问题
I am trying to write a Java program that logs what application I'm using every 5 seconds (this is a time tracker app). I need some way to find out what the current active window is. I found KeyboardFocusManager.getGlobalActiveWindow() but I can't get it to work right. A cross platform solution is preferable, but if one doesn't exist, then I'm developing for linux with X.Org. Thanks.
回答1:
I'm quite certain that you'll find there's no way to enumerate the active windows in pure Java (I've looked pretty hard before), so you'll need to code for the platforms you want to target.
On Mac OS X, you can launch an AppleScript using "osascript".
On X11, you can use xwininfo.
On Windows, you can probably launch some VBScript (e.g. this link looks promising).
If you're using SWT, you may be able to find some undocumented, non-public methods in the SWT libs, since SWT provides wrappers for a lot of the OS API's (e.g. SWT on Cocoa has the org.eclipse.swt.internal.cocoa.OS#objc_msgSend() methods that can be used to access the OS). The equivalent "OS" classes on Windows and X11 may have API's you can use.
回答2:
I have written a java program using user361601's script. I hope this will help others.
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class WindowAndProcessInfo4Linux {
public static final String WIN_ID_CMD = "xprop -root | grep " + "\"_NET_ACTIVE_WINDOW(WINDOW)\"" + "|cut -d ' ' -f 5";
public static final String WIN_INFO_CMD_PREFIX = "xwininfo -id ";
public static final String WIN_INFO_CMD_MID = " |awk \'BEGIN {FS=\"\\\"\"}/xwininfo: Window id/{print $2}\' | sed \'s/-[^-]*$//g\'";
public String execShellCmd(String cmd){
try {
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(new String[] { "/bin/bash", "-c", cmd });
int exitValue = process.waitFor();
System.out.println("exit value: " + exitValue);
BufferedReader buf = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = "";
String output = "";
while ((line = buf.readLine()) != null) {
output = line;
}
return output;
} catch (Exception e) {
System.out.println(e);
return null;
}
}
public String windowInfoCmd(String winId){
if(null!=winId && !"".equalsIgnoreCase(winId)){
return WIN_INFO_CMD_PREFIX+winId +WIN_INFO_CMD_MID;
}
return null;
}
public static void main (String [] args){
WindowAndProcessInfo4Linux windowAndProcessInfo4Linux = new WindowAndProcessInfo4Linux();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String winId = windowAndProcessInfo4Linux.execShellCmd(WIN_ID_CMD);
String winInfoMcd = windowAndProcessInfo4Linux.windowInfoCmd(winId);
String windowTitle = windowAndProcessInfo4Linux.execShellCmd(winInfoMcd);
System.out.println("window title is: "+ windowTitle);
}
}
// the thread.sleep is there so that you get time to switch to other window :) also, you may use quartz from spring to schedule it.
回答3:
To find the active Window(be it a frame or a dialog) in a java swing application you can use the following recursive method:
Window getSelectedWindow(Window[] windows) {
Window result = null;
for (int i = 0; i < windows.length; i++) {
Window window = windows[i];
if (window.isActive()) {
result = window;
} else {
Window[] ownedWindows = window.getOwnedWindows();
if (ownedWindows != null) {
result = getSelectedWindow(ownedWindows);
}
}
}
return result;
}
this is from here More clues on Window state here.
回答4:
I've written a bash script that logs the current active window: http://www.whitelamp.com/public/active-window-logger.html It uses a patched version of wmctrl but provides details of an alternative (slower) method using xprop and xwininfo.
The links to the wmctrl patch & source code and the script can be found above.
回答5:
I created this applescript while looking into similar topic - this one gets the specific window size
global theSBounds
tell application "System Events"
set this_info to {}
set theSBounds to {}
repeat with theProcess in processes
if not background only of theProcess then
tell theProcess
set processName to name
set theWindows to windows
end tell
set windowsCount to count of theWindows
if processName contains "xxxxxxxx" then
set this_info to this_info & processName
else if processName is not "Finder" then
if windowsCount is greater than 0 then
repeat with theWindow in theWindows
tell theProcess
tell theWindow
if (value of attribute "AXTitle") contains "Genymotion for personal use -" then
-- set this_info to this_info & (value of attribute "AXTitle")
set the props to get the properties of the theWindow
set theSBounds to {size, position} of props
set this_info to this_info & theSBounds
end if
end tell
end tell
end repeat
end if
end if
end if
end repeat
end tell
return theSBounds回答6:
Using SWT internals, I was able to put this together, and it seems to work nicely:
/** @return The currently active window's title */
public static final String getActiveWindowText() {
long /*int*/ handle = OS.GetForegroundWindow();
int length = OS.GetWindowTextLength(handle);
if(length == 0) return "";
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR(0, length + 1);
OS.GetWindowText(handle, buffer, length + 1);
return buffer.toString(0, length);
}
public static final void main(String[] args) {
try {
Thread.sleep(1000L);
} catch(InterruptedException e) {
Thread.currentThread().interrupt();
}
System.out.println(getActiveWindowText());
}
Prints: user interface - Get current active window's title in Java - Stack Overflow - Google Chrome
来源：https://stackoverflow.com/questions/1354254/get-current-active-windows-title-in-java