Read scalar boolean data from a gateway argument.
int getScalarBoolean(void* _pvCtx, int* _piAddress, int* _piBool)
int getNamedScalarBoolean(void* _pvCtx, const char* _pstName, int* _piBool)
: :_piAddress Address of the Scilab variable. : :_pstName Name of the variable for “named” functions. : :_piBool Return boolean value. :
if successful 0, otherwise print error(s) message(s) in the Scilab console and returns first error number.