Comparing CorelDRAW.Document Objects

Hello,

I'm pretty new in Corel programming so I hope I don't ask too ridiculous things but I start to like Corel Automation and getting into it step by step is fun.

I'm referencing Corel X4 with CSharp 2005 and wonder, what's the right way to compare Document Objects in like this situation:

List<CorelDRAW.Document> docs = new List<CorelDRAW.Document>();
CorelDRAW.Document doc = app.createDocument();
docs.add(doc);

I bind to the QuerySave Event like so:

app.QueryDocumentSave += new CorelDRAW.DIDrawApplicationEvents_QueryDocumentSaveEventHandler(onQueryDocumentSave);

And get successfully called on a save event in my function:

void onQueryDocumentSave(CorelDRAW.Document Doc, ref bool Cancel)
{
   // Doc is the document where the event happend. But what is the corresponding document in my list?
   foreach(CorelDRAW.Document d in docs)
   {
      if(d == Doc)
           // do sth

      if(d.Equals(Doc))
           // do sth
   }
}

I suspected that the == operator might be overloaded for Document so that Corel internally identifies it's docs but it does not seem to be the case. A name comparison can of course also not be done since it's not unique among the opened docs.

Any ideas on this?

Best,

-Jeff

[shelbym]

Hey Jeff welcome to the forum. I don't have C# on this machine, so I did a quick test in VBA, and the equals does work in VBA.

Private Sub GlobalMacroStorage_QueryDocumentSave(ByVal Doc As Document, Cancel As Boolean)
    Dim d As Document
    
    For Each d In Documents
        If d = Doc Then
            MsgBox "match"
        Else
            MsgBox "no match"
        End If
    Next d
End Sub

-Shelby

Hello Shelby,

thanks for looking into this! I narrowed it down further, even without the List, kind of like so:

// global scope:
CorelDRAW.Document my_doc = null;

// --- then in a func:
CorelDRAW.Application app = new CorelDRAW.Application();
app.Visible = true;
app.QueryDocumentSave += new CorelDRAW.DIDrawApplicationEvents_QueryDocumentSaveEventHandler(onQueryDocumentSave);

my_doc = app.CreateDocument();
doc1.Name = "My Doc";

with event func:

void onQueryDocumentSave(CorelDRAW.Document Doc, ref bool Cancel)
{
   if(my_doc == Doc)
         MessageBox.Show(Doc.Name);
}

Which does not work either. I think the reason might be that the Parameter "Doc" is not being passed by "ref" so I don't get the original Document Objects but a copy and therefore the comparison fails.

So I'm definitely missing something, there sure must be a way to compare documents but I don't understand why Corel gives me a copy of the source Document where the event happend.

Best,

-Jeff

UPDATE: at last I found the Property

CorelDRAW.Document.MetaData.DocID

so this obviously is the right way to compare two Documents if they are different Objects (which automatically is the case in Event handling since Corel does not pass them by ref in CSharp):

if(doc1.Metadata.DocID == Doc.Metadata.DocID)
    // do sth...