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Author Topic: Eliminate spaces, string.replace() and .trim() not possible?  (Read 895 times)
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NRW
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« on: February 17, 2012, 05:58:04 am »
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Hello good day Arduino communiy!

I allways got an error while compiling with the String- .trim() or .replace() function.

I`ve also tried some example code:
Code:
String stringOne = "<html><head><body>";
Serial.println(stringOne);
String stringTwo = stringOne.replace("<", "</");
Serial.println(stringTwo);


While compiling the sample source (Arduino v1.0) 8. Strings -> StringReplace:

Quote
StringReplace.cpp: In function 'void loop()':
StringReplace:22: error: conversion from 'void' to non-scalar type 'String' requested
StringReplace:28: error: conversion from 'void' to non-scalar type 'String' requested
StringReplace:29: error: no match for 'operator=' in 'leetString = leetString.String::replace('e', '3')'
C:\Users\...\Documents\Arduino\arduino-1.0\hardware\arduino\cores\arduino/WString.h:83: note: candidates are: String& String::operator=(const String&)
C:\Users\...\Documents\Arduino\arduino-1.0\hardware\arduino\cores\arduino/WString.h:84: note:                 String& String::operator=(const char*)

Thanks in advance
Best regards,

Micha
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dxw00d
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« Reply #1 on: February 17, 2012, 06:42:39 am »
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Read the IDE release notes - http://arduino.cc/en/Main/ReleaseNotes

Quote
* The String class has been reimplemented as well, by Paul Stoffregen. This
  new version is more memory-efficient and robust. Some functions which
  previously returned new string instances (e.g. trim() and toUpperCase())
  have been changed to instead modify strings in place.

It would appear that the example sketches haven't been updated.

This version works:
Code:
/*
  String replace()
 
 Examples of how to replace characters or substrings of a string
 
 created 27 July 2010
 by Tom Igoe
 
 http://arduino.cc/en/Tutorial/StringReplace
 
 This example code is in the public domain.
 */

void setup() {
  Serial.begin(9600);
  Serial.println("\n\nString  replace:");
}

void loop() {
  String stringOne = "<html><head><body>";
  Serial.println(stringOne);
  // replace() changes all instances of one substring with another:
  stringOne.replace("<", "</");
  Serial.println(stringOne);

  // you can also use replace() on single characters:
  String normalString = "bookkeeper";
  Serial.println("normal: " + normalString);
  normalString.replace('o', '0');
  normalString.replace('e', '3');
  Serial.println("l33tspeak: " + normalString);

  // do nothing while true:
  while(true);
}
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GoForSmoke
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« Reply #2 on: February 17, 2012, 08:32:14 am »
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Just be aware that String class objects waste RAM which isn't exactly plentiful in Arduino.
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Examples can be found at Learning in the Main Site and at the Playground

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« Reply #3 on: February 17, 2012, 09:32:14 am »
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many thanks for the information!

works fine now  smiley
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