Saving current directory to text file

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Traxler

Joined: 30 Oct 2014
Posts: 12

Traxler 30 Oct 2014, 18:26

Hello 'world'

buffer db ?
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer

how do I declare variables so that the current directory can be copied to text file with WriteFile ?
if someone had a small example.

thank you for your help

30 Oct 2014, 18:26

shutdownall

Joined: 02 Apr 2010
Posts: 517
Location: Munich

shutdownall 30 Oct 2014, 20:30

Regarding this

Code:

DWORD WINAPI GetCurrentDirectory(
  _In_   DWORD nBufferLength,
  _Out_  LPTSTR lpBuffer
);

you can code it like this:

Code:

buffer db 200h dup(0)
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer

30 Oct 2014, 20:30

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 31 Oct 2014, 02:24

Code:


invoke GetCurrentDirectoryA, PATH_LENGTH, pszBuffer
invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
invoke lstrlenA,  pszBuffer
invoke WriteFile, [hFile], pszBuffer, eax, dwWritten, 0
invoke CloseHandle, [hFile]

31 Oct 2014, 02:24

Traxler

Joined: 30 Oct 2014
Posts: 12

Traxler 31 Oct 2014, 09:19

buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

Laughing

shutdownall wrote:

Regarding this

Code:

DWORD WINAPI GetCurrentDirectory(
  _In_   DWORD nBufferLength,
  _Out_  LPTSTR lpBuffer
);

you can code it like this:

Code:

buffer db 200h dup(0)
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer

31 Oct 2014, 09:19

Picnic

Joined: 05 May 2007
Posts: 1397
Location: Piraeus, Greece

Picnic 01 Nov 2014, 15:12

typedef wrote:

Code:


invoke GetCurrentDirectoryA, PATH_LENGTH, pszBuffer
invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
invoke lstrlenA,  pszBuffer
invoke WriteFile, [hFile], pszBuffer, eax, dwWritten, 0
invoke CloseHandle, [hFile]

Mind the handle Wink

Code:

invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
mov [hFile], eax

01 Nov 2014, 15:12

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 01 Nov 2014, 20:43

Yeah. I left out a lot assuming that they know how to weave that code together.

01 Nov 2014, 20:43

shutdownall

Joined: 02 Apr 2010
Posts: 517
Location: Munich

shutdownall 02 Nov 2014, 13:55

Traxler wrote:

buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

Just in case, the 200 means the size of the buffer.
So for bigger directories you may choose more buffer (1000h = 4096 bytes) and to be more general it would be good to allocate memory dynamically. But this maybe too much for a hello world project. Wink

02 Nov 2014, 13:55

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 02 Nov 2014, 15:44

shutdownall,

Dynamic allocation is good when data is really dynamic.

02 Nov 2014, 15:44

TheRaven

Joined: 22 Apr 2008
Posts: 91
Location: U.S.A.

TheRaven 15 Jan 2015, 13:37

Traxler wrote:

buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

you can code it like this:

Buffer sizes are explicit with Windows and a ? in best case scenario will result in a buffer of zero length. By general convention, text file buffers are 1024 or a megabyte.

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15 Jan 2015, 13:37

macgub

Joined: 11 Jan 2006
Posts: 350
Location: Poland

macgub 16 Jan 2015, 11:16

Hi. I have similar problem. I have something write to file. But there are some problems with file handler. File appears only if I leave program and ex. change current directory Who help me fix my code Question

Code:

;--code

    invoke  GetStdHandle, STD_OUTPUT_HANDLE
    mov  [file_handle],eax
    invoke  CreateFile,file_name, GENERIC_WRITE, 0, 0,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
    invoke  WriteFile,eax,file_buffer,[file_size], byteswritten, 0
    invoke  CloseHandle,[file_handle]

;--data
  file_handle dd ?
  file buffer rb 65536                                        
  bytes_written dd ?

16 Jan 2015, 11:16

AsmGuru62

Joined: 28 Jan 2004
Posts: 1657
Location: Toronto, Canada

AsmGuru62 16 Jan 2015, 16:33

Not sure what do you want to do with the code.
When you close the handle - you're closing the handle returned by GetStdHandle(), not the one returned by CreateFile().
Also, [file_size] and [file_name] are not declared.

16 Jan 2015, 16:33

macgub

Joined: 11 Jan 2006
Posts: 350
Location: Poland

macgub 16 Jan 2015, 16:47

Now the code is:

Code:

;---code
  invoke  CreateFile,file_name, GENERIC_WRITE, 0, 0,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
    mov  [file_handle],eax
    invoke  WriteFile,eax,file_buffer,[file_size], byteswritten, 0
    invoke  CloseHandle,[file_handle]  ]    
    
;--data
   file_handle dd ? 
  file buffer rb 65536                                         
  bytes_written dd ?     
 file_name    db 'surface.3ds',0 
file_size dd 1024

And all works as I want. Thanks AsmGuru62 for the tip.

[/b]

16 Jan 2015, 16:47

bitshifter

Joined: 04 Dec 2007
Posts: 796
Location: Massachusetts, USA

bitshifter 17 Jan 2015, 05:41

my win32 version, was bored...

Code:

format PE GUI 4.0
entry start

include 'win32axp.inc'

section '.text' code readable executable

 start:
        invoke GetCurrentDirectoryA,0,0
        mov [dwLength],eax

        invoke LocalAlloc,LPTR,[dwLength]
        mov [pszBuffer],eax

        invoke GetCurrentDirectoryA,[dwLength],[pszBuffer]

        invoke  CreateFileA,pszFileName,GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0
        mov [hOutputFile],eax

        mov eax,[dwLength]
        sub eax,sizeof.TCHAR
        invoke WriteFile,[hOutputFile],[pszBuffer],eax,dwBytesWritten,0

        invoke CloseHandle,[hOutputFile]

        invoke LocalFree,[pszBuffer]

        invoke ExitProcess,0

section '.data' data readable writeable

 pszFileName db 'spit.txt',0
 hOutputFile dd INVALID_HANDLE_VALUE
 dwBytesWritten dd ?
 pszBuffer dd ?
 dwLength dd ?

section '.idata' import data readable

 library kernel32,'KERNEL32.DLL',\
         user32,'USER32.DLL'

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

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17 Jan 2015, 05:41

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