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How To Read Large File in Multiple Parts
Keywords: Binary Read BinaryReadEx BinaryRead Large Big GB File Chunks
; Example how to read big file in multiple parts.
#DefineFunction udfHuge_Compare (hugeNum1, hugeNum2)
;This UDF assumes that the HugeMath extender has been previously loaded.
hugeNum = huge_Subtract (hugeNum1, hugeNum2)
If StrSub (hugeNum, 1, 1) == "-" Then Return -1
If hugeNum == "0" Then Return 0
Return 1
#EndFunction
AddExtender ("WWHUG34i.DLL")
strMsgTitle = "Demo: Read big file in multiple parts."
BoxOpen (strMsgTitle, "")
; Create testfile, please wait ......
strFilename = "K:\TEST.BIN"
hugeFileSize = huge_Multiply (1 << 30, 40) ; "42949672960" ; 40,0 GB (42.949.672.960 Bytes).
BoxText ("Writing test file: " : strFilename : @LF : "Size: " : hugeFileSize)
hdlBB = BinaryWriteEx (0, 0, strFilename, hugeFileSize, -1) ; 40 GB.
; Define chunk size.
hugeBBSize = huge_Multiply (1 << 20, 100) ; 100 MB chunk size.
hdlBB = BinaryAlloc (hugeBBSize) ; Physical memory is the limit.
; Loop through the parts.
intCount = 0
hugeOffset = "0"
While @TRUE
intCount = intCount + 1
hugeBytesRead = "" : BinaryReadEx (hdlBB, 0, strFilename, hugeOffset, hugeBBSize)
BoxText ("Count: " : intCount : @LF : "Offset: " : hugeOffset : @LF : "Bytes read: " : hugeBytesRead)
; Do something with the data in the binary buffer.
; Calculate start address for the next part.
hugeOffset = huge_Add (hugeOffset, hugeBBSize)
If udfHuge_Compare (hugeOffset, hugeFileSize) == 1 Then Break
EndWhile
hdlBB = BinaryFree (hdlBB)
Message (strMsgTitle, "Ready.")
BoxShut ()
Exit
Article ID: W17936
Filename: How To Read Large File in Multiple Parts.txt
File Created: 2009:08:10:13:45:50
Last Updated: 2009:08:10:13:45:50