用Java提取光标图像

将光标类是相当抽象的-
所有重要的东西委托给本机代码，所以你不能只画上一个在图形上下文。尚无立即显而易见的方法来绕过预定义图标或在本机代码中进行 *** 作的需要。

您能帮我使用您提到的功能吗？

以下是一些使用JNA库绘制内置Windows光标的代码。如果可以使用JNA，则可以避免使用C
++编译器。

我可能打了太多本地电话，但是对于一次生成图标来说，花费并不大。

用Java
http://f.imagehost.org/0709/hand.png绘制的手形光标

将光标显示为Java图像的代码：

public class LoadCursor {  public static void draw(BufferedImage image, int cursor,      int diFlags) {    int width = image.getWidth();    int height = image.getHeight();    User32 user32 = User32.INSTANCE;    Gdi32 gdi32 = Gdi32.INSTANCE;    Pointer hIcon = user32        .LoadCursorW(Pointer.NULL, cursor);    Pointer hdc = gdi32.CreateCompatibleDC(Pointer.NULL);    Pointer bitmap = gdi32.CreateCompatibleBitmap(hdc,        width, height);    gdi32.SelectObject(hdc, bitmap);    user32.DrawIconEx(hdc, 0, 0, hIcon, width, height, 0,        Pointer.NULL, diFlags);    for (int x = 0; x < width; x++) {      for (int y = 0; y < width; y++) {        int rgb = gdi32.GetPixel(hdc, x, y);        image.setRGB(x, y, rgb);      }    }    gdi32.DeleteObject(bitmap);    gdi32.DeleteDC(hdc);  }  public static void main(String[] args) {    final int width = 128;    final int height = 128;    BufferedImage image = new BufferedImage(width, height,        BufferedImage.TYPE_INT_ARGB);    draw(image, User32.IDC_HAND, User32.DI_NORMAL);    BufferedImage mask = new BufferedImage(width, height,        BufferedImage.TYPE_INT_RGB);    draw(mask, User32.IDC_HAND, User32.DI_MASK);    applyMask(image, mask);    JLabel icon = new JLabel();    icon.setIcon(new ImageIcon(image));    Jframe frame = new Jframe();    frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);    frame.setContentPane(icon);    frame.pack();    frame.setVisible(true);  }  private static void applyMask(BufferedImage image,      BufferedImage mask) {    int width = image.getWidth();    int height = image.getHeight();    for (int x = 0; x < width; x++) {      for (int y = 0; y < height; y++) {        int masked = mask.getRGB(x, y);        if ((masked & 0x00FFFFFF) == 0) {          int rgb = image.getRGB(x, y);          rgb = 0xFF000000 | rgb;          image.setRGB(x, y, rgb);        }      }    }  }}

User32.dll接口：

public interface User32 extends Library {  public static User32 INSTANCE = (User32) Native      .loadLibrary("User32", User32.class);    public static final int IDC_ARROW = 32512;    public static final int IDC_IBEAM = 32513;    public static final int IDC_WAIT = 32514;    public static final int IDC_CROSS = 32515;    public static final int IDC_UPARROW = 32516;    public static final int IDC_SIZENWSE = 32642;    public static final int IDC_SIZENESW = 32643;    public static final int IDC_SIZEWE = 32644;    public static final int IDC_SIZENS = 32645;    public static final int IDC_SIZEALL = 32646;    public static final int IDC_NO = 32648;    public static final int IDC_HAND = 32649;    public static final int IDC_APPSTARTING = 32650;    public static final int IDC_HELP = 32651;    public static final int IDC_ICON = 32641;    public static final int IDC_SIZE = 32640;    public static final int DI_COMPAT = 4;    public static final int DI_DEFAULTSIZE = 8;    public static final int DI_IMAGE = 2;    public static final int DI_MASK = 1;    public static final int DI_NORMAL = 3;    public static final int DI_APPBANDING = 1;    public Pointer LoadCursorW(Pointer hInstance,      int lpCursorName);    public boolean DrawIconEx(Pointer hdc, int xLeft,      int yTop, Pointer hIcon, int cxWidth, int cyWidth,      int istepIfAniCur, Pointer hbrFlickerFreeDraw,      int diFlags);}

Gdi32.dll接口：

public interface Gdi32 extends Library {  public static Gdi32 INSTANCE = (Gdi32) Native      .loadLibrary("Gdi32", Gdi32.class);    public Pointer CreateCompatibleDC(Pointer hdc);    public Pointer CreateCompatibleBitmap(Pointer hdc,      int nWidth, int nHeight);    public Pointer SelectObject(Pointer hdc, Pointer hgdiobj);    public int SetPixel(Pointer hdc, int X, int Y, int crColor);    public int GetPixel(Pointer hdc, int nXPos, int nYPos);    public boolean DeleteObject(Pointer hObject);    public boolean DeleteDC(Pointer hdc);}