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Greenleaf Software Inc, home of Greenleaf serial communications including protocol analyzers and data compression tools

CommX File Transfer Control Overview

The File Transfer Control

This control integrates with the Port Control and (if desired) the Terminal Control to provide seamless data communications using standard file transfer protocols. In this release of CommX, the protocols supported are ZModem and ASCII file transfers.

  • ZModem includes all the popular options such as sliding window, overwrite options, crash recovery and much more.
  • You can have multiple instances of the File Transfer Control (limited to one per port).

What it Is

The most widely used protocol for RS-232 file transfers is undoubtedly ZModem. Unfortunately, ZModem is not a universally understaood, simple, clean protocol. Implementing ZModem on your own can be a task that would take on nightmare proportions. This is clearly a job for a library component, which is where the Greenleaf CommX File Transfer Control comes into play.

Origin

The CommX File Transfer Control is based on the widely used and proven body of code that has been finely tuned over the years in the best-selling Greenleaf CommLib and Comm++ products. C and C++ programmers have been using this code successfully for years. Placing the code in an ActiveX control makes it even easier to use.

Flexibility

Like the other two controls in CommX, most of the options and features in this control can be set up using either the built-in property pages or programmatically. The persistence of the features makes design time setup a breeze, and makes it easy to modify and save features.

Features you Need

This lists just a few of the many features of the CommX File Transfer Control. Go to the Map, then select File Transfer Interface Details to see how you use it.

  • ZModem send and receive
  • ZModem crash recovery
  • Variable ZModem "sliding window"
  • Selection of receiver overwrite criteria
  • ASCII send and capture
  • Configurable error limits and timeouts
  • Routing of incoming files
  • Recursive engine for multiple file transfers (including wildcards)

Progress...

In addition, the File Transfer Control has a standard progress window that integrates seamlessly with existing programs. The progress window provides valuable feedback that gives end users the assurance that their communications software is really working!

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