uuciks@swbatl.sbc.com (Kristina Smith - UCI - 5-3793) (06/06/91)
Has anyone ever seen this behavior before? (Please note that I am an X11 and Motif programming novice) (I'm running Motif 1.1) I create a selectionBoxDialog like this: selectionBox = XmCreateSelectionDialog(parent,"selectionBox",args,argcnt); I create an XmStringTable filled with data and use XtSetArgs to make it the item list for the selection box like this: XtSetArg(args[argcnt], XmNlistItems, (XmStringTable)items); argcnt++; XtSetArg(args[argcnt], XmNlistItemCount, (int)itemcount); argcnt++; One of the pushButtons has a callback tied to it that deletes the current list and adds new items to the list somewhat like the following: XtUnmanageChild(list); XmListDeleteAllItems(list); XmListAddItem(list,xmstring,0); XtManageChild(list); Then when I try to select an item from the new list it coredumps with a memory fault (segmentation violation) (not all the time, though. It's very sporadic) When I use a debugger on it, and do a trace, this is what shows up: _DrawHighlight(0x1ac2a8,0x3,0x1,0x1,0x20000,0x3) + c4 _ListFocusIn(0x1ac2a8,0xf7ffe7e4,0x0,0x19ad78,0x25,0x26838) + b0 __XtTranslateEvent(0x1ac2a8,0x0,0xf7ffe7e4,0x630,0x174d74,0x19ad70) + 360 _DispatchEvent(0xf7ffe7e4,0x1ac2a8,0x200000,0x0,0xf7ffe588,0xf7ffe3f8) + 328 Does anyone know what is happening or why it might be happening? I would appreciate any thoughts or experiences at all! I'm on a tight deadline, and I can't seem to get past this! Thanks! Kristina Smith kms@strider.sbc.com 314-235-3793 Southwestern Bell Telephone
sdl@d74sun.lyra.mitre.org (Steven D. Litvinchouk) (06/09/91)
In article <1991Jun5.182759.23939@swbatl.sbc.com> uuciks@swbatl.sbc.com (Kristina Smith - UCI - 5-3793) writes: > Has anyone ever seen this behavior before? > I create a selectionBoxDialog like this: > > selectionBox = XmCreateSelectionDialog(parent,"selectionBox",args,argcnt); > > XtUnmanageChild(list); > XmListDeleteAllItems(list); > XmListAddItem(list,xmstring,0); > XtManageChild(list); > > Then when I try to select an item from the new list it coredumps > with a memory fault (segmentation violation) (not all the time, > though. It's very sporadic) > > When I use a debugger on it, and do a trace, this is what shows up: > _DrawHighlight(0x1ac2a8,0x3,0x1,0x1,0x20000,0x3) + c4 > _ListFocusIn(0x1ac2a8,0xf7ffe7e4,0x0,0x19ad78,0x25,0x26838) + b0 > __XtTranslateEvent(0x1ac2a8,0x0,0xf7ffe7e4,0x630,0x174d74,0x19ad70) + 360 > _DispatchEvent(0xf7ffe7e4,0x1ac2a8,0x200000,0x0,0xf7ffe588,0xf7ffe3f8) + 328 We have encountered *exactly* the same problem. There appear to be not one, but two separate bugs in the Motif XmList code: 1. Deleting all selected items from an unmanaged XmList can cause a segmentation fault crash. Workaround: instead of deleting all items, and then adding items as you have it, instead *first* add the new items (appended to the end of the list), and *then* delete the old items--in this way you never delete all items, so no crash. 2. In a scrolled list, deleting the first item (I don't remember if it needs to be selected) if the first item has been scrolled so that it isn't visible will also cause a crash. Workaround: scroll the list so that an item is visible when it is deleted. By the way, we've also been having *lots* of trouble with the Motif clipboard. Anyone else in the same boat? -- Steven Litvintchouk MITRE Corporation Burlington Road Bedford, MA 01730 (617)271-7753 ARPA: sdl@mbunix.mitre.org UUCP: ...{att,decvax,genrad,necntc,ll-xn,philabs,utzoo}!linus!sdl "Where does he get those wonderful toys?"
carl@gemini.UUCP (carl) (06/14/91)
Hi out there. I have a problem with the List widget that perhaps someone out there can help with: There are numerous _convenience_ functions (OSF/Motif developers - please go to your nearest dictionary and look that word up) for selected items. You can unselect some or all (how USEFUL) but that apparently does nothing more than turn off the hilite. What good is that? How come there isn't a function to DELETE the selected items from the list. Now THAT would be useful. The problem that I am experiencing is even after retrieving the selectedItems and selectedItemCount resources, I cannot use the returned values as arguments to XmListDeleteItem(). Is this just a bug in 1.1? Also, I have a list widget on a bulletin board, and I want to change its' x/y position via XtSetValues(). This also does not work. Is the documentation wrong where it says that the position CAN be changed with SetValues? Thanks for your help. BTW, If Motif is any indication, imagine what an operation system produced by OSF will be like :-)! carl.