quickbms string operations

[finale00]

Two things I want to get:

Length of some string NAME
some substrings of NAME (ie: first 5 characters, last 3 characters, etc)

Is this possible? How to accomplish?

[chrrox]

read the help file included in quickbms?
just look up
String VAR OP VAR

[finale00]

How can I combine the operations to determine if a substring is part of a string?

ie: determining whether the "." character is in some string, and possibly the index.

[AlphaTwentyThree]

If it's only one character, you can just scan through the string:

Code: Select all

set NAME "TEST.bmp"
set DETECT 0x2e # needs to be the hex representation
callfunction searchstring 1

startfunction searchstring 
   strlen NAMEL NAME
   set EXISTS 0
   for i = 0 < NAMEL
      getVarChr T NAME i
      if T == DETECT
         set EXISTS 1
         break
      endif
   next i
endfunction

You'll also get the position of the character with this (variable i). It's a bit tricky to work with strings with QuickBMS.
Do you really need to check for a string of length more than one? What exactkly do you want to do? Your example with the "." reminds me of "splitting file name and extension if there is one".

[aluigi]

in your example of the dot if you want to know directly the extension of a filename located in a variable (like set VAR string "myfile.txt") you can just use:
set EXT extension VARIABLE

the String command can be used to do search operations but sometimes it's a bit complex and in some cases I'm still undecided on the return value.
for example if you want something like strchr you can just use the '&' operator or just "strchr" (it's the same since it's an alias):

set NAME string "myfile.txt"
set TMP string NAME
string TMP &= "."

in this case TMP will be ".txt"
you can do all the tests you want just like I did simply writing these example scripts and then placing a print command at the end, like:
print "result: %TMP%"