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Cannot find callback list in XtAddCallback
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 Cannot find callback list in XtAddCallback - May 31, '06, 11:28:13 AM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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Now I am getting "Warning Cannot find callback list in XtAddCallback" and the program locking up on me.
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RE: Cannot find callback list in XtAddCallback - May 31, '06, 1:35:27 PM
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Rodney
Posts: 3728
Joined: Jul. 9, '02,
From: /Tools lab
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Check that the widget is specified correctly and/or that the callback_name is valid.
Either the callback_name is correct, but the wrong widget is specified, or the
right widget is specified but the callback_name doesn't exist. It's more likely
the latter.
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RE: Cannot find callback list in XtAddCallback - May 31, '06, 3:04:18 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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This program has been compiled and run with X11R5 package, under the latest interix before MS bought them. Only thing I did is recompiled it with new X11R6 under SFU.
I have been browsing the web for this warning, I found a lot of them. So many people had the same problem from different platforms.
This issue is not that I made a mistake in my program (which I didn't write and is still running if don't recompile it), it is that another issue with old and newer version of Motif incompatibility.
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RE: Cannot find callback list in XtAddCallback - May 31, '06, 5:24:13 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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quote:
Warning Cannot find callback list in XtAddCallback
I went through looking for XtAddCallback () function call and listed all the callback functions it was calling. They are all in the directory I am working in. There is only one function was not in my directory is: XmProcessTraversal(). Is there any issue with this function and it's been called in XtAddCallback().
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 7:16:59 AM
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Rodney
Posts: 3728
Joined: Jul. 9, '02,
From: /Tools lab
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It's not the function name that's the issue. It's the callback name.
From the man page:
void XtAddCallback(w, callback_name, callback, client_data)
Widget w;
String callback_name;
XtCallbackProc callback;
XtPointer client_data;
So it's the second arg -- the list being appended to -- that needs to be verified.
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 11:11:52 AM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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Thanks for the new direction.
Here is what I found:
The second arguments in XtAddCallback ( ) are:
XmNactivateCallback
XmNlosingFocusCallback
XmNmodifyVerifyCallback
XmNvalueChangedCallback
XmNdefaultActionCallback
XmNmultipleSelectionCallback
XmNbrowseSelectionCallback
XmNexposeCallback
XmNresizeCallback
XmNdestroyCallback
The program makes 1068 calls to XtAddCallback ( ) function.
This must be the list we are having trouble to find. My argument is that how come, older version of the program has no problem with it and I am having this when I compile it now?
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 12:23:02 PM
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Rodney
Posts: 3728
Joined: Jul. 9, '02,
From: /Tools lab
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>My argument is that how come, older version of the program has no problem with it and I am having this when I compile it now?
One of the names may have changed.
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 12:35:18 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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Thanks Rodney. Still, the answer doesn't solve this problem.
How can I found out which name is changes. The list of the names are Motif names. There has to be some documentaion somewhere about what is changes what is kept.
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 2:02:10 PM
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Rodney
Posts: 3728
Joined: Jul. 9, '02,
From: /Tools lab
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... or a correct name may be getting used with a widget that doesn't have this list.
Each man page has a list of valid callback names. For example XmCascadeButton's man page.
It's difficult for me to say "thus" and there's the problem. There's context with it as
well. I don't know of a page mapping Motif 1 to Motif 2 callbacks.
I don't use Motif on a day-to-day basis, so anyone else who want to add a few cents then please do.
You can try setting some breakpoints at functions in the code to give you a stack that you can
then walk up when the error message appears to get the Callback name and where in your code it is started from.
(I'm away for a couple of days and won't be able to answer for a while).
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RE: Cannot find callback list in XtAddCallback - Jun. 1, '06, 4:26:32 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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Have fun.
I just check the man page for XtAddCallback () again, there is not a list of valid callback names. I ordered some books. Hoping they might help but the latest books for X11R5 not for X11R6. I don't know how much the books for older version will help me.
