What extra things to do when c based file to add in qt and when we want to add QString class in it ?

[Qt embedded developer]

Actually main problem is i want to use QString in c file .

i have added NFC interface related set of files written in in c in qt. to support nfc interface i have added that. Now i want to use QString class in that file. then how to use it ?

because when i add below code in same file than it give lots of error:
" error: unknown type name 'class' class QString"

My added header file is

#include <QString>

& written code is :

 static char filename[20];
  static int adapter_nr = 2;

  QString status = QString("/dev/i2c-%1").arg(adapter_nr);

[J.Hilk]

then that way is not possible.

You can incorporate c files/code in a c++ project or you can include a c++ library(precompiled) in a c project but you can't s imply include c++ code into a c project.

[jsulm]

@Qt-embedded-developer said in What extra things to do when c based file to add in qt and when we want to add QString class in it ?:

i want to use QString in c file

Then it needs to be C++ file.
What is file extension? .c or .cpp?

[Qt embedded developer]

@jsulm File extension is '.c'

[jsulm]

@Qt-embedded-developer Change to .cpp

[J.Hilk]

then that way is not possible.

You can incorporate c files/code in a c++ project or you can include a c++ library(precompiled) in a c project but you can't s imply include c++ code into a c project.