当遇到断点时,我成功运行了一个python脚本。正如here所解释的,我创建了一个python模块,用这个签名实现我的函数:
breakpoint_function (frame, bp_loc, dict)
然后我通过执行以下操作将模块带入lldb:
(lldb) command script import "path to my .py file"
然后我创建一个断点并将我的函数添加到它中:
(lldb) br com a -F MyModule.breakpoint_function
我的模块看起来像这样
import matplotlib.pyplot as plt
import numpy as np
def bp(frame, bp_loc, dict):
a = frame.FindVariable ("myFloatArray")
for i in range(128):
x[i]= float(a.GetChildAtIndex(i,1,1).GetValue())
# plt.ion()
# plt.show()
plt.plot(x)
plt.show()
#plt.pause(10.001)
return 0
仅使用plt.plot(x)和plt.show()会导致lldbdb崩溃,错误日志的开头如下所示:
2016-12-22 21:26:51.192 lldb [32192:2025199] *** + [NSUndoManager _endTopLevelGroupings]中的断言失败,/ Library / Cache / com.apple.xbs / Sources / Foundation / Foundation1256.1 / Misc.subproj / NSUndoManager.m:359 2016-12-22 21:26:51.192 lldb [32192:2025199] + [NSUndoManager(NSInternal)_endTopLevelGroupings]只能在主线程上调用。 2016-12-22 21:26:51.272 lldb [32192:2025199]( 0 CoreFoundation 0x00007fff8da54ae2 __exceptionPreprocess + 178 1 libobjc.A.dylib 0x00007fff90f7173c objc_exception_throw + 48 2 CoreFoundation 0x00007fff8da548ba + [NSException raise:format:arguments:] + 106 3基础0x00007fff9145c88c - [NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198 4基础0x00007fff913e24c1 + [NSUndoManager(NSPrivate)_endTopLevelGroupings] + 170 5 AppKit 0x00007fff9bfd306a - [NSApplication run] + 844 6 _macosx.so 0x00000001256c931e init_macosx + 32153 7 Python 0x000000010e75aa90 PyEval_EvalFrameEx + 13533 8 Python 0x000000010e7573c1 PyEval_EvalCodeEx + 1583 9 Python 0x000000010e75d4ae _PyEval_SliceIndex + 342 10 Python 0x000000010e75a30c PyEval_EvalFrameEx + 11609
当我先在plt.plot(x)之前调用plt.ion()然后没有任何显示,我可以继续单步执行lldb。然后,当我退出lldb时,这些情节实际上显示了一瞬间。
我尝试在matplotlibrc中更改后端而没有运气 还尝试了plt.show(block = True)(导致错误日志崩溃) 任何提示都会受到欢迎。
答案 0 :(得分:1)
我无法使plt.show()工作(在lldb断点中)。但以下解决方法适用于我并在lldb断点中显示matplotlib图像(使用Xcode 7,lldb-340.4.70):
def bp1(frame, bp_loc, dict):
"""Use matplotlib in an Xcode breakpoint.
Add with: br com add -F cmd.bp1
"""
import matplotlib.pyplot as plt, numpy as np, sys
# The following addition to the path may not be required in your case
sys.path.append("/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages")
from PIL import Image
print ("hit bp1")
# Some example plot (sine curve)
fig = plt.figure()
Fs = 8000
f = 5
sample = 8000
x = np.arange(sample)
y = np.sin(2 * np.pi * f * x / Fs)
fig.gca().plot(x, y)
# Save figure to image
fileName = "/Users/<username>/tempwork/lldb_pic.png"
fig.savefig(fileName)
# Open image from filesystem and show with PIL
img = Image.open(fileName)
img.show()
return True # False = continue execution, True = stop execution in debugger (lldb prompt)