Python 3替代PyFile_AsFile [英] Python 3 replacement for PyFile_AsFile

问题描述

以下代码在Python 2中有效：

The following code works in Python 2:

from ctypes import *

## Setup python file -> c 'FILE *' conversion :
class FILE(Structure):
    pass
FILE_P = POINTER(FILE)
PyFile_AsFile = pythonapi.PyFile_AsFile # problem here
PyFile_AsFile.argtypes = [py_object]
PyFile_AsFile.restype = FILE_P
fp = open(filename,'wb')
gd.gdImagePng(img, PyFile_AsFile(fp))

但是在Python 3中，pythonapi中没有PyFile_AsFile。

But in Python 3, there is no PyFile_AsFile in pythonapi.

代码是 testPixelOps.py 的例外。

推荐答案

我只需要一种将文件对象转换为ctypes FILE *的方法，以便将其传递给GD。

I just needed a way to convert a file object to a ctypes FILE* so that I can pass it to GD.

您不走运。这在Python 2.x中是可能的，但在Python 3.x中是不可能的。 文档说明了为什么不这样做：

You are out of luck. That was possible in Python 2.x, but is not possible in Python 3.x. The documentation explains why not:

这些API是用于内置文件对象的Python 2 C API的最小模拟，该文件过去依赖于C标准库中的缓冲I / O（FILE *）支持。在Python 3中，文件和流使用新的io模块，该模块在操作系统的低级无缓冲I / O上定义了几层。

These APIs are a minimal emulation of the Python 2 C API for built-in file objects, which used to rely on the buffered I/O (FILE*) support from the C standard library. In Python 3, files and streams use the new io module, which defines several layers over the low-level unbuffered I/O of the operating system.

如果需要 FILE * ，则必须直接使用C标准库来自己制作。

If you want a FILE* you are going to have to make one yourself, using the C standard library directly.

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