Question

Obtain property value by name

Asked by: EddieShipman

Need to access Appointment property by propertyname.
How to do that?

Let's say I want to write a function and pass a property name and then
return the value of the property. VBA will work but I prefer Delphi code...

function getPropValue(Propname: String): Variant;
begin
  Result := AppointmentItem. ?????
end;

                                  
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Asked On
2009-07-08 at 09:22:58ID24553745
Topic

Outlook Groupware Software

Participating Experts
2
Points
0
Comments
11

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Answers

 

by: BlueDevilFanPosted on 2009-07-08 at 09:43:29ID: 24805692

Hi, EddieShipman.

Sorry, I don't know Delphi.  The way to do this is to use the ItemProperties collection.  In VBA it would be something like this

Function getPropValue(Appointment As Object, Propname As String) As Variant
    getPropValue = Appointment.ItemProperties.Item(Propname)
End Function

This may not work for all properties.  

 

by: EddieShipmanPosted on 2009-07-08 at 10:23:05ID: 24806061

Sorry, but ItemProperties is not exposed in the Outlook object model that Delphi uses.

 

by: BlueDevilFanPosted on 2009-07-08 at 10:37:09ID: 24806202

Interesting.  I would have thought there'd be a single object model regardless of language.  

 

by: matthewspatrickPosted on 2009-07-08 at 10:56:29ID: 24806382

Hello EddieShipman,

One small warning about BDF's (very clever!) approach: if the property returns an object, then at least in
VBA it would cause an error, as object variable require the Set statement, and not the (implicit) Let that
BDF used.

Like BDF, I've never worked in Delphi, so I have no idea whether or not that would be an issue :)

Regards,

Patrick

 

by: EddieShipmanPosted on 2009-07-08 at 12:23:23ID: 24807242

Yeah, it is when I import the Outlook TypeLib but not in Outlook2000.pas included with Delphi, go figure.

 

by: EddieShipmanPosted on 2009-07-08 at 12:32:27ID: 24807340

Now, is this ItemProperties Outlook2007 specific or was it avail in older versions?

 

by: BlueDevilFanPosted on 2009-07-08 at 15:10:55ID: 24808940

It is not specific to Outlook 2007.  I know it is available in 2003 also.  Not sure about Outlook version before that.

 

by: BlueDevilFanPosted on 2009-07-08 at 15:13:36ID: 24808963

Good point, Patrick.

 

by: EddieShipmanPosted on 2009-07-08 at 15:28:51ID: 24809086

I may be able to access the property using GetIDsofNames and Invoke on the IDispatch of the _AppointmentItem
class.

 

by: EddieShipmanPosted on 2009-07-09 at 07:09:06ID: 24813808

Here's how to do it in Delphi:

const
  EmptyDispParams: TDispParams = (rgvarg: nil; rgdispidNamedArgs: nil; cArgs: 0; cNamedArgs: 0);
 
var
  iLCID: Integer;  // you might init this to LOCALE_USER_DEFAULT
 
function GetDispId(const Obj: IDispatch; const Member: WideString; DispIdPtr: PInteger): Boolean;
begin
  Result := Succeeded(Obj.GetIdsOfNames(GUID_NULL, @Member, 1, iLCID, DispIdPtr));
end;
 
function InvokePropertyGet(const Obj: IDispatch; Name: WideString):Variant;
var
  TheDispId, ArgErr: Integer;
  DispParams: TDispParams;
begin
  if GetDispId(Obj, Name, @TheDispId) then
    begin
      DispParams := EmptyDispParams;
      OleCheck(Obj.Invoke(TheDispId,
                          GUID_NULL,
                          iLCID,
                          DISPATCH_PROPERTYGET,
                          DispParams,
                          @Result,
                          nil,
                          @ArgErr));
    end;
end;
 
 
// Usage:
 
var
  AApptCompareFieldValue: Variant;
  OutlookPropertyName: WideString;  
begin
  iLCID := LOCALE_USER_DEFAULT;
  OutlookPropertyName := 'LastModificationTime';
  AApptCompareFieldValue := InvokePropertyGet(AOutlookAppointmentItem, OutlookPropertyName);
  Showmessage(AApptCompareFieldValue);
end;
  

                                              
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by: BlueDevilFanPosted on 2009-07-09 at 08:32:26ID: 24814752

Glad you worked it out.  

20120131-EE-VQP-002

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