isStringType Check if it is a string variable.

## Syntax

    int isStringType(void* _pvCtx, int* _piAddress)

    int isNamedStringType(void* _pvCtx, const char* _pstName)

## Arguments

_pvCtx

  Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h.

_piAddress

  Address of the Scilab variable.

_pstName

  Name of the variable for "named" functions.

## Return value

1 if variable is a string type, otherwise 0