83 lines
3.0 KiB
C#
83 lines
3.0 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Drawing;
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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 ZWL.Common
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{
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public class ImgUtil
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{
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#region base64转换为图片并返回图片路径
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public static string ConvertImg(string strBase)
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{
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var base64 = strBase.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "").Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");//将base64头部信息替换
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byte[] bytes = Convert.FromBase64String(base64);
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MemoryStream memStream = new MemoryStream(bytes);
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Image mImage = Image.FromStream(memStream);
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//Bitmap bp = new Bitmap(mImage);
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Bitmap bp = PercentImage(mImage);
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MemoryStream ms = new MemoryStream();
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string strPhotoPath = ConfigurationManager.AppSettings["Photo"].ToString();
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if (!Directory.Exists(strPhotoPath))
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{
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DirectoryInfo directoryInfo = new DirectoryInfo(strPhotoPath);
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directoryInfo.Create();
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}
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strPhotoPath += "\\" + Guid.NewGuid().ToString() + ".jpg";
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bp.Save(strPhotoPath, System.Drawing.Imaging.ImageFormat.Jpeg);
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return strPhotoPath;
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}
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/// <summary>
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/// 压缩图片，宽度最大为1200
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/// 2023-11-29 xulu
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/// </summary>
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/// <param name="srcImage"></param>
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/// <returns></returns>
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public static Bitmap PercentImage(System.Drawing.Image srcImage)
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{
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int newW = srcImage.Width < 1200 ? srcImage.Width : 1200;
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int newH = int.Parse(Math.Round(srcImage.Height * (double)newW / srcImage.Width).ToString());
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try
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{
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Bitmap b = new Bitmap(newW, newH);
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Graphics g = Graphics.FromImage(b);
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g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
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g.DrawImage(srcImage, new System.Drawing.Rectangle(0, 0, newW, newH), new System.Drawing.Rectangle(0, 0, srcImage.Width, srcImage.Height), GraphicsUnit.Pixel);
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g.Dispose();
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return b;
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}
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catch (Exception)
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{
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return null;
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}
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}
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#endregion
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#region 图片文件转base64
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public static string DocumentToBase64Str(string fileName)
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{
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try
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{
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FileStream filestream = new FileStream(fileName, FileMode.Open);
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byte[] bt = new byte[filestream.Length];
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//调用read读取方法
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filestream.Read(bt, 0, bt.Length);
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string base64Str = Convert.ToBase64String(bt);
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filestream.Close();
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return base64Str;
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}
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catch (Exception ex)
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{
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return "";
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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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