我試圖重現類似的事情在On Windows, how to open for writing a file already opened for writing by another process? 所以我後面的Piotr Dobrogost答案,從Using a struct as a function argument with the python ctypes module modyfing代碼,更改標誌和屬性,以我的目的(從這裏https://msdn.microsoft.com/en-us/library/windows/desktop/aa363858(v=vs.85).aspx這裏http://unix.superglobalmegacorp.com/Net2/newsrc/sys/fcntl.h.html拍攝),並加入了Python (使用3.3版本)open
功能: 從操作系統導入路徑 從ctypes的導入* 從ctypes.wintypes導入*在Python中,如何傳遞ctypes文件描述符來打開文件?
GENERIC_READ = 0x80000000
GENERIC_WRITE = 0x40000000
FILE_SHARE_DELETE = 0x00000004
FILE_SHARE_READ = 0x00000001
FILE_SHARE_WRITE = 0x00000002
FILE_SHARE_READ_WRITE = (FILE_SHARE_READ | FILE_SHARE_WRITE)
OPEN_EXISTING = 3
FILE_ATTRIBUTE_NORMAL = 128
FILE_ATTRIBUTE_TEMPORARY = 256
O_RDONLY = 0x0000 # open for reading only
O_WRONLY = 0x0001 # open for writing only
O_RDWR = 0x0002 # open for reading and writing
O_ACCMODE = 0x0003 # mask for above modes
O_APPEND = 0x0008 # set append mode
INVALID_HANDLE_VALUE = -1
LPOVERLAPPED = c_void_p
LPSECURITY_ATTRIBUTES = c_void_p
NULL = 0
FALSE = BOOL(0)
TRUE = BOOL(1)
def CreateFile(filename, access, sharemode, creation, flags):
return HANDLE(windll.kernel32.CreateFileW(
LPWSTR(filename),
DWORD(access),
DWORD(sharemode),
LPSECURITY_ATTRIBUTES(NULL),
DWORD(creation),
DWORD(flags),
HANDLE(NULL)
))
def translate_path(fpath):
fpath = path.abspath(fpath)
if fpath[len(fpath)-1] == '\\' and fpath[len(fpath)-2] == ':':
fpath = fpath[:len(fpath)-1]
return '\\??\\%s' % fpath
link_name = 'G:\\MATLAB\\Chronos_Python\\test.txt'
link_name = path.abspath(link_name)
hFile = CreateFile(link_name, GENERIC_READ, FILE_SHARE_WRITE, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL)
if hFile == HANDLE(INVALID_HANDLE_VALUE):
raise Exception('Failed to open directory for junction creation.')
cFile = ctypes.cdll.msvcrt._open_osfhandle(hFile,O_RDONLY)
pyFile = open(cFile,'r')
pyFile.read()
pyFile.close()
ctypes.cdll.msvcrt._close(cFile)
windll.kernel32.CloseHandle(hFile)
但在該行pyFile = open(cFile,'r')
我得到
OSError: [Errno 9] Bad file descriptor
這可能是非常基本的東西,因爲我是一個Python的新手... 我非常感謝,如果有人能幫我修復它。
這裏最大的錯誤是調用msvcrt.dll中的'_open_osfhandle'函數 - Windows系統DLL的私有C運行時(很多MinGW濫用)。這個CRT與CPython無關。你應該使用Python的'msvcrt'模塊來分配文件描述符。 – eryksun
@eryksun謝謝!我已經使用了'msvcrt.open_osfhandle(hFile.value,O_RDONLY)'(我不得不使用'.value'來獲得'int'類型,否則我得到TypeError),現在它工作。 – Remolek