/**/
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static MemoryStream MakeThumbnail(string originalImagePath, int width, int height, string mode)
{
WebClientX xx = new WebClientX();
System.Drawing.Image originalImage = new Bitmap(width, height);
try
{
FileInfo fi = new FileInfo(originalImagePath);
if (fi.Exists)
{
originalImage = System.Drawing.Image.FromStream(fi.OpenRead());
}
else
{
originalImage = Image.FromStream(xx.OpenRead(originalImagePath));
}
}
catch
{
originalImage = Image.FromStream(xx.OpenRead(originalImagePath));
}
System.IO.MemoryStream ms = new System.IO.MemoryStream();
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
