Closes the file Subsequent operations will result in an exception in .NET

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mfind(string[, start])
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Returns the index of the first occurrence of string start specifies an optional starting position Returns -1 if no match is found
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mflush([offset, size])
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Flushes modifications of the in-memory copy back to the file system offset and size specify an optional range of bytes to flush Otherwise, the entire mapping is flushed
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mmove(dst,src,count)
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Copies count bytes starting at index src to the destination index dstThis copy is performed using the C memmove() function, which is guaranteed to work correctly when the source and destination regions happen to overlap
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mread(n)
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Reads up to n bytes from the current file position and returns the data as a string
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mread_byte()
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Reads a single byte from the current file position and returns as a string of length 1
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mreadline()
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Returns a line of input starting at the current file position
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mresize(newsize)
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Resizes the memory-mapped object to contain newsize bytes
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mseek(pos[, whence])
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Sets the file position to a new value pos and whence have the same meaning as for the seek() method on file objects
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msize()
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Returns the length of the fileThis value may be larger than the size of the memorymapped region
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mtell()
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Returns the value of the file pointer
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19 Operating System Services
mwrite(string)
Writes a string of bytes to the file at the current file pointer
mwrite_byte(byte)
Writes a single byte into memory at the current file pointer
Notes
Although UNIX and Windows supply slightly different mmap() functions, this module can be used in a portable manner by relying on the optional access parameter that is common to both functions For example, mmap(fileno,length,access=ACCESS_WRITE) will work on both UNIX and Windows Certain memory mapping may only work with a length that s a multiple of the system page size, which is contained in the constant mmapPAGESIZE On UNIX SVR4 systems, anonymous mapped memory can be obtained by calling mmap() on the file /dev/zero, opened with appropriate permissions On UNIX BSD systems, anonymous mapped memory can be obtained by calling mmap() with a negative file descriptor and the flag mmapMAP_ANON
msvcrt
The msvcrt module provides access to a number of useful functions in the Microsoft Visual C runtime libraryThis module is available only on Windows
getch()
Reads a keypress and returns the resulting characterThis call blocks if a keypress is not available If the pressed key was a special function key, the call returns '\000' or '\xe0' and the next call returns the keycodeThis function doesn t echo characters to the console, nor can the function be used to read Ctrl+C
getwch()
The same as getch() except that a Unicode character is returned
getche()
Like getch() except that characters are echoed (if printable)
getwche()
The same as getche() except that a Unicode character is returned
get_osfhandle(fd)
Returns the file handle for file descriptor fd Raises IOError if fd is not recognized
heapmin()
Forces the internal Python memory manager to return unused blocks to the operating systemThis works only on Windows NT and raises IOError on failure
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msvcrt
kbhit()
Returns True if a keypress is waiting to be read
locking(fd, mode, nbytes)
Locks part of a file, given a file descriptor from the C runtime nbytes is the number of bytes to lock relative to the current file pointer mode is one of the following integers:
Setting
0 1 2 3 4
Description
Unlocks the file region (LK_UNLCK) Locks the file region (LK_LOCK) Locks the file region; nonblocking (LK_NBLCK) Locks for writing (LK_RLCK) Locks for writing; nonblocking (LK_NBRLCK)
Attempts to acquire a lock that takes more than approximately 10 seconds results in an IOError exception
open_osfhandle(handle, flags)
Creates a C runtime file descriptor from the file handle handle flags is the bitwise OR of osO_APPEND, osO_RDONLY, and osO_TEXT Returns an integer file descriptor that can be used as a parameter to osfdopen() to create a file object
putch(char)
Prints the character char to the console without buffering
putwch(char)
The same as putch() except that char is a Unicode character
setmode(fd, flags)
Sets the line-end translation mode for file descriptor fd flags is osO_TEXT for text mode and osO_BINARY for binary mode
ungetch(char)
Causes the character char to be pushed back into the console buffer It will be the next character read by getch() or getche()
ungetwch(char)
The same as ungetch() except that char is a Unicode character
Note
A wide variety of Win32 extensions are available that provide access to the Microsoft Foundation Classes, COM components, graphical user interfaces, and so forth These topics are far beyond the scope of this book, but detailed information about many of these topics is available in Python Programming on Win32 by Mark Hammond and Andy Robinson (O Reilly & Associates, 2000) Also, http://wwwpythonorg maintains an extensive list of contributed modules for use under Windows
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19 Operating System Services
See Also:
winreg (p 408)