Retrieve data from current window

What to retrieve:

• Window title
• Exec path
• Window class (window name)
• URL of browsers (not supported yet)

Linux

• Get window raw id: xprop -root _NET_ACTIVE_WINDOW -> Result _NET_ACTIVE_WINDOW(WINDOW): window id # 0xa00003
• Get window id:
  • Get first hex number 0x1a0003
  • Parse to int -> 10485763
• Get window information by id: LC_ALL=C.utf8 xprop -id <window_id> . Then retrieve these information
  • WM_CLASS(STRING) : Window class (Window name)
  • WM_NAME(UTF8_STRING) | _NET_WM_NAME(UTF8_STRING) = Window title
  • _NET_WM_PID(CARDINAL): Window PID
• From PID, get exec path by readlink /proc/<pid>/exe

Windows

• Get window id: GetForegroundWindow() -> HWND
• From window id:
  • Get PID: GetWindowThreadProcessId(HWND, *mut DWORD) -> BOOL
  • Open process handle: OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, <PID>)
• Get exec path: GetModuleFileNameW -> From exec path, get window name
• Get window title: GetWindowTextW(HWND, &title)

Mac

Need more research.

About collect URLs from browsers

There are many ways:

• Access browser's shared memory/data directly. It's not only difficult to do, but also painful on different browsers.
• Use browser's extension. Extensions can communitcate to a process by native messaging or via calling HTTP request to a private network (usually localhost). It's easy to do, but it's quite annoying to install extension for each browser for users.
• Catch browser's network requests, then parse URLs. It's crazy to do, exhausted parsing, mapping data and it's not reliable