On Oct 29, 2010, at 3:16 PM, Kai Habel wrote:
Am 27.10.2010 09:56, schrieb Ben Abbott:
Ben,
I don't think the error is related to the call of error (msg). Can you check
this, by commenting out this line or placing an input('press enter') before
this line.
You are correct. When I comment out this line, the crash still occurs.
I think the FLTK-GUI runs in "parallel" and is catching an mouse event.
When looking at the backtrace, I see that at #18 plot_window::handle() is called with event==1
(FL_PUSH?) and after that plot_window::pixel2axes_or_ca (this=0x19123970, px=35,py=52). This looks
like valid pixel coordinates. Can you confirm that the error happens during pixel2axes_or_ca. That
should be possible with a debugger, or you can place some debug statements in there e.g.
printf("before\n"); printf("after\n");
The crash seems to happen later in:
#14 0x001ccadd in screen_size_pixels () at graphics.cc:541
where we have
#13 0x017b67ea in Matrix::extract_n (this=0xbfff85e8, r1=0, c1=2, nr=1, nc=2)
----------graphics.cc-----------
// This function always returns the screensize in pixels
static Matrix
screen_size_pixels (void)
{
graphics_object obj = gh_manager::get_object (0);
Matrix sz = obj.get ("screensize").matrix_value ();
return convert_position (sz, obj.get ("units").string_value (), "pixels",
sz.extract_n (0, 2, 1, 2)).extract_n (0, 2, 1, 2);
}
-------------------------------------------------
It seems convert_position() is never called, because one of those
xxx.extract_n() calls fail.
Can you check there if all variables are ok there?
Kai
I'm a c++ flunky. It may be necessary for you give me the commands I need to
check the variables are ok.
I realize I should start with ...
break graphics.cc:541
... which stops at "return convert_position (...)"
Is it enough to then to ..
print sz
Which gives ..
$1 = {
<Array<double>> = {
rep = 0x2d6b7e0,
dimensions = {
rep = 0x2d7c6c8
},
slice_data = 0x4955440,
slice_len = 4
},<No data fields>},<No data fields>}
I can "continue" several times until the plot window appears with the uimenu, but then I'm unable
to select the "clf" option since I have to go back to the command line and type
"continue" again... hmm, I'm not being very clear. Hopefully you understand my problem with the
debugger.
Is the a c++ command I can insert into the code to print the contents of "sz"
to the command liine?
Ben
patch.crash