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分享一个项目中在用的图片处理工具类(图片缩放,旋转,画布格式,字节,image,bitmap转换等)

using System; using System.Collections.Generic; using System.IO; using System.Text; using System.Drawing; using System.Drawing.Drawing2D; using System.Threading;  namespace ConfigLab.Comp.Img.ImgUtils {     /// <summary>     /// 功能简介:图片转换类     /// 创建时间:2016-9-10     /// 创建人:pcw     /// 博客:http://www.cnblogs.com/taohuadaozhu     /// </summary>     public class ImgConvert     {         /// <summary>         /// 字节数组转换为bitmap         /// </summary>         /// <param name="buffer"></param>         /// <returns></returns>         public static Bitmap BytesToBitmap(byte[] buffer)         {             Bitmap bitmapResult = null;             if (buffer != null && buffer.Length > 0)             {                 using (MemoryStream ms = new MemoryStream(buffer))                 {                     try                     {                         bitmapResult = new Bitmap(ms);                         return bitmapResult;                     }                     catch (Exception error)                     {                         return bitmapResult;                     }                     finally                     {                         ms.Close();                         ms.Dispose();                     }                 }             }             return null;         }         /// <summary>         /// 字节数组转换为Image对象         /// </summary>         /// <param name="buffer"></param>         /// <returns></returns>         public static Image BytesToImage(byte[] buffer)         {             if (buffer != null && buffer.Length > 0)             {                 using (MemoryStream ms = new MemoryStream(buffer))                 {                     Image image = null;                     try                     {                         image = Image.FromStream(ms);                         return image;                     }                     catch (Exception error)                     {                         return image;                     }                     finally                     {                         ms.Close();                         ms.Dispose();                     }                 }             }             return null;          }          /// <summary>         /// 按照一定的比率进行放大或缩小         /// </summary>         /// <param name="Percent">缩略图的宽度百分比 如:需要百分之80,就填0.8</param>          /// <param name="rotateFlipType">         ///顺时针旋转90度     RotateFlipType.Rotate90FlipNone         ///逆时针旋转90度     RotateFlipType.Rotate270FlipNone         ///水平翻转           RotateFlipType.Rotate180FlipY         ///垂直翻转          RotateFlipType.Rotate180FlipX         ///保持原样           RotateFlipType.RotateNoneFlipNone         /// </param>         /// <param name="IsTransparent">背景是否透明</param>         /// <returns>Bitmap对象</returns>         public static Bitmap GetImage_Graphics(Image ResourceImage, double Percent, RotateFlipType rotateFlipType, bool IsTransparent)         {             Bitmap ResultBmp = null;             try             {                 if (ResourceImage != null)                 {                     ResourceImage.RotateFlip(rotateFlipType);                     int _newWidth = (int)Math.Round(ResourceImage.Width * Percent);                     int _newHeight = (int)Math.Round(ResourceImage.Height * Percent);                     ResultBmp = new System.Drawing.Bitmap(_newWidth, _newHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);//创建图片对象                     Graphics g = null;                     try                     {                         g = Graphics.FromImage(ResultBmp);//创建画板并加载空白图像                         if (g != null)                         {                             g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor; //System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;//设置保真模式为高度保真                             g.DrawImage(ResourceImage, new Rectangle(0, 0, _newWidth, _newHeight), 0, 0, ResourceImage.Width, ResourceImage.Height, GraphicsUnit.Pixel);//开始画图                             if (IsTransparent)                             {                                 ResultBmp.MakeTransparent(System.Drawing.Color.Transparent);                             }                         }                     }                     catch (Exception errr)                     {                         ConfigLab.Utils.SaveErrorLog(string.Format("GetImage_Graphics(1),异常={0}", errr.Message));                         Thread.Sleep(100);                     }                     finally                     {                         if (g != null)                         {                             g.Dispose();                         }                     }                 }             }             catch (Exception ex)             {                 ConfigLab.Utils.SaveErrorLog(string.Format("GetImage_Graphics(2),异常={0}", ex.Message));                 Thread.Sleep(100);                 return null;             }             finally             {                 if (ResourceImage != null)                 {                     ResourceImage.Dispose();                 }             }             return ResultBmp;         }         /// <summary>         /// 图片等比缩放         /// </summary>         /// <param name="sImgFilePath"></param>         /// <param name="Percent"></param>         /// <returns></returns>         public static bool ChangeImgSize(string sImgFilePath, double Percent,string sNewImgFilePath)         {             Image img = null;             Bitmap bp = null;             bool bSuccess = false;             try             {                 if (File.Exists(sImgFilePath) == false)                 {                     Utils.SaveErrorLog(string.Format("找不到待压缩的原文件{0}", sImgFilePath));                     return false;                 }                 img = Image.FromFile(sImgFilePath);                 if (img != null)                 {                     bp = GetImage_Graphics(img, Percent, RotateFlipType.RotateNoneFlipNone, true);                     if (bp != null)                     {                         string sDirectory = FilePathUtils.getDirectory(sNewImgFilePath);                         if (sDirectory.EndsWith("\") == false)                         {                             sDirectory = string.Format("{0}\", sDirectory);                         }                         bp.Save(sNewImgFilePath);                         bSuccess=true;                     }                 }             }             catch(Exception ex)             {                 Utils.SaveErrorLog(string.Format("ChangeImgSize处理{0}的图片且保存到{1}的任务执行失败",sImgFilePath,sNewImgFilePath), ex);             }             finally             {                 if (img != null)                 {                     img.Dispose();                 }                 if (bp != null)                 {                     bp.Dispose();                 }             }             return bSuccess;         }         /// <summary>         /// Resize图片         /// </summary>         /// <param name="bmp">原始Bitmap</param>         /// <param name="newW">新的宽度</param>         /// <param name="newH">新的高度</param>         /// <returns>处理以后的Bitmap</returns>         public static Bitmap ResizeBmp(Bitmap bmp, int newW, int newH)         {             try             {                 Bitmap b = new Bitmap(newW, newH);                 Graphics g = Graphics.FromImage(b);                 g.SmoothingMode = SmoothingMode.HighSpeed;                 g.CompositingQuality = CompositingQuality.HighSpeed;                 g.InterpolationMode = InterpolationMode.Low;                 g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);                 g.Dispose();                  return b;             }             catch             {                 return null;             }         }          /// 将图片Image转换成Byte[]         /// </summary>         /// <param name="Image">image对象</param>         /// <param name="imageFormat">后缀名</param>         /// <returns></returns>         public static byte[] ImageToBytes(Image Image, System.Drawing.Imaging.ImageFormat imageFormat)         {             if (Image == null) { return null; }             byte[] data = null;             using (MemoryStream ms = new MemoryStream())             {                 using (Bitmap Bitmap = new Bitmap(Image))                 {                     Bitmap.Save(ms, imageFormat);                     ms.Position = 0;                     data = new byte[ms.Length];                     ms.Read(data, 0, Convert.ToInt32(ms.Length));                     ms.Flush();                 }             }             return data;         }          /// <summary>         /// 通过FileStream 来打开文件,这样就可以实现不锁定Image文件,到时可以让多用户同时访问Image文件         /// </summary>         /// <param name="path"></param>         /// <returns></returns>         public static Bitmap ReadImageFile(string path)         {             if (string.IsNullOrEmpty(path))                 return null;             if (File.Exists(path) == false)                 return null;             int filelength = 0;             Bitmap bit = null;             Byte[] image = null;             try             {                 using (FileStream fs = File.OpenRead(path))//OpenRead                 {                     filelength = (int)fs.Length; //获得文件长度                      image = new Byte[filelength]; //建立一个字节数组                      fs.Read(image, 0, filelength); //按字节流读取                      System.Drawing.Image result = System.Drawing.Image.FromStream(fs);                     bit = new Bitmap(result);                     if (fs != null)                     {                         fs.Close();                         fs.Dispose();                     }                 }             }             catch (Exception err)             {                 ConfigLab.Utils.SaveErrorLog(string.Format("读取图片【{0}】失败,调试信息={1}", path, err.Message + err.StackTrace));             }             finally             {                 if (image != null)                 {                     image = null;                 }             }             return bit;         }     } }

 

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未经允许不得转载:张拓的天空 » 分享一个项目中在用的图片处理工具类(图片缩放,旋转,画布格式,字节,image,bitmap转换等)
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