图像处理业务逻辑CImageLibrary类(C/S框架网开源)

  图像处理业务逻辑CImageLibrary类(C/S框架网开源)



图像处理业务逻辑CImageLibrary类

C# Code:

/// <summary>
/// 图片处理
/// </summary>
public class CImageLibrary
{
  
  /// <summary>
  /// 检查图片返回的结果
  /// </summary>
   public enum ValidateImageResult { OK, InvalidFileSize, InvalidImageSize }
  
  /// <summary>
  /// 检查图片文件大小
  /// </summary>
  /// <param name="file">图片文件</param>
  /// <param name="MAX_FILE_SIZE">最大文件大小</param>
  /// <param name="MAX_WIDTH">最大宽度</param>
  /// <param name="MAX_HEIGHT">最大高度</param>
  /// <returns>返回检查结果</returns>
   public static ValidateImageResult ValidateImage(string file, int MAX_FILE_SIZE, int MAX_WIDTH, int MAX_HEIGHT)
  {
    byte[] bs = File.ReadAllBytes(file);
    double size = (bs.Length / 1024);
    
    //大于50KB
     if (size > MAX_FILE_SIZE) return ValidateImageResult.InvalidFileSize;
    
    Image img = null;
    try
    {
      img = Image.FromFile(file);
      if (img.Width > MAX_WIDTH || img.Height > MAX_HEIGHT)
      return ValidateImageResult.InvalidImageSize;
      else
      return ValidateImageResult.OK;
    }
    finally
    {
      img.Dispose();
    }
  }
  
  /// <summary>
  /// 按宽度比例缩小图片
  /// </summary>
  /// <param name="imgSource">原始图片</param>
  /// <param name="MAX_WIDTH">最大宽度</param>
  /// <returns></returns>
   public static Image ResizeImage(Image imgSource, int MAX_WIDTH, int MAX_HEIGHT)
  {
    Image imgOutput = imgSource;
    
    Size size = new Size(0, 0); //用于存储按比例计算后的宽和高参数
    
    if (imgSource.Width <= 3 || imgSource.Height <= 3) return imgSource; //3X3大小的图片不转换
    
    //按宽度缩放图片
     if (imgSource.Width > MAX_WIDTH) //计算宽度
     {
    double rate = MAX_WIDTH / (double)imgSource.Width; //计算宽度比例因子
    
    size.Width = Convert.ToInt32(imgSource.Width * rate);
    size.Height = Convert.ToInt32(imgSource.Height * rate);
    imgOutput = imgSource.GetThumbnailImage(size.Width, size.Height, null, IntPtr.Zero);
  }
  
  //按高度缩放图片
   if (imgOutput.Height > MAX_HEIGHT)//计算高度
   {
  double rate = MAX_HEIGHT / (double)imgOutput.Height; //计算宽度比例因子
  
  size.Width = Convert.ToInt32(imgOutput.Width * rate);
  size.Height = Convert.ToInt32(imgOutput.Height * rate);
  imgOutput = imgSource.GetThumbnailImage(size.Width, size.Height, null, IntPtr.Zero);
}

return imgOutput;
}

/// <summary>
/// 图片转换为数组
/// </summary>
/// <param name="imageFileName">图片文件</param>
/// <returns></returns>
public static byte[] GetImageBytes(string imageFileName, ImageFormat format)
{
Image img = Image.FromFile(imageFileName);
byte[] bs = GetImageBytes(img, format);
img.Dispose();
return bs;
}

/// <summary>
/// 图片转换为数组
/// </summary>
/// <param name="img">图片实例</param>
/// <returns></returns>
public static byte[] GetImageBytes(Image img, ImageFormat format)
{
if (img == null) return null;
MemoryStream ms = new MemoryStream();
try
{
  Bitmap bmp = new Bitmap(img);
  bmp.Save(ms, format);
  byte[] bs = ms.ToArray();
  ms.Close();
  return bs;
}
catch { ms.Close(); return null; }
}

/// <summary>
/// 数组转换为图片
/// </summary>.
/// <param name="bs">数组</param>
/// <returns></returns>
public static Image FromBytes(byte[] bs)
{
if (bs == null) return null;
MemoryStream ms = null;
try
{
  ms = new MemoryStream(bs);
  Image returnImage = Image.FromStream(ms);
  return returnImage;
  
}
catch { if (ms != null)ms.Close(); return null; }
}

/// <summary>
/// 转换为BMP格式
/// </summary>
/// <param name="source">原图</param>
/// <returns>返回BMP格式的图片</returns>
public static Image ToBMP(Image source, string outFileName)
{
try
{
  source.Save(outFileName, ImageFormat.Bmp);
}
catch (Exception ex)
{
  throw new Exception("原图文件流可能已关闭！\r\n" + ex.Message);
}

if (source.RawFormat == ImageFormat.Bmp)
{
  return source as Bitmap; //BMP格式不需要转换
   }
  
  return Image.FromFile(outFileName);//加载存储的BMP文件.
  
}

/// <summary>
/// 转换为JPG格式
/// </summary>
/// <param name="source">原图</param>
/// <returns>返回JPG格式的图片</returns>
public static Image ToJPG(Image source, string outFileName)
{
  try
  {
    source.Save(outFileName, ImageFormat.Jpeg);
  }
  catch (Exception ex)
  {
    throw new Exception("原图文件流可能已关闭！\r\n" + ex.Message);
  }
  
  if (source.RawFormat == ImageFormat.Jpeg)
  {
    return source as Bitmap; //BMP格式不需要转换
     }
    
    return Image.FromFile(outFileName);//加载存储的BMP文件.
    
  }
  
  /// <summary>
  /// 转换为PNG格式
  /// </summary>
  /// <param name="source">原图</param>
  /// <returns>返回PNG格式的图片</returns>
   public static Image ToPNG(Image source, string outFileName)
  {
    try
    {
      source.Save(outFileName, ImageFormat.Png);
    }
    catch (Exception ex)
    {
      throw new Exception("原图文件流可能已关闭！\r\n" + ex.Message);
    }
    
    if (source.RawFormat == ImageFormat.Png)
    {
      return source as Bitmap; //BMP格式不需要转换
       }
      
      return Image.FromFile(outFileName);//加载存储的BMP文件.
      
    }
    
    /// <summary>
    /// 获取1x1像素的空图片
    /// </summary>
    /// <returns></returns>
     public static byte[] GetEmptyImageByte()
    {
      Bitmap bmp = new Bitmap(1, 1);
      return GetImageBytes(bmp, ImageFormat.Jpeg);
    }
    
  }
  
  //来源:C/S框架网 | www.csframework.com | QQ:23404761

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