Python：WindowsError：异常：访问冲突读取为0x00000000 [英] Python: WindowsError: exception: access violation reading 0x00000000

问题描述

这个短函数只是获取存储设备的可用空间，但是在运行代码时出现上述错误。

This short function is simply getting the available free space of a storage device, however I am getting the above error when running the code.

该函数是：

def disk_space1(drive):
    freespace = ctypes.c_ulonglong()
    calcspace = ctypes.windll.kernel32.GetDiskFreeSpaceExA
    calcspace(drive, ctypes.byref(freespace))
    disk_size = freespace.value
    return disk_size

此功能一直有效，直到今天无故停止运行，我没有做任何更改。最让我感到困惑的是该函数正常运行，如果我在运行它后打印出自由空间的值，它就消失了，找到了正确的值，但仍然给出了错误。

This function worked perfectly until today when it has stopped working for no reason, I haven't changed anything. What's baffling me the most is that the function works properly, if I print out the value of 'freespace' once running it, it has gone and found the correct value, but still gives the error.

是什么引起了此问题？

推荐答案

您没有调用我认为是的完整功能签名导致访问冲突（由于随机存储器写入）和错误。完整功能签名（完整记录为 ）：

You are not calling the full function signature which I believe is leading to access violations (due to random memory writes) and errors. The full function signature is (fully documented here):

BOOL WINAPI GetDiskFreeSpaceEx(
  _In_opt_   LPCTSTR lpDirectoryName,
  _Out_opt_  PULARGE_INTEGER lpFreeBytesAvailable,
  _Out_opt_  PULARGE_INTEGER lpTotalNumberOfBytes,
  _Out_opt_  PULARGE_INTEGER lpTotalNumberOfFreeBytes
);

通过将函数更改为：

def disk_space(drive):
    freespace = ctypes.c_ulonglong()
    calcspace = ctypes.windll.kernel32.GetDiskFreeSpaceExA
    err = calcspace(drive,
                    ctypes.byref(freespace),
                    None,
                    None)
    assert err != 0, 'calcspace failed'
    disk_size = freespace.value
    return disk_size

我能够运行它而不会出现间歇性错误。

I was able to run it without intermittent error.

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