图片处理通用类代码,Asp.Net代码库,德仔网

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【Asp.Net】图片处理通用类
作者:dezai / 发布于2014/7/23/ 594

	using System;
	using System.IO;
	using System.Text;

	/// <summary>
	/// 图形转换处理类
	/// </summary>
	public class ImageOperator
	{
	 public ImageOperator()
	 {
	 }

	 /// <summary>
	 /// 获取一个图片按等比例缩小后的大小。
	 /// </summary>
	 /// <param name="maxWidth">需要缩小到的宽度</param>
	 /// <param name="maxHeight">需要缩小到的高度</param>
	 /// <param name="imageOriginalWidth">图片的原始宽度</param>
	 /// <param name="imageOriginalHeight">图片的原始高度</param>
	 /// <returns>返回图片按等比例缩小后的实际大小</returns>
	 public static Size GetNewSize(int maxWidth, int maxHeight, int imageOriginalWidth, int imageOriginalHeight)
	 {
	 double w = 0.0;
	 double h = 0.0;
	 double sw = Convert.ToDouble(imageOriginalWidth);
	 double sh = Convert.ToDouble(imageOriginalHeight); double mw = Convert.ToDouble(maxWidth);
	 double mh = Convert.ToDouble(maxHeight);

	 if (sw < mw && sh < mh)
	 {
	 w = sw;
	 h = sh;
	 }
	 else if ((sw / sh) > (mw / mh))
	 {
	 w = maxWidth;
	 h = (w * sh) / sw;
	 }
	 else
	 {
	 h = maxHeight;
	 w = (h * sw) / sh;
	 }

	 return new Size(Convert.ToInt32(w), Convert.ToInt32(h));
	 }

	 /// <summary>
	 /// 对给定的一个图片（Image对象）生成一个指定大小的缩略图。
	 /// </summary>
	 /// <param name="originalImage">原始图片</param>
	 /// <param name="thumMaxWidth">缩略图的宽度</param>
	 /// <param name="thumMaxHeight">缩略图的高度</param>
	 /// <returns>返回缩略图的Image对象</returns>
	 public static System.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, int thumMaxWidth, int thumMaxHeight)
	 {
	 Size thumRealSize = Size.Empty;
	 System.Drawing.Image newImage = originalImage;
	 Graphics graphics = null;

	 try
	 {
	 thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height);
	 newImage = new Bitmap(thumRealSize.Width, thumRealSize.Height);
	 graphics = Graphics.FromImage(newImage);

	 graphics.CompositingQuality = CompositingQuality.HighQuality;
	 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
	 graphics.SmoothingMode = SmoothingMode.HighQuality;

	 graphics.Clear(Color.Transparent);

	 graphics.DrawImage(originalImage, new Rectangle(0, 0, thumRealSize.Width, thumRealSize.Height), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
	 }
	 catch { }
	 finally
	 {
	 if (graphics != null)
	 {
	 graphics.Dispose();
	 graphics = null;
	 }
	 }

	 return newImage;
	 }
	 /// <summary>
	 /// 对给定的一个图片文件生成一个指定大小的缩略图。
	 /// </summary>
	 /// <param name="originalImage">图片的物理文件地址</param>
	 /// <param name="thumMaxWidth">缩略图的宽度</param>
	 /// <param name="thumMaxHeight">缩略图的高度</param>
	 /// <returns>返回缩略图的Image对象</returns>
	 public static System.Drawing.Image GetThumbNailImage(string imageFile, int thumMaxWidth, int thumMaxHeight)
	 {
	 System.Drawing.Image originalImage = null;
	 System.Drawing.Image newImage = null;

	 try
	 {
	 originalImage = System.Drawing.Image.FromFile(imageFile);
	 newImage = GetThumbNailImage(originalImage, thumMaxWidth, thumMaxHeight);
	 }
	 catch { }
	 finally
	 {
	 if (originalImage != null)
	 {
	 originalImage.Dispose();
	 originalImage = null;
	 }
	 }

	 return newImage;
	 }
	 /// <summary>
	 /// 对给定的一个图片文件生成一个指定大小的缩略图，并将缩略图保存到指定位置。
	 /// </summary>
	 /// <param name="originalImageFile">图片的物理文件地址</param>
	 /// <param name="thumbNailImageFile">缩略图的物理文件地址</param>
	 /// <param name="thumMaxWidth">缩略图的宽度</param>
	 /// <param name="thumMaxHeight">缩略图的高度</param>
	 public static void MakeThumbNail(string originalImageFile, string thumbNailImageFile, int thumMaxWidth, int thumMaxHeight)
	 {
	 System.Drawing.Image newImage = GetThumbNailImage(originalImageFile, thumMaxWidth, thumMaxHeight);
	 try
	 {
	 newImage.Save(thumbNailImageFile, ImageFormat.Jpeg);
	 }
	 catch
	 { }
	 finally
	 {
	 newImage.Dispose();
	 newImage = null;
	 }
	 }
	 /// <summary>
	 /// 将一个图片的内存流调整为指定大小，并返回调整后的内存流。
	 /// </summary>
	 /// <param name="originalImageStream">原始图片的内存流</param>
	 /// <param name="newWidth">新图片的宽度</param>
	 /// <param name="newHeight">新图片的高度</param>
	 /// <returns>返回调整后的图片的内存流</returns>
	 public static MemoryStream ResizeImage(Stream originalImageStream, int newWidth, int newHeight)
	 {
	 MemoryStream newImageStream = null;

