X Window研究笔记(22)

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X Window研究笔记(22)

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作者联系方式：李先静 <xianjimli at hotmail dot com><br><br>22.X Window 简单示例<br><br>对大多数linux程序员来说，很少有机会直接用Xlib去开发应用程序，那样开发效率太低，一般都是使用基于像GTK＋和QT这样的toolkit。不过了解一下</xianjimli>XWindow编程没有什么坏处，这里举一个简单的例子，供新手参考：

xdemo.c

#include string.h>
#includeX11/Xlib.h>
#includeX11/keysym.h>

intmain(intargc,char*argv[])
...{
Display*display=XOpenDisplay(NULL);
intscreen=DefaultScreen(display);
intwidth=DisplayWidth(display,screen)/2;
intheight=DisplayHeight(display,screen)/2;

Windowwin=XCreateSimpleWindow(display,RootWindow(display,screen),
0,0,width,height,3,BlackPixel(display,screen),WhitePixel(display,screen));

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

GCgc=XCreateGC(display,win,0,NULL);

XMapWindow(display,win);

while(1)
...{
XEventevent=...{0};
XNextEvent(display,&event);
switch(event.type)
...{
caseConfigureNotify:
...{
width=event.xconfigure.width;
height=event.xconfigure.height;
break;
}
caseExpose:
...{
XSetForeground(display,gc,WhitePixel(display,screen));
XFillRectangle(display,win,gc,0,0,width,height);
XSetForeground(display,gc,BlackPixel(display,screen));
XDrawString(display,win,gc,width/2,height/2,"XWindow",7);
break;
}
caseKeyPress:
...{
if(event.xkey.keycode==XKeysymToKeycode(display,XK_Escape))
...{
XFreeGC(display,gc);
XCloseDisplay(display);
return0;
}
}
default:break;
}
}

return0;
}

Makefile

all :
gcc - g - lX11xdemo . c - oxdemo
clean :
rm - fxdemo

（我并不擅长X Window编程，请不要问我关于X Window编程的问题。）

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