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2 Problems with COM

Posted on 2002-04-24
Medium Priority
Last Modified: 2010-04-04
i used a TLB to get control over a COM, but have two problems :

1.) I get an error with this parameter

  PrivateAlias1 = array[0..14] of Double; {*}

    procedure GetElement(Ele: PrivateAlias1); safecall;
    procedure SetElement(Ele: PrivateAlias1); safecall;

Error : Illegal type in OLE automation section 'PrivateAlias1'

2.) How can i use the events ?
i got following
  _IDocumentEvents = dispinterface
    procedure AfterDocumentPrint; dispid 3;
    procedure AfterDocumentSave; dispid 4;
    procedure BeforeDocumentClose; dispid 8;
    procedure BeforeDocumentPrint; dispid 9;
    procedure BeforeDocumentSave; dispid 10;
    procedure OnLeftMouseClick(X: Double; Y: Double; Z: Double); dispid 13;
    procedure OnDocumentMerge(const MergeFileName: WideString); dispid 21;
    procedure OnMachineModeChange(MachineMode: espMachiningMode); dispid 22;
    procedure OnActiveWorkCoordinateChanged(const WorkCoordinate:
IDispatch); dispid 33;
    procedure OnMachineSetupChanged; dispid 38;

but how can i use them ?
Question by:Dev6
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LVL 12

Expert Comment

ID: 6965018
type PrivateAlias1 = array[0..14] of Double;
you might already have this .. dunno

for the events simply set them to some procedure

var DocEvents: _IDocumentEvents;
  // do your interface initialization
  // set the event handler

procedure TForm1.DoMachineModeChange(MachineMode: espMachiningMode); ;
  // some event handler code

Author Comment

ID: 6965121
what do you mean with the first answer ? ("you might already have this .. dunno")

2nd question :
how to initialize the interface for the events ?
LVL 14

Expert Comment

ID: 6965136
You may want to use
     type PrivateAlias1 = array of Double;
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Author Comment

ID: 6965151
i get the same error
trying to save :
"Out parameters requires pointer type"

Expert Comment

ID: 6965218
1: An array of double is not COM-compatible. U should use a SafeArray or a Variant instead.

2: I think you would have to implement the _IDocumentEvents-interface in your client an link it to the server at runtime. Then the server will notify your client in case of any event. Its up to your client, to handle the events then.

Maybe it would help to see the complete interface-definition of the tlb.




Expert Comment

ID: 6965234
1: An array of double is not COM-compatible. U should use a SafeArray or a Variant instead.

2: I think you would have to implement the _IDocumentEvents-interface in your client an link it to the server at runtime. Then the server will notify your client in case of any event. Its up to your client, to handle the events then.

Maybe it would help to see the complete interface-definition of the tlb.




Accepted Solution

xsoft earned 800 total points
ID: 6965242
More information about COM-events and how to use them is availible here:


You will also find a nice tool -EventSinkImp- which will make creating event sink components very easy.
LVL 12

Expert Comment

ID: 6965986
>>you might already have this .. dunno<<
I meant that you might already have the array declared as a type
to create an interface you usualy use CoCreateInstance
if the events interface is a part of some other interface then use QueryInterface on the 'owner' interface

Expert Comment

ID: 6975535
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