B4J Question How to get the TaskBar Height and position?

[Cableguy]

Hi Guys and Girls,

Well, the title says it all, I guess...

I need to get the taskbar height, and position....

 

[teddybear]

What is the postion of the TaskBar you meant, is it on the top,left right or bottom of the screen?

 

[Cableguy]

What is the postion of the TaskBar you meant, is it on the top,left right or bottom of the screen?

Yes

 

[Sandman]

I need to get the taskbar height, and position....

You can probably help getting this answered by posting some links to code examples found on the internet that give those values.

 

[teddybear]

You can do that using jna, the code is below

Sub Button1_Click
    Dim jo As JavaObject=Me
    jo.RunMethod("taskbar",Null)
End Sub

#if java
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.RECT;
import com.sun.jna.platform.win32.WinDef.HWND;
    public static void taskbar() {
        User32 user32 = User32.INSTANCE;
        HWND hWnd = user32.FindWindow("Shell_TrayWnd", null);
        if (hWnd != null) {
            RECT rect = new RECT();
            user32.GetWindowRect(hWnd, rect);
            int x = rect.left;
            int y = rect.top;
            int width = rect.right - rect.left;
            int height = rect.bottom - rect.top;
            BA.Log("Task Bar Location: (" + x + ", " + y + ")");
            BA.Log("Task Bar Size: " + width + "x" + height);
        }
    }
#End If

Log

'Right
Task Bar Location: (1827, 0)
Task Bar Size: 93x1080
'Top
Task Bar Location: (0, 0)
Task Bar Size: 1920x40
'Left
Task Bar Location: (0, 0)
Task Bar Size: 93x1080
'Bottom
Task Bar Location: (0, 1040)
Task Bar Size: 1920x40

 

[Cableguy]

You can probably help getting this answered by posting some links to code examples found on the internet that give those values.

Amongst some results I found, this seem to be the most complete and pertinent piece of code:

public enum Location {
    TOP, RIGHT, BOTTOM, LEFT;
}

private static final class Taskbar {
    public final Location location;
    public final int width, height;

    private Taskbar(Location location, int width, int height) {
        this.location = location;
        this.width = width;
        this.height = height;
    }

    public static Taskbar getTaskbar() {
        Rectangle other = GraphicsEnvironment.getLocalGraphicsEnvironment()
                .getMaximumWindowBounds();
        return new Taskbar(other.x != 0 ? Location.TOP
                : (other.y != 0 ? Location.LEFT
                        : (other.width == IFrame.width ? Location.BOTTOM
                                : Location.RIGHT)), IFrame.width
                - other.width, IFrame.height - other.height);
    }
}

According to the OP...
"Essentially, calling Taskbar.getTaskbar() will give a taskbar containing information on its location (TOP, RIGHT, BOTTOM, LEFT), its width, and its height."

 

[teddybear]

'Right
Task Bar Location: (1827, 0)
Task Bar Size: 93x1080
'Top
Task Bar Location: (0, 0)
Task Bar Size: 1920x40
'Left
Task Bar Location: (0, 0)
Task Bar Size: 93x1080
'Bottom
Task Bar Location: (0, 1040)
Task Bar Size: 1920x40

You can determine the position based on coordinates and aspect ratio

 

[Cableguy]

You can do that using jna, the code is below

Sub Button1_Click
    Dim jo As JavaObject=Me
    jo.RunMethod("taskbar",Null)
End Sub

#if java
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.RECT;
import com.sun.jna.platform.win32.WinDef.HWND;
    public static void taskbar() {
        User32 user32 = User32.INSTANCE;
        HWND hWnd = user32.FindWindow("Shell_TrayWnd", null);
        if (hWnd != null) {
            RECT rect = new RECT();
            user32.GetWindowRect(hWnd, rect);
            int x = rect.left;
            int y = rect.top;
            int width = rect.right - rect.left;
            int height = rect.bottom - rect.top;
            BA.Log("Task Bar Location: (" + x + ", " + y + ")");
            BA.Log("Task Bar Size: " + width + "x" + height);
        }
    }
#End If

Log

'Right
Task Bar Location: (1827, 0)
Task Bar Size: 93x1080
'Top
Task Bar Location: (0, 0)
Task Bar Size: 1920x40
'Left
Task Bar Location: (0, 0)
Task Bar Size: 93x1080
'Bottom
Task Bar Location: (0, 1040)
Task Bar Size: 1920x40

Using your code I'm getting this error:

[IDE message - 3:07:29]
An error occurred.
src\b4j\example\b4xmainpage.java:4: error: package com.sun.jna.platform.win32 does not exist
import com.sun.jna.platform.win32.User32;
^
Note: src\b4j\example\main.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
only showing the first 1 errors, of 8 total; use -Xmaxerrs if you would like to see more

javac 19.0.2

 

[teddybear]

You need these jars

#AdditionalJar:jna-5.14.0.jar
#AdditionalJar:jna-platform-5.14.0.jar

 

[Cableguy]

ok, thanks, but were do I find them?

I found the .jar files online, seems to work OK.

 

[Cableguy]

The code logs the values, but how do I retrieve them so I can use them? My Java knowledge is almost limited to copy/paste

 

[teddybear]

The code logs the values, but how do I retrieve them so I can use them? My Java knowledge is almost limited to copy/paste

The simplest way is to return a JSON string and then put them into a map.

Sub Button1_Click
    Dim jo As JavaObject=Me
    Dim s As String=jo.RunMethod("taskbar",Null)
    Dim m As Map=s.As(JSON).ToMap
    Log(m)
End Sub

#if java
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.RECT;
import com.sun.jna.platform.win32.WinDef.HWND;
    public static String taskbar() {
        User32 user32 = User32.INSTANCE;
        HWND hWnd = user32.FindWindow("Shell_TrayWnd", null);
        if (hWnd != null) {
            RECT rect = new RECT();
            user32.GetWindowRect(hWnd, rect);
            int x = rect.left;
            int y = rect.top;
            int width = rect.right - rect.left;
            int height = rect.bottom - rect.top;
            return "{\"x\":"+x+",\"y\":"+y+",\"w\":"+width+",\"h\":"+height+"}";
        }
        return null;
    }
#End If