chu@ames.arc.nasa.gov (Susie W. Chu) (04/21/89)
I have used the X11R3 and the Xhp which was patched with
Martin Friedmann's xhp.patch.work.tar.Z.
I have writen an application that is a display and control panel of
a set of parameters. I use the StaticText widgets (one per parameter)
as children of a RowCol widget. They display the current values of the
parameters with the background color indicating the value is above,in,
or below their range. The application have to constantly read the data
package from a remote machine over a udp socket and update the display
accordingly. This part I used XtAddInput on socket. Besides these,
each parameter panel is associated with a popup menu which the user
can set/reset the criteria associated with the parameter when the
parameter is selected by press the mouse button.
Now I have questions:
(A) on VAX750 and VaxStation 2000, all run ULRTIX 3.0 (namely the
ULTRIX 3.0 server ont the workstation:
(1) Can only run on the workstation with DISPLAY="unix:0" or
-display "unix:0". But not any other display. The application
die at XtInitialize with "X Toolkit Error: Can't Open Display".
But I have no problem on running other X11R3 clients.
(2) In the Input callback routine, everytime after I read the data
package over the udp socket, I use XtSetValues to set XtNstring and
XtNbackground. It changed the background color o.k. but not in
display the text, somehow it displayed no text and the text altenately.
Is it a bug or a feature of XtSetValues? I remembered I read from the
news talked about how XtSetValues work differently in Xhp R2 and Xhp
R3. Has it related to my problem. How can I make it work right?
(B) On sun3/60, run SunOs 4.0:
got segmentation fault and core dumped on run.
I am not sure I coded the XtAddInput and its input callback routine
right. There is no reference in the Xhp doc. and the X Toolkit Intrinsis
doc is hard to follow. If somebody can give a copy of sample or point
to me the examples in X11R3, I will appreciate very much. If someone
is willing to test my program to help me find out what wrong, I will
be more than happy to mail you a copy of my programs.
Thanks in advance.
---Susie Chu at (415)694-6003
net address: chu@ames.arc.nasa.gov
UUCP: {ihnp4,ucbvax,nike,lll-crg}!ames!chu
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