Very Long Strings (RB) in fasm?

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Nameless

Joined: 30 Apr 2010
Posts: 95

Nameless 28 May 2010, 06:38

i need to declare a very long string (rb), cause in some cases i need to get the list of all files in a specific directory like \windows\system32 but the variable cant hold this much data

is there anyway to fix this?

Code:

Buffer rb 429496

maybe there is something (like SetLength function in delphi) to increase the string dynamically?

28 May 2010, 06:38

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 28 May 2010, 07:06

Nameless,

Allocate memory dynamically, reallocate if it's not big enough. BTW, Buffer rb 429496 compiles just fine. Probably you've meant Buffer rb 4'294'967'295? Wink

28 May 2010, 07:06

Nameless

Joined: 30 Apr 2010
Posts: 95

Nameless 28 May 2010, 11:12

yea it compiles fine, and works fine too
but when the directory have lots of files it doesn't, either crashing or not showing all files

how can i do that Dynamic Memory Allocation? APIs? functions?

28 May 2010, 11:12

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 28 May 2010, 12:40

VirtualAlloc
HeapAlloc (<=4Mb)

28 May 2010, 12:40

Nameless

Joined: 30 Apr 2010
Posts: 95

Nameless 29 May 2010, 01:52

and the variable declaration is the same?

Code:

Buffer rb 429496

Code:

Buffer db 128 dup(?)

29 May 2010, 01:52

bitshifter

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

bitshifter 29 May 2010, 02:19

They return pointer to memory...

Code:

; I need this much memory
nSize dd 4096

; I am pointer to memory
pBlock dd NULL

; Get pointer to memory
invoke GlobalAlloc,GPTR,[nSize]
mov [pBlock],eax

; Release pointer to memory
invoke GlobalFree,[pBlock]

29 May 2010, 02:19

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 29 May 2010, 07:45

bitshifter,

While using GlobalXxx() is not considered as a deadly sin (on occasions you must use it, e.g. in clipboard operations), better practice is to avoid the unneeded overhead and resource consumption — use HeapXxx() (or VirtualXxx() if you need memory in bulk).

29 May 2010, 07:45

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