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- !Windows Commandline Tricks
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Brute Force Way to Convert an int64 that WinBatch Can Handle
Keywords: 64 64-bit bit int integer QueryUnbiasedInterruptTime bitwise floating point number
Question:
I found an interesting API that is valid on Windows 7 or newer called: QueryUnbiasedInterruptTime. So I thought I would attempt to DllCall this function. However it seems to return a 64-bit integer. Not quite sure how to handle this value since WinBatch does currently support 64 bit integers.Here is what I came up with:
;BOOL QueryUnbiasedInterruptTime(
; _Out_ PULONGLONG UnbiasedTime
;);
If WinVersion( 5 ) < '2-6-1'
Pause('Notice','Not Supported on this Platform')
Exit
EndIf
hDll = DllLoad(DirWindows(1):"kernel32.dll")
lpUnbiasedTime = BinaryAlloc(8)
rslt = DllCall( hDll, long:'QueryUnbiasedInterruptTime',lpBinary:lpUnbiasedTime )
time = BinaryPeekFlt( lpUnbiasedTime, 0 ) ; Peeks a 64 bit floating point number.
Pause('Unbiased interrupt-time count in system time units of 100 nanoseconds.',time)
BinaryFree( lpUnbiasedTime )
Exit
Answer:
Integers and floating point numbers have completely different binary representation. You cannot just pull a the binary representation of an integer out of a buffer and expect it to be a floating point number. You have to do bit wise manipulation (or ugly string conversions) to get the bits in the right order for floating point. so here is a quick-and-dirty, crude, brute force way to convert a an _int64 to something WinBatch can handle. The result are not always correct but it will work most of the time
hUnbiasedTime = BinaryAlloc(8)
nResult = DllCall(DirWindows(1):"kernel32.dll", long:'QueryUnbiasedInterruptTime',lpBinary:hUnbiasedTime )
BinaryEODSet(hUnbiasedTime, 8)
nlower = BinaryPeek4(hUnbiasedTime, 0 )
nupper = BinaryPeek4(hUnbiasedTime, 4 )
; Not likely to ever be negative but for completeness's sake.
if nupper < 0 then nupper = (nupper & 2147483647) * 2.0
nupper = nupper * 4294967296.0
; This on the other hand can often be negative.
if nlower < 0 then nlower = (nlower & 2147483647) * 2.0
; Total and convert to seconds
nUptime = nupper + nlower
nUptime = nUptime/10000000.0
Pause('System Up Time',nUpTime:' sec.')
BinaryFree( hUnbiasedTime )
Exit
Article ID: W17907
Filename: Brute Force Way to Convert an int64 that WinBatch Can Handle.txt
File Created: 2013:07:02:08:06:26
Last Updated: 2013:07:02:08:06:26