3.cpp

unix/linux下面X-Windows的开发示例代码

 #include <stdio.h>
 #include <locale.h>

  	 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>
 #include <X11/Xatom.h>

  	 #define DUMP_ERR    printf

  	 static void draw(Display *display,Window win,XFontSet fontset,GC gc);

  	 int main()
 {
     Display *display;
     int     screennum;
     int     width;
     int     height;
     Atom    protocols;
     int     i;

  	     const char *strdraw = “hello world”;

  	     Window      win;
     GC          gc;
     XFontSet    fontset;

  	     //  set the locale
     const char *curlocale =setlocale(LC_ALL,”");
     if( curlocale == NULL){
         DUMP_ERR(”set locale fail\n”);
         return 1;
     }
     DUMP_ERR(”locale is:%s\n”,curlocale);

  	     if(!XSupportsLocale()){
         DUMP_ERR(”X don’t support current locale\n”);
         return 1;
     }

  	     //  open display for X
     display = XOpenDisplay(NULL);
     if( !display ){
         DUMP_ERR(”call XOpenDisplay(%s) fail\n”,XDisplayName(NULL));
         return 1;
     }

  	     //  get default screen
     screennum       = DefaultScreen(display);
     width   = DisplayWidth(display,screennum)/2;
     height  = DisplayHeight(display,screennum)/2;

  	     //  get the fontset
     {
         char **missing_charset_list_return;
         int  missing_charset_count_return;
         char *def_string_return;
         fontset = XCreateFontSet(display,”8x16,-*-gb2312.1980-0″,
                 &missing_charset_list_return,
                 &missing_charset_count_return,
                 &def_string_return);
         if(missing_charset_count_return > 0){
             for(i=0;i<missing_charset_count_return;i++){
                 DUMP_ERR(”fontset(%s) missing\n”,
                         missing_charset_list_return[i]);
             }
             DUMP_ERR(”def string(%s)\n”,def_string_return);
             XFreeStringList(missing_charset_list_return);
             XCloseDisplay(display);
             return 1;
         }
     }

  	     //  create window
     win = XCreateSimpleWindow(display,
             RootWindow(display,screennum),
             0,0,width,height,3,
             BlackPixel(display,screennum),
             WhitePixel(display,screennum));

  	     protocols = XInternAtom(display, “WM_DELETE_WINDOW”, True);
     XSetWMProtocols(display, win, &protocols, 1); 

  	     //  select event
     XSelectInput(display,win,
             ExposureMask|KeyPressMask
             |ButtonPressMask|StructureNotifyMask);

  	     //  create gc
     {
         unsigned long valuemask = 0;
         XGCValues   values;
         gc  = XCreateGC(display,win,valuemask,&values);
     }

  	     //  show window
     XMapWindow(display,win);

  	     //  event loop
     while(1){
         XEvent  event;
         XNextEvent(display,&event);

  	         switch(event.type){
             case Expose:    // expose window
                 if( event.xexpose.count != 0) break;
                 draw(display,win,fontset,gc);
                 //XDrawString(display,win,gc,10,10,
                 //strdraw,strlen(strdraw));
                 break;

  	             case ConfigureNotify:   // when the window’s size change
                 width   = event.xconfigure.width;
                 height  = event.xconfigure.height;
                 break;
             case ClientMessage :
                 if(event.xclient.data.l[0] == protocols){
                     DUMP_ERR(”recv destroy notify\n”);
                     XFreeFontSet(display,fontset);
                     XFreeGC(display,gc);
                     XDestroyWindow(display, win);
                     XCloseDisplay(display);
                 }
                 return 0;

  	             default:
                 break;
         }
     }
 }

  	 static void draw(Display *display,Window win,XFontSet fontset,GC gc)
 {
     const char* pout = “Helo 你好 ,这是中文显示 i使用mb与wc两种输出”;
     wchar_t wbuf[256];
     int wlen    = mbstowcs(wbuf,pout,strlen(pout));

  	     XmbDrawString(display,win,fontset,gc,10,10,pout,strlen(pout));
     XwcDrawString(display,win,fontset,gc,10,50,wbuf,wlen);
 }