LockFile Function

[Jango]

Hello,

I'm looking for a way to lock a file for exclusive access and i found this:

LockFile Function

But how to do it in AutoIt ? Is a FileOpen sufficient ?

[herewasplato]

it has been requested and was being worked on http://www.autoitscript.com/trac/autoit/ticket/546

[KaFu]

Try if this works for you, then I'll create a UDF of it ...

#include <winapi.au3>

$File = @ScriptDir & '\test.txt'

$hFile = _WinAPI_CreateFile($File,2,2,2)

DllCall("Kernel32.dll", "hwnd", "LockFile", "hwnd", $hFile, "dword", 1, "dword", 0, "dword", 1, "dword", 0)

while MsgBox(0,'','File Locked') <> 1
    sleep(10)
WEnd

_WinAPI_CloseHandle($hFile)

while MsgBox(0,'','File Unlocked') <> 1
    sleep(10)
WEnd

or this, even easier ...

$File = @ScriptDir & '\test.txt'

$hFile = FileOpen($File,1)

DllCall("Kernel32.dll", "hwnd", "LockFile", "hwnd", $hFile, "dword", 1, "dword", 0, "dword", 1, "dword", 0); Set file lock

FileWriteLine($hFile,"line1")
FileWriteLine($hFile,"line2")
FileWriteLine($hFile,"line3")

while MsgBox(0,'','File Locked') <> 1
    sleep(10)
WEnd

FileClose($hFile); unlocks file

while MsgBox(0,'','File Unlocked') <> 1
    sleep(10)
WEnd

but strange dllcall returns 0, _WinAPI_GetLastErrorMessage() returns 'The handle is invalid.'... but the file is locked for me anyhow ...

Edited February 10, 2009 by KaFu

[KaFu]

Ah, okay, I see why _WinAPI_GetLastErrorMessage() returns the error, cause the dllcall isn't working at all .

$hFile = FileOpen($File,1)

is totally sufficient to lock the file. Open a handle if you want it locked and close it if you want the file locked, that's all.

[Authenticity]

If you want to lock the whole file you can just open it with iShare set to 0. If you do want the file to be accessible but to lock only parts of it you can use LockFileEx, but the function returns BOOL (int) rather than hwnd.

[Jango]

If you want to lock the whole file you can just open it with iShare set to 0. If you do want the file to be accessible but to lock only parts of it you can use LockFileEx, but the function returns BOOL (int) rather than hwnd.

Thank you. To learn, this is really a nice forum with nice people.

[KaFu]

If you want to lock the whole file you can just open it with iShare set to 0. If you do want the file to be accessible but to lock only parts of it you can use LockFileEx, but the function returns BOOL (int) rather than hwnd.

Nice to know ... does Fileopen set iShare to 0? Seems so to me.