 1 to n and not 0 to n-1

2) are you declaring your varriables? Maybe something is set by default to variant when it needs to be a specific type.

Here is some code that does work:

Public Sub example()

Dim this_datamap As MapPoint.DataMap
Dim this_field As MapPoint.Field
Dim wk_DSs As MapPoint.DataSets
Dim wk_ds As MapPoint.DataSet
Dim wk_dbs As Database
Dim wk_dsname As String
Dim wk_fields(1 To 8, 1 To 2) As Variant

wk_fields(1, 1) = "Name"
wk_fields(2, 1) = "EventID"
wk_fields(3, 1) = "wk_DateTime"
wk_fields(4, 1) = "Latitude"
wk_fields(5, 1) = "Longitude"
wk_fields(6, 1) = "AVLID"
wk_fields(7, 1) = "Speed"
wk_fields(8, 1) = "Heading"

wk_fields(1, 2) = geoFieldData
wk_fields(2, 2) = geoFieldData
wk_fields(3, 2) = geoFieldName
wk_fields(4, 2) = geoFieldLatitude
wk_fields(5, 2) = geoFieldLongitude
wk_fields(6, 2) = geoFieldData
wk_fields(7, 2) = geoFieldData
wk_fields(8, 2) = geoFieldData
wk_dsname = "my Truck"

'Opens a map and sets the global myobj as a MapPoint.Map
wk_istat2 = Open_Map("...\My Documents\test.ptm")

Set wk_dbs = CurrentDb()

wk_qry = wk_dbs.Name & "!avlhistory"
Set wk_DSs = myobj.DataSets

Set wk_ds = wk_DSs.LinkData(wk_qry, "eventid", wk_fields, geoCountryCanada, , geoImportAccessQuery)
wk_DSs.item(1).Name = wk_dsname

Set this_field = wk_ds.Fields.item( 8 )
Set this_datamap = wk_ds.DisplayDataMap(geoDataMapTypeShadedArea, _
this_field, geoShowByCensus1, geoCombineByCount, _
geoRangeTypeDiscreteEqualRanges, geoRangeOrderDefault, 3, 4)

End Sub

Ciao,

__________________
Calv1ns

Hi,
I am trying to work with the awesome code sample you posted but there is one bit I do not understand. and that is Open_Map("...\My Documents\test.ptm")

Is Open)Map a function you built if so can you post that or explain what sysntax you use to open a map, Thanks

Bruce