X11 development

Hello

Check this code

Code:

#include        <stdio.h>
#include        <X11/Xlib.h>
#include        <X11/Xutil.h>

Display * mydisplay;
Window mywindow;
GC mygc;
XEvent myevent;
KeySym mykey;
XSizeHints myhint;
int     myscreen;
unsigned long   myforeground,
                mybackground;
XFontStruct * font_struct;

/* declarations */
char    window_title[] = {"Hello World"};

main (argc, argv)
int     argc;
char  **argv;
{
    int     i;
    char    text[10];
    int     done;
 XColor  greencolor;
 XColor  rgb;

    mydisplay = XOpenDisplay ("");
    myscreen = DefaultScreen (mydisplay);

    /* default pixel values */
    mybackground = WhitePixel (mydisplay, myscreen);
    myforeground = BlackPixel (mydisplay, myscreen);

    /* default program-specified window position and size */
    myhint.x = 10;
    myhint.y = 10;
    myhint.width = 250;
    myhint.height = 150;
    myhint.flags = PPosition | PSize;

    /* window creation */
    mywindow = XCreateSimpleWindow (mydisplay,
     DefaultRootWindow (mydisplay),
     myhint.x, myhint.y, myhint.width,
 myhint.height,
     5, myforeground, mybackground);
    XSetStandardProperties (mydisplay, mywindow, window_title, window_title, 
None, argv, argc, &myhint);

    /* GC creation and initialization */
    mygc = XCreateGC (mydisplay, mywindow, 0, 0);
    XSetBackground (mydisplay, mygc, mybackground);
    XSetForeground (mydisplay, mygc, myforeground);
    XAllocNamedColor(mydisplay, DefaultColormap(mydisplay, myscreen),
   "MediumForestGreen", &greencolor, &rgb);

    /* font initialization */
    font_struct = XLoadQueryFont (mydisplay, "*courier-bold-r-normal--14*");
    XSetFont (mydisplay, mygc, font_struct -> fid);

    /* input event selection */
    XSelectInput (mydisplay, mywindow,
     ButtonPressMask | KeyPressMask | ExposureMask);

    /* window mapping */
    XMapRaised (mydisplay, mywindow);
    XFlush (mydisplay);

    /* main event-reading loop */
    done = 0;
    while (done == 0) {

 /* read the next event */
 XNextEvent (mydisplay, &myevent);
 switch (myevent.type) {

 /* repaint window on expose events */
     case Expose: 
 XSetForeground(mydisplay, mygc, myforeground);
 XDrawString (mydisplay, mywindow, mygc, 10, 60, "Hello, World", 12);
 XDrawRectangle(mydisplay, mywindow, mygc, 5, 47, 150, 15);
 if (myevent.xexpose.count == 0)
 XFlush (mydisplay);
 break;

 /* process mouse-button presses */
     case ButtonPress: 
 done = 1;
 break;

 /* process keyboard input */
     case KeyPress: 
 i = XLookupString (&myevent, text, 10, &mykey, 0);
 if (i == 1 && text[0] == "q")
 done = 1;
 break;

     default: 
 break;

 } /* switch (myevent.type) */
    }   /* while (done == 0) */

    /* termination */
    XFreeGC (mydisplay, mygc);
    XDestroyWindow (mydisplay, mywindow);
    XCloseDisplay (mydisplay);
    exit(0);
}

When I run this program I get the error: ZeroLink: unknown symbol '_XOpenDisplay'

I think that there is a library missing. Any Unix developers out there who can help me?

 

Thank you for the reply,

But now I've got another error:

/usr/bin/ld: Undefined symbols:
_XAllocNamedColor
_XCloseDisplay
_XCreateGC
_XCreateSimpleWindow
_XDestroyWindow
_XDrawRectangle
_XDrawString
_XFlush
_XFreeGC
_XLoadQueryFont
_XLookupString
_XMapRaised
_XNextEvent
_XOpenDisplay
_XSelectInput
_XSetBackground
_XSetFont
_XSetForeground
_XSetStandardProperties
collect2: ld returned 1 exit status

Do you know how to solv that?

 

btw I'am using Mac OS X 10.4