Developer’s Guide

Understanding external function plug-ins 10-5
7. Type a name for a new calculation field in the Field Name box.
8. For Type, select Calculation, and click Create.
9. In the Specify Calculation dialog box, choose External Functions
from the View pop-up menu.
10. Double-click an external function in the list that begins with the
function prefix "Xpl" to add it to the formula box.
Note The name of the External Function FMExample will show in
bold and the specific functions will be underneath that.
All external function calls require the name of the external function
to call and the function’s parameter value, even if the value is null
( ).
11. Replace the word “parameter” with the required parameter for the
function. If no parameter is required, type two double-quotes ( ).
12. Continue to build the formula as desired and click OK when you’re
done.
13. Click Done to close the Define Fields dialog box.
Customizing the plug-in example
The plug-in example in FileMaker Developer is designed to be easily
modified so you can add your own custom functions. You need to
modify the following:
1 version and function name information in FMExample.r, and
FMExample.rc
1 configuration function in FMPrefs.c
1 registry information in FMMain.h
1 external function definitions in FMFunct.h