What are SetupAPI,SetupAPI1,and SetupAPI2? And what the difference between them?

Question

Recently，I need to realize a little function in MFC by C++ which is used to get a list of available serial ports. And then I saw this. I need to know what is SetupAPI1 and SetupAPI2? Where can I get the setup.dll when I wanna use this way to realize my function?. During searching the Internet I found there is a SetupAPI but it seems another one. Now, I am really confusing by these SetupAPI, SetupAPI1, and SetupAPI2. What are the differences? Where are they come from? And, how can I get them if I wanna to use these?

Answer 1

There is no such think as SetupAPI1 and SetupAPI2. There is a library named SetupAPI.

This answer you link to refers to a library named EnumSerialPort. From that page:

Internally the code provides 9 different ways (yes you read that right: Nine) of enumerating serial ports: Using CreateFile, QueryDosDevice, GetDefaultCommConfig, two ways using the Setup API, EnumPorts, WMI, Com Database & enumerating the values under the registry key HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM.

...

All of the configuration of the code is controlled by the following preprocessor values: CENUMERATESERIAL_USE_STL, _AFX, NO_ENUMSERIAL_USING_CREATEFILE, NO_ENUMSERIAL_USING_QUERYDOSDEVICE, NO_ENUMSERIAL_USING_GETDEFAULTCOMMCONFIG, NO_ENUMSERIAL_USING_SETUPAPI1, NO_ENUMSERIAL_USING_SETUPAPI2, NO_ENUMSERIAL_USING_ENUMPORTS, NO_ENUMSERIAL_USING_WMI, NO_ENUMSERIAL_USING_COMDB & NO_ENUMSERIAL_USING_REGISTRY.

This library presents two different methods that rely on SetupAPI, and simply numbers them one and two. You can see these details and more by following the links.