> Thank you very much for your help
>
> I did like this ..
> extern "C"
> {
> #include "com.h"
> }
Hmm, that can work, but is not recommended.
The preferred solution is to put conditional guards into the "com.h"
file itself, if you are mixing C and C++ sources together, like this...
Near the top of your file, before any extern functions or variables are
listed, add:
/* Allow C++ Portability */
#ifdef __cplusplus
extern "C" {
#endif
Then at the bottom of your file, add the matching:
/* Allow C++ Portability */
#ifdef __cplusplus
}
#endif
This means that if the header is included by any C++ file, it sees the C
linkage directive, but the added bits are not seen at all by the plain C
code.
(NOTE: All C++ compilers by definition are required to define the
__cplusplus item.)
If you can not modify the "com.h" file for some reason, then make a new
header, say "com_wrapper.h" that simply says...
extern "C"
{
# include "com.h"
}
Then use the "com_wrapper.h" file in your C++ sources...
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