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 TVCOM 1.0 - Using Async Professional with TVision  Terry Hughes 06.12.1992

Объектно-ориентированная коммуникационная программа для BP7, демонстрирующая совместную работу TurboVision и коммуникационного пакета Async Professional.
TVCOM - a program that demonstrates one way of using Async Professional within a Turbo Vision program.



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This program provides a TTerminalWindow object derived from TWindow. The interior of this object is derived TTerminal. Such an object offers a handy way of adding text to the end of a scroller and navigating (using cursor keys or mouse) around the scroller. We also derive a new application object from TApplication called TComApp. The actual application, TMyApp is then derived from TComApp. In your programs, you might want to consolidate TComApp and TMyApp into one object. We broke it into two objects in case you wanted to move TComApp and TTerminalWindow objects into their own units. Serial port output is handled by TTerminalWindow's interior. Whenever it receives a evKeyDown message it sends that character to the serial port with PutChar. Serial port input is handled by TComApp's Idle method. Each time that method is called (which is once for every generated message) it checks the com port for characters waiting in the input buffer. If it finds that a character is ready, it will retreive that character, format an event record with a custom event code of evComChar and passes that event directly to the TTerminalWindow's HandleEvent method. It will process up to 10 characters each time Idle is called (speeding things up a bit whenever a large block of characters arrives at the serial port). TTerminalWindow's TInterior is the object that actually processes the evComChar event. To do so, it calls TTerminal's CharWrite method to add that character to the end of the scroller buffer and display it. Note this is a rather "bare bones" implementation. The TTerminal ancestor of TTerminalWindow's interior doesn't have the necessary methods to easily add terminal emulation (which would need to modify colors, position the cursor anywhere within the scroller buffer, etc.). To add emulation, you'll either need to add methods to TTerminalWindow's interior, or perhaps, choose a different ancestor than Turbo Vision's TTerminal. Additionally, this example gives little consideration to performance. You may want to consider processing characters in blocks rather than generating an event for each character. That is, the TComApp Idle method would collect a block of input characters, place a pointer to that block in the event record's InfoPtr field, and have the TTerminalWindow's HandleEvent method process that entire block at once. Released to the public domain Written by Terry Hughes, TurboPower Software Version 1.0 - 6-10-91 initial release 1.01 - 8-24-92 : wasn't releasing comport memory when terminal window closed 1.02 - 12-5-92 : updated for BP7