Xlib
Xlib是一種X Window System協定的用戶端,以C語言撰寫。其功能是與X server溝通。這樣的功能可以讓程式人員撰寫程式時,毋須了解其協定的細節。但甚少應用程式會直接使用Xlib;通常是透過其他的函式庫來呼叫Xlib用以提供部件工具箱(widget toolkits):
開發者 | X.Org基金会 |
---|---|
初始版本 | 大约1985年 |
源代码库 | |
编程语言 | C |
类型 | 库 |
网站 | www |
Xlib發表於1985年,目前使用在許多的Unix-like作業系統上。
目前XCB有可能取代Xlib.
資料型別
Xlib主要的資料型別是Display
[1]結構。
範例
下面是一個XLib的範列,產生一個視窗。
/*
Simple Xlib application drawing a box in a window.
gcc input.c -o output -lX11
*/
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
int main(void)
{
Display *d;
Window w;
XEvent e;
char *msg = "Hello, World!";
int s;
bool done = false;
/* open connection with the server */
d = XOpenDisplay(NULL);
if (d == NULL) {
fprintf(stderr, "Cannot open display\n");
exit(1);
}
s = DefaultScreen(d);
/* create window */
w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 640, 480, 0,
BlackPixel(d, s), WhitePixel(d, s));
/* register interest in the delete window message */
Atom wmDeleteMessage = XInternAtom(d, "WM_DELETE_WINDOW", False);
XSetWMProtocols(d, w, &wmDeleteMessage, 1);
/* select kind of events we are interested in */
XSelectInput(d, w, ExposureMask | KeyPressMask | StructureNotifyMask);
/* map (show) the window */
XMapWindow(d, w);
/* event loop */
while (!done) {
XNextEvent(d, &e);
/* draw or redraw the window */
if (e.type == Expose) {
XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
XDrawString(d, w, DefaultGC(d, s), 50, 50, msg, strlen(msg));
}
/* exit on key press */
switch(e.type){
case KeyPress:
XDestroyWindow(d, w);
break;
case DestroyNotify:
done = true;
break;
case ClientMessage:
if (e.xclient.data.l[0] == wmDeleteMessage){
done = true;
}
break;
}
}
/* close connection to server */
XCloseDisplay(d);
return 0;
}
注釋
- . Tip search for: typedef struct _XDisplay Display. [2009-07-09]. (原始内容存档于2008-01-31).
外部連結
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