#include "Print.h" / Print.cpp support?

1

In my quest to get as many LCD and OLED displays working with the Spark Core as humanly possible, I’ve run into a bit of a roadblock. Normally, Arduino includes a Print Class. This is what makes stuff like Serial.print and Wire.println function. Essentially, you just add : Print to your class constructor with a function for write and boom, you’ve inherited all the functionality of Print. :smiley:

So, my issue here is that #include “Print.h” is throwing a “Not Found” error, so one would assume it’s automatically included, sadly it’s clear my class is in no way extending anything.

So am I going to have to port that as well?! xD

2

I’m porting the brewpi arduino-based fermentation controller to spark - in the code there are several classes that extend Print. Although you don’t have to include “Print.h”, the Print class is already included for you as part of “application.h”.

3

See, that’s what I thought, but it’s not working right for me. Are you extending it the standard way, with a virtual void write function, etc.?

1 Like
4

The signature is

virtual size_t write(uint8_t data);

E.g.

class A : public Print
{
public:
    virtual size_t write(uint8_t)  { return 1; }
};

A a;

Compiles fine.

1 Like
5

Ahh, looks like I missed a couple of size_t entries! It seems the search function is boned in Spark Build. CMD-F doesn’t bring up the search bar, but you can still go through the Find > Find… menu, however it only searches the current visible code and nothing in the scroll buffer. :frowning: