[Solved] DllCall & NULL parameter ?

[DXRW4E]

Sorry for my English

Hi All, I'm curious who and pramenter in this case SetupOpenInfFile Function ???

SetupApiEx.au3

Global Const $h_SetupApiDll = DllOpen("SetupApi.dll")
Global Const $h_Kernel32DLL = DllOpen("Kernel32.dll")
Global Const $INF_STYLE_NONE  = 0
Global Const $INF_STYLE_OLDNT = 1 ;A legacy INF file format.
Global Const $INF_STYLE_WIN4  = 2 ;A Windows INF file format.
Global Const $INF_STYLE_NULL  = Null ;; Or AutoIt v3.3.8 Global Const $INF_STYLE_NULL  = "Null"
;;; ERROR_CLASS_MISMATCH  = -536870399
;;; ERROR_WRONG_INF_STYLE = -536870656
;;; ERROR_LINE_NOT_FOUND  = -536870654;

Func _SetupOpenInfFile($FileName, $InfClass = 0, $InfStyle = 0)
    ;;AutoIt v3.3.8
;~   Local $HINF, $sType = "wstr"
;~   If $InfClass = $INF_STYLE_NULL Then $sType = "ptr" ;Thanks ProgAndy
;~   $HINF = DllCall($h_SetupApiDll, "long", "SetupOpenInfFileW", "wstr", $FileName, $sType, $InfClass, "dword", $InfStyle, "uint*", 0)
;~   Return SetError(_WinAPI_GetLastErrorEx(), $HINF[4], $HINF[0])
    $HINF = DllCall($h_SetupApiDll, "long", "SetupOpenInfFileW", "wstr", $FileName, "wstr", $InfClass, "dword", $InfStyle, "uint*", 0)
    Return SetError(_WinAPI_GetLastErrorEx(), $HINF[4], $HINF[0])
EndFunc ;==>_SetupOpenInfFile

Func _SetupGetLineText($Context = 0, $InfHandle = "", $Section = "", $Key = "", $RBSize = 65536)
Local $SGLT, $RBuffer = DllStructCreate("wchar")
$SGLT = DllCall($h_SetupApiDll, "int", "SetupGetLineTextW", "ptr", $Context, "long", $InfHandle, "wstr", $Section, "wstr", $Key, "wstr", DllStructGetPtr($RBuffer), "dword", $RBSize, "dword*", 0)
If Not $SGLT[0] Then Return SetError(_WinAPI_GetLastErrorEx(), $SGLT[0], "")
Return SetError(0, $SGLT[7], $SGLT[5])
EndFunc ;==>_SetupGetLineText

Func _SetupCloseInfFile($InfHandle)
DllCall($h_SetupApiDll, "none", "SetupCloseInfFile", "long", $InfHandle)
EndFunc ;==>_SetupCloseInfFile

Func _WinAPI_GetLastErrorEx()
Local $GetLastError = DllCall($h_Kernel32DLL, "long", "GetLastError")
Return $GetLastError[0]
EndFunc ;==>_WinAPI_GetLastErrorEx

to say more clear this and OK

#include <SetupApiEx.au3>;

;;  Display.inf
;;[Version]
;;signature="$Windows NT$"
;;ClassGUID={4D36E968-E325-11CE-BFC1-08002BE10318}
;;Class=Display
;;
;;[sectionname]
;;KeyName="AAAAAAA"
;;
;;[sectionname2]
;;BBB="BBBBBBBB"
;;
;;[sectionname3]
;;CCC="CCCCCCCC"

local $hInf, $a, $b, $c, $d

$InfClassTest = "Display"
;$InfClassTest = 0
$hInf = _SetupOpenInfFile(@DesktopDir & "display.inf",  $InfClassTest, $INF_STYLE_WIN4)
If Not @Error Then
    $a = _SetupGetLineText(0, $hInf, "SectionName", "KeyName")
EndIf
Msgbox(0, 0, $a)

but if you use the $InfClassTest = 0 (Null ?) fails to work (Return ERROR_CLASS_MISMATCH), when both Microsoft and all their write clear examples that can be used InfClass = Null without problems http://msdn.microsoft.com/en-us/library/aa376965%28v=VS.85%29.aspx

HINF MyInf;             //variable to hold the INF handle
UINT ErrorLine;         //variable to hold errors returned
BOOL test;               //variable to receive function success

MyInf = SetupOpenInfFile (
      szInfFileName,       //the filename of the inf file to open
      NULL,             //optional class information
      INF_STYLE_WIN4,     //the inf style
      &ErrorLine           //line number of the syntax error
);

why can not I open for example layout.inf, for example

[Version]
signature="$Windows NT$"
ClassGUID={00000000-0000-0000-0000-000000000000}
;; Or SetupClass=Base

[sectionname]
AAA="AAAAAAA"

[sectionname2]
BBB="BBB"

[sectionname3]
CCC="CCCCCCCC"

EDIT

all OK, Thanks again ProgAndy

;;  file.inf
;;[Version]
;;signature="$Windows NT$"
;;ClassGUID=ClassGUID={00000000-0000-0000-0000-000000000000}
;;
;;[sectionname]
;;KeyName="AAAAAAA"
;;
;;[sectionname2]
;;BBB="BBBBBBBB"
;;
;;[sectionname3]
;;CCC="CCCCCCCC"

local $hInf, $a, $b, $c, $d

;;;$InfClassTest = "Display"
$InfClassTest = Null ;; Or AutoIt v3.3.8 $InfClassTest = "Null"
$hInf = _SetupOpenInfFile(@DesktopDir & "file.inf",  $InfClassTest, $INF_STYLE_WIN4)
If Not @Error Then
    $a = _SetupGetLineText(0, $hInf, "SectionName", "KeyName")
EndIf
Msgbox(0, 0, $a)

Edited March 29, 2012 by DXRW4E

[ProgAndy]

The current AutoIt-Beta supports the NULL-Keyword: DLLCall(..., "wstr", Null)

In the stable version, you will have to do something like this:

$sType = "wstr"
If Not IsString($value) And $value = 0 Then $sType = "ptr"
DLLCall(..., $sType, $value)

[DXRW4E]

Hi ProgAndy, it seems that everything works OK

Thank You Very Much

Ciao.