WPF 自定义鼠标指针图片

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//DllImport
using System.Runtime.InteropServices;
//SecurityPermission
using System.Security.Permissions;
//SafeHandleZeroOrMinusOneIsInvalid
using Microsoft.Win32.SafeHandles;
//Cursor
using System.Windows.Input;
//UIElement
using System.Windows;
//RenderTargetBitmap
using System.Windows.Media.Imaging;
//PixelFormats
using System.Windows.Media;
//MemoryStream
using System.IO;
//CursorInteropHelper
using System.Windows.Interop;
//Bitmap
using System.Drawing;
namespace _WPF自定义鼠标指针
{
public class CursorHelper
{
//公有：
//创建鼠标指针方法：
/// <summary>
/// 根据 BitmapImage 创建鼠标图标
/// </summary>
/// <param name="bs">鼠标图像</param>
/// <param name="xHotSpot">焦点在图片中的 X轴坐标(相对于左上角)</param>
/// <param name="yHotSpot">焦点在图片中的 Y轴坐标(相对于左上角)</param>
/// <returns>错误则返回null</returns>
public static Cursor CreateCursor(BitmapSource bs, uint xHotSpot = 0, uint yHotSpot = 0)
{
Cursor ret = null;
Bitmap bm = BitmapSource2Bitmap(bs);
if (bm != null)
{
try
{
ret = InternalCreateCursor(bm, xHotSpot, yHotSpot);
}
catch (Exception)
{
ret = null;
}
}
return ret;
}
/// <summary>
/// 根据本地文件路径创建鼠标图标
/// </summary>
/// <param name="filePath">鼠标图像全路径</param>
/// <param name="xHotSpot">焦点在图片中的 X轴坐标(相对于左上角)</param>
/// <param name="yHotSpot">焦点在图片中的 Y轴坐标(相对于左上角)</param>
/// <returns>错误则返回null</returns>
public static Cursor CreateCursor(String filePath, uint xHotSpot = 0, uint yHotSpot = 0)
{
Cursor ret = null;
if (string.IsNullOrWhiteSpace(filePath) || Directory.Exists(filePath) || !File.Exists(filePath))
{
return ret;
}
//首先尝试通过默认方法创建
if (filePath.EndsWith(".ani") || filePath.EndsWith(".cur"))
{
try
{
ret = new Cursor(filePath);
}
catch (Exception)
{
ret = null;
}
}
//如果文件不是正确的.ani或.cur文件，则尝试通过BitMap创建
if (ret == null)
{
Bitmap bmp = null;
try
{
bmp = Bitmap.FromFile(filePath) as Bitmap;
if (bmp != null)
{
ret = CreateCursor(bmp, xHotSpot, yHotSpot);
}
}
catch (Exception)
{
ret = null;
}
}
return ret;
}
/// <summary>
/// 根据 Bitmap 创建自定义鼠标
/// </summary>
/// <param name="bm">鼠标图像</param>
/// <param name="xHotSpot">焦点在图片中的 X轴坐标(相对于左上角)</param>
/// <param name="yHotSpot">焦点在图片中的 Y轴坐标(相对于左上角)</param>
/// <returns>错误则返回null</returns>
public static Cursor CreateCursor(Bitmap bm, uint xHotSpot = 0, uint yHotSpot = 0)
{
Cursor ret = null;
if (bm == null)
{
return ret;
}
try
{
ret = InternalCreateCursor(bm, xHotSpot, yHotSpot);
}
catch (Exception)
{
ret = null;
}
return ret;
}
//BitmapSource 转 Bitmap 方法
/// <summary>
/// BitmapSource 转 Bitmap
/// </summary>
/// <param name="bi"></param>
/// <returns>错误则返回null</returns>
public static Bitmap BitmapSource2Bitmap(BitmapSource bi)
{
Bitmap ret = null;
MemoryStream stream = null;
if (bi == null)
{
return ret;
}
try
{
stream = new MemoryStream();
BmpBitmapEncoder enc = new BmpBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(bi));
enc.Save(stream);
ret = new Bitmap(stream);
}
catch (Exception)
{
ret = null;
}
finally
{
stream.Dispose();
}
return ret;
}
//保护：
/// <summary>
/// 创建鼠标（本方法不允许public，避免内存泄漏）
/// </summary>
/// <param name="bitmap"></param>
/// <param name="xHotSpot"></param>
/// <param name="yHotSpot"></param>
/// <returns></returns>
protected static Cursor InternalCreateCursor(Bitmap bitmap, uint xHotSpot, uint yHotSpot)
{
var iconInfo = new NativeMethods.IconInfo;
NativeMethods.GetIconInfo(bitmap.GetHicon(), ref iconInfo);
iconInfo.xHotspot = xHotSpot;//焦点x轴坐标
iconInfo.yHotspot = yHotSpot;//焦点y轴坐标
iconInfo.fIcon = false;//设置鼠标
SafeIconHandle cursorHandle = NativeMethods.CreateIconIndirect(ref iconInfo);
return CursorInteropHelper.Create(cursorHandle);
}
protected static class NativeMethods
{
public struct IconInfo
{
public bool fIcon;
public uint xHotspot;
public uint yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
[DllImport("user32.dll")]
public static extern SafeIconHandle CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
public static extern bool DestroyIcon(IntPtr hIcon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
}
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
protected class SafeIconHandle : SafeHandleZeroOrMinusOneIsInvalid
{
public SafeIconHandle()
: base(true)
{
}
/// <summary>
/// 释放资源
/// </summary>
/// <returns></returns> 点击打开链接
protected override bool ReleaseHandle()
{
return NativeMethods.DestroyIcon(handle);
}
}
}
}
原文链接：https://blog.csdn.net/hjnth/article/details/56483935

WPF 自定义鼠标指针图片

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