点击鼠标获得与Xlib的坐标 [英] getting mouseclick coordinates with Xlib

问题描述

我想知道如何获得一个鼠标点击的x和y坐标与Xlib的屏幕上的任何地方。我发现这个职位它获取当前指针位置

I would like to know how to get the x and y coordinates of a mouseclick with Xlib anywhere on the screen. I've found this post which gets the current pointer position

<一个href=\"http://stackoverflow.com/questions/3585871/how-can-i-get-the-current-mouse-pointer-position-co-ordinates-in-x\">How我可以得到当前鼠标（指针）的位置坐标x中，

但我不知道如何使其获得点击鼠标时的X，Y坐标修改。
我试着写code，但它什么都不做。

but I don't know how to modify it so it gets the x y coordinates when the mouse is clicked. I've tried to write this code but it does nothing.

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main (){
int x=-1,y=-1;
XEvent event;
int button;
Display *display = XOpenDisplay(NULL);
if (display == NULL) {
    fprintf(stderr, "Cannot connect to X server!\n");
    exit (EXIT_FAILURE);
}
Window root= XDefaultRootWindow(display);
XSelectInput(display, root, ButtonReleaseMask) ;
while(1){
XNextEvent(display,&event);
switch(event.type){
    case ButtonRelease:
        switch(event.xbutton.button){
            case Button1:
                x=event.xbutton.x;
                y=event.xbutton.y;
                button=Button1;
                break;

            case Button3:
                x=event.xbutton.x;
                y=event.xbutton.y;
                button=Button3;
                break;
            default:
                break;

        }
        break;
    default:
        break;
}
if(x>=0 && y>=0)break;
}
if(button==Button1)printf("leftclick at %d %d \n",x,y);
else printf("rightclick at %d %d \n",x,y);
XCloseDisplay(display);
return 0;
}

该事件可能发送到其他窗口，这是它不工作的原因。另一个问题是，当我添加按钮pressMask到XSelectInput功能我得到以下错误：

The events are probably send to other windows and that is the reason it's not working. Another problem is that when I add ButtonPressMask to the XSelectInput function I get the following error:

X Error of failed request:  BadAccess (attempt to access private resource denied)
Major opcode of failed request:  2 (X_ChangeWindowAttributes)
Serial number of failed request:  7
Current serial number in output stream:  7

如果有在C做这个简单的方法，我很高兴听到这个消息。

If there is simpler way to do this in C, I am happy to hear it.

推荐答案

您可能会需要获取指针。

You'll probably need to grab the pointer.

我不知道，如果你想只是想释放按钮presses。我已经改成了presses，但你可以拿起都与

I don't know if you want just want button presses of releases. I've changed it to presses, but you can pick up both with:

XSelectInput(display, root, ButtonPressMask|ButtonReleaseMask) ;

和添加ButtonRelease情况回。

and add the ButtonRelease case back in.

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main (){
    int x=-1,y=-1;
    XEvent event;
    int button;
    Display *display = XOpenDisplay(NULL);
    if (display == NULL) {
    fprintf(stderr, "Cannot connect to X server!\n");
    exit (EXIT_FAILURE);
    }
    Window root= XDefaultRootWindow(display);
    XGrabPointer(display, root, False, ButtonPressMask, GrabModeAsync,
         GrabModeAsync, None, None, CurrentTime);

    XSelectInput(display, root, ButtonPressMask) ;
    while(1){
    XNextEvent(display,&event);
    switch(event.type){
    case ButtonPress:
        switch(event.xbutton.button){
        case Button1:
        x=event.xbutton.x;
        y=event.xbutton.y;
        button=Button1;
        break;

        case Button3:
        x=event.xbutton.x;
        y=event.xbutton.y;
        button=Button3;
        break;
        default:
        break;

        }
        break;
    default:
        break;
    }
    if(x>=0 && y>=0)break;
    }
    if(button==Button1)printf("leftclick at %d %d \n",x,y);
    else printf("rightclick at %d %d \n",x,y);
    XCloseDisplay(display);
    return 0;
}

这篇关于点击鼠标获得与Xlib的坐标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！