Read a string from an e.g. exe or dll file

Author: Afrow UK (talk, contrib)

Description

This is a simple script to read a string of a selected length from a byte file.

Usage

Push "500" ;output string length
Push "$TEMP\file.dll" ;file to read from
 Call ReadByteFile
Pop $0 ;output string (StrLen=500)

The Function

Function ReadByteFile
Exch $0 ;file
Exch
Exch $1 ;group-up count
Push $2
Push $3
Push $4
 
 ClearErrors
  FileOpen $0 $0 r
   IfErrors error
 
 StrCpy $2 0
 StrCpy $3 ""
 
loop_read:
 ClearErrors
  FileReadByte $0 $4
   IfErrors exit
  IntFmt $4 "%c" $4
   StrCpy $3 $3$4
  IntOp $2 $2 + 1
   StrCmp $2 $1 exit
Goto loop_read
 
error:
DetailPrint "Error: Input file not found"
 
exit:
  FileClose $0
  StrCpy $0 $3
 
Pop $4
Pop $3
Pop $2
Pop $1
Exch $0 ;output string
FunctionEnd

-Stu (Afrow UK)