Code : Tout sélectionner
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