	 System.Drawing.Image newImage = Globals.GetThumbNailImage(System.Drawing.Image.FromStream(originalImageStream), newWidth, newHeight);
	 if (newImage != null)
	 {
	 newImageStream = new MemoryStream();
	 newImage.Save(newImageStream, ImageFormat.Jpeg);
	 }

	 return newImageStream;
	 }
	 /// <summary>
	 /// 将一个内存流保存为磁盘文件。
	 /// </summary>
	 /// <param name="stream">内存流</param>
	 /// <param name="newFile">目标磁盘文件地址</param>
	 public static void SaveStreamToFile(Stream stream, string newFile)
	 {
	 if (stream == null || stream.Length == 0 || string.IsNullOrEmpty(newFile))
	 {
	 return;
	 }

	 byte[] buffer = new byte[stream.Length];
	 stream.Position = 0;
	 stream.Read(buffer, 0, buffer.Length);
	 FileStream fileStream = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write);
	 fileStream.Write(buffer, 0, buffer.Length);
	 fileStream.Flush();
	 fileStream.Close();
	 fileStream.Dispose();
	 }
	 /// <summary>
	 /// 对一个指定的图片加上图片水印效果。
	 /// </summary>
	 /// <param name="imageFile">图片文件地址</param>
	 /// <param name="waterImage">水印图片（Image对象）</param>
	 public static void CreateImageWaterMark(string imageFile, System.Drawing.Image waterImage)
	 {
	 if (string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null)
	 {
	 return;
	 }

	 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);

	 if (originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height)
	 {
	 return;
	 }

	 Graphics graphics = Graphics.FromImage(originalImage);

	 int x = originalImage.Width - waterImage.Width - 10;
	 int y = originalImage.Height - waterImage.Height - 10;
	 int width = waterImage.Width;
	 int height = waterImage.Height;

	 graphics.DrawImage(waterImage, new Rectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
	 graphics.Dispose();

	 MemoryStream stream = new MemoryStream();
	 originalImage.Save(stream, ImageFormat.Jpeg);
	 originalImage.Dispose();

	 System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);

	 imageWithWater.Save(imageFile);
	 imageWithWater.Dispose();
	 }
	 /// <summary>
	 /// 对一个指定的图片加上文字水印效果。
	 /// </summary>
	 /// <param name="imageFile">图片文件地址</param>
	 /// <param name="waterText">水印文字内容</param>
	 public static void CreateTextWaterMark(string imageFile, string waterText)
	 {
	 if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile))
	 {
	 return;
	 }

	 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);

	 Graphics graphics = Graphics.FromImage(originalImage);

	 graphics.SmoothingMode = SmoothingMode.HighQuality;
	 graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
	 graphics.CompositingQuality = CompositingQuality.HighQuality;
	 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

	 SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
	 Font waterTextFont = new Font("Arial", 16, FontStyle.Regular);
	 SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont);

	 float x = (float)originalImage.Width - waterTextSize.Width - 10F;
	 float y = (float)originalImage.Height - waterTextSize.Height - 10F;

	 graphics.DrawString(waterText, waterTextFont, brush, x, y);

	 graphics.Dispose();
	 brush.Dispose();

	 MemoryStream stream = new MemoryStream();
	 originalImage.Save(stream, ImageFormat.Jpeg);
	 originalImage.Dispose();

	 System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);

	 imageWithWater.Save(imageFile);
	 imageWithWater.Dispose();
	 }

	 /// <summary>
	 /// 判断上传组件是否包含内容。
	 /// </summary>
	 /// <param name="fileUpload">ASP.NET 2.0标准上传组件</param>
	 /// <returns>如果数据有效，则返回True，否则返回False</returns>
	 public static bool IsAttachmentValid(FileUpload fileUpload)
	 {
	 if (fileUpload != null &&
	 fileUpload.PostedFile != null &&
	 !string.IsNullOrEmpty(fileUpload.PostedFile.FileName) &&
	 fileUpload.PostedFile.ContentLength > 0)
	 {
	 return true;
	 }
	 return false;
	 }

	 /// <summary>
	 /// 将 Stream 转成 byte[]
	 /// </summary>
	 public byte[] StreamToBytes(Stream stream)
	 {
	 byte[] bytes = new byte[stream.Length];
	 stream.Read(bytes, 0, bytes.Length);
	 // 设置当前流的位置为流的开始
	 stream.Seek(0, SeekOrigin.Begin);
	 return bytes;
	 }

	 /// <summary>
	 /// 将 byte[] 转成 Stream
	 /// </summary>
	 public Stream BytesToStream(byte[] bytes)
	 {
	 Stream stream = new MemoryStream(bytes);
	 return stream;
	 }

	 /// <summary>
	 /// 将 string 转 byte[]
	 /// </summary>
	 /// <param name="str"></param>
	 /// <returns></returns>
	 public byte[] StringToBytes(string inputString)
	 {
	 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
	 byte[] inputBytes = converter.GetBytes(inputString);
	 return inputBytes;
	 }

	 /// <summary>
	 /// 将 byte[] 转 string
	 /// </summary>
	 /// <param name="bytes"></param>
	 /// <returns></returns>
	 public string BytesToString(byte[] inputBytes)
	 {
	 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
	 string inputString = converter.GetString(inputBytes);
	 return inputString;
	 }

	 /// <summary>
	 /// 将 string 转 byte[] FromBase64
	 /// </summary>
	 /// <param name="str"></param>
	 /// <returns></returns>
	 public byte[] StringToBytesFromBase64(string inputString)
	 {
	 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
	 byte[] inputBytes = System.Convert.FromBase64String(inputString);
	 return inputBytes;

	 }

	 /// <summary>
	 /// 将 byte[] 转 string FromBase64
	 /// </summary>
	 /// <param name="bytes"></param>
	 /// <returns></returns>
	 public string BytesToStringFromBase64(byte[] inputBytes)
	 {
	 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
	 string inputString = System.Convert.ToBase64String(inputBytes);
	 return inputString;
	 }

	}
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