DLL help

[d4rk]

hello every1, i have this simple code to check a file's size, but i can't make it works, can some1 tell me why ?

thanks for reply

MsgBox(64,"",DllCall("kernel32.dll","dword","GetFileSizeEx","str","D:\Music\Ranh Gioi Thien Ac - Lil Knight.mp3","int",0))

[SmOke_N]

hello every1, i have this simple code to check a file's size, but i can't make it works, can some1 tell me why ?

thanks for reply

MsgBox(64,"",DllCall("kernel32.dll","dword","GetFileSizeEx","str","D:\Music\Ranh Gioi Thien Ac - Lil Knight.mp3","int",0))

2. Not only do you have to get the parameters right (which you don't have), you also need to create any types/unions/structs that are necessary.

You can't just magically call something and hope it works.

[smashly]

Couple of reasons your call fails.

1st the call requires the handle to a file, not a file path.

2nd A pointer to a LARGE_INTEGER structure that receives the file size, in bytes is meant to be used for the last value ptr not an int. So I gather you would need to get the file size from the LARGE_INTEGER struct if the return of the dll call is anything different to 0

Myself I don't understand the LARGE_INTEGER struct and how it's set up.

I tried the dll call using the standard "GetFileSize" and it returns the size of the file, but the "GetFileSizeEx" I don't quite understand.

To get a handle to the file I used _WinAPI_CreateFile() function which can open a file and return a handle.

#Include <WinAPI.au3>
Local $FilePath, $hFile, $aRet
$FilePath = @HomeDrive & "\NTDETECT.COM"

$hFile = _WinAPI_CreateFile($FilePath, 2, 2)
If $hFile <> 0 Then 
    $aRet = DllCall("kernel32.dll","int","GetFileSize","int",$hFile,"int",0)
    If IsArray($aRet) Then MsgBox(64, $FilePath, $aRet[0] & " bytes")
EndIf

[d4rk]

Thanks for reply, i'm just starting with DLL and i'm just trying to show some efforts

i'll read your posts carefully and will back with a specific question

thanks