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Anonymous · #1 (**permalink**) 10-27-2004

Mappoint has a number of methods that require ArrayOfFields: These Include:

ImportData
LinkData
ImportTerritories
LinkTerritories
SetFieldsVisibleInBalloon

My problem is I don't seem to be able to create the Variant array properly
Has anyone had any experience with this problem?

**Winwaed** · #2 (**permalink**) 10-28-2004

Hi Garry,

After our emails, I remembered a program I wrote that did work with fields. I've had a look at it, and it only queries the fields of existing pushpins. I don't use ArrayOfFields, but if you think it would help I could post it. (I use the getItem method on a Fields object)

Could the polyline/polygon variant code be modified so that they pass "an array of Field" objects rather than "array of Location" objects?

Richard

Anonymous · #3 (**permalink**) 10-28-2004

Alas - that is precisely where I started - I've been trying to use the SafeArray code but I get nowhere.

Anonymous · #4 (**permalink**) 10-29-2004

I have managed to get SetFieldsVisibleInBalloon working using C++.

Deriving some code from Richard Marsden proved to be the solution.

FieldsPtr pFields = pDataSet->Fields;
long i;
int count = pFields->Count;
FieldPtr pField;
Variant index = 0; // CBuilder variant
HRESULT hr;

VARIANT v;
SAFEARRAY FAR* psa;
SAFEARRAYBOUND saBound;

saBound.cElements = count;
saBound.lLbound = 0;
psa = SafeArrayCreate( VT_DISPATCH, 1, &saBound );

VariantInit( &v );
V_VT( &v ) = VT_ARRAY + VT_DISPATCH;
V_ARRAY( &v ) = psa;

for ( i = 0; i < count; i++ )
{
index = i + 1;
pField = pFields->get_Item( index );
hr = SafeArrayPutElement( psa, &i, pField );
}

pDataSet->SetFieldsVisibleInBalloon( v );

**Eric Frost** · #5 (**permalink**) 02-15-2007

I realize this is from July '02, but I am trying to use this code and getting stuck with

Code:

 
Variant index = 0; // CBuilder variant

I am using Visual C++. I really just want one Field passed to the DisplayDataMap method for the second parameter, I don't really need an array of fields.

**Eric Frost** · #6 (**permalink**) 02-15-2007

Here's my code below.

See the second parameter, this is where I get hung up.

It says it will default to the first valid field, so I put the column I want to map as the first field.

How can I simply specify the default for the DataField parameter?

Thanks,
Eric

Code:

 
oDSPtr->DisplayDataMap(MapPoint::geoDataMapTypeMultipleSymbol, NULL, MapPoint::geoShowByDefault,
MapPoint::geoCombineByNone, MapPoint::geoRangeTypeUniqueValues, 
MapPoint::geoRangeOrderDefault, MapPoint::geoColorSchemeDefault, 5);
 
// [ArrayOfCustomValues], [ArrayOfCustomNames], [DivideByField], [ArrayOfDataFieldLabels], [ArrayOfPushpinSymbols]);

DrNobody · #7 (**permalink**) 02-16-2007

Hi,
perhaps it helps You:

//from my program
.....

Code:

void CMapPage::ShowParkPoints()
{
try
{
if(m_bShowPark)
{
m_dsParkPoints = m_DataSets.ImportData(m_strParkPointsPath, NULL, 
geoCountryDefault, geoDelimiterDefault, NULL);
m_dsParkPoints.SetSymbol(20);
int nRecordCount = m_dsParkPoints.GetRecordCount ();
if(nRecordCount == 0)
{
//AfxMessageBox (_T("There are no \"Park\" points"), MB_ICONINFORMATION);
return;
}
COleSafeArray saFields;
saFields.CreateOneDim (VT_DISPATCH, 4);
long lIndex[1];
CFields colFields = m_dsParkPoints.GetFields ();
CField objField;
for(int i = 0; i < 4; i ++)
{
lIndex[0] = i;
objField = colFields.GetItem(COleVariant((long) (i + 2)));
saFields.PutElement (lIndex, objField.m_lpDispatch);
}
m_dsParkPoints.SetFieldsVisibleInBalloon (saFields);
m_DataSets.ZoomTo ();
}
else
m_dsParkPoints.Delete();
} //try
catch (COleDispatchException * pExpn)
{
#ifdef _DEBUG
pExpn->ReportError ();
#endif
pExpn->Delete ();
}
}

......

**Eric Frost** · #8 (**permalink**) 02-16-2007

Thank you Dr.!

Pit Mueller · #9 (**permalink**) 12-20-2007

Hi Dr. Nobody!

I'm still having the same problems. Have you suceeded in adding the fieldlist to ImportData?

Pit

Quote:

Originally Posted by DrNobody

Hi,
perhaps it helps You:

//from my program
.....

Code:

void CMapPage::ShowParkPoints()
{
try
{
if(m_bShowPark)
{
m_dsParkPoints = m_DataSets.ImportData(m_strParkPointsPath, NULL, 
geoCountryDefault, geoDelimiterDefault, NULL);
m_dsParkPoints.SetSymbol(20);
int nRecordCount = m_dsParkPoints.GetRecordCount ();
if(nRecordCount == 0)
{
//AfxMessageBox (_T("There are no \"Park\" points"), MB_ICONINFORMATION);
return;
}
COleSafeArray saFields;
saFields.CreateOneDim (VT_DISPATCH, 4);
long lIndex[1];
CFields colFields = m_dsParkPoints.GetFields ();
CField objField;
for(int i = 0; i < 4; i ++)
{
lIndex[0] = i;
objField = colFields.GetItem(COleVariant((long) (i + 2)));
saFields.PutElement (lIndex, objField.m_lpDispatch);
}
m_dsParkPoints.SetFieldsVisibleInBalloon (saFields);
m_DataSets.ZoomTo ();
}
else
m_dsParkPoints.Delete();
} //try
catch (COleDispatchException * pExpn)
{
#ifdef _DEBUG
pExpn->ReportError ();
#endif
pExpn->Delete ();
}
}

......

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C++ and passing Variant Arrays

C++ and passing Variant Arrays

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