cstring datatypes in library function calls dll files

Hi! I'm trying to read data returned by my function: the mprototype is:

% extern " C " int getName( unsigned deviceIndex , char * nameBuffer , unsigned size );

fcns.name{fcnNum}='getName'; fcns.calltype{fcnNum}='cdecl'; fcns.LHS{fcnNum}='int32'; fcns.RHS{fcnNum}={'uint32', 'cstring', 'uint32'};fcnNum=fcnNum+1;

I run the function as:

buf = libpointer('cstring', blanks(200));

nam = calllib('pxc','pxcGetDeviceName',uint32(0),buf,uint32(200));

buf.Value

but all I get is blank string. So my question is: is the libpointer correct fot this usage of function? I'll be thanful for the help. KS

Answer 1

[Philip Borghesani]

Try :

 [retval,name]=calllib('pxc','pxcGetDeviceName',0,blanks(200),200);

It is best to start by letting calllib do the data type conversion for you.