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RPG does not have native ways to write to the stream-file part
of the IFS, so you use APIs, as Scott shows.

Just think of APIs as extensions of native languages.

RPG offers data types and structures that map directly to data types and structures in system APIs. So it's relatively strait-forward to write high-level wrappers around system APIs, using RPG. Scott Klement's IFS API's are good examples.

And while you may write high-level wrapper procedures, you may also have occasion to write even higher-level wrappers around lower-level wrappers.

fileCopy() may be a wrapper around fileOpen(), fileRead(), and fileWrite().

dirCopy() may be a wrapper around fileCopy() - to copy the contents of an entire directory.

Then you'll find yourself using your own procedures to write new types of IBM i applications - like the Web based email client I referenced in an earlier post. Starting with basic building blocks such as stream file APIs, then moving more toward full-scale application development.

Nathan.


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