| Pixel format error [message #16604] |
Thu, 05 August 1999 00:00 |
mallors
Messages: 76
Registered: November 1997
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Hi all,
When testing a somewhat large program I wrote under
Linux on Win98, IDL generated an error I've
not seen before, and I was hoping someone might have
come across it.
The program contains many objects, pointers, and widgets.
The main display widget is coded as an object, and one of the
first things the code does is instantiate this object and
create the widget. The first line in the PRO that
builds the widget is this:
screen = GET_SCREEN_SIZE()
Under Win98, this crashes with the following error:
% Internal error. Unable to determine pixel format.
% Expression must be a structure in this context: <No name>.
% Execution halted at: GET_SCREEN_SIZE 65
C:\RSI\IDL52\lib\get_screen_size.pro
This line (65) in the file is
WIDGET_CONTROL, wBase, /REALIZE
wBase is a valid widget ID at this point.
I can't remember where I heard about GET_SCREEN_SIZE(), but
I seem to remember that it was preferred over
DEVICE, GET_SCREEN_SIZE = screen. However, now I see that
GET_SCREEN_SIZE() does not appear in the IDL help. When
I changed my code to use DEVICE, ... it works fine.
By the way, if I start IDL fresh, and type
"screen = GET_SCREEN_SIZE()", the function call succeeds. If
I then run my program, it crashes. Apparently something I do
before the call is invoking the error, but it is a large program
and I can't spare the time to track the error right now.
Has anyone ever seen this? Should we prefer DEVICE over the
library function?
Regards,
-bob mallozzi
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~
Robert S. Mallozzi 256-544-0887
Mail Code SD 50
Work: http://gammaray.msfc.nasa.gov/ Marshall Space Flight Center
Play: http://cspar.uah.edu/~mallozzir/ Huntsville, AL 35812
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~
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