how do i do this in FASM

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FrozenKnight

Joined: 24 Jun 2005
Posts: 128

FrozenKnight 26 Jul 2006, 20:18

Code:

tp.Privileges[0].Luid       = luid;

i'm working on creating a tool that lets me kill any process in windows. and a segiment of code i'm translating from msdn had this statement how does this translate in fasm?

26 Jul 2006, 20:18

madmatt

Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA

madmatt 27 Jul 2006, 06:46

could you show the code where this structure is defined?

27 Jul 2006, 06:46

FrozenKnight

Joined: 24 Jun 2005
Posts: 128

FrozenKnight 27 Jul 2006, 07:50

never mind i figured it out

27 Jul 2006, 07:50

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 28 Jul 2006, 08:16

could you help me?

How to translate code like (Delphi)

try
...
finally
...
end;

into FASM?

28 Jul 2006, 08:16

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 28 Jul 2006, 08:31

hardly.

no, really. i am not sure about delphi, but i believe it something with SEH. There was already something about SEH on this forum, so search it, and google for it

28 Jul 2006, 08:31

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 28 Jul 2006, 08:38

Really? I always thought try-finally is just a structural substitute for the error-handling jumps (just to make one more excuse to use GOTO inapplicable). Makes not much sense if you are really into assembly, IMHO.

28 Jul 2006, 08:38

zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 28 Jul 2006, 09:16

yes, TRY is exception handling in delphi. As far as I remember, you can define a block of code to TRY and set exception handling routine with EXCEPT directive. So, if TRY block fails, then EXCEPT block will be executed. FINALLY is executed in all circumstances, and if EXCEPT block wasn't defined, then program will end with error.

28 Jul 2006, 09:16

Mr_Silent

Joined: 25 Apr 2006
Posts: 30

Mr_Silent 28 Jul 2006, 10:44

English:
http://www.microsoft.com/msj/0197/Exception/Exception.aspx
russian:
http://wasm.ru/article.php?article=Win32SEHPietrek1

28 Jul 2006, 10:44

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 28 Jul 2006, 13:00

At least for try-throw-catch-finally combination I don't really see why exceptions would be needed. The throw-catch can be implemented with simple conditional jump.
Of course there is also division by zero, etc. - but usually the exceptions are not really needed to handle errors.

28 Jul 2006, 13:00

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 29 Jul 2006, 09:51

Спасибо!!! Thank you!!

29 Jul 2006, 09:51

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 29 Jul 2006, 15:12

Code:

proc OpenCD drive

        mov     [Flags],MCI_OPEN_TYPE or MCI_OPEN_ELEMENT
        mov     [OpenParm.dwCallback],0
        mov     [OpenParm.lpstrDeviceType],szDeviceType ; = 'CDAudio'
        push    [drive]
        pop     [OpenParm.lpstrElementName]
        invoke  mciSendCommand,0,MCI_OPEN,[Flags],OpenParm
        cmp     eax,0
        jne     .finish
        push    [OpenParm.wDeviceID]
        pop     [DeviceID]
        invoke  mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_OPEN,0
        invoke  mciSendCommand,[DeviceID],MCI_CLOSE,[Flags],OpenParm
  .finish:
        ret
endp

I've read about SEH.. But it's hard to understand. Confused

How to execute last opcode?

Code:

        invoke  mciSendCommand,[DeviceID],MCI_CLOSE,[Flags],OpenParm

Actually, the question is how to execute this code for sure, if the code:
"invoke mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_OPEN,0"
is executed?

Does anybody have an idea or suggestion?

Thank you?

29 Jul 2006, 15:12

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 29 Jul 2006, 15:13

Anyway, thanx..

29 Jul 2006, 15:13

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 29 Jul 2006, 15:22

that code is executed always when "invoke mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_OPEN,0" is executed - because it's just behind it and there is no jump between then

btw:

Quote:

How to execute last opcode?

it's macro call, that is assembled to set of instructions

opcode is numeric representation for one instruction, for example opcode for NOP is 90h

29 Jul 2006, 15:22

okasvi

Joined: 18 Aug 2005
Posts: 382
Location: Finland

okasvi 29 Jul 2006, 16:10

vid wrote:

that code is executed always when "invoke mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_OPEN,0" is executed - because it's just behind it and there is no jump between then

btw:
Quote:
How to execute last opcode?

it's macro call, that is assembled to set of instructions

opcode is numeric representation for one instruction, for example opcode for NOP is 90h

I've always thought it's macro call which is preprocessed to set of instructions which are assembled to binary(opcodes), no? Razz

Might be that I've just read wrong, my english isnt very good Sad

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29 Jul 2006, 16:10

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 29 Jul 2006, 18:46

vid wrote:

that code is executed always when "invoke mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_OPEN,0" is executed - because it's just behind it and there is no jump between then

btw:
Quote:
How to execute last opcode?

it's macro call, that is assembled to set of instructions

opcode is numeric representation for one instruction, for example opcode for NOP is 90h

You didn't understand..

When program sends message to CD/DVD

Code:

        invoke  mciSendCommand,[DeviceID],MCI_SET,MCI_SET_DOOR_CLOSED,0

there might be some problems with a few types of CD/DVD. And i need to give handle back to the Windows, with

Code:

invoke  mciSendCommand,[DeviceID],MCI_CLOSE,[Flags],OpenParm

But due to error in the first statement (the error message appears), the 2nd is not executed. So CD/DVD
becomes locked, and it will be unlocked only after restarting Windows.

29 Jul 2006, 18:46

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 29 Jul 2006, 18:50

And as for macrocall and opcode you are right, but i thought that they are the same.

29 Jul 2006, 18:50

Reverend

Joined: 24 Aug 2004
Posts: 408
Location: Poland

Reverend 29 Jul 2006, 20:46

Win32 API Reference wrote:

mciSendCommand
(...)

Return Values

Returns zero if successful or an error otherwise. The low-order word of the returned doubleword value contains the error return value. If the error is device-specific, the high-order word of the return value is the driver identifier; otherwise, the high-order word is zero. For a list of possible return values, see Constants: MCIERR Return Values.
To retrieve a text description of mciSendCommand return values, pass the return value to the mciGetErrorString function.

Remarks

Error values that are returned when a device is being opened are listed with the MCI_OPEN command message. In addition to the MCI_OPEN error return values, this function can return the values listed in Constants: MCIERR Return Values.[/b]

Just "test eax, eax\ jnz .error" after invoke.

29 Jul 2006, 20:46

Angler

Joined: 28 Jul 2006
Posts: 13

Angler 03 Aug 2006, 10:00

Thank you Reverend i figured out the problem. =)

03 Aug 2006, 10:00

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