这是我的例子
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <ctype.h>
int main ()
{
Display* d = XOpenDisplay(NULL);
Window root = DefaultRootWindow(d);
Window curFocus;
char buf[17];
KeySym ks;
XComposeStatus comp;
int len;
int revert;
XGetInputFocus (d, &curFocus, &revert);
XSelectInput(d, curFocus, KeyPressMask|KeyReleaseMask|FocusChangeMask);
while (1)
{
XEvent ev;
XNextEvent(d, &ev);
switch (ev.type)
{
case FocusOut:
printf ("Focus changed!\n");
printf ("Old focus is %d\n", (int)curFocus);
if (curFocus != root)
XSelectInput(d, curFocus, 0);
XGetInputFocus (d, &curFocus, &revert);
printf ("New focus is %d\n", (int)curFocus);
if (curFocus == PointerRoot)
curFocus = root;
XSelectInput(d, curFocus, KeyPressMask|KeyReleaseMask|FocusChangeMask);
break;
case KeyPress:
printf ("Got key!\n");
len = XLookupString(&ev.xkey, buf, 16, &ks, &comp);
if (len > 0 && isprint(buf[0]))
{
buf[len]=0;
printf("String is: %s\n", buf);
}
else
{
printf ("Key is: %d\n", (int)ks);
}
}
}
}
它不可靠，但在大多数情况下都有效。（它显示的是我正在此框中输入的键）。您可能会调查为什么有时会失败；）原则上它也不能显示热键。热键是获取的密钥，只有一个客户端可以获取获取的密钥。除了加载为此目的而设计的特殊X11扩展（例如XEvIE）以外，这里绝对不能做任何事情。
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