I have some confusion about the defintions , header files, how to make them can I make  them just by saving them on a C++ compiler ,  is an Application program interface API a way to have serial port communication really I am confused plz help

You can make a header file in notepad if you want and save it as whatever.h
Probably you have header files that provide the function defintions for serial port communication.  

bkeith
Coastal Instruments
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bkeith
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johnwm
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First, let us know which compiler you are using. Bet to give you some idea:

- Most compilers come with standard libraries that make it very easy to configure and use serial communication.
- The APIs are declared in corresponding header files.
- If you have to use a specific API, you 'include' the corresponding header file in your .c or .cpp file and then use these functions to open, configure, read from/write to, and close the serial port. (a common example: to use console IO including keyboard inputs, I would include conio.h and while compiling, see that that the library path for compilation includes the standard library libc.lib)

Hence, more information is required to give specific suggestions.

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