On 13/03/2010, at 9:42 AM, Gene_Gaunt@xxxxxxxxxxxxxxx wrote:
After Googling this stuff, we found this table named 'Graphic Escape
APL/TN, Code Page 310' and here is it's picture:
http://www-03.ibm.com/systems/resources/systems_i_software_globalization_pdf_cp00310z.pdf
That helps explain something I'd noticed in the 5250 data stream for
READ SCREEN (WITH EXTENDED ATTRIBUTES) and PRINT SCREEN (WITH EXTENDED
ATTRIBUTES). When PC250 builds a data stream for these commands it
uses GUI-like characters when windows, menu bars, scroll bars, etc.
are active. These are what causes the "pretty" displays of these
advanced DDS (extended 5250) features in PC5250 e.g., windows with
solid borders and drop shadow on right and bottom borders.
For PRINT SCREEN (WITH EXTENDED ATTRIBUTES) the client is supposed to
replace these GUI-like characters with their character equivalents. In
some versions of PC5250 this is not done (e.g., V5.7) although I note
the DBCS version (at the same release) does do it properly.
Given that the chart for CP 310 shows only those characters above
x'40' and that the GUI-like characters used by PC5250 are all below
x'40' I cannot be certain but my guess is that PC5250 uses CP 310 for
drawing GUI-like constructs and therefore once it has switched into
that mode any characters it encounters, such as those in the
transparent data, are treated as CP 310 values until it switches out
at the end of a given GUI construct.
As a test I modified your horizontal scroll bar program to generate a
window and then put transparent data over the top and bottom borders
and lo did I see the same APL characters.
I noted previously that the APL characters disappear and normal
characters are displayed when another window overlays this screen. I'm
not sure why the APL characters are not reinstated after the window is
closed and the system redraws the underlying screen. Also printing the
APL screen results in normal characters being printed and no evidence
of scroll-bars. Compare this with printing the screen when it contains
only the horizontal scroll-bars.
I've not found any documentation for the GUI-like characters so for
anyone who cares the list (so far) is:
Horizontal scroll bar:
03 left-arrow
1B scroll-bar shaft
1D scroll-bar slider
(as many 1B and 1D characters as necessary are used to complete the
scroll bar)
05 right-arrow
Vertical scroll bar:
01 up-arrow
1A scroll-bar shaft
19 scroll-bar slider
(as many 1A and 19 characters as necessary are used to complete the
scroll bar)
02 down-arrow
Window:
0C top-left corner
13 top border
0B top-right corner
12 left border
10 right border
0A bottom-left corner
11 bottom border
0D bottom-right corner
Drop-down Menu:
08 top-left and top-right corners
12 left border
10 right-border
11 bottom border
There are probably others I've not yet discovered such as the menu bar
separator, check boxes, radio buttons, push buttons etc.
Insane?
Perhaps not ... perhaps just slightly mad but then we all must be to
some degree else we wouldn't bother trying to puzzle this stuff out.
We'd be drinking beer and watching sports.
Regards,
Simon Coulter.
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