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RE: Cannot find callback list in XtAddCallback - Jun. 5, '06, 11:41:47 AM
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Rodney
Posts: 3728
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From: /Tools lab
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No, no -- I didn't write about the XtAddCallback manual page.
The XtAddCallback page isn't going to have a list because it's a widget indep API.
The list of callback names is widget specific.
So you need to refer to each widget manual page for a callback list for that widget.
XmCascadeButton's man page is an example.
Motif 2 does make X11R6 a base requirement. I'm surprised there hasn't been a book
released on it that you can find.
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RE: Cannot find callback list in XtAddCallback - Jun. 6, '06, 10:53:40 AM
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cerenaksu
Posts: 49
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I think I found one book which would tell me the differences between X11R5 and R6. Rest of the books I have for X11R5. The name of the books is "Programmer's Suplement for Release 6". I ordered it but haven't got the book yet.
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RE: Cannot find callback list in XtAddCallback - Jun. 6, '06, 7:04:24 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
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I found this answer to the question I have been trying to find answer by Ken Lee
"What does this mean: Warning: Cannot find callback list in XtAddCallback?
Answer: It means that you gave an invalid callback name to XtAddCallback, e.g., using XmNactivateCallback when the widget does not have a callback with that name.
on the web address: http://www.faqs.org/faqs/motif-faq/part9/section-47.html"
Now if this is the correct answer, how come this program runs perfectly with older Motif (X11R5)and Interix? Is there somewhere Motif thinkers changed the list of callbacks for the Widgets in X11R6?
I am digging through the 2000 page program (I am not kidding) and checking each widget and their callback list.
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RE: Cannot find callback list in XtAddCallback - Jun. 6, '06, 9:55:39 PM
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Rodney
Posts: 3728
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From: /Tools lab
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That's what I said back about a week ago.
Quote:
> Either the callback_name is correct, but the wrong widget is specified, or the
> right widget is specified but the callback_name doesn't exist. It's more likely
> the latter.
You write:
> I am digging through the 2000 page program (I am not kidding) and checking each widget and their callback list.
You can automate this with scripts to reduce the duplicates you have to check.
It'll save you time.
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RE: Cannot find callback list in XtAddCallback - Jun. 7, '06, 4:52:13 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
Status: offline
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The reason I put that answer is not that you didn't give me the rephrased version of the same answer, it was because so many people having the same warning. Web is full of them.
My question was how come the older version working without this warning not the new version. The program is the same for both versions. How ever one is compiled with X11R5 and other with X11R6, and I believe the program was written with the Motif 2.1 version, now I have 2.2.2. The books I have mostly for 2.1.
When I figure out I will post it. If anybody knows anything about the differences i am not aware of please let me know.
Thanks
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RE: Cannot find callback list in XtAddCallback - Jun. 8, '06, 1:51:30 PM
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cerenaksu
Posts: 49
Joined: May 3, '06,
Status: offline
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The widgets in my program are: TextFieldWidget, PushButtonWidget, ToggleButtonGadget, ListWidget. These widgets defined in the following classes and their callback list.
xmScaleWidgetClass: 1-XmNdragCallback,
2-XmNvalueChangedCallback
xmTextFieldWidgetClass: 1-XmNactivateCallback
2-XmNloosingFocusCallback
3-XmNmodifyVerifyCallback
4-XmNvalueChangedCallback
xmPushButtonWidgetClass: 1-XmNactivateCallback
xmToggleButtonGadgetClass: 1-XmNvalueChangedCallback
xmListWidgetClass :1-XmNBrowseSelectionCallback
2-XmNdefaultActionCallback
3-XmMultipleSelectionCallback
xmScaleWidgetClass: 1-XmNdragCallback
2-XmNvalueChangedCallback
All the widgets have appropriate callbacks associated with them.
Now back to my problem: Why am I having the error: “Cannot find callback list in XtAddCallback”. This proves that there is something not right with X11R6, not with the program.
> Either the callback_name is correct, but the wrong widget is specified, or the
> right widget is specified but the callback_name doesn't exist. It's more likely
> the latter.
Either one of these is not true. all the widgets is specifies with the right callbacks.
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