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Global $sData, $sData2

; exemple d'utilisation  :
$sData = _CRC32ForFile("C:\downloads\titi\tortue.jpg")
$sData2 = _CRC32ForFile("C:\downloads\titi\elephant.jpg")
; resultat :
MsgBox(0,"CRC32",$sData&" : "&$sData2)


; #FUNCTION# ;===============================================================================
;
; Name...........: _CRC32ForFile
; Description ...: Calculates CRC32 value for the specific file.
; Syntax.........: _CRC32ForFile ($sFile)
; Parameters ....: $sFile - Full path to the file to process.
; Return values .: Success - Returns CRC32 value in form of hex string
;                          - Sets @error to 0
;                  Failure - Returns empty string and sets @error:
;                  |1 - CreateFile function or call to it failed.
;                  |2 - CreateFileMapping function or call to it failed.
;                  |3 - MapViewOfFile function or call to it failed.
;                  |4 - RtlComputeCrc32 function or call to it failed.
; Author ........: trancexx
;
;==========================================================================================
Func _CRC32ForFile($sFile)

    Local $a_hCall = DllCall("kernel32.dll", "hwnd", "CreateFileW", _
            "wstr", $sFile, _
            "dword", 0x80000000, _ ; GENERIC_READ
            "dword", 3, _ ; FILE_SHARE_READ|FILE_SHARE_WRITE
            "ptr", 0, _
            "dword", 3, _ ; OPEN_EXISTING
            "dword", 0, _ ; SECURITY_ANONYMOUS
            "ptr", 0)

    If @error Or $a_hCall[0] = -1 Then
        Return SetError(1, 0, "")
    EndIf

    Local $hFile = $a_hCall[0]

    $a_hCall = DllCall("kernel32.dll", "ptr", "CreateFileMappingW", _
            "hwnd", $hFile, _
            "dword", 0, _ ; default security descriptor
            "dword", 2, _ ; PAGE_READONLY
            "dword", 0, _
            "dword", 0, _
            "ptr", 0)

    If @error Or Not $a_hCall[0] Then
        DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hFile)
        Return SetError(2, 0, "")
    EndIf

    DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hFile)

    Local $hFileMappingObject = $a_hCall[0]

    $a_hCall = DllCall("kernel32.dll", "ptr", "MapViewOfFile", _
            "hwnd", $hFileMappingObject, _
            "dword", 4, _ ; FILE_MAP_READ
            "dword", 0, _
            "dword", 0, _
            "dword", 0)

    If @error Or Not $a_hCall[0] Then
        DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hFileMappingObject)
        Return SetError(3, 0, "")
    EndIf

    Local $pFile = $a_hCall[0]
    Local $iBufferSize = FileGetSize($sFile)

    Local $a_iCall = DllCall("ntdll.dll", "dword", "RtlComputeCrc32", _
            "dword", 0, _
            "ptr", $pFile, _
            "int", $iBufferSize)

    If @error Or Not $a_iCall[0] Then
        DllCall("kernel32.dll", "int", "UnmapViewOfFile", "ptr", $pFile)
        DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hFileMappingObject)
        Return SetError(4, 0, "")
    EndIf

    DllCall("kernel32.dll", "int", "UnmapViewOfFile", "ptr", $pFile)
    DllCall("kernel32.dll", "int", "CloseHandle", "hwnd", $hFileMappingObject)

    Local $iCRC32 = $a_iCall[0]

    Return SetError(0, 0, Hex($iCRC32))

EndFunc   ;==>_CRC32ForFile