cvMat for LLDB

This is a script for lldb to debug OpenCV programs. You can print a Mat or just call imshow or imwrite in lldb just like you are dealing with OpenCV functions.

What do you expect from this Plugin

This script provide 3 commands for lldb debugger.

• printMat : print an OpenCV Mat
• imwrite : write an OpenCV Mat to image
• imshow : show an OpenCV image

You can print a OpenCV Mat, or display the mat as picture, or save the mat as image in lldb debugger.

How to use it

Python Dependency

First you have to install opencv for python.

Note that this script is fully based on the Python API of LLDB. Such API support only the native Python on the OSX. Make sure you can run import cv2 in your system python.

Setup LLDB

• Run command as below each time you launch lldb
• Or add a line in ~/.lldbinit and restart lldb

# you should fix the path by yourself
command script import "/path/to/cvmat.py"

call printMat or imshow or imwrite

Let's take printMat as an example. In lldb if you run

printMat arr

You will get

flags: 1124024333
type: CV_32F
channels: 2
rows: 5, cols: 5
line step: 40
data address: 0x1029097e0
[[[  0.   1.]
  [  0.   1.]
  [  0.   1.]
  [  0.   1.]
  [  0.   1.]]]

Thanks To

• https://github.com/carlodalmutto/ImageWatchLLDB

Author

Name : Hou Qi