MacOSX: get foremost window title

I am using this code to get the window title:

tell application "System Events"
    set frontApp to name of first application process whose frontmost is true
end tell

tell application frontApp
    set window_name to name of front window
end tell

However, this fails in some cases. Obviously it fails when there is no open window but that is Ok. However, in some cases, for example for Texmaker, it fails with an error. It also doesn't work for Preview.

What would be a way to get the window title anyway, even for cases like Texma开发者_开发百科ker?

This seems to work always:

global frontApp, frontAppName, windowTitle

set windowTitle to ""
tell application "System Events"
    set frontApp to first application process whose frontmost is true
    set frontAppName to name of frontApp
    tell process frontAppName
        tell (1st window whose value of attribute "AXMain" is true)
            set windowTitle to value of attribute "AXTitle"
        end tell
    end tell
end tell

return {frontAppName, windowTitle}

Got the idea from Getting the currently open file and path from Preview.

Building off of Albert's answer, I'd instead do

global frontApp, frontAppName, windowTitle

set windowTitle to ""
tell application "System Events"
    set frontApp to first application process whose frontmost is true
    set frontAppName to name of frontApp
    set windowTitle to "no window"
    tell process frontAppName
        if exists (1st window whose value of attribute "AXMain" is true) then
            tell (1st window whose value of attribute "AXMain" is true)
                set windowTitle to value of attribute "AXTitle"
            end tell
        end if
    end tell
end tell

return {frontAppName, windowTitle}

This is a hack and I have no experience, but the advantage is that it doesn't crash if there's no window.

Give the following script a try:

tell application "System Events"
    set window_name to name of first window of (first application process whose frontmost is true)
end tell

I haven't verified that it works for TextMaker, though.

Here's an alternative version in jxa based off of this script. Includes the URL of the window if it's a common browser.

var seApp     = Application("System Events");
var oProcess  = seApp.processes.whose({frontmost: true})[0];
var appName   = oProcess.displayedName();

var url;
var title;

switch(appName) {
  case "Safari":
    url = Application(appName).documents[0].url();
    title = Application(appName).documents[0].name();
    break;
  case "Google Chrome", "Google Chrome Canary", "Chromium":
    url = Application(appName).windows[0].activeTab().url();
    title = Application(appName).windows[0].activeTab().name();
    break;
  default:
    title = oProcess.
      windows().
      find(w => w.attributes.byName("AXMain").value() === true).
      attributes.
      byName("AXTitle").
      value()
}

JSON.stringify({
  appname: appName,
  url: url,
  title: title
});

You can run this on the command line via osascript -l JavaScript ./script.jxa