Xlib如何在启动画面中绘制字符串
这是我的代码,我无法跳出while(!done)函数
使用XFlush(d)可以显示显示窗体缓冲区,并且在XCloseDisplay(d)之前不会消失
我想像这样画画线
g ++ -o youname youcppname -lX11
#include <X11/Xlib.h>#include <X11/Xatom.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main(void)
{
Display *d;
Window w;
XEvent e;
const 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, 480, 320, 0,BlackPixel(d, s), WhitePixel(d, s));
Atom type = XInternAtom(d,"_NET_WM_WINDOW_TYPE", False);
Atom value = XInternAtom(d,"_NET_WM_WINDOW_TYPE_SPLASH", False);
XChangeProperty(d, w, type, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(&value), 1);
/* 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)
{
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;
}
回答:
我不太确定为什么XFlush不起作用,但这是事件循环和冲洗的混合体。它等待暴露事件,绘制字符串并退出循环。
5秒钟后,它将取消映射窗口,然后5秒钟后退出。
#include <X11/Xlib.h>#include <X11/Xatom.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main(void)
{
Display *d;
Window w;
XEvent e;
const 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, 480, 320, 0,BlackPixel(d, s), WhitePixel(d, s));
Atom type = XInternAtom(d,"_NET_WM_WINDOW_TYPE", False);
Atom value = XInternAtom(d,"_NET_WM_WINDOW_TYPE_SPLASH", False);
XChangeProperty(d, w, type, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(&value), 1);
/* 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);
/* map (show) the window */
XMapWindow(d, w);
/* event loop */
while (!done)
{
XNextEvent(d, &e);
/* draw or redraw the window */
if (e.type == Expose)
{
XDrawString(d, w, DefaultGC(d, s), 50, 50, msg, strlen(msg));
done = true;
}
}
XFlush(d);
sleep(5);
XUnmapWindow(d,w);
XFlush(d);
printf("unmapped\n");
sleep(5);
/* close connection to server */
XCloseDisplay(d);
return 0;
}
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