#8173 seems to have fixed everything, including a crash when I enable
dbus signalling, which I haven't brought up yet. Now I have to figure
out how to install 8173 to all my PCs
Some advice please. Currently, I have many calls like
DBus["system://org.freedesktop.UDisks2"]["/org/freedesktop/UDisks2/block_devices/sda1",
"org.freedesktop.UDisks2.Filesystem"].MountPoints. (status quo)
I can replace it with new approach 1:
Private $DBusApp As DBusApplication = New DBusApplication(MyDBus.System,
$Application)
mnt=$DBusApp["/org/freedesktop/UDisks2/block_devices/sda1",
"org.freedesktop.UDisks2.Filesystem"].MountPoints
or even new approach 2:
Private Proxy as DBusProxy
Proxy = $DBusApp["/org/freedesktop/UDisks2/block_devices/sda1",
"org.freedesktop.UDisks2.Filesystem"]
mnt=Proxy.Mountpoints
What would be your preferred approach? I know that the DBus class caches
DBus Applications so that there doesn't seem to be any resource
advantages to new approach 1. New approach 2 will require 2 proxies for
each drive, one for the Filesystem interface and one for the Block
interface.
On 2017-08-07 09:52 AM, Benoît Minisini wrote:
Le 07/08/2017 à 15:02, Adrien Prokopowicz a écrit :
Le Sun, 06 Aug 2017 17:56:27 +0200, Tony Morehen
<tmore...@ajmconsulting.ca> a écrit:
Hello all,
Damn, my program crashed Gambas this way :
1) Run the program
2) Plug in a usb drive
3) Click the mount button, mounts OK
4) Click the unmount button
Program crashes Aborted(6)
Console shows realloc error invalid old size
Background:
I'm writing a Udisks2 module that communicates with UDisks2 over dbus.
It gathers drive info on existing drives and receives notifications
when
a new drive is plugged in, usb stick etc.
Two problems:
1) The crash above. Note that unmount works if the usb drive is
already
plugged in. Careful: the program defaults to unmounting /dev/sdb1.
Make sure you use the right drive id.
2) The program intially sends some basic drive info to debug output.
First, it prints the info item by item with no problems. Then it tries
to print the same items in one print statement. Some of the output is
garbage. What's worst, I've tried saving each info item to separate
variables. If I step through the assignments one item at a time, the
individual assignment is at first correct. However, after the next item
is assigned, the previous item's value also changes. This looks like a
buffer overrun or a stack overflow.
After a bit of searching, I found that the offending code can be
reduced to
this single line :
Print
DBus["system://org.freedesktop.UDisks2"]["/org/freedesktop/UDisks2/block_devices/sda1",
"org.freedesktop.UDisks2.Filesystem"].MountPoints
It appears this property gets translated to a Byte[][], but the
interpreter crashes
when trying to create one from the native components, because the
class's symbol table
is not initialized yet (as object classes are created dynamically).
However, creating one from Gambas code works, and in fact, creating
one before
the D-Bus call makes it not crash anymore :
Dim x As New Byte[][]
Print
DBus["system://org.freedesktop.UDisks2"]["/org/freedesktop/UDisks2/block_devices/sda1",
"org.freedesktop.UDisks2.Filesystem"].MountPoints 'works!
Now you have a workaround, for until this is actually fixed. :)
Regards,
Is it better with revision #8173?
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