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➜ SMAUG
➜ SMAUG coding
➜ accessing members of a structure
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accessing members of a structure
|
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| Posted by
| Gohan_TheDragonball
USA (183 posts) Bio
|
| Date
| Thu 06 Dec 2007 12:20 PM (UTC) |
| Message
| i was wondering if something like this is possible (pseudo code for example)
char arg[MAX_STRING_LENGTH];
argument = one_argument(argument, arg);
if ( is_struct_member(ch,arg) )
{
ch->(arg) = argument;
}
else
{
prog_bug( "Accessing invalid member of character structure.", mob );
}
what i am trying to find out is if i can code in a way to directly manipulate/access members of any given structure, whether it be character/mobile/object/room, based on a given string. any ideas or suggestions or links would be very appreciated. | | Top |
|
| Posted by
| ThomasWatts
USA (66 posts) Bio
|
| Date
| Reply #1 on Thu 06 Dec 2007 02:51 PM (UTC) |
| Message
| | What you want to do is not possible in C that I know of. What you want instead is a lookup table. | | Top |
|
| Posted by
| Gohan_TheDragonball
USA (183 posts) Bio
|
| Date
| Reply #2 on Thu 06 Dec 2007 03:19 PM (UTC) |
| Message
| | well i already know of what i will do if this is not possible, but that requires programming in every variable possiblity for each structure, and would have to update in future variables as they were added, i was hoping for a more dynamic structure. | | Top |
|
| Posted by
| David Haley
USA (3,881 posts) Bio
|
| Date
| Reply #3 on Thu 06 Dec 2007 08:56 PM (UTC) |
| Message
| There is simply no way to access the members of a structure at runtime without adding code to do it yourself. C simply does not provide that kind of mechanism. And yes, if you do it with a straightforward table, you will need to update it every time you add a fixed field.
If this is an important thing for you, you should consider making your entire structure dynamic, as Thomas suggested. Instead of having a struct with fixed fields, you can have a struct with a single lookup table mapping field name to field value. Of course, this is a whole lot easier in C++ than in C ... and it's worth mentioning that it's also a whole lot easier in Lua than in C++. |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | | Top |
|
| Posted by
| Gohan_TheDragonball
USA (183 posts) Bio
|
| Date
| Reply #4 on Fri 07 Dec 2007 01:19 PM (UTC) |
| Message
| | its fine i will just do it the way i am doing it right now, just more to type. its not that important, just would have been cool to implement, both for the script system but also just for the xp of doing it. as for lua, that is a nice scripting system, but what is the point of it, i never checked it out in depth, how does a builder modify a script in-game? | | Top |
|
| Posted by
| David Haley
USA (3,881 posts) Bio
|
| Date
| Reply #5 on Fri 07 Dec 2007 03:58 PM (UTC) |
| Message
| In this case you wouldn't be using Lua just to do builder scripts anymore, you would be using Lua to implement parts of the game itself. For an example, see Nick's quest system in Lua; note that player questing data is stored in Lua data structures, not C.
Still, if you were using Lua for mudprogs, editing them would work the same way as current editing does. Just pull up the text into a buffer and edit it. :-) |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | | Top |
|
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