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LESSON5B.TXT
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1993-09-19
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CALOOK:
I'm going to use the following piece of the previous
flowchart to illustrate the use of CALOok:
LOGIN PROCESS
┌─────────────────┐ Yes ┌─────────┐
│ Mailer Running? ├───────────────>Send ESC │
└────────┬────────┘ └─────┬───┘
No │<─────────────────────────────┘
Sometimes there will be prompts that might occur, and then
again, might not occur. In cases like this, you can't use {LOOK}
because the script will hang if the LOOKed for text does not come in
from the BBS. For these cases, you need a CONDITIONAL "look".
There are three such "conditional" LOOK statements available in the
{COMMO} macro language -- CALOok, GOLOok, and SSLOok.
Building on previous lessons, let's give our "login"
subroutine its own Macro ID (name)..let's call it "{:LOGIN}
{:LOGIN}
{CALO mprompt,sendesc,Press <ESC> key to continue}
{:MPROMPT}
{LOOK What is your REAL first name?}
This segment adds a conditional check for a mailer's prompt
to press the "Escape" key. If the mailer prompt is received, the
CALOok statement will interrupt regular script processing to execute
the macro I've named "sendesc" ({:SENDESC}). After executing that
macro in response to the "Press Escape" prompt, the script will
return to the point I've specified in the CALOok statement, which in
this case, is "mprompt" ({:MPROMPT}). If the "Press esc" prompt is NOT
received, the script continues on its merry way which, according to
the example is to LOOK for a "first name" prompt. Here's what
{:SENDESC} might look like:
{:SENDESC}
{SEND ^[} (Note the use of "^[" to signify the "escape"
{RETU} character)
Continued in Lesson 5c..
Jim