How to use strings in esp idf?

Saskia
Posts: 40
Joined: Mon Jun 26, 2017 11:45 am

How to use strings in esp idf?

Postby Saskia » Sun Jul 30, 2017 6:53 am

I want to tuse the datatype STRING. But i can only do this when i include Arduino.h as a header (+ string.h).
Otherwise i get "'String' does not name a type". Is there another way without Arduino.h?

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kolban
Posts: 1447
Joined: Mon Nov 16, 2015 4:43 pm
Location: Texas, USA

Re: How to use strings in esp idf?

Postby kolban » Sun Jul 30, 2017 4:18 pm

These days, I am a big fan of writing ESP32 Apps in C++ as opposed to C. I still use the ESP-IDF (not Arduino libraries).

When writing apps in C++, one has access to all the APIs exposed by newlib and ESP-IDF but in addition, a new treasure chest is opened up called the "C++ Standard Library". This is a rich set of libraries that are present with all conformant C++ implementations and the ESP32 is no exception.

Here is the WikiPedia article:

https://en.wikipedia.org/wiki/C%2B%2B_Standard_Library

and one facet of this is the class called:

std::string

see ... https://en.wikipedia.org/wiki/C%2B%2B_string_handling

and now we have the full power of super rich string handling that "just works".
Free book on ESP32 available here: https://leanpub.com/kolban-ESP32

arnold.braun@gmx.de
Posts: 9
Joined: Wed Dec 20, 2017 9:39 am

Re: How to use strings in esp idf?

Postby arnold.braun@gmx.de » Mon Mar 26, 2018 4:15 pm

Hello,

where can i find the strings.

this don´t work at all:

#include <string.h> or #include "string.h"

class WifiClass {
protected:
public:
string ssid[2]= { "braun","" };

std::string Host = "ESP8266_me";

class WifiClass {
protected:
public:
string ssid[2]= { "braun","" };

std::string Host = "ESP8266_me";

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kolban
Posts: 1447
Joined: Mon Nov 16, 2015 4:43 pm
Location: Texas, USA

Re: How to use strings in esp idf?

Postby kolban » Tue Mar 27, 2018 1:42 am

Howdy,
The header you wish to include is

#include <string>

See also:

https://stackoverflow.com/questions/901 ... -extension
Free book on ESP32 available here: https://leanpub.com/kolban-ESP32

arnold.braun@gmx.de
Posts: 9
Joined: Wed Dec 20, 2017 9:39 am

Re: How to use strings in esp idf?

Postby arnold.braun@gmx.de » Tue Mar 27, 2018 3:18 pm

Thanks

iit works :D

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