Confused on how to use #include

Forum 2005-2010 (read only) Software Syntax & Programs
1

I have got a library on the forum to do RTC.
There are 2 files:
DS1307.h

/* 
   DS1307.h - library for DS1307 rtc 
   Created by matt.joyce@gmail.com, December, 2007. 
   Released into the public domain. 
*/ 
  
// ensure this library description is only included once 
#ifndef DS1307_h 
#define DS1307_h 
  
// include types & constants of Wiring core API 
#include <WConstants.h> 
  
// include types & constants of Wire ic2 lib 
#include <Wire.h>
... ... (just definition)

DS1307.cpp:

/* 
   DS1307.cpp - library for DS1307 rtc 
   Created by matt.joyce@gmail.com, December, 2007. 
   Released into the public domain. 
 */ 
  
#include "DS1307.h" 
#include <WProgram.h>  
#include <Wire.h>
... ... (this .cpp uses wire functions)

My main code:

#include <DS1307.h>
#include <LiquidCrystal.h>
... ...(more code)

When I tried to compile, I get error

C:\Program Files\arduino-0018\libraries\DS1307\/DS1307.h:15:19: error: Wire.h: No such file or directory

                 from C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:8:

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected unqualified-id before 'int'

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected `)' before 'int'

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected `)' before 'int'

                 from C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:8:

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected unqualified-id before 'double'

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected `)' before 'double'

c:/program files/arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected `)' before 'double'

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In constructor 'DS1307::DS1307()':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:12: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'void DS1307::read_rtc()':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:25: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'void DS1307::save_rtc()':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:41: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'void DS1307::get_sram_data(byte*)':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:172: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'void DS1307::set_sram_data(byte*)':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:186: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'byte DS1307::get_sram_byte(int)':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:199: error: 'Wire' was not declared in this scope

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp: In member function 'void DS1307::set_sram_byte(byte, int)':

C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:209: error: 'Wire' was not declared in this scope

Any help is appreciated. I've never had an include problem but this wire.h thing is driving me nuts. Thanks.

2

Try adding Wire.h to the sketch, too.

3

Try:
#include <Wire.h>
before:
#include <DS1307.h>

Which version of the IDE are you uing?

Gordon

4

Added the wire.h file and swapped the include commands. No go.
I then added #include "wire.h" in my main sketch and no go.

If you want to refer to a .h file in your libraries, you use <Wire.h>, right?

If you want to refer to a .h file elsewhere, you use "../Wire/Wire.h", right?

5

The ../Wire/Wire.h construct would look for a file called Wire.h in a directory called Wire in the parent directory of the current directory. It probably is not what you want to use.

There are two formats for the include statement:
#include <Wire.h>
#include "Wire.h"

The "" version uses explicit paths, relative to the sketch directory. The <> uses both explicit and implicit paths. The implicit paths include the Arduino directories and the AVR directories.

In the IDE, can you import the Wire library, using Sketch + Import Library?

6

I think the compiler is telling you the Wire library is not in your libraries folder.

C:\Program Files\arduino-0018\libraries\DS1307\/DS1307.h:15:19: error: Wire.h: No such file or directory

                 from C:\Program Files\arduino-0018\libraries\DS1307\DS1307.cpp:8: