How can I get the current mouse (pointer) position co-ordinates in X

This can either be some sample C code or a utility that will show me either gui or on the console it doesn't matter, but I have to be able to "command" it to grab the co-ordi开发者_开发知识库nates at an exact time which makes xev not very useful (that I could figure out).

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I'm not a C programmer by any means but I looked at a couple of online tutorials and think this is how you are supposed to read the current mouse position. This is my own code and I'd done nothing with Xlib before so it could be completely broken (for example, the error handler shouldn't just do nothing for every error) but it works. So here is another solution:

#include <X11/Xlib.h>
#include <assert.h>
#include <unistd.h>
#include <stdio.h>
#include <malloc.h>

static int _XlibErrorHandler(Display *display, XErrorEvent *event) {
    fprintf(stderr, "An error occured detecting the mouse position\n");
    return True;
}

int main(void) {
    int number_of_screens;
    int i;
    Bool result;
    Window *root_windows;
    Window window_returned;
    int root_x, root_y;
    int win_x, win_y;
    unsigned int mask_return;

    Display *display = XOpenDisplay(NULL);
    assert(display);
    XSetErrorHandler(_XlibErrorHandler);
    number_of_screens = XScreenCount(display);
    fprintf(stderr, "There are %d screens available in this X session\n", number_of_screens);
    root_windows = malloc(sizeof(Window) * number_of_screens);
    for (i = 0; i < number_of_screens; i++) {
        root_windows[i] = XRootWindow(display, i);
    }
    for (i = 0; i < number_of_screens; i++) {
        result = XQueryPointer(display, root_windows[i], &window_returned,
                &window_returned, &root_x, &root_y, &win_x, &win_y,
                &mask_return);
        if (result == True) {
            break;
        }
    }
    if (result != True) {
        fprintf(stderr, "No mouse found.\n");
        return -1;
    }
    printf("Mouse is at (%d,%d)\n", root_x, root_y);

    free(root_windows);
    XCloseDisplay(display);
    return 0;
}

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xdotool might be the best tool for this.

For C, you can use libxdo.

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Actually, xev is very useful if you supply it with the window id grabbed using xwininfo, then it can easily perform this task for you. There are no doubt much more elegant solutions but it works.

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xinput can be used to print the full device state of any input device.

First you need to discover your device id:

$ xinput --list | grep -i mouse                                                                                                                                
⎜   ↳ Logitech USB Receiver Mouse               id=11   [slave  pointer  (2)]

then you can ask for state:

$ xinput --query-state 11;
2 classes :
ButtonClass
        button[1]=up
        button[2]=up
        button[3]=up
        button[4]=up
        button[5]=up
        button[6]=up
        button[7]=up
        button[8]=up
        button[9]=up
        button[10]=up
        button[11]=up
        button[12]=up
        button[13]=up
        button[14]=up
        button[15]=up
        button[16]=up
        button[17]=up
        button[18]=up
        button[19]=up
        button[20]=up
ValuatorClass Mode=Relative Proximity=In
        valuator[0]=274
        valuator[1]=886
        valuator[2]=0
        valuator[3]=675

Or just a loop:

while sleep .2; do xinput --query-state $(xinput --list | grep -i mouse | cut -d= -f2 | cut -f1| head -1); done