|November 21, 2009, 12:03||
global variable in udf
Join Date: Aug 2009
Posts: 35Rep Power: 9
i am writing a DEFINE_SOURCE, how can i define a global variable in udf whose value doesn't reset by the repetition of the udf for each cell in the zone.
|November 21, 2009, 15:16||
Join Date: Nov 2009
Posts: 122Rep Power: 9
when you need a global variable you have to define that variable OUTSIDE of any single function, so the variable is visible to all functions within a UDF source file .I past to you a text that you can find in UDF guide.
Global variables are variables that are defined outside of any single function and are
visible to all function(s) within a UDF source file. Global variables can also be used
by other functions outside of the source file unless they are declared as static (see
Section A.5.3: Static Variables). Global variables are typically declared at the beginning
of a file, after preprocessor directives as in
real volume; /* real variable named volume is declared globally */
/* code that computes volume of some zone */
volume = ....
Otherwise, If you have a global variable that is declared in one source code file, but a function in another source file needs to use it, then it must be defined in the other source file as an EXTERNAL variable.
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