_WinAPI_SetFilePointer(), _WinAPI_SetEndOfFile()

[Zedna]

I have sent proposition for this new UDF to Gary today.

So here it is.

Example:

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#include <WinAPI.au3>

Global $sFile, $hFile, $sText, $nBytes, $tBuffer

; 1) create file and write data to it
$sFile = @ScriptDir & '\test.txt'
$sText = 'abcdefghijklmnopqrstuvwxyz'
$tBuffer = DLLStructCreate("byte[" & StringLen($sText) & "]")
DLLStructSetData($tBuffer, 1, $sText)
$hFile = _WinAPI_CreateFile($sFile, 1)
_WinAPI_WriteFile($hFile, DLLStructGetPtr($tBuffer), StringLen($sText), $nBytes)
_WinAPI_CloseHandle($hFile)
ConsoleWrite('1) ' & FileRead($sFile) & @LF)

; 2) read 6 bytes from posision 3
$tBuffer = DLLStructCreate("byte[6]")
$hFile = _WinAPI_CreateFile($sFile, 2, 2)
_WinAPI_SetFilePointer($hFile, 3)
_WinAPI_ReadFile($hFile, DLLStructGetPtr($tBuffer), 6, $nBytes)
_WinAPI_CloseHandle($hFile)
$sText = BinaryToString(DLLStructGetData($tBuffer, 1))
ConsoleWrite('2) ' & $sText & @LF)

; 3) write previously read 6 bytes from posision 3 to the same position but in UpperCase
DLLStructSetData($tBuffer, 1, StringUpper($sText))
$hFile = _WinAPI_CreateFile($sFile, 2, 4)
_WinAPI_SetFilePointer($hFile, 3)
_WinAPI_WriteFile($hFile, DLLStructGetPtr($tBuffer), 6, $nBytes)
_WinAPI_CloseHandle($hFile)
$tBuffer = 0
ConsoleWrite('3) ' & FileRead($sFile) & @LF)

; 4) truncate file size to 12 bytes
$hFile = _WinAPI_CreateFile($sFile, 2, 4)
_WinAPI_SetFilePointer($hFile, 12)
_WinAPI_SetEndOfFile($hFile)
_WinAPI_CloseHandle($hFile)
ConsoleWrite('4) ' & FileRead($sFile) & @LF)

All packed in one file as attachment:

EDIT: This is included in AutoIt from 3.2.13.6 version

EDIT2: Removed UDF code from post because now it's in AutoIt standard incudes

udf_zedna.zip

Edited August 4, 2008 by Zedna