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Programing a modem

Posted on 1998-09-18
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Last Modified: 2012-05-04
How can I program a modem for file transmision and other data (name of directories, changing directories and so on) in Visual C 5++?
What kind of error corection algorithm is used?
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Question by:lucinext
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alexo earned 200 total points
ID: 1173096
You have two possible solutions.

1) Write a Winsock program.  This uses TCP/IP for the transport but can be transparently encapsulated by a serial protocol (PPP) using the dial-up network.

2) Use the serial functions:  Call CreateFile() with a "COMx" argument (x = number of serail port) to open the port, ReadFile() and WriteFile() to receive/send data, etc.  To modify the port and communications parameters use SetCommState(), BuildCommDCB(), SetCommConfig(), etc.  To monitor communication events use SetCommMask() and WaitCommEvent().  Search your online help for "Using the Communications Functions" for some sample code and see the COMM sample application that comes on your C++ CD.
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by:alexo
ID: 1173097
Oh, the error codderction algorithm is usually V.42bis but it is handled transparently by the modem.
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by:alexo
ID: 1173098
Oops, sorry.  V.42bis (or MNP5) is the compression.  V.42 is the error correction.
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by:alexo
ID: 1173099
And the autograder hits again!  Thank you so much for your consideration.
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