/// <summary>
/// 压缩图片
/// </summary>
/// <param name="iSource">图片文件</param>
/// <param name="outPath">路径</param> 例如 var outPath = Path.Combine(Request.MapPath("~/Upload"), Path.GetFileName(file.FileName));
/// <param name="flag">值越大代表图片质量越好,一般默认控制在50为最佳压缩质量</param>
/// <returns></returns>
public static bool ReduceImage(Image iSource, string outPath, int flag)
{
ImageFormat tFormat = iSource.RawFormat;
EncoderParameters ep = new EncoderParameters();
long[] qy = new long[1];
qy[0] = flag;
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
ep.Param[0] = eParam;
try
{
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageDecoders();
ImageCodecInfo jpegICIinfo = null;
for (int x = 0; x < arrayICI.Length; x++)
{
if (arrayICI[x].FormatDescription.Equals("JPEG"))
{
jpegICIinfo = arrayICI[x];
break;
}
}
if (jpegICIinfo != null)
iSource.Save(outPath, jpegICIinfo, ep);
else
iSource.Save(outPath, tFormat);
return true;
}
catch
{
return false;
}
finally
{
iSource.Dispose();
}
}
图片类型转换
/// <summary>
///byte[] 图片转换
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static Image BytesToImage(byte[] buffer)
{
MemoryStream ms = new MemoryStream(buffer);
Image image = System.Drawing.Image.FromStream(ms);
return image;
}
/// <summary>
/// 使用流方式,上传并保存文件
/// </summary>
/// <param name="s">文件流</param>
/// <param name="savepath">保存文件路径</param>
/// <param name="warning">处理警告信息,若为空,则处理成功</param>
/// <returns>返回文件保存完整路径</returns>
public static string uploadbystream(Stream s, string savepathFolder, out string warning)
{
try
{
int be = 0;
if (s.Length > 0)
{
MemoryStream ms = new MemoryStream(); while ((be = s.ReadByte()) != -1)
{
ms.WriteByte((byte)be);
}
string reletiveFolder = "UploadFile\\ManageImage\\" + savepathFolder + "\\" + DateTime.Now.Year + "\\" + DateTime.Now.Month;
string folderPath = HttpContext.Current.Server.MapPath("~/") + reletiveFolder;
if (!Directory.Exists(folderPath))
Directory.CreateDirectory(folderPath);
string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
string newpath = folderPath + "\\" + filename; string lastpath = "";
lastpath = newpath;
//FileExistMapPath(newpath, FileCheckModel.M, out lastpath); FileStream fs = new FileStream(lastpath, FileMode.Create); ms.WriteTo(fs); //释放
ms.Dispose();
fs.Dispose(); warning = "";
return reletiveFolder + "\\" + filename;
} warning = "error";
return "";
}
catch (Exception ex)
{
warning = "error" + ex.Message;
return "";
}
}