Structures

Access to the member of an XPE structure

by name

by position

Performing operations on groups of members of an XPE structure

simple non-optimised access

optimised access

Determining the number of members in a structure

Printing the names and values of all the members in a structure

Creating a new structure

an anonymous structure

a named structure

 

accessing members of an XPE structure

• simple access to the member 'jack' of an XPE structure called 'fred'

  	XPE::VARIABLE
  		member;
  
  	member = XPE::get_variable("fred").get_member("jack");
  

  the contents of the member can now be accessed in a manor similar to any other XPE variable

 
• simple access to the first member of an XPE structure called 'fred'
  (this is access by position and not by name)

  	XPE::VARIABLE
  		member;
  
  	member = XPE::get_variable("fred").get_member(0);
  

  the contents of the member can now be accessed in a manor similar to any other XPE variable

 

 

Performing operations on groups of members of an XPE structure

• simple non-optimised access to an XPE structure called 'fred'

  	int	x1, y1,
  		x2, y2;
  
  
  	x1 = XPE::get_variable("fred").get_member("x1").get_int();
  	y1 = XPE::get_variable("fred").get_member("y1").get_int();
  	x2 = XPE::get_variable("fred").get_member("x2").get_int();
  	y2 = XPE::get_variable("fred").get_member("y2").get_int();
  


 
• optimised access to an XPE structure called 'fred'

  	XPE::STRUCTURE
  		xstruct;
  
  	int	x1, y1,
  		x2, y2;
  
  
  	xstruct = XPE::get_variable("fred").get_struct();
  
  	x1 = xstruct.get_member("x1").get_int();
  	y1 = xstruct.get_member("y1").get_int();
  	x2 = xstruct.get_member("x2").get_int();
  	y2 = xstruct.get_member("y2").get_int();
  

 

determining the number of members in a structure

	int	number_of_members;

	number_of_members = XPE::get_variable("fred").get_struct().get_len();

 

printing the names and values of all the members in a structure

	XPE::STRUCTURE
		xstruct;

	XPE::VARIABLE
		member;

	int	len;

	const char
		*name,
		*xstr;


	xstruct = XPE::get_variable("fred").get_struct();

	len = xstruct.get_len();

	for (int j=0; j<len; j++)
	{
		member = xstruct.get_member(j);

		name = member.get_name();
		xstr = member.get_str();

		printf("%d: '%s' = '%s'\n", j, name, xstr);
	}

 

creating a new structure

• an anonymous structure

  	XPE::STRUCTURE
  		xstruct;
  
  	xstruct.get_member("a") = (long)0;
  	xstruct.get_member("b") = (long)0;
  	xstruct.get_member("c") = (long)0;
  

  
   
• a named structure

  	XPE::get_variable("fred") = XPE::STRUCTURE();
  
  	XPE::get_variable("fred").get_member("a") = (long)0;
  	XPE::get_variable("fred").get_member("b") = (long)0;
  	XPE::get_variable("fred").get_member("c") = (long)0;