use addr macro

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e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 15:21

hi all. how i can use addr macro? i write next code in proc:

Code:

locals
        ...
        nameBuffer    db 'hello', 0
        ...
endl

invoke  lstrlen, addr nameBuffer

and get error: extra characters on line. instruction: lea edx,[..]ess]

thanks.

26 Sep 2009, 15:21

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20336
Location: In your JS exploiting you and your system

revolution 26 Sep 2009, 15:42

Always show all of your code because faults like this can be caused by other parts of the code.

Check that you have included the 'x' versions of the win functions (win32ax.inc & win32wx.inc):

Code:

include 'win32ax.inc'

26 Sep 2009, 15:42

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 15:47

win32ax included. in my file > 500 lines Smile

i write callback function for work with sqlite :

Code:

proc CallBack c, data, nCols, rows, headers
        locals
                  hostBuffer    rb 45
                  nameBuffer    rb 45
        endl

        mov     ebx, [rows]
        ...

        sub     eax, eax
        ret
endp

and error shows in my first function in this procedure.

26 Sep 2009, 15:47

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 15:48

if i write:

Code:

lea eax, [nameBuffer]
push eax
call [lstrlen]

all works

26 Sep 2009, 15:48

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20336
Location: In your JS exploiting you and your system

revolution 26 Sep 2009, 15:52

We can't help you because you have not included enough code to show the place of the error.

If you don't want to post it all then minimize to the point of just one function or something and strip out lines until just the fault is present. Give us something that we can assemble and see the error. BTW: just doing this part can often show the error to you and you won't need to wait for someone here to help.

26 Sep 2009, 15:52

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 26 Sep 2009, 15:58

This compiles to me:

Code:

include 'win32ax.inc'

proc CallBack c, data, nCols, rows, headers
        locals
                  hostBuffer    rb 45
                  nameBuffer    rb 45
        endl

        invoke  lstrlen, addr nameBuffer

        ret
endp

.end CallBack

So yes, we need more code.

26 Sep 2009, 15:58

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 16:03

i write next small example Smile

Code:

format PE GUI 4.0
entry main

include 'win32ax.inc'

section '.data' data readable writeable
  hello         db 'hello', 0
  hdb           dd ?
  dbName        db 'hehe.sqlite', 0
  sql           db 'SELECT hehe FROM hello', 0

  dumpbuff      rb 1024
  dumpfmt       db 'hehe: %s', 0

section '.code' code readable executable
  main:
        invoke  sqlite3_open, dbName, hdb
        invoke  sqlite3_exec, [hdb], sql, CallBack, 0, 0
        invoke  sqlite3_close, [hdb]
        invoke  ExitProcess, 0

proc CallBack c, data, nCols, rows, headers
        locals
                  hostBuffer    rb 45
        endl

        mov     ebx, [rows]
        invoke  lstrcpy, addr hostBuffer, [ebx]

        sub     eax, eax
        ret
endp

section '.idata' import data readable writeable
  library kernel32, 'kernel32.dll',\
          user32, 'user32.dll',\
          sqlite3, 'sqlite3.dll'

  import sqlite3,\
         sqlite3_open, 'sqlite3_open',\
         sqlite3_exec, 'sqlite3_exec',\
         sqlite3_close, 'sqlite3_close'

  include 'api\kernel32.inc'
  include 'api\user32.inc'

26 Sep 2009, 16:03

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20336
Location: In your JS exploiting you and your system

revolution 26 Sep 2009, 16:08

Are you sure this code generates the same error? I get "error: operand size not specified." because of the the [ebx] parameter. If I remove the [ebx] then it compiles fine.

26 Sep 2009, 16:08

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 16:09

LocoDelAssembly. hmm... this code not compiles Sad

fasm v1.69.04

26 Sep 2009, 16:09

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 26 Sep 2009, 16:09

invoke lstrcpy, addr hostBuffer, [ebx] > invoke lstrcpy, addr hostBuffer, ebx

If rows is pointer to pointer then invoke lstrcpy, addr hostBuffer, dword [ebx]

26 Sep 2009, 16:09

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 26 Sep 2009, 16:14

LocoDelAssembly, yes, rows is pointer to pointer Smile

thanks.

26 Sep 2009, 16:14

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 26 Sep 2009, 16:14

Quote:

LocoDelAssembly. hmm... this code not compiles Sad
fasm v1.69.04

I've used FASMW 1.69.05 and it compiles if it is copied and pasted exactly (and Include in FASMW.INI is set to point to the package includes)

Don't run it however, since the application will surely crash.

26 Sep 2009, 16:14

farrier

Joined: 26 Aug 2004
Posts: 274
Location: North Central Mississippi

farrier 26 Sep 2009, 18:34

e4key,

You should be using the cinvoke instead of invoke to call the sqlite functions, since they are not stdcall functions.

hth,

farrier

_________________
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26 Sep 2009, 18:34

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