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MS Office Forum / Outlook / Programming Add-Ins / July 2009PR_MESSAGE_CLASS is reset when calling Save() on item
Hello, I'm having several problems with my Outlook-Add-In and I would appreciate any help on this one. To show a custom icon for items of a certain folder I set the PR_MESSAGE_CLASS to the message class I created and the PR_ICON_INDEX to -1. Then because of the -1 a custom icon is shown and because of the custom message class it's the one I defined in the custom form. Very good. The problem starts when the user updates the item, either with an outlook inspector or with my custom windows form. After displaying the data in my custom windows form I persist the values, I write them back to the outlook item and call .Save(). That resets the MessageClass which is very odd I think because the item is not moved or something - I just saved it. Is this behaviour known or even wanted and if so, why? Thank you in advance for any help. Tobi This behaviour can simply be reproduced by creating a custom form, creating a folder and tell outlook to use the custom form. Create item, everything is fine. Restart outlook, open one of the items, save and the PR_MESSAGE_CLASS is gone. Oddly, outlook still opens the item with the correct (custom) form even though there is no information anywhere anymore that this is not a standard item. Is this just my outlook acting weird or am I doing something wrong? Thank you in advance. Tobi Is that custom form with that MessageClass published in Outlook? It sounds like the form isn't published and the items are one-offed. At any rate, just set the custom MessageClass again when the item is saved and make sure the custom form is published.  SignatureKen Slovak [MVP - Outlook] http://www.slovaktech.com Author: Professional Programming Outlook 2007. Reminder Manager, Extended Reminders, Attachment Options. http://www.slovaktech.com/products.htm > This behaviour can simply be reproduced by creating a custom form, > creating a folder and tell outlook to use the custom form. Create [quoted text clipped - 7 lines] > Thank you in advance. > Tobi On 30 Jul., 15:14, "Ken Slovak - [MVP - Outlook]" <kenslo...@mvps.org> wrote: > Is that custom form with that MessageClass published in Outlook? It sounds > like the form isn't published and the items are one-offed. [quoted text clipped - 19 lines] > > Thank you in advance. > > Tobi Thank you. After I designed the form I published (Outlook 07: "Publish Form As") and gave an appropriate name. Then I right click on a folder and assign that custom form to that particular folder. Then the strange behaviour. I create an item, everything is fine. Opening, saving, PR_MESSAGE_CLASS and the icon are correct. When I restart Outlook the moment I save the item the PR_MESSAGE_CLASS and the icon are gone. Strange, that can't be the desired behaviour, right? Funny thing, Outlook still opens the item, even though there's nothing left of my custom class, with that custim form. I'm hacking the PR_MESSAGE_CLASS back in but that can't be it. Do you mean a different kind of publishing? Tobi There's only one publishing that you'd use, Publish As and then selecting a library (Personal or Organizational) or publishing to a folder. As long as you only publish to one location and make sure to increment the Version property of the form (a string but can be used as if an int value) things are usually OK. It's possible there's some form of forms cache corruption, that should be eliminated first. Go to the Manage Forms dialog and click the button to clear the cache. At that time make sure the form is published to the desired location and no other. The folder default form property just make sure your custom form is used to create all new items in that folder. About the only other thing I can think of is to examine one of the problem items in a MAPI viewer such as OutlookSpy or MFCMAPI and see if you can spot any differences between it and an item that's OK. You aren't by any chance synching those items with some sort of PDA or IPod or IPhone or other device? If so that might be the cause of the problem if that synching software can't deal with custom form items and changes them back to the standard MessageClass. SignatureKen Slovak [MVP - Outlook] http://www.slovaktech.com Author: Professional Programming Outlook 2007. Reminder Manager, Extended Reminders, Attachment Options. http://www.slovaktech.com/products.htm <snip> Thank you. After I designed the form I published (Outlook 07: "Publish Form As") and gave an appropriate name. Then I right click on a folder and assign that custom form to that particular folder. Then the strange behaviour. I create an item, everything is fine. Opening, saving, PR_MESSAGE_CLASS and the icon are correct. When I restart Outlook the moment I save the item the PR_MESSAGE_CLASS and the icon are gone. Strange, that can't be the desired behaviour, right? Funny thing, Outlook still opens the item, even though there's nothing left of my custom class, with that custim form. I'm hacking the PR_MESSAGE_CLASS back in but that can't be it. Do you mean a different kind of publishing? Tobi |
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