[英]Possible to change screen brightness with C?
在Linux中使用C,是否可以改變查看屏幕的亮度? 除了在我安裝的 Ubuntu 和 Fedora 上運行之外,預計它不會是可移植的。 我在問我如何與操作系統交互來改變亮度。
我將從以下 ubuntu 軟件包列表中進行選擇,該工具可讓您管理屏幕亮度(提示:這取決於品牌)
nvidia-settings - Tool of configuring the NVIDIA graphics driver
smartdimmer - Change LCD brightness on Geforce cards
armada-backlight - adjust backlight of Compaq Armada laptops (E300, M500, M700)
ddccontrol - a program to control monitor parameters
eeepc-acpi-scripts - Scripts to support suspend and hotkeys on the Asus Eee PC laptop
fnfxd - ACPI and hotkey daemon for Toshiba laptops
gddccontrol - a program to control monitor parameters
spicctrl - Sony Vaio controller program to set LCD backlight brightness
tpb - program to use the IBM ThinkPad(tm) special keys
xfce4-power-manager - power manager for Xfce desktop
xfce4-power-manager-plugins - power manager plugins for Xfce panel
xvattr - Utility to change Xv attributes
一旦你選擇了它,
sudo apt-get build-dep <pkgname>
apt-get source --compile <pkgname>
應該讓你走上正軌
戳/sys/class/backlight/*/brightness
。 是的,即使在 C 中也是如此。
是的,但不是可移植的——您需要特定於平台的 function,C 標准庫中沒有任何內容。
查看xbacklight 光源。 例如,以下代碼將屏幕亮度設置為 50%。
// brightness.c
// gcc -o brightness brightness.c -lXrandr -lX11
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>
#define BRIGHTNESS 0.5 // Target brightness between 0.0 and 1.0
int main(int argc, char *argv[])
{
Display *dpy;
static Atom backlight;
int screen = 0, o = 0;
Window root;
XRRScreenResources *resources;
RROutput output;
XRRPropertyInfo *info;
double min, max;
long value;
dpy = XOpenDisplay(NULL);
backlight = XInternAtom (dpy, "Backlight", True);
root = RootWindow(dpy, screen);
resources = XRRGetScreenResources(dpy, root);
output = resources->outputs[o];
info = XRRQueryOutputProperty(dpy, output, backlight);
min = info->values[0];
max = info->values[1];
XFree(info); // Don't need this anymore
XRRFreeScreenResources(resources); // or this
value = BRIGHTNESS * (max - min) + min;
XRRChangeOutputProperty(dpy, output, backlight, XA_INTEGER,
32, PropModeReplace, (unsigned char *) &value, 1);
XFlush(dpy);
XSync(dpy, False);
return 0;
}
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