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#946 ERROR on DISPLAY STATEMENT
not-our-bug
5 - default
2024-06-15
2024-02-10
No
The following example program requires typing two fields on the screen, a name and a code.
If nothing is typed then it displays an error message requiring you to type the single field.
See screenshot.
To view the bug, proceed as follows.
a. When the program asks you to type the name, do not type anything but just press Enter see ERR10.PNG
b. The system displays the error message (using some DISPLAYS) see ERR20.PNG
c. Press Enter again to exit from the message
d. The system prompts you to enter the Name field again
e. do not type anything but just press Enter again
f. The program should display the same error message again.
g. The program executes the same DISPLAY statements again but this time the message is not displayed on the screen.
How come ?
>>SOURCE FORMAT IS FREE
REPLACE ==:BCOL:== BY ==with BACKGROUND-COLOR==
==:FCOL:== BY ==FOREGROUND-COLOR==.
IDENTIFICATION DIVISION.
program-id. TESTERROR.
ENVIRONMENT DIVISION.
Configuration Section.
SPECIAL-NAMES.
CRT STATUS IS wKeyPressed.
DATA DIVISION.
*> **************************************************************
WORKING-STORAGE SECTION.
*> **************************************************************
01 Black constant as 00.
01 Blue constant as 01.
01 Green constant as 02.
01 Cyan constant as 03.
01 Red constant as 04.
01 Magenta constant as 05.
01 Orange constant as 06.
01 Brown constant as 06. *> same color code as yellow
01 LightGrey constant as 07. *> Light Gray
01 Grey constant as 08. *> Dark Gray
01 LightBlack constant as 08. *> same color code as Grey
01 LightBlue constant as 09.
01 LightGreen constant as 10.
01 LightCyan constant as 11.
01 LightRed constant as 12.
01 LightMagenta constant as 13.
01 Pink constant as 13.
01 Yellow constant as 14.
01 White constant as 15. *> white
01 AnageRec value space.
03 AnageCodAge pic x(10) value space. *> code AGENT
03 AnageRagSoc pic x(30) value space. *> NAME
*> Values that may be returned in CRT STATUS (or COB-CRT-STATUS)
78 K-ENTER VALUE 0000.
78 K-UP VALUE 2003.
78 K-DOWN VALUE 2004.
78 K-LEFT VALUE 2009.
78 K-RIGHT VALUE 2010.
78 K-ESCAPE VALUE 2005.
78 K-TAB VALUE 2007.
78 K-BACKTAB VALUE 2008.
78 K-PAGEUP VALUE 2001.
78 K-PAGEDOWN VALUE 2002.
01 wKeyPressed PIC 9(04) VALUE 9999.
77 NumFields pic 9(02) value 2. *> number of fields on screen
01 wBox-bco pic 9(02) value cyan.
01 wBox-fco pic 9(02) value black.
01 wRetCode PIC 9999 value zero.
01 wFunc-NumVal PIC 9999 value zero.
77 Pivot pic 9(02) value 01.
77 dbc pic 9(04) value green. *> display backgr.color
77 dfc pic 9(04) value white. *> display foregr.color
77 abc pic 9(04) value 00. *> accept backgr.color
77 afc pic 9(04) value 15. *> accept backgr.color
77 Pro pic x(01) value '_'.
77 wHeader pic x(80) value space.
01 wString pic x(31) value space.
01 ER pic x.
88 NoErrors value 'N'.
88 Errors value 'Y'.
01 wCursorShow BINARY-SHORT SIGNED value 2.
01 wCursorHide BINARY-SHORT SIGNED value 0.
*> SAVE/RESTORE SCREEN VARIABLES
01 wScreenName PIC X(256) value space.
01 wiScrOk BINARY-LONG value zero.
01 Btabmess.
03 Bmess pic x(30) occurs 20 value space.
*> **************************************************************
*> P R O C E D U R E D I V I S I O N
*> **************************************************************
PROCEDURE DIVISION.
set environment 'COB_SCREEN_EXCEPTIONS' TO 'Y'.
set environment 'COB_SCREEN_ESC' TO 'Y'.
set environment 'COB_LEGACY' TO '1'
*> ************************************************************************************
*> D I S P L A Y S C R E E N
*> ************************************************************************************
string ' SAMPLE TEST APPLICATION ' delimited by size into wHeader
display wHeader at 0101 with Background-Color green Foreground-Color white highlight
display ' ESC-<Exit> '
at 2501 with Background-Color green Foreground-Color white
display ' Name ..................:' at 0501 with Background-Color dbc Foreground-Color dfc
display AnageRagSoc at 0527 with Background-Color abc Foreground-Color afc
display ' Code..:' at 0561 with Background-Color dbc Foreground-Color dfc
display AnageCodAge at 0570 with Background-Color abc Foreground-Color afc
continue.
LOOP-ACCEPT.
*> re-show the cursor
call static 'curs_set' using by value wCursorShow end-call
go to acc01 acc02 depending on Pivot.
ACC01.
*> NAME
accept AnageRagSoc at 0527 with Background-Color abc Foreground-Color afc
update prompt character is pro auto-skip reverse-video
go EVALUATE-KEY.
ACC02.
*> CODE
accept AnageCodAge at 0570 with Background-Color abc Foreground-Color afc
update prompt character is pro auto-skip reverse-video
go EVALUATE-KEY.
EVALUATE-KEY.
