Update of /cvsroot/pywin32/pywin32/win32/Demos
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv1719/win32/Demos
Added Files:
mmapfile_demo.py
Log Message:
Test out mmapfile functions
--- NEW FILE: mmapfile_demo.py ---
import win32api, mmapfile
import tempfile, os
system_info=win32api.GetSystemInfo()
page_size=system_info[1]
alloc_size=system_info[7]
fname=tempfile.mktemp()
mapping_name=os.path.split(fname)[1]
fsize=8*page_size
print fname, fsize, mapping_name
m1=mmapfile.mmapfile(File=fname, Name=mapping_name, MaximumSize=fsize)
m1.seek(100)
m1.write_byte('?')
m1.seek(-1,1)
assert m1.read_byte()=='?'
## A reopened named mapping should have exact same size as original mapping
m2=mmapfile.mmapfile(Name=mapping_name, File=None, MaximumSize=fsize*2)
assert m2.size()==m1.size()
m1.seek(0,0)
m1.write(fsize*'s')
assert m2.read(fsize)==fsize*'s'
move_src=100
move_dest=500
move_size=150
m2.seek(move_src,0)
assert m2.tell()==move_src
m2.write('m'*move_size)
m2.move(move_dest, move_src, move_size)
m2.seek(move_dest, 0)
assert m2.read(move_size) == 'm' * move_size
## m2.write('x'* (fsize+1))
m2.close()
m1.resize(fsize*2)
assert m1.size()==fsize * 2
m1.seek(fsize)
m1.write('w' * fsize)
m1.flush()
m1.close()
os.remove(fname)
## Test a file with size larger than 32 bits
## need 10 GB free on drive where your temp folder lives
fname_large=tempfile.mktemp()
mapping_name='Pywin32_large_mmap'
offsetdata='This is start of offset'
## Deliberately use odd numbers to test rounding logic
fsize = (1024*1024*1024*10) + 333
offset = (1024*1024*32) + 42
view_size = (1024*1024*16) + 111
## round mapping size and view size up to multiple of system page size
if fsize%page_size:
fsize += page_size - (fsize%page_size)
if view_size%page_size:
view_size += page_size - (view_size%page_size)
## round offset down to multiple of allocation granularity
offset -= offset%alloc_size
m1=None
m2=None
try:
m1=mmapfile.mmapfile(fname_large, mapping_name, fsize, 0, offset*2)
m1.seek(offset)
m1.write(offsetdata)
## When reopening an existing mapping without passing a file handle, you have
## to specify a positive size even though it's ignored
m2=mmapfile.mmapfile(File=None, Name=mapping_name, MaximumSize=1,
FileOffset=offset, NumberOfBytesToMap=view_size)
assert m2.read(len(offsetdata))==offsetdata
finally:
if m1 is not None:
m1.close()
if m2 is not None:
m2.close()
if os.path.exists(fname_large):
os.remove(fname_large)
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