Displaying 6 results from an estimated 6 matches for "file_flag_no_buff".
2007 Sep 25
2
Using callbacks with ReadFileEx
...hronize
class Error < StandardError; end
def self.read_async(file, length=nil, offset=0, &block)
handle = CreateFile(
file,
FILE_READ_DATA,
FILE_SHARE_READ,
0,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING,
0
)
if handle == INVALID_HANDLE_VALUE
raise Error, get_last_error
end
func = Win32::API::Callback.new(''LLP'', ''V''){
block.call
}
overlapped = 0.chr * 20...
2004 Nov 17
1
nread and nwrite optimizations
...d
sucked it into memory using Ruby''s File#read method just fine. However,
when I tried to use File#nread, it eventually died with a memory
allocation error. Since I have 1GB of RAM (and wasn''t using much), I''m
not sure why it would complain.
The second issue is getting FILE_FLAG_NO_BUFFERING to work. Mostly I
just want to see if this will lead to a significant performance increase
with reads and writes. But, using it has certain requirements that I
don''t totally understand.
Any ideas for these two issues are definitely welcome.
Dan
2010 Mar 25
4
CreateFile \\\\.\\x: non-root
Hello,
I have a usb data aquisition device interfaced by mass storage protocol. I open it like:
hEcgDrive=CreateFile("\\\\.\\g:",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_NO_BUFFERING |
FILE_FLAG_WRITE_THROUGH | FILE_FLAG_OVERLAPPED,
NULL);
for communication I use
DeviceIoControl(hEcgDrive,
IOCTL_SCSI_PASS_THROUGH_DIRECT,
....
with a 'custom' scsi operation code as wrapper.
On Wine-1.1.30. under UHU linux (2.6.23.9-1) the program can open the device only if ru...
2004 Nov 25
0
getdiskfreespace
Hi all,
I was just working on the FILE_FLAG_NO_BUFFERING stuff again. I''m a little
confused about determining the cluster size. According to the MSDN docs,
using GetDiskFreeSpace() on disks over 2GB may return incorrect values.
Some threads on comp.os.ms-windows.* seem to support this as well.
I did come across this, however:
http:/...
2007 Oct 09
5
Playing with ReadFileScatter()
...::MSVCRT::IO
extend Windows::SystemInfo
include Windows::File
def self.readlines(file, sep = $INPUT_RECORD_SEPARATOR)
handle = CreateFile(
file,
GENERIC_READ,
FILE_SHARE_READ,
nil,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING,
nil
)
if handle == INVALID_HANDLE_VALUE
raise SystemCallError.new(GetLastError())
end
sysbuf = 0.chr * 40
GetSystemInfo(sysbuf)
page_size = sysbuf[8,4].unpack(''L'')[0] # dwPageSize
file_size = File.size...
2008 Mar 21
0
Wine release 0.9.58
...printf format warnings.
makefiles: Consider all .res files as object files.
winex11: Store a pointer to the X11 event currently being handled instead of a simple count.
ntdll: Implemented NtReadFileScatter.
ntdll: Implemented NtWriteFileGather.
kernel32: Propagate the FILE_FLAG_NO_BUFFERING CreateFile flag to ntdll.
kernel32: Implemented ReadFileScatter and WriteFileGather.
shell32/tests: Remove spurious linefeeds in error messages.
winex11: Fix bug report address.
winex11: Fix typo that was causing superfluous updates of the visible rect.
winex11: A...