Gigabyte dll functions

[Olli]

Maybe start up a disassembler and investigate on your own? How about IDA 4.3 Freeware?

[Razor]

Well i wouldnt know even where to start,all i found is this but what does this mean?Does it contain any parameters,well i doubt so.

Zitat:

public LX_IsQDIMainBoard
LX_IsQDIMainBoard proc near
or eax, 0FFFFFFFFh ; LX_IsMSIMainBoard
retn
LX_IsQDIMainBoard endp

Can someone translate this?To delphi..

Zitat:

#include <windows.h>
#include <stdio.h>

typedef int (*isgigabytemobo)(void);

int main()
{
HMODULE hGigabyteLib = NULL;
isgigabytemobo LX_IsGigaMainBoard = NULL;

hGigabyteLib = LoadLibrary(L"W83781D.DLL");

if (hGigabyteLib != NULL)
{
printf("Library loaded: W83781D.DLL.\n");

LX_IsGigaMainBoard = (isgigabytemobo)GetProcAddress(hGigabyteLib, "LX_IsGigaMainBoard");

if (LX_IsGigaMainBoard != NULL)
{
printf("Found LX_IsGigaMainBoard.\n");

printf("i: %i.\n", LX_IsGigaMainBoard());
}
else
printf("Could not find LX_IsGigaMainBoard.\n");

FreeLibrary(hGigabyteLib);
}
else
printf("Couldn't load library W83781D.DLL.\n");

system("pause");

return 0;
}

[Olli]

Zitat:

Zitat von Razor

Well i wouldnt know even where to start,all i found is this but what does this mean?Does it contain any parameters,well i doubt so.

Zitat:

public LX_IsQDIMainBoard
LX_IsQDIMainBoard proc near
or eax, 0FFFFFFFFh ; LX_IsMSIMainBoard
retn
LX_IsQDIMainBoard endp

No parameters. It just returns 0xFFFFFFFF, which is another way of saying -1 (32bit) or setting all bits in a LongBool to 1.

Zitat:

Zitat von Razor

Can someone translate this?To delphi..

The important part is

Code:

typedef int (*isgigabytemobo)(void);

which says that:

Delphi-Quellcode:

type TFNisgigabytemobo = function(): Integer; cdecl;

(where cdecl is not important, because no params are being passed)

[Razor]

Even though if a function doesnt have a parameter can it be called?I guess than it will only return 0 or -1 ,yes or no

[Olli]

Of course can a function without parameters be called.

Given the short disassembly excerpt, this function returns exactly ONE value: -1

But I presume that the actual meaning is BOOL (i.e. LongBool in Delphi) and that this is supposed to return -1 or 0, yes.

[Razor]

public LX_IsQDIMainBoard
LX_IsQDIMainBoard proc near
or eax, 0FFFFFFFFh ; LX_IsMSIMainBoard
retn
LX_IsQDIMainBoard endp


So this is accuall boolean function that returns -1 or 0 ,you can also sometime see the parameter in the name of the function.Is can only be boolean.

[Olli]

Zitat:

Zitat von Razor

So this is accuall boolean function that returns -1 or 0 ,you can also sometime see the parameter in the name of the function.Is can only be boolean.

The point is, that per definition a LongBool (Windows.BOOL) can have any value other than 0 and will be true in that case. This also means that it is not sufficient to check for 1 (as true) and 0 (as false) but rather you should check against 0 (i.e. FALSE) in all cases.

[Razor]

Can you help me with other functions :)

[Olli]

How much do you pay per hour? :mrgreen: :zwinker:

I can try, but my spare time is limited anyway, so I'd prefer you forward only those parts you really can't solve yourself. Please do it via the forum anyway, so other can benefit from the findings.

[Razor]

For me it returns -1 or false but i dont know for accual users that have gigabyte board.So you may test it

Delphi-Quellcode:

interface

uses
  Fastmm4,Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
    const
  w83781ddll = 'w83781d.dll';
type
  TForm1 = class(TForm)
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
    function LX_IsGigaMainBoard : integer;external 'w83781d.dll';
var
  Form1: TForm1;
   hInstdll: THandle;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
hInstdll := LoadLibrary(w83781ddll);
if LX_IsGigaMainBoard=-1 then
label1.caption:='you dont have a giga board!'
else  if   LX_IsGigaMainBoard=0 then
 label1.caption:='you do have a giga board!';
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
FreeLibrary(hInstdll);
end;

end.