60 lines
2.2 KiB
C#
60 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Work
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{
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public class ImgConvertToIcon
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{
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#region 将图片缓存ico
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///
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///要转换为图标的Image对象
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///当image为null时是否返回null。false则抛空引用异常
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///
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public static Icon ConvertToIcon(Image image, bool nullTonull = false)
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{
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if (image == null)
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{
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if (nullTonull) { return null; }
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throw new ArgumentNullException("image");
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}
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using (MemoryStream msImg = new MemoryStream()
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, msIco = new MemoryStream())
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{
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image.Save(msImg, ImageFormat.Png);
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using (BinaryWriter bin = new BinaryWriter(msIco))
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{
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//写图标头部
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bin.Write((short)0); //0-1保留
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bin.Write((short)1); //2-3文件类型。1=图标, 2=光标
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bin.Write((short)1); //4-5图像数量（图标可以包含多个图像）
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bin.Write((byte)image.Width); //6图标宽度
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bin.Write((byte)image.Height); //7图标高度
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bin.Write((byte)0); //8颜色数（若像素位深>=8，填0。这是显然的，达到8bpp的颜色数最少是256，byte不够表示）
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bin.Write((byte)0); //9保留。必须为0
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bin.Write((short)0); //10-11调色板
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bin.Write((short)32); //12-13位深
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bin.Write((int)msImg.Length); //14-17位图数据大小
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bin.Write(22); //18-21位图数据起始字节
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//写图像数据
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bin.Write(msImg.ToArray());
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bin.Flush();
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bin.Seek(0, SeekOrigin.Begin);
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return new Icon(msIco);
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}
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}
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}
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#endregion
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}
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}
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