I'm attempting to use Qt Creator to develop on Unreal Engine 4 in Linux. I've run into an issue with the debugger: I'm unable to get Qt Creator to use GDB's pretty printers.
Epic has written pretty printers for their custom containers (like their string class) and these work great in GDB. From Qt Creator's Debugger Log, I can see that GDB is registering these printers. In fact, I can even enter a "print " command and the output is formatted nicely. However, entering the variable as an expression in the watch window, all I see is the memory address the FString points at.
Specifically, here is the debugger command issued and the resulting output when I add the FString variable "Filename" to the watch window:
Command:
140python theDumper.fetchVariables({"autoderef":1,"context":"","displaystringlimit":"100","dyntype":1,"expanded":["local","watch","inspect","local.Filename.Data","local.Filename","return"],"fancy":1,"formats":{},"nativemixed":0,"partialvar":"watch.0","passexceptions":0,"qobjectnames":0,"resultvarname":"","stringcutoff":"10000","token":140,"typeformats":{},"watchers":[{"exp":"46696c656e616d65","iname":"watch.0"}]})
<Rebuild Watchmodel 16 # 09:05:19.576 [54836ms] >
Output:
dADJUSTING CHILD EXPECTATION FOR local.Filename
dADJUSTING CHILD EXPECTATION FOR local.Filename.Data
<140python theDumper.fetchVariables({"autoderef":1,"context":"","displaystringlimit":"100","dyntype":1,"expanded":["local","watch","inspect","local.Filename.Data","local.Filename","return"],"fancy":1,"formats":{},"nativemixed":0,"partialvar":"watch.0","passexceptions":0,"qobjectnames":0,"resultvarname":"","stringcutoff":"10000","token":140,"typeformats":{},"watchers":[{"exp":"46696c656e616d65","iname":"watch.0"}]})
>&"python theDumper.fetchVariables({\"autoderef\":1,\"context\":\"\",\"displaystringlimit\":\"100\",\"dyntype\":1,\"expanded\":[\"local\",\"watch\",\"inspect\",\"local.Filename.Data\",\"local.Filename\",\"return\"],\"fancy\":1,\"formats\":{},\"nativemixed\":0,\"partialvar\":\"watch.0\",\"passexceptions\":0,\"qobjectnames\":0,\"resultvarname\":\"\",\"stringcutoff\":\"10000\",\"token\":140,\"typeformats\":{},\"watchers\":[{\"exp\":\"46696c656e616d65\",\"iname\":\"watch.0\"}]})\n"
>~"data=[{iname=\"watch.0\",name=\"0\",numchild=\"0\",valueencoded=\"notaccessible\",value=\"\",},{iname=\"watch.0\",wname=\"46696c656e616d65\",numchild=\"1\",type=\"FString &\",value=\"\",address=\"0x7fffffff76b8\",},],typeinfo=[],partial=\"1\"\n"
>~"\"[{'d_d_ptr': 3, 'cannotBeQObject': 3}, [['locals', 117], ['watches', 837842], ['safePrint', 54]]]\"\n"
>140^done
<Rebuild Watchmodel 16 # 09:05:19.576 [54836ms] >
sFinished retrieving data
(Not sure if the "ADJUSTING CHILD EXPECTATION FOR" lines were for the previous command or this one)
Toggling the "Load system GDB pretty printers" option doesn't seem to have any effect.
Searching the web hasn't yielded much for me so far. Any help would be greatly appreciated!
Edit: oh this is interesting. I did a diff of the output with pretty printing disabled vs enabled. With it enabled, I get:
<23importPlainDumpers on
sStopped at breakpoint 1 (1) in thread 1.
<24-thread-info
>&"importPlainDumpers on\n"
>&"Python Exception <type 'exceptions.AttributeError'> 'function' object has no attribute 'subprinters': \n"
>&"Error occurred in Python command: 'function' object has no attribute 'subprinters'\n"
>23^error,msg="Error occurred in Python command: 'function' object has no attribute 'subprinters'"
Edit 2: Looking into it more, it appears Qt Creator may not support pretty printers that involve using lookup functions. Is this the case?
