The comm device class consists of communications ports. You access these
devices by using the Win32 file and communications functions.
functions fill a VARSTRING
structure, setting the dwStringFormat
member to the STRINGFORMAT_ASCII value and appending a null-terminated string
that specifies the name of the communication port (such as COM1). You use this
port name in a call to the CreateFile
function to open the communication device for the line or phone.
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