Lotus Notes : How to limit the extension file type in the dialog box of the rich text lite field using thumbnails only? - jpeg

Question

Here is my problem: i have a rich text lite field, used to store a contact photo. Parameter of this field is:
- only allow for thumbnail with an image attachment name (mandatory) = ContactPhoto
Parameter of the Rich Text Lite
When the user clicks on it, a standard import dialog box (managed automatically by Notes) is open and all images type can be selected as shown here :
ScreenShot of the import dialog box
With the following code, I'm able to check the size of the photo:
Set uidoc=ws.CurrentDocument
Call uidoc.Refresh(True,True)
Set doc=uidoc.Document
oneKB = 1024
PhotoTrouve = False
Forall i In doc.Items
If i.type = Attachment Then
Set emb = doc.GetAttachment(i.values(0))
If emb.source="ContactPhoto" Then
PhotoTrouve = True
If emb.filesize > (50 * oneKB) Then
strError="The size of the photo should be less than 50 Kb."
End If
End If
End If
End Forall
If PhotoTrouve= False Then
strError="Photo is mandatory."
End If
But this is not enough. I also need to check if this is well a .jpg file. The problem is that, as this is a thumbnail, its name is ContactPhoto, without any extension and i don't know how to get the original extension of the file selected by the user (seems not to be possible).
So my question is : is it possible to force the standard dialog box of the "thumbnail rich text lite" field in order that it proposes only .jpg extension file type to the user ? How to ?
Or if not, do you know a solution to check that the original file is well a .jpg file ?
Note : even if I name the attachment CPhoto.jpg (instead of ContactPhoto) by example, the user can select all type of images, not only a jpg. The photo is saved in $FILE of the document under the name of CPhoto.jpg but I don't think that the file is finally a real .jpg format. And I absolutely need a jpg image as my final objective is then to export that image in an xml file, with the good format of jpg.
Thanks a lot for your replies and help.
Karen

Answer 1

You will have to translate it from C#, but code to check the file contents to see if it is a jpg can be found in this answer to a previous question on this site.