Question

I am using ImageMagick library with Python ctypes. I wrote a following simple code, but it crashes with segmentation fault (KERN_INVALID_ADDRESS) in Mac:

from ctypes import *
from ctypes.util import find_library

lib = CDLL(find_library( MagickWand ))
lib.MagickWandGenesis()
wand = lib.NewMagickWand()
lib.MagickReadImage(wand,  mona-lisa.jpg )
lib.DestroyMagickWand(wand)
lib.MagickWandTerminus()

该公司在北纬度和视窗两方面都运行良好,但只在麦克斯温斯角运行。我以各种方式建立了图像模型(官方双轨制包、家装、传统<代码>/configure &&使),但每次试验都坠毁。

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x00000000009a7638
0x000000010149a8d1 in MagickReadImage ()

不仅在<代码>MagickReadImage()功能上,IsMagickWand(功能也发生故障。我只想NewMagickWand(>回到错误的点子,或ctype in Mac Hands Pointers不正确,但我并不肯定。

这种情况有什么错误?

Answer 1

Most likely this is a 32/64 bit issue. Is the Mac version the only 64 bit process that you ve tested? Or perhaps you got lucky in the Windows and Linux versions in that they happen to return pointers of the form 0x00000000xxxxxxxx.

wand = lib.NewMagickWand()

NewMagick 谁回到了一位点子,但你没有听说过哪类人期望一位点子。目前的回归价值为32倍的ger。在你打电话之前添加这一条。

lib.NewMagickWand.restype = c_void_p

这说明,新南威尔士工人返回点的类型。

Answer 2

我修改了以下法典:

lib.MagickReadImage(wand,  mona-lisa.jpg )

:

f2 = lib.MagickReadImage
f2.argtypes = [c_void_p, c_char_p]
f2(wand,  mona-lisa.jpg )

因此,它运作良好。

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