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Tech Tip: Displaying a thermometer in a separate window
PRODUCT: 4D | VERSION: 6.5 | PLATFORM: Mac & Win
Published On: August 24, 2001
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When performing a lengthy operation (e.g. looping through a selection of records) you may want to display a thermometer or another type of progress indicator. This makes for more patient users.

The principle for this is simple: the thermometer is located on a separate form and its variable name is an interprocess variable. The calling process (the one that is actually performing the task) will create a new process that uses that form and will periodically update the thermometer via the interprocess variable.

The code running in the calling process could be as follows:

$proc:=New process("Launch_Thermo";32*1024)
For ($i;1;5000)
 &Mac215;Thermo:=($i/5000)*100
 CALL PROCESS(-1)
  CREATE RECORD([Table 1])
 [Table 1]Field1:=String($i)
 SAVE RECORD([Table 1])
End for
CALL PROCESS($proc)

The process created will use the Launch_Thermo method which consists of the following (where form1 is the thermometer's form):

$Winref:=Open form window([Dialog];"Form1")
DIALOG([Dialog];"Form1")

From there, the only missing code is the code responsible for closing the thermometer window. You will surely notice the call to the thermometer process (CALL PROCESS($proc)). When combined with the following code in the form method of form 1, the outside call will close the thermometer window.

Case of
: (Form event=On Outside Call )
 If (&Mac215;thermo=100)
   CANCEL
 End if
End case