如何在Linux上以编程方式打开/关闭Caps Lock,Scroll Lock和Num Lock键 [英] How can I turn on/off Caps Lock, Scroll Lock, Num Lock key programatically on Linux
问题描述
在使用C ++的Linux(OpenSuse)上是否有一种简单的方法来打开/关闭Caps Lock,Scroll Lock和Num Lock,需要使用哪些头文件? 我想控制一些设备来模拟击键.
Is there a simple method to turn on/off Caps Lock, Scroll Lock and Num Lock on Linux (OpenSuse) using C++, what header files need to use? I want to control some device simulates keystrokes.
推荐答案
解决方案1
请继续前进,因为此解决方案只是打开键盘的LED,如果您还需要启用 caps lock 功能,请参阅解决方案2.
Solution 1
Please go head because this solution just turn on the led of the keyboard, if you need to enable the caps lock funcion too, see solution 2.
// Linux header, no portable source
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
int main(int argc, char* argv[]) {
int fd_console = open("/dev/console", O_WRONLY);
if (fd_console == -1) {
std::cerr << "Error opening console file descriptor\n";
exit(-1);
}
// turn on caps lock
ioctl(fd_console, 0x4B32, 0x04);
// turn on num block
ioctl(fd_console, 0x4B32, 0x02);
// turn off
ioctl(fd_console, 0x4B32, 0x0);
close(fd_console);
return 0;
}
请记住,您必须以超级用户权限启动程序才能写入文件/dev/console
.
Remember you have to launch your program with superuser privileges in order to write in the file /dev/console
.
此解决方案可与X11窗口系统管理器一起使用(在Linux上几乎是标准的).
This solution works with X11 window system manager (on linux is almost a standard).
// X11 library and testing extensions
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/extensions/XTest.h>
int main(int argc, char *argv[]) {
// Get the root display.
Display* display = XOpenDisplay(NULL);
// Get the keycode for XK_Caps_Lock keysymbol
unsigned int keycode = XKeysymToKeycode(display, XK_Caps_Lock);
// Simulate Press
XTestFakeKeyEvent(display, keycode, True, CurrentTime);
XFlush(display);
// Simulate Release
XTestFakeKeyEvent(display, keycode, False, CurrentTime);
XFlush(display);
return 0;
}
注意:更多的键符号可以在标题 .
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