topic Re: can't GetObjectFromFullName with IGxCatalog in ArcObjects SDK Questions

can't GetObjectFromFullName with IGxCatalog

EvanThoms — Thu, 28 Jul 2011 22:05:19 GMT

In an ArcMap addin I have the code:

Dim gxCat As IGxCatalog
Dim pObj As IGxObject
Dim x As Long

gxCat = New GxCatalogClass

pObj = pObj = gxCat.GetObjectFromFullName(sPath, x)

But the last line trips the error - Cannot convert to 'Interface IGxObject', but that's exactly what the function is documented to do.

I know the path is good (tried a few) and I think I am getting a valid catalog object, I mean, I can do things with it like make a folder connection.

Furthermore, on my previous computer, this same addin and this same chunk of code never threw an error.

BTW, what I am trying to do is, from a full path to an object, determine first if the path leads to a valid ArcCatalog object and then what the datase type of that object is, so if there is another way beside getting to IGxDataset.Dataset.Type I would appreciate it.

Thanks

Re: can't GetObjectFromFullName with IGxCatalog

NeilClemmons — Fri, 29 Jul 2011 12:07:00 GMT

This line is incorrect:
pObj = pObj = gxCat.GetObjectFromFullName(sPath, x)

It should be:
pObj = gxCat.GetObjectFromFullName(sPath, x)

Also, GetObjectFromFullName may return an IGxObject reference or an IEnumGxObject reference. Your code should handle the possibility of both. See the developer help for more info and for an example.

Re: can't GetObjectFromFullName with IGxCatalog

amrutabildikar1 — Fri, 29 Jul 2011 18:02:19 GMT

Hi,

You can refer following VBA example to implement the functionality.
I think you can try to get full name from GetObjectFullName into a variant type of variable.

Sub GetObjFromFullname()
Dim pApp As IGxApplication
Set pApp = Application
Dim pCat As IGxCatalog
   Set pCat = pApp.Catalog
   Dim pGxObject As IGxObject
Dim numFound As Long
Dim v As Variant
Set v = pCat.GetObjectFromFullName("C:\data\parcels.shp", numFound)    'Assuming the above pathname is valid
   If numFound = 1 Then
   Set pGxObject = v
Else
Dim pEnumGxObject As IEnumGxObject
       Set pEnumGxObject = v
   Set pGxObject = pEnumGxObject.Next
   End If
End Sub

I hope this helps!

Good luck!

Re: can't GetObjectFromFullName with IGxCatalog

EvanThoms — Mon, 01 Aug 2011 17:08:07 GMT

Thanks!
Yes, I did find an example of testing for a single or an enumeration reference and it turns out the function is returning an enumeration of three references, all to the exact same object, in this case a tif file (also tried a .asc), which I presume is just one object. And this is probably why my code worked on a different build; it was always only returning a single reference. So, why am I getting three now?

Re: can't GetObjectFromFullName with IGxCatalog

EvanThoms — Mon, 01 Aug 2011 20:24:24 GMT

And another weird thing is happening I didn't at first think was related. When

pObj = gxCat.GetObjectFromFullName(sPath, numFound)

is called, an unnamed .prj file appears in the folder alongside the mxd that has the addin with the spatial reference of the tif file at the end of sPath.