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get the active window on X window system.
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| // -*- coding:utf-8-unix; mode:c; -*- | |
| // | |
| // get the active window on X window system | |
| // | |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <locale.h> | |
| #include <X11/Xlib.h> // `apt-get install libx11-dev` | |
| #include <X11/Xmu/WinUtil.h> // `apt-get install libxmu-dev` | |
| Bool xerror = False; | |
| Display* open_display(){ | |
| printf("connecting X server ... "); | |
| Display* d = XOpenDisplay(NULL); | |
| if(d == NULL){ | |
| printf("fail\n"); | |
| exit(1); | |
| }else{ | |
| printf("success\n"); | |
| } | |
| return d; | |
| } | |
| int handle_error(Display* display, XErrorEvent* error){ | |
| printf("ERROR: X11 error\n"); | |
| xerror = True; | |
| return 1; | |
| } | |
| Window get_focus_window(Display* d){ | |
| Window w; | |
| int revert_to; | |
| printf("getting input focus window ... "); | |
| XGetInputFocus(d, &w, &revert_to); // see man | |
| if(xerror){ | |
| printf("fail\n"); | |
| exit(1); | |
| }else if(w == None){ | |
| printf("no focus window\n"); | |
| exit(1); | |
| }else{ | |
| printf("success (window: %d)\n", (int)w); | |
| } | |
| return w; | |
| } | |
| // get the top window. | |
| // a top window have the following specifications. | |
| // * the start window is contained the descendent windows. | |
| // * the parent window is the root window. | |
| Window get_top_window(Display* d, Window start){ | |
| Window w = start; | |
| Window parent = start; | |
| Window root = None; | |
| Window *children; | |
| unsigned int nchildren; | |
| Status s; | |
| printf("getting top window ... \n"); | |
| while (parent != root) { | |
| w = parent; | |
| s = XQueryTree(d, w, &root, &parent, &children, &nchildren); // see man | |
| if (s) | |
| XFree(children); | |
| if(xerror){ | |
| printf("fail\n"); | |
| exit(1); | |
| } | |
| printf(" get parent (window: %d)\n", (int)w); | |
| } | |
| printf("success (window: %d)\n", (int)w); | |
| return w; | |
| } | |
| // search a named window (that has a WM_STATE prop) | |
| // on the descendent windows of the argment Window. | |
| Window get_named_window(Display* d, Window start){ | |
| Window w; | |
| printf("getting named window ... "); | |
| w = XmuClientWindow(d, start); // see man | |
| if(w == start) | |
| printf("fail\n"); | |
| printf("success (window: %d)\n", (int) w); | |
| return w; | |
| } | |
| // (XFetchName cannot get a name with multi-byte chars) | |
| void print_window_name(Display* d, Window w){ | |
| XTextProperty prop; | |
| Status s; | |
| printf("window name:\n"); | |
| s = XGetWMName(d, w, &prop); // see man | |
| if(!xerror && s){ | |
| int count = 0, result; | |
| char **list = NULL; | |
| result = XmbTextPropertyToTextList(d, &prop, &list, &count); // see man | |
| if(result == Success){ | |
| printf("\t%s\n", list[0]); | |
| }else{ | |
| printf("ERROR: XmbTextPropertyToTextList\n"); | |
| } | |
| }else{ | |
| printf("ERROR: XGetWMName\n"); | |
| } | |
| } | |
| void print_window_class(Display* d, Window w){ | |
| Status s; | |
| XClassHint* class; | |
| printf("application: \n"); | |
| class = XAllocClassHint(); // see man | |
| if(xerror){ | |
| printf("ERROR: XAllocClassHint\n"); | |
| } | |
| s = XGetClassHint(d, w, class); // see man | |
| if(xerror || s){ | |
| printf("\tname: %s\n\tclass: %s\n", class->res_name, class->res_class); | |
| }else{ | |
| printf("ERROR: XGetClassHint\n"); | |
| } | |
| } | |
| void print_window_info(Display* d, Window w){ | |
| printf("--\n"); | |
| print_window_name(d, w); | |
| print_window_class(d, w); | |
| } | |
| int main(void){ | |
| Display* d; | |
| Window w; | |
| // for XmbTextPropertyToTextList | |
| setlocale(LC_ALL, ""); // see man locale | |
| d = open_display(); | |
| XSetErrorHandler(handle_error); | |
| // get active window | |
| w = get_focus_window(d); | |
| w = get_top_window(d, w); | |
| w = get_named_window(d, w); | |
| print_window_info(d, w); | |
| } |
Do you know what package for pkg-config will make it able to compile?
I am also sad to his blog post on this having disappeared.
@kui Thank you for this code! What is the license?
Author
http://k-ui.jp/blog/2012/05/07/get-active-window-on-x-window-system/ might be missed from my blog... and I can't remember it. I removed it from this gist.
@cxw42 I'm not going to claim a license for this code. Please feel free to use it.
@kui Thank you!
@kui Also giving you my thanks, I've already been using it as a base for Kinto. It looks a good deal different at this point and I am moving on to re-using xkeysnail and contributing code to that project to make it a better replacement for my own use case scenarios.
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