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Custom Functions

In addition to all the wonderful and powerful calculation functions built into FileMaker Pro 7, you also can create your own custom functions. To create custom functions, you need to have a copy of FileMaker Developer 7. Any custom functions that you create using FileMaker Developer remain in the file and are fully usable when it's subsequently used by the regular FileMaker Pro 7 client application. You just can't edit the formula of the custom function unless you have FileMaker Developer.


As with other “objects,” such as scripts, tables, and user account information, custom functions live “in” a particular file. There is—unfortunately—no way to move or import custom functions defined in one file into another one. The implications of this are obvious: If you have a solution that consists of multiple files, you need to define custom functions redundantly in all the files that need to access them, thus complicating maintenance and troubleshooting. This fact shouldn't scare you off from using custom functions—they're really quite wonderful—but it's certainly a constraint you need to be aware of.


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