comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: Re: Widget Flakiness

Re: Widget Flakiness
type: item
description: Matthew J. Sheats wrote: > > The following problem occurs in NT 4.0 under IDL 5.0.0. I haven't > tried the program on other platforms. I have a program which repeatedly > updates a LABEL widget on a base widget several thousand times. It > basically just writes out pixels which it has processed. > > Also there is a make-shift percentage status bar which gets updated > regularly. After the display has been updated about ( don't laugh ) > 14,232 times, the widget locks up.. nothing more gets displayed. > > The percentage bar's "bar" disappears much earlier.. but the text > display in the draw widget continues to update for the entire life of > the widget. > > All operations continue to take place behind the scenes and the run > actually does go to completion. When the run completes, the entire > screen corrupts. Windows flash around and makes things generally > un-usable. In some cases I can use the task bar to close the run away > widget and recover, however in most cases I have to reboot. > > Has anyone ever experienced this kind of thing before? > > Thanks, Matthew Sheats The only similar difficulty I had turned out to be the result of using DEVICE, set_graphics=6 (xor drawing mode). This mode, when used in widgets, has the ability to "leak" out of the code area you expect it to reside in, since widget events don't have a guaranteed ordering. This could also be the case in a complicated non-widget code. The color corruption could be affecting your text and status bar colors too. Anyway, it's a possibility. JD
creator: J.D. Smith
date: 1997-09-25T07:00:00-00:00