Okay. It appears Qt Creator expects pretty printers to conform to the structure defined by the PrettyPrinter and SubPrettyPrinter objects, and enforced by the register_pretty_printer() function, defined in gdb's printing.py script and documented here: https://sourceware.org/gdb/onlinedocs/gdb/gdb_002eprinting.html
Unreal's printers do not do this.
However, even if they did, it appears Qt Creator's import code will only import subprinters, not parent pretty printers (refer to importPlainDumpers() in gdbbridge.py). It seems the best way to solve this is to update Unreal's printers to follow the examples I can find of using a function to build 'RegexpCollectionPrettyPrinter's.
Related
My setup is: ROS melodic, Ubuntu: 18.04
I want simulate turtlebot3 moving with my own global planner and have been following this tutorial to get started: http://wiki.ros.org/navigation/Tutorials/Writing%20A%20Global%20Path%20Planner%20As%20Plugin%20in%20ROS#Running_the_Plugin_on_the_Turtlebot. The tutorial seem to be made for ROS hydro, but as it was the best source of guidance I could find I hoped it would work.
The error I'm having is:
Failed to create the global_planner/GlobalPlanner planner, are you sure it is properly registered and that the containing library is built? Exception: MultiLibraryClassLoader: Could not create object of class type global_planner::GlobalPlanner as no factory exists for it. Make sure that the library exists and was explicitly loaded through MultiLibraryClassLoader::loadLibrary()
To my knowledge I've followed the tutorial as much as possible with a only a few things done differently because I wanted to test it, couldn't do as the tutorial asked, or because I thought it wouldn't impact the results. What I have done differently is:
I use the carrot_planner.h and carrot_planner.cpp files in the tutorial section 1 to test that it works before trying with my own code to avoid confusion about where possible errors come from. It's not 'different' from the tutorial to my knowledge, but figured I'd mention it. They are placed in catkin_ws/src/carrot_planner/src/global_planner/
The ros package I'm working from is in catkin_ws/src and is called the carrot_planner. In the tutorial step 1.3 I use add_library(global_planner_lib src/global_planner/carrot_planner.cpp). Would not imagine it affects the results either.
In section 3 of the tutorial it mentions that 'First, you need to copy the package that contains your global planner (in our case global_planner) into the catkin workspace of your Turtlebot (e.g. catkin_ws).' Since my package was already in catkin_ws/src/ I haven't moved it since I guess I didn't need to.
I've altered the 'move_base.launch' file in '/opt/ros/melodic/share/turtlebot3_navigation/launch/' instead of the 'move_base.launch.xml' in '/opt/ros/hydro/share/turtlebot_navigation/launch/includes/' as there doesn't seem to be a destination '...turtlebot3_navigation/launch/includes/'. There are files in launch, but no includes folder. Maybe that a difference from Hydro to Melodic, I don't know. There may be a whole lot of things that need to be done differently from the tutorial when using Melodic, or with turtlebot3, but I don't know.
I haven't made my own launch file for bringup of the turtlebot, but have instead followed this tutorial (https://emanual.robotis.com/docs/en/platform/turtlebot3/nav_simulation/) to guide me with turtlebot3. After finishing this step in the global planner tutorial 'Save and close the move_base.launch.xml. Note that the name of the planner is global_planner/GlobalPlanner the same specified in global_planner_plugin.xml. Now, you are ready to use your new planner' I tested whether it worked by running: 'roslaunch turtlebot3_gazebo turtlebot3_world.launch' and then I tried running: 'roslaunch turtlebot3_navigation turtlebot3_navigation.launch map_file:=$HOME/map.yaml' which led to the error I showed above. I have created the map-yaml, so there's no misunderstanding whether that's missing.
I would be very glad for any help, thank you ^^
Edit: My system only had 'navfn' on it, not 'global_planner' or 'carrot_planner', if that makes a difference.
After looking over the code I found a solution. It doesn't make everything work perfectly yet, but seems to solve the immediate problem.
