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| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
|
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
2287.0. "Crash after marking a character" by FRSTSC::ERLEMANN (Bedman strikes back) Fri Feb 16 1990 09:51
Hi,
a customer of mine has problems with programming DECwindows in C/UIL.
He has these problems in an individual programmed application, but
he can explain his problems in conjunction with the DECburger program
in DECW$EXAMPLES.
I'll translate his problem-description as follows:
*"At the beginning of a 'simple text widget' there's a 13-places/digits long
* string. If I mark the 6th character reverse video through MB1 and after
* this let the program run through a 'DwtSTextReplace' statement, which
* accesses the 'simple text' widget, the program crashes with an error:
* 'OPCODE reserved by DIGITAL'.
*
* Program technical explanation:
* You create a 'simple_text' widget. You can also use the 'simple_text'
* widget ("fries_quantity") from the DECburger example. Therefore you
* have to enlarge it and predefine it with the 13-digits string. These
* parameters are defined in the argument section of the "fries_quantity"
* object in DECBURGER.UIL. Now you have to code the "DwtSTextReplace"
* statement in DECBURGER.C, which causes the crash of the program. This
* statement simply replaces the whole 13-digit string in the "fries_-
* quantity" widget with the NUL-character.
*
* DwtSTextReplace(widget_array[w_fries_quantity],0,13,"");
*
* I have implemented this statement in the "list_proc" routine from
* DECBURGER.C to create a controllable run of the statement. (Crash after
* marking the 6th character in the "fries_quantity" widget and afterwards
* selection of a drink in the "drink_list_box")
*
* Furtheras I have not undertaken any systematical tests. (e.g. changes
* of the stringlength or marking of other/multiple characters"
The system crashes with the following messages:
%SYSTEM-F-OPCDEC, opcode reserved to DIGITAL fault at PC=0008CA02, PSL=03C00000
%TRACE-F-TRACEBACK, symbolic stack dump follows
module name routine name line rel PC abs PC
0008CA02 0008CA02
000FBF66 000FBF66
000FD17A 000FD17A
000FB86F 000FB86F
000ECF0D 000ECF0D
DECBURGER list_proc 8236 00000033 00000EA7
000FAEF1 000FAEF1
000FAF99 000FAF99
000DDD29 000DDD29
000DE02F 000DE02F
000FAEF1 000FAEF1
000FAF99 000FAF99
000E13F6 000E13F6
000FAEF1 000FAEF1
000FAF99 000FAF99
000DB7DF 000DB7DF
000DBB20 000DBB20
0010C4E2 0010C4E2
0010EB13 0010EB13
0010EDC2 0010EDC2
0010EDF8 0010EDF8
0010F0D7 0010F0D7
0010F0B8 0010F0B8
DECBURGER main 7860 000000C6 000008C6
Just in this moment the customer phoned me again an explained me a more
comfortable way to see his effects.
He's of the opinion that this behavior occurs every time when the NOTEPAD-
Editor is involved in the story.
You can see it with the following steps:
***CAUTION*** you have to start DECwindows again after this.
1. Log out from DECwindows
2. Type in a string in the username-field
3. Mark one character of the string reverse video with the mouse
4. Type <CTRL/U> and see what happens.
Thanx for your attention
<>Armin<>
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