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[.net] Help creating threads

Started by homer_3 Apr 21, 2009 at 5:54 PM 1 reply 750+ views

Original Post

Apr 21, 2009 at 5:54 PM

Ok I don't see what I'm missing. I've been looking and some tutorials and can't seem to create a thread. I have this class for scrolling the map.


class MapScroller
    {
        const int X_INC = 20;
        const int Y_INC = 20;
        int dir = 1;

        public void scrollH(Sprite map, Player player, int len)
        {
            if (len < 0)
                dir = -1;
            else
                dir = 1;
            len = Math.Abs(len);

            for (int i = 0; i < len; i+=X_INC)
            {
                map.position.X += X_INC * dir;
                Thread.Sleep(TimeSpan.FromMilliseconds(500));
            }
        }

        public void scrollV(Sprite map, Player player, int len)
        {
            if (len < 0)
                dir = -1;
            else
                dir = 1;
            len = Math.Abs(len);

            for (int i = 0; i < len; i += Y_INC)
            {
                map.position.Y += Y_INC * dir;
                Thread.Sleep(TimeSpan.FromMilliseconds(500));
            }
        }
    }

Then I try to create a thread from it with


 MapScroller mapScroller = new MapScroller();
 ThreadStart tt = new ThreadStart(mapScroller.scrollH(curMap, player, 800));
 Thread   mapScrollerThread = new Thread(tt);

But mapScroller.scrollH(curMap, player, 800) has an error that says "method name expected". What am I missing?

SiCrane

Mod

473

SiCrane

Apr 21, 2009 at 6:02 PM

mapScroller.scrollH(curMap, player, 800) calls the function right then and there. What you want is a ThreadStart delegate. One way to do that would be:

class ScrollH {  Sprite map;  Player player;  int len;  MapScroller scroller;  ScrollH(Sprite map, Player player, int len, MapScroller scroller) {    this.map = map;    this.player = player;    this.len = len;    this.scroller = scroller;  }  void Execute() {    scroller.scrollH(map, player, len);  }}ThreadStart tt = new ThreadStart(new ScrollH(curMap, player, 800, mapScroller).Execute);

Rynus_Rein

Apr 23, 2009 at 3:07 AM

SiCrane is right, the constructor of Thread requires a ParameterizedThreadStart or ThreadStart delegate (.NET equivalent of function pointers), you may want to read into them: http://en.wikipedia.org/wiki/Delegate_(.NET)

You can do funny stuff with inline delegates:

Thread thread = new Thread(new ThreadStart(delegate {    // do code here}));thread.Start();

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