how can I use graphical function in chart at C action language？

this is the stateflow ，i want use graphical function in OFF status，use exteral function in ON status（i set extern C file in configration is ok）。when i use this stateflow make code generation。when i use chart action language MATLAB ，and comment 2 ie.% H=changeH(EXData.h).it ok. but not comment，following errors is occuring.

for use extern function, I search one method ：use chart action language C. but in this action language ，not identify graphical function.How how can I use graphical function in chart at C action language？or other solve method?

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i can call no hanve parameter，like following:

but not can call have parameter. use aboce chart can generated code no error or warning

Answer 1

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I solved this issue. EXData.H data type is default double,but my externfunction is int.....