External Interfaces Reference |
Get number of fields in structure mxArray
C Syntax
Arguments
array_ptr
Pointer to a structure mxArray
.
Returns
The number of fields, on success. Returns 0 on failure. The most common cause of failure is that array_ptr
is not a structure mxArray
. Call mxIsStruct
to determine if array_ptr
is a structure.
Description
Call mxGetNumberOfFields
to determine how many fields are in the specified structure mxArray
.
Once you know the number of fields in a structure, it is easy to loop through every field in order to set or to get field values.
Examples
See phonebook.c
in the refbook
subdirectory of the examples
directory.
For additional examples, see mxisclass.c
in the mx
subdirectory of the examples
directory; see explore.c
in the mex
subdirectory of the examples
directory.
See Also
mxGetField
, mxIsStruct
, mxSetField
mxGetNumberOfElements | mxGetNzmax |
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