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  VS Arduino › Visual Micro › Visual Studio 2019, 2022, 2026 › VS2015 include same lib twice
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Normal Topic VS2015 include same lib twice (Read 2954 times)
Daniel Oliveira
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VS2015 include same lib twice
Aug 25th, 2016 at 4:06pm
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Hello all,

First of all I would like to thank you for this great project and community Smiley

I have a question regarding library inclusion. I have some experience in C++ but not in Arduino environment.

I would like to know how can I include the same library in both the .ino file and in a class present in a .cpp file plus the header file that is also included in by the .ino fie.

I've tried to include the library.h and the class.h file in the .ino file and then include again the library.h in the class.h and I get the multiple errors like:


Code
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MySensorWrapperBH1750.cpp.o (symbol from plugin)*: In function wakeUp1()
(.text+0x0)*: multiple definition of _wakeUp1Interrupt
MySensorGeneric.cpp.o (symbol from plugin)*: (.text+0x0): first defined here

collect2.exe*: error: ld returned 1 exit status

Error compiling for board Arduino Nano w/ ATmega328


Where MySensorWrapperBH1750 is my class, MySensorGeneric is my .ino file and wakeUp1 is a function of the imported library.


Thank you all in advance
  
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Tim@Visual Micro
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Re: VS2015 include same lib twice
Reply #1 - Aug 25th, 2016 at 4:41pm
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Hi,

Yes you can include twice but make sure headers have a check for "once"

I see many new Arduino library headers have this at the top
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#pragma once


Historically Arduino has always recommended using a define to prevent multiple compilation in .h files
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#ifndef HEADER1_H
#define HEADER1_H

... code ...

#endif // HEADER1_H


« Last Edit: Aug 25th, 2016 at 4:41pm by Tim@Visual Micro »  
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Daniel Oliveira
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Re: VS2015 include same lib twice
Reply #2 - Aug 27th, 2016 at 5:51pm
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Thank you,

That helped and I was able to import it.
  
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