The GetCommModemStatus function is useful when you are using the WaitCommEvent function to monitor the CTS, RLSD, DSR, or ring indicator signals. To detect when these signals change state, use WaitCommEvent and then use GetCommModemStatus to determine the state after a change occurs.
What is the default header file in C?
The default header file that comes with the C compiler is the stdio.h. Including a header file means that using the content of header file in your source program. A straightforward practice while programming in C or C++ programs is that you can keep every macro, global variables, constants, and other function prototypes in the header files.
How to include header file in C/C++ program?
Include your header file with “#include” in your C/C++ program as shown below: Below are some inbuilt header files in C/C++: #include : It is used to perform input and output operations using functions scanf () and printf (). #include : It is used as a stream of Input and Output using cin and cout.
What is the include guard in C++ header?
Typically, header files have an include guard or a #pragma once directive to ensure that they are not inserted multiple times into a single .cpp file. Because a header file might potentially be included by multiple files, it cannot contain definitions that might produce multiple definitions of the same name.
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