I'm trying to set the Windows Cursor to a random one from an array named cursorOptions which holds the values for each cursor type.
int[] cursorOptions = new int[]{32650, 32515, 32649, 32651, 32513, 32648, 32646, 32643, 32645, 32642, 32644, 32516, 32514, 32512};
I'm using the SetCursor(WinDef.LONG hcur) JNA method (found on line 1157 at: https://github.com/br45entei/SWT-Win32-Extension/blob/master/src/org/sf/feeling/swt/win32/extension/jna/win32/User32.java) but have no idea what value I should put for hcur. I tried to send the new cursor value from the array but that evaluated to false.
WinDef.LONG u = new WinDef.LONG(cursorOptions[rand.nextInt(cursorOptions.length-1)]);
user32.SetCursor(u);
user32.ShowCursor(true);
Next, I tried to assign the hashCode value of different cursor values (65541 for the IBar cursor) which evaluated to true but that didn't change the cursor value.
WinDef.LONG g = new WinDef.LONG(65541);
user32.SetCursor(g);
user32.ShowCursor(true);
What value of hcur is expected to change the cursor? Why does the hashCode value of a cursor evaluate as true yet not change the cursor when sent in SetCursor(WinDef.LONG hcur)?
Full Code:
import com.sun.jna.Native;
import com.sun.jna.Structure;
import com.sun.jna.platform.win32.WinDef;
import com.sun.jna.win32.W32APIOptions;
import java.awt.*;
import java.util.*;
import java.util.List;
import java.util.concurrent.TimeUnit;
class MouseManipulation {
private User32 user32;
MouseManipulation() {
user32 = User32.INSTANCE;
}
/**
* @return cursorInfo.hCursor Returns the HCURSOR of the cursor on screen
*/
WinDef.HCURSOR getCurrentCursor(){
CursorInfo cursorInfo = new CursorInfo();
this.user32.GetCursorInfo(cursorInfo);
return cursorInfo.hCursor;
}
/*
* Set the cursor to be a random cursor within the defined scope of cursorOptions
*/
void ChangeMouseCursor() {
try {
int[] cursorOptions = new int[]{32650, 32515, 32649, 32651, 32513, 32648, 32646, 32643, 32645, 32642, 32644, 32516, 32514, 32512};
Random rand = new Random();
WinDef.HCURSOR hc = getCurrentCursor();
System.out.println("The HCURSOR: "+hc.toString());
System.out.println("The HCURSOR hashCode: "+hc.hashCode());
//I want this to randomly pick from the Array of cursor values and set that as the newest cursor icon
//but I have no clue what value for WinDef.LONG should be
WinDef.LONG u = new WinDef.LONG(cursorOptions[rand.nextInt(cursorOptions.length-1)]);
user32.SetCursor(u);
user32.ShowCursor(true);
System.out.println("When using the array: "+user32.SetCursor(u));
//This evaluates to true yet doesn't change the cursor icon on screen;
//for instance 65541 is the hashCode for IBar and when cursor is NormalPointer it doesn't change.
WinDef.LONG g = new WinDef.LONG(65541);
user32.SetCursor(g);
user32.ShowCursor(true);
System.out.println("When using the hashCode: "+user32.SetCursor(g));
}
//Sometimes the cursor won't be found so we catch the NullPointerException
catch (NullPointerException e){
e.printStackTrace();
}
}
/*
* Take advantage of the JNA 4.5.2 and the JNA 4.5.2 platform to interact with the Win32 API
*/
public interface User32 extends com.sun.jna.Library {
MouseManipulation.User32 INSTANCE = (MouseManipulation.User32) Native.loadLibrary("user32", MouseManipulation.User32.class, W32APIOptions.DEFAULT_OPTIONS);
boolean SetCursor(WinDef.LONG hcur);
int GetCursorInfo(CursorInfo cursorInfo);
int ShowCursor(boolean bShow);
}
/*
* This class was made to get the cursor's information such as its pointer and then later gets its hashCode value
Credits: deFreitas at: https://stackoverflow.com/questions/47634213/get-mouse-type-in-java-using-jna
*/
public static class CursorInfo extends Structure {
public int cbSize;//Access must be public
public int flags;
public WinDef.HCURSOR hCursor;//Access must be public
public WinDef.POINT ptScreenPos;
CursorInfo() {
this.cbSize = Native.getNativeSize(CursorInfo.class, null);
}
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("cbSize", "flags", "hCursor", "ptScreenPos");
}
}
}
Used Libraries:
compile group: 'net.java.dev.jna', name: 'jna', version: '4.5.2'
compile group: 'net.java.dev.jna', name: 'jna-platform', version: '4.5.2'
Calling:
final MouseManipulation mouse = new MouseManipulation();
mouse.ChangeMouseCursor();
Note: I want the windows cursor to change even if not on a java application so JFrame solutions and other such things are unwarranted.
I thank you in advance!