EVALUATE wKeyPressed
*> ******************************************************************
*> ENTER = CONTROLS ON SCREEN FIELDS
*> ******************************************************************
WHEN K-ENTER
WHEN K-TAB
WHEN K-DOWN
perform CtrFields thru CtrFieldsEx
if Errors
continue
else
*> go to next field on screen
compute Pivot = Pivot + 1
if Pivot > NumFields move 1 to Pivot end-if
end-if
WHEN K-BACKTAB
WHEN K-UP
perform CtrFields thru CtrFieldsEx
if Errors
continue
else
*> go to previous field on screen
compute Pivot = Pivot - 1
*> with following statement, when cursors is on 1st field
*> it remains there (non to go - wrap - on last filed)
if Pivot < 1 move 1 to Pivot end-if
end-if
*> ******************************************************************
*> ESCAPE = EXIT
*> ******************************************************************
when K-ESCAPE
go to END-OF-PROGRAM
END-EVALUATE
GO LOOP-ACCEPT.
*> *****************************************************************************
*> E N D O F P R O G R A M
*> *****************************************************************************
END-OF-PROGRAM.
Goback.
*> *****************************************************************************
*> C H E C K F I E L D S C O N T E N T
*> *****************************************************************************
CtrFields.
set NoErrors to true
go to ctr01 ctr02 depending on Pivot.
CTR01.
if AnageRagSoc = space
set Errors to true
move lightgreen to wbox-bco move white to wbox-fco
move '111111111111111111111111111111' to Bmess(1)
move ' >>> ERROR 1 <<< ' to Bmess(2)
move '111111111111111111111111111111' to Bmess(3)
move ' Please Type a NAME ' to Bmess(4)
move '111111111111111111111111111111' to Bmess(5)
move '111111111111111111111111111111' to Bmess(6)
move '---- enter to return ---------' to Bmess(7)
perform DisplayErrorMessage thru DisplayErrorMessageEx
end-if
go CtrFieldsEx.
CTR02.
if AnageCodAge = space
set Errors to true
move lightred to wbox-bco move yellow to wbox-fco
move '+----------------------------+' to Bmess(1)
move '| >>> ERROR 2 <<< |' to Bmess(2)
move '|2222222222222222222222222222|' to Bmess(3)
move '| Type a CODE !!! |' to Bmess(4)
move '|2222222222222222222222222222|' to Bmess(5)
move '|2222222222222222222222222222|' to Bmess(6)
move '+- Enter to return ----------+' to Bmess(7)
perform DisplayErrorMessage thru DisplayErrorMessageEx
end-if
go CtrFieldsEx.
CtrFieldsEx. exit.
DisplayErrorMessage.
move Z'DUMPSCREEN.TMP' to wScreenName
call static 'scr_dump' using by reference wScreenName returning wiScrOk end-call.
display Bmess(1) at line 04 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(2) at line 05 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(3) at line 06 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(4) at line 07 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(5) at line 08 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(6) at line 09 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
display Bmess(7) at line 10 col 10 :BCOL: wbox-bco :FCOL: wbox-fco
accept omitted
call static 'scr_restore' using by reference wScreenName returning wiScrOk end-call
call static 'refresh' returning wiScrOk end-call
*> CALL 'CBL_DELETE_FILE' USING wScreenName
continue.
DisplayErrorMessageEx. exit.
Normally Chuck builds three different versions of pdcurses.dll with the following names:
pdcurses-vt.dll
pdcurses-wincon.dll
pdcurses-wingui.dll
And the "pdcurses-wincon.dll" is copied to "pdcurses.dll".
The wincon version of pdcurses.dll should work correctly in either the CMD.EXE shell or the Windows Terminal shell for cmd.exe. Wingui uses a separate graphic window.
The semigraphic characters should display as expected when using wincon or wingui versions of pdcurses.dll. I'm not sure what the issue with VT terminal support is, but it could be related to character set code-pages, or in attempting to emulate 7-bit ASCII terminals.
I'm not sure how the OpenCobolIDE "pyqde-console.exe" shell handles terminal display, but I suspect it is different from pdcurses wincon or wingui terminal emulation.
Last edit: Arnold Trembley 2024-06-15
Many thanks for the clarifications.
Can you o someone else tell what the differences are between
pdcurses.dll
pdcurses-vt.dll
pdcurses-wincon.dll
pdcurses-wingui.dll
and why do these versions exist ?
PDCursesMod can be built to support 3 different terminal types on windows. In my opinion wincon is the most useful, and TUI-Tools should work best with wincon. But you cannot do GUI style things in wincon (cmd.exe and Windows Terminal/cmd.exe), so Chuck Haatvedt is interested in building GUI style interfaces and likes wingui. VT terminal emulation is probably more similar to traditional unix or linux environments.
The three different versions exist so that GnuCOBOL users can switch their pdcurses.dll file to use different terminal emulation on Windows, without recompiling their COBOL programs. "pdcurses.dll" is part of the GnuCOBOL runtime environment.
Simon or Chuck may be able to give a better explanation than I can. I normally use the wincon version of pdcurses.dll.
concerning the PDCurses ports (there are also more, but the others have
additional dependencies) see
https://github.com/Bill-Gray/PDCursesMod/?tab=readme-ov-file#ports and
then the referenced readme file for the ports
second question.
Chuck's version does not display semigraphic characters correctly. Lines, angles, T ...
See screenshot
Can you say why?
Last edit: Eugenio Di Lorenzo 2024-06-13