error: 'QRCode' was not declared in this scope

[claytantor]

wondering what I am doing wrong, I am attempting to compile the example in my Arduino UI

https://github.com/ricmoo/QRCode/blob/master/examples/QRCode/QRCode.ino

I have installed the library using the Library Manager...

also check that it is installed...

libraries$ ls -al
total 28
drwxrwxr-x 7 clay clay 4096 Nov 20 22:32 .
drwxrwxr-x 4 clay clay 4096 Nov 20 22:26 ..
drwxrwxr-x 4 clay clay 4096 Nov 20 19:10 Base64
drwxrwxr-x 4 clay clay 4096 Nov 20 19:10 Keypad
drwxrwxr-x 5 clay clay 4096 Nov 20 22:32 QRCode
drwxrwxr-x 9 clay clay 4096 Nov 20 19:10 TFT_eSPI

and when I try to compile the example,

/home/clay/data/github.com/ricmoo/QRCode/examples/QRCode/QRCode.ino: In function 'void setup()':
QRCode:21:5: error: 'QRCode' was not declared in this scope
     QRCode qrcode;
     ^~~~~~
QRCode:22:24: error: 'qrcode_getBufferSize' was not declared in this scope

shouldn't it be able to find QRCode? If it is inappropriate to post this here and its not a bug happy to close and move the conversation.

[claytantor]

so I think I may know what the problem is, QRCode as a directory name instead of all lower case qrcode to match the import may be an issue with my version of the compiler finding the import of qrcode.h.

[elgranshaman]

@claytantor did you find a way to fix this? I am getting the same error

[bluecamel]

The problem for me was that the ESP32 board package also has a qrcode.h. You can get around it by renaming this library's header (and so also the includes in src/qrcode.c and your code).

[AxelHamburch]

Really stupid mistake, but the circumnavigate works, thanks!

[DalbyTech]

Worked for me also, renamed 'qrcode.h' and 'qrcode.c' to 'qrcode_gen.h' and 'qrcode_gen.c', then also tweaked the 'include' line in qrcode.c.

[codewithzahid]

I encountered a similar issue where there was a conflict between the ESP32 board package and a library with the same name. To resolve this, I copied the header files (qrcode.h and qrcode.cpp) directly into my main code and included them using #include "qrcode.h". This approach successfully fixed the problem.