Windows API: Using Large Integers (64bit) in Clarion applications 2002-04-01 -- Paul van Drunick Newsgroups: comp.lang.clarion
Large integers (64 bit) and Win API GetDiskFreeSpaceEx. A contribution to
the community.
The last couple of days I was struggling with the Win API
GetDiskFreeSpaceEx. This API takes large integers of 64 bit as parameters.
Ulong is 32 bit and the largest integer in Clarion and GetDiskFreeSpace
works only well with max. 2GB.
So I looked around and gathered information from all kind of sources like
the Clarion community and Microsoft to make a working solution. I did not
find a ready working solution so had to do some thinking for my self.
Well I did and find the following working solution. Next I thought why
struggle all when one is enough. So here is my working solution for all who
are looking for something similar and as a thank you to those who gave me
some answers in the past and hopefully again in the future.
I'm always in for improvement so if somebody has something to add to this
code .
With kind regards,
Paul van Drunick
DruSoft Software
Netherlands
www.drusoft.nl
info@drusoft.nl
The code:
In WinApi.CLW:
LARGEINTEGER GROUP,TYPE
dwLowPart long
dwHighPart long
END
! You have to create a kernel32.lib with this api in it (with libmaker and
kernel32.dll)
! and add it to your project. This api is not in the clarion libs and
! only compatible with Win 95-OSR2/98/NT 4.0/2000/XP
MODULE('KERNEL32.DLL')
GetDiskFreeSpaceEx(*LPCSTR,*LARGEINTEGER,*LARGEINTEGER,*LARGEINTEGER),BOOL,P
ASCAL,RAW,NAME('GetDiskFreeSpaceExA')
END
Code for your function or method:
SomeFunction PROCEDURE
lintFreeBytesCaller group(LARGEINTEGER)
end
lintTotalBytes group(LARGEINTEGER)
end
lintFreeBytes group(LARGEINTEGER)
end
decFreeBytesLow DECIMAL(31) ! max decimal is not enough for
! max result of
! 3,3161584934796709483252973253515e+327
decFreeBytesHigh DECIMAL(31) ! but is enough for this purpose
! maybe someone
knows an alternative?
decFreeBytes DECIMAL(31)
cstrPath CSTRING(MAX_PATH)
CODE
cstrPath = clip(SomePath)
if GetDiskFreeSpaceEx(cstrPath, lintFreeBytesCaller, lintTotalBytes,
lintFreeBytes) then .
! you can also use lintFreeBytesCaller (users free space in this path)
if lintFreeBytes.dwLowPart < 0
decFreeBytesLow = 2 ^ 32 + lintFreeBytes.dwLowPart
else
decFreeBytesLow = lintFreeBytes.dwLowPart
end
if lintFreeBytes.dwHighPart < 0
decFreeBytesHigh = 2 ^ 32 + lintFreeBytes.dwHighPart
else
decFreeBytesHigh = lintFreeBytes.dwHighPart
end
decFreeBytes = decFreeBytesLow + decFreeBytesHigh * 2 ^ 32
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