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SEND DATA ON SERIAL PORT Overview Serial communications in Microsoft® Win32® is significantly different from serial communications in 16-bit Microsoft Windows®. Those familiar with 16-bit serial communications functions will have to relearn many pa rts of the system to program serial communications properly. This article will help to accomplish this. Those unfamiliar with serial communications will find this article a helpful foundation for development efforts. This article assumes you are familiar with the fundamentals of multiple threading an d synchronization in Win32. In addition, a basic familiarity of the Win32 heap functions is useful to fully comprehend the memory management methods used by the sample, MTTTY, included with this article. For more information regarding these functions, consult the Platform SDK documentation, the Microsoft Win32 SDK Knowledge Base, or the Microsoft Developer Network Library. Application programming interfaces (APIs) that control user interface features of windows and dialog boxes, though not discussed here, are useful to know in order to fully comprehend the sample provided with this article. Readers unfamiliar with general Windows programming practices should learn some of the fundamentals of general Windows programming before taking on serial communications. In other words, get your feet wet before diving in head first. (36 printed pages) Introduction The focus of this article is on ap plication programming interfaces (APIs) and methods that are compatible with Microsoft Windows NT and Windows 95; therefore, APIs supported on both platforms are the only ones discussed. Windows 95 supports the Win32 Telephony API (TAPI) and Windows NT 3.x do es not; therefore, this discussion will not include TAPI. TAPI does deserve mention, however, in that it very nicely implements modem interfacing and call controlling. A production application that works with modems and makes telephone calls should implement these features using the TAPI interface. This will allow seamless integration with the other TAPI-enabled applications that a user may have. Furthermore, this article does not discuss some of the configuration functions in Win32, such as GetCommProperties. The sample included with this article, MTTTY: Multithreaded TTY (4918.exe), implements many of the features discussed here. It uses three threads in its implementation: a user interface thread that does memory manage ment, a writer thread that controls all writing, and a reader/status thread that reads data and handles status changes on the po rt. The sample employs a few different data heap s for memory management. It also makes extensive use of synchronization methods to facilitate communication between threads. Opening a Port The CreateFile function opens a communications port. There are two ways to call

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