Linux 如何通过代码实现截屏键禁用

Linux可以通过代码实现截屏键禁用的方法如下：

1. 使用X11 API获取当前窗口ID

#include <X11/Xlib.h>

Display *display = XOpenDisplay(NULL);
Window window = XDefaultRootWindow(display);

2. 使用X11 API创建一个新的窗口

Window overlayWindow = XCreateSimpleWindow(display, window, 0, 0, screen_width, screen_height, 0, 0, 0);

3. 将该窗口置于所有窗口之上，并设置透明度为0

XSetWindowAttributes attrs;
attrs.override_redirect = True;
attrs.background_pixel = 0;
attrs.border_pixel = 0;
attrs.colormap = XDefaultColormap(display, 0);
attrs.event_mask = ExposureMask | KeyPressMask;
XChangeWindowAttributes(display, overlayWindow, CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect, &attrs);
XMapWindow(display, overlayWindow);
XRaiseWindow(display, overlayWindow);

XRenderPictFormat *format = XRenderFindStandardFormat(display, PictStandardARGB32);
XRenderPictureAttributes pa;
pa.subwindow_mode = IncludeInferiors;
pa.alpha_map = XCreatePixmap(display, window, 1, 1, 32);
XRenderPictureAttributes pa2;
pa2.subwindow_mode = IncludeInferiors;
XRenderPictureAttributes pa3;
pa3.repeat = True;
Picture alpha_picture = XRenderCreatePicture(display, pa.alpha_map, format, CPRepeat, &pa3);

4. 监听按键事件，如果是截屏键（一般是Print Screen键），则屏蔽该事件

XEvent event;
while (1) {
    XNextEvent(display, &event);
    if (event.type == KeyPress) {
        KeySym keySym = XKeycodeToKeysym(display, event.xkey.keycode, 0);
        if (keySym == XK_Print) {
            // 屏蔽截屏键
            continue;
        }
    }
    // 处理其他事件
}

5. 释放资源

XFreeColormap(display, attrs.colormap);
XDestroyWindow(display, overlayWindow);
XCloseDisplay(display);

完整代码如下：

#include <X11/Xlib.h>
#include <X11/extensions/Xrender.h>
#include <stdio.h>

int main() {
    Display *display = XOpenDisplay(NULL);
    Window window = XDefaultRootWindow(display);
    int screen_width = XDisplayWidth(display, 0);
    int screen_height = XDisplayHeight(display, 0);

    Window overlayWindow = XCreateSimpleWindow(display, window, 0, 0, screen_width, screen_height, 0, 0, 0);
    XSetWindowAttributes attrs;
    attrs.override_redirect = True;
    attrs.background_pixel = 0;
    attrs.border_pixel = 0;
    attrs.colormap = XDefaultColormap(display, 0);
    attrs.event_mask = ExposureMask | KeyPressMask;
    XChangeWindowAttributes(display, overlayWindow, CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect, &attrs);
    XMapWindow(display, overlayWindow);
    XRaiseWindow(display, overlayWindow);

    XRenderPictFormat *format = XRenderFindStandardFormat(display, PictStandardARGB32);
    XRenderPictureAttributes pa;
    pa.subwindow_mode = IncludeInferiors;
    pa.alpha_map = XCreatePixmap(display, window, 1, 1, 32);
    XRenderPictureAttributes pa2;
    pa2.subwindow_mode = IncludeInferiors;
    XRenderPictureAttributes pa3;
    pa3.repeat = True;
    Picture alpha_picture = XRenderCreatePicture(display, pa.alpha_map, format, CPRepeat, &pa3);

    XEvent event;
    while (1) {
        XNextEvent(display, &event);
        if (event.type == KeyPress) {
            KeySym keySym = XKeycodeToKeysym(display, event.xkey.keycode, 0);
            if (keySym == XK_Print) {
                printf("截屏键已屏蔽\n");
                continue;
            }
        }
        // 处理其他事件
    }

    XFreeColormap(display, attrs.colormap);
    XDestroyWindow(display, overlayWindow);
    XCloseDisplay(display);
    return 0;
}