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NTFS File Time Stamps
Keywords: GetFileTime API DLLCALL file time stamp
Question:
I know NTFS file time stamps reflect Daylight Savings (changing the time stamp in Oct & April). MS recommends using the GetFileTime() API call to get the UTC time stamp of the file, is there a way in WB to get this stamp? All WB functions I tried seem to return the locally adjusted stamp, which causes comparison issues since I stored the TimeDate in a file (Oct 27 the same files appear different due to the hr offset).Answer:
Here is an UDF that makes a dllcall to the GetFileTime API, you were referring to.
#DefineFunction GetFileTime(file,request)
;BOOL GetFileTime(
; HANDLE hFile,
; LPFILETIME lpCreationTime = 1
; LPFILETIME lpLastAccessTime = 2
; LPFILETIME lpLastWriteTime = 3
;)
hdl = FileOpen(file,"READ")
Kernel32 = DllLoad(strcat(dirwindows(1),"Kernel32.DLL"))
lpCreationTime = BinaryAlloc(8)
lpLastAccessTime = BinaryAlloc(8)
lpLastWriteTime = BinaryAlloc(8)
ret = DllCall(Kernel32,long:"GetFileTime",long:hdl,lpbinary:lpCreationTime,lpbinary:lpLastAccessTime,lpbinary:lpLastWriteTime)
if ret == 0
Message("GetFileTime Error",DllLastError())
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
DllFree(Kernel32)
FileClose(hdl)
return 0
endif
BinaryEodSet(lpCreationTime,8)
BinaryEodSet(lpLastAccessTime,8)
BinaryEodSet(lpLastWriteTime,8)
lpdatebuffer = BinaryAlloc(8)
Switch request
case 1
if BinaryEodget(lpCreationTime) == 0
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
BinaryFree(lpdatebuffer)
DllFree(Kernel32)
FileClose(hdl)
return ""
endif
BinaryPoke4(lpdatebuffer,0,BinaryPeek4(lpCreationTime,0))
BinaryPoke4(lpdatebuffer,4,BinaryPeek4(lpCreationTime,4))
break
case 2
if BinaryEodget(lpLastAccessTime) == 0
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
BinaryFree(lpdatebuffer)
DllFree(Kernel32)
FileClose(hdl)
return ""
endif
BinaryPoke4(lpdatebuffer,0,BinaryPeek4(lpLastAccessTime,0))
BinaryPoke4(lpdatebuffer,4,BinaryPeek4(lpLastAccessTime,4))
break
case 3
if BinaryEodget(lpLastWriteTime) == 0
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
BinaryFree(lpdatebuffer)
DllFree(Kernel32)
FileClose(hdl)
return ""
endif
BinaryPoke4(lpdatebuffer,0,BinaryPeek4(lpLastWriteTime,0))
BinaryPoke4(lpdatebuffer,4,BinaryPeek4(lpLastWriteTime,4))
break
case request ; default case
Message("Error", "Invalid request specified")
break
EndSwitch
;BOOL FileTimeToSystemTime(
; const FILETIME* lpFileTime,
; LPSYSTEMTIME lpSystemTime)
lpformateddate = BinaryAlloc(16)
ret = DllCall(Kernel32,long:"FileTimeToSystemTime",lpbinary:lpdatebuffer,lpbinary:lpformateddate)
if ret == 0
Message("FileTimeToSystemTime Error",DllLastError())
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
BinaryFree(lpdatebuffer)
BinaryFree(lpFormatedDate)
DllFree(Kernel32)
FileClose(hdl)
return 0
endif
year = BinaryPeek2(lpformateddate,0)
month = StrFixLeft(BinaryPeek2(lpformateddate,2),"0",2)
day = StrFixLeft(BinaryPeek2(lpformateddate,6),"0",2)
hours = StrFixLeft(BinaryPeek2(lpformateddate,8),"0",2)
minutes = StrFixLeft(BinaryPeek2(lpformateddate,10),"0",2)
seconds = StrFixLeft(BinaryPeek2(lpformateddate,12),"0",2)
ymdhms = StrCat(year,":",month,":",day,":",hours,":",minutes,":",seconds)
BinaryFree(lpCreationTime)
BinaryFree(lpLastAccessTime)
BinaryFree(lpLastWriteTime)
BinaryFree(lpdatebuffer)
BinaryFree(lpformateddate)
FileClose(hdl)
return ymdhms
#EndFunction
;Main code
file = "C:\temp\test.txt"
ymdhms = GetFileTime(file,1)
Message( "GetFileTime",ymdhms)
Article ID: W15486
File Created: 2009:04:01:11:19:44
Last Updated: 2009:04:01:11:19:44