The problem was that in my 'global_planner_plugin.xml' I just used the code provided in the tutorial:
<library path="lib/libglobal_planner_lib">
<class name="global_planner/GlobalPlanner" type="global_planner::GlobalPlanner" base_class_type="nav_core::BaseGlobalPlanner">
<description>This is a global planner plugin by iroboapp project.</description>
</class>
</library>
But in the carrot_planner.cpp file it says:
PLUGINLIB_EXPORT_CLASS(carrot_planner::CarrotPlanner, nav_core::BaseGlobalPlanner)
Changing type="global_planner::GlobalPlanner to type="carrot_planner::CarrotPlanner and then launching turtlebot3 doesn't give the same error anymore.
I have used im2rec.py to convert "caltech101 images" into record io format:
I have created "caltech.lst" succesfully using
os.system('python %s/tools/im2rec.py --list=1 --recursive=1 --shuffle=1 data/caltech data/101_ObjectCategories'%MXNET_HOME)
Then, when I run this :
os.system("python %s/tools/im2rec.py --train-ratio=0.8 --test-ratio=0.2 --num-thread=4 --pass-through=1 data/caltech data/101_ObjectCategories"%MXNET_HOME)
I have this error : attributeError:'module' object has no attribute 'MXIndexedRecordIO'
Please, someone has an idea to fix this error ?
Thanks in advance.
Environment info
Operating System:Windows 8.1
MXNet version:0.9.5
If I have found the right version of im2rec.py then the program is failing at one of the two calls that look like this:
record = mx.recordio.MXIndexedRecordIO(...)
That looks very much as if the code you are running is expecting a different version of mxnet from the one you have installed. The message is telling you that there isn't a class/function called MXIndexedRecordIO in module mxnet.recordio.
#user3824903 I think to create a bin directory, you have to compile MXNet from source with option USE_OPENCV=1
I have read this blogpost http://www.ics.com/blog/qt-tips-and-tricks-part-1 and tried to enable plugin debugging as described.
I've put this line in my main.cpp:
qputenv(QT_DEBUG_PLUGINS, 1);
But if I try to compile I'm getting this error:
.../src/main.cpp:14: error: 'QT_DEBUG_PLUGINS' was not declared in this scope
qputenv(QT_DEBUG_PLUGINS, -1);
What is the problem here and how do I have to do it right?
qputenv("QT_DEBUG_PLUGINS", QByteArray("1"));
But I don't get any additional output.
I'm using Qt5.5.1 with QtCreator 3.6 under KUbuntu 15.10.
You're supposed to set env variable from outside your program, not from inside! It's very likely the plugin loading you're interested into already happened by the time you reach that line. Try putting it before creating a Q*Application object.
– peppe
That's it. It was definitely set before plugin loading, but it seems to be important to set it before creating Q*Application as you wrote. Thank you.
– avb
I'd like to either disable the VTK warning window or, better yet, catch them to handle with my application's logging system. My application is using an embedded mayavi view, and I don't want error windows popping up that I have no control over. The following code demonstrates the warning window.
import numpy as np
from mayavi import mlab
x1 = np.array([1, 1, 2, 3])
y1 = np.array([1, 1, 4, 2])
z1 = np.array([1, 1, 5, 1])
mlab.plot3d(x1, y1, z1)
mlab.show()
Ok, I've done some research and discovered that vtk.vtkObject.GlobalWarningDisplayOff() will disable the window completely, which is nice. Better yet the followingcode will log the warnings to a file (found it here):
def redirect_vtk_messages ():
""" Can be used to redirect VTK related error messages to a
file."""
import tempfile
tempfile.template = 'vtk-err'
f = tempfile.mktemp('.log')
log = vtkpython.vtkFileOutputWindow()
log.SetFlush(1)
log.SetFileName(f)
log.SetInstance(log)
So while this is nice, I'm still unable to pipe the warnings directly into a logging handler. I'd rather not have to have a vtk_log file next to my regular log files. Also I might want to handle the warnings in my GUI somehow, or give the user options on how to handle them and constantly watching a log file for changes seems like a poor way to do that.
Any suggestions on a robust pythonic way to handle vtk warnings in an application which embeds mayavi/vtk?
I don't know whether this will work in the Mayavi environment, but this works for Python wrappings to VTK
# pipe vtk output errors to file
errOut = vtk.vtkFileOutputWindow()
errOut.SetFileName("VTK Error Out.txt")
vtkStdErrOut = vtk.vtkOutputWindow()
vtkStdErrOut.SetInstance(errOut)
I guess this partially answer your question, but you could implement an error observer in python as explained here http://public.kitware.com/pipermail/vtkusers/2012-June/074703.html and add it to the vtk class you are interested.
In c++ I find much simpler to redirect the output to stderr (this example is for windows):
vtkSmartPointer<vtkWin32OutputWindow> myOutputWindow = vtkSmartPointer<vtkWin32OutputWindow>::New();
myOutputWindow->SetSendToStdErr(true);
vtkOutputWindow::SetInstance(myOutputWindow);
In python I tried
ow = vtk.vtkOutputWindow()
ow.SendToStdErrOn()
it sends the error to console, but I still see the vtk window and it doesn't really seem catching the errors.
Another option could be to recompile vtk with VTK_USE_DISPLAY turned off ( http://osdir.com/ml/python-enthought-devel/2009-11/msg00164.html). I am not going to try this because I am using the vtk distribution already compiled in paraview
You can create a subclass deriving from vtkOutputWindow and implement your message handling in the method void DisplayText(const char* someText). I did this is in a C++ project to redirect all output to cerr and even suppress specific warnings.
An approach I found similar to #SciCompLover's answer that suppresses the output window while also printing to the console:
import vtk
vtk_out = vtk.vtkOutputWindow()
vtk_out.SetInstance(vtk_out)
Tested on Mayavi 4.7.1 with VTK 8.2.0 on Windows and MacOS.
I can compile the solution with no errors, but when I'll try to run it, I get a crash window:
An unhandled exception of type
'System.Resources.MissingManifestResourceException' occurred in mscorlib.dll
Additional information: Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "<myformname>.resources" was corerctly embedded or linked into assembly "<myprojectname>" at compile time, or that all the satellite assemblies required are loaded and fully signed.
And after I press Break it throws me to the line:
this->Icon = (cli::safe_cast<System::Drawing::Icon^ >(resources->GetObject(L"$this.Icon")));
If I comment this line out, everything works just fine, but my program doesn't have icon.
Anyone else had this problem? Found a solution? I couldn't find anything clear enough for me to understand, problem is really annoying me, only solution I found was to declare my form class before any other classes, but I don't even have any other classes in my solution?
I also have only one project in this solution, ms support said something about having multiple projects, which I don't have, so it was no use either.
Take a look here :
http://www.mztools.com/articles/2005/MZ2005007.aspx
The exception is thrown because your icon cannot be located. You will probably need to compiles your resources under one .dll and put this under en-US subfolder on your project output. It did the trick for me at least. There are probably other solutions to your problem too.
Do not panic like I did. The root cause of the problem is that the compiled resource file is different from the one that is asked to load at runtime. This happens because the underlying build-script cannot detect the filename or namespace changes made after the form is created.
For example, At first we started a project named x . And our $(RootNamespace) becomes x. And we created a form named y. So our XML resource file y.resx gets compiled into x.y.resource . At this point the icon change works.
Now somehow we changed the project name or the namespace to z. But our $(RootNamespace) remains the x. While at compile-time it wrongly generates old x.y.resource, but at links-time it links z.y.resource. And at this point the icon change does not work.
It can also happen if the form is under some nested namespace which is not known in the project file.
It can be fixed by changing the compilation output of the y.resx file . It can be done by right-clicking the resource and changing the Resource Logical Name to $(RootNamespace).%(Filename).resources .
I will also make sure that ProjectName,AssemblyName and RootNamespace are the same in the .vcxproj file. Somehow if the form is declared under a nested namespace like RootNamespace.gui , then the output file of the resource should be $(RootNamespace).gui.%(Filename).resources .