qt 如何调用c函数

many opensource code is in c code format for most wide use. qt uses c++.so use c function is the same as common C++ and C program.c functions and var to be called by c++ should be in a header file:

//cHeader.h

#ifdef __cplusplus

extern "C" {

#endif

void cFuncCalledByCPlus();extern int cVar;

#ifdef __cplusplus

}

#endif

in Cplus code, include "cHeader.h" and use functions and variables from c. So simple.