C\#jpg 미리 보기 함수 코드

 
/// <summary> 
///   jpg     ,              ，          ，      
///              ，           ^_^ 
/// </summary> 
/// <param name="originalImagePath">    </param> 
/// <param name="quality">  0-100</param> 
/// <param name="width">  </param> 
/// <param name="height">  </param> 
/// <param name="mode">  ：HW,W,H,Cut</param> 
/// <returns></returns> 
public static byte[] MakeJPGThumbnailBytes(string originalImagePath, long quality, int width, int height, string mode) 
{ 
Image originalImage = Image.FromFile(originalImagePath); 
MemoryStream s = new MemoryStream(); 
int towidth = width; 
int toheight = height; 

int x = 0; 
int y = 0; 
int ow = originalImage.Width; 
int oh = originalImage.Height; 

switch (mode) 
{ 
case "HW"://      （    ） 
break; 
case "W"://   ，     
toheight = originalImage.Height * width / originalImage.Width; 
break; 
case "H"://   ，     
towidth = originalImage.Width * height / originalImage.Height; 
break; 
case "Cut"://      （   ） 
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) 
{ 
oh = originalImage.Height; 
ow = originalImage.Height * towidth / toheight; 
y = 0; 
x = (originalImage.Width - ow) / 2; 
} 
else 
{ 
ow = originalImage.Width; 
oh = originalImage.Width * height / towidth; 
x = 0; 
y = (originalImage.Height - oh) / 2; 
} 
break; 
default: 
break; 
} 

//    bmp   
Image bitmap = new System.Drawing.Bitmap(towidth, toheight); 

//       
Graphics g = System.Drawing.Graphics.FromImage(bitmap); 

//         
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 

//     ,          
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 

//              
g.Clear(Color.Transparent); 

//                       
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), 
new Rectangle(x, y, ow, oh), 
GraphicsUnit.Pixel); 

try 
{ 
// jpg        
EncoderParameters eps = new EncoderParameters(1); 
EncoderParameter ep = new EncoderParameter(Encoder.Quality,quality); 
eps.Param[0] = ep; 
bitmap.Save(s, GetCodecInfo("image/jpeg"), eps); 
return s.GetBuffer(); 
} 
catch (System.Exception e) 
{ 
throw e; 
} 
finally 
{ 
originalImage.Dispose(); 
bitmap.Dispose(); 
s.Dispose(); 
g.Dispose(); 
} 
} 

/**/ 
/// <summary> 
///   JPG   
/// </summary> 
/// <param name="mimeType"></param> 
/// <returns>    mimeType ImageCodecInfo</returns> 
private static ImageCodecInfo GetCodecInfo(string mimeType) 
{ 
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders(); 
foreach (ImageCodecInfo ici in CodecInfo) 
{ 
if (ici.MimeType == mimeType) return ici; 
} 
return null; 
}