X Window研究笔记(22)
转载时请注明出处和作者联系方式
作者联系方式：李先静
22.X Window 简单示例
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 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>
#include <X11/Xlib.h>
#include <X11/keysym.h>
int main(int argc, char* argv[])
{
Display* display = XOpenDisplay(NULL);
int screen = DefaultScreen(display);
int width = DisplayWidth(display, screen)/2;
int height = DisplayHeight(display, screen)/2;
Window win = XCreateSimpleWindow(display, RootWindow(display, screen),
0, 0, width, height, 3, BlackPixel(display, screen), WhitePixel(display, screen));
XSelectInput(display, win, ExposureMask|KeyPressMask | ButtonPressMask | StructureNotifyMask);
GC gc = XCreateGC(display, win, 0, NULL);
XMapWindow(display, win);
while(1)
{
XEvent event = {0};
XNextEvent(display, &event);
switch(event.type)
{
case ConfigureNotify:
{
width = event.xconfigure.width;
height = event.xconfigure.height;
break;
}
case Expose:
{
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;
}
case KeyPress:
{
if(event.xkey.keycode == XKeysymToKeycode(display, XK_Escape))
{
XFreeGC(display, gc);
XCloseDisplay(display);
return 0;
}
}
default:break;
}
}
return 0;
}
Makefile
all:
gcc -g -lX11 xdemo.c -o xdemo
clean:
rm -f xdemo
（我并不擅长X Window编程，请不要问我关于X Window编程的问题。）
~~end~~
转载时请注明出处和作者联系方式
作者联系方式：李先静
22.X Window 简单示例
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 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>#include <X11/Xlib.h>#include <X11/keysym.h>int main(int argc, char* argv[]){
Display* display = XOpenDisplay(NULL); int screen = DefaultScreen(display); int width = DisplayWidth(display, screen)/2; int height = DisplayHeight(display, screen)/2; Window win = XCreateSimpleWindow(display, RootWindow(display, screen), 0, 0, width, height, 3, BlackPixel(display, screen), WhitePixel(display, screen)); XSelectInput(display, win, ExposureMask|KeyPressMask | ButtonPressMask | StructureNotifyMask); GC gc = XCreateGC(display, win, 0, NULL); XMapWindow(display, win); while(1) {
XEvent event = {0}; XNextEvent(display, &event); switch(event.type) { case ConfigureNotify: { width = event.xconfigure.width; height = event.xconfigure.height; break; } case Expose: { 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; } case KeyPress: { if(event.xkey.keycode == XKeysymToKeycode(display, XK_Escape)) { XFreeGC(display, gc); XCloseDisplay(display); return 0; } } default:break; } } return 0;}
Makefile
all: gcc -g -lX11 xdemo.c -o xdemoclean: rm -f xdemo
（我并不擅长X Window编程，请不要问我关于X Window编程的问题。）
~~end~~
