从屏幕获取像素颜色

Question

I'm trying to find out the color value of a specific pixel(which will be specified using screen coordinates(100,100) for example) using xlib, this is a cli tool.

here's some code I have been trying out(no dice):

Display *display;
    display = XOpenDisplay(NULL);
    Window root = XDefaultRootWindow(display);
    XImage *image;
    image = XGetImage(display,root,0,0,1,1,AllPlanes,XYPixmap);
    printf("pixel:%lu\n",XGetPixel(image,0,0));
    XCloseDisplay(display);

it always prints 0 if I change tthe x,y value of XGetPixel to a value other than 0

maybe I'm looking in the wrong place or using teh wrong functions

thanks

Answer 1

我忘了改变1,1的宽度设置正确地修复了一切