strindexk
Prev | Orchestra Opcodes and Operators | Next

## strindexk

strindexk — Return the position of the first occurence of a string in another string

## Description

Return the position of the first occurence of S2 in S1, or -1 if not found. If S2 is empty, 0 is returned. strindexk runs both at init and performance time.

## Syntax

    kpos strindexk S1, S2

## Examples

Here is an example of the strindexk opcode. It uses the file strindexk.csd.

Example 818. Example of the strindexk opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac     ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o strindexk.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    seed 0

    instr 1
    ;get one element of the input string whenever the metro
    ;triggers, and call a subinstrument to play the file

    Smember   strget    p4
    istrlen   strlen    Smember
    kprint    init      0
    ktrig     metro     .5

     ;whenever the trigger gives signal
     if ktrig == 1 then
      ;choose a random element (0, 1 or 2)
    kel       random    0, 2.9999
    kel       =         int(kel)
     ;make a copy for leaving Smember intact
    Scopy     strcpyk   Smember
     ;set the initial index for reading substrings
    kndx      =         0
     ;set counter for searching the element
    kcount    =         0
     ;start looping over the elements in Smember
    loop:
    kdelim    strindexk Scopy, ":"
      ;as long as ":" occurs in Scopy, do:
      if kdelim > 0 then
       ;if this is the element to get
       if kel == kcount then
        ;read it as substring
    Sfile     strsubk   Scopy, kndx, kdelim
    kprint = kprint+1
        ;and jump out
              kgoto     call
       ;if not
       else
        ;cut off this element from Scopy
    Scopy     strsubk   Scopy, kdelim+1, istrlen
       endif
       ;if no element has been found,go back to loop
       ;and look for the next element
    kcount    =         kcount+1
              kgoto     loop
      ;if there is no delimiter left, the rest is the searched element
      else
    Sfile     strcpyk   Scopy
      endif
    call:
     ;print the result, call the subinstrument and play the file
              printf    "kel = %d, file = '%s'\n", ktrig+kprint, kel, Sfile
    S_call    sprintfk  {{i 2 0 1 "%s"}}, Sfile
              scoreline S_call, ktrig
     endif

    endin

    instr 2 ;play
    Sfile     strget    p4
    ilen      filelen   Sfile
    p3        =         ilen
    asig      soundin   Sfile
              outs      asig, asig
    endin
    </CsInstruments>
    <CsScore>

    i 1 0 30 "mary.wav:fox.wav:beats.wav"
    e
    </CsScore>
    </CsoundSynthesizer>

## See also

strindex

## Credits

Author: Istvan Varga
2006

New in version 5.02

Prev | Up | Next
strindex | Home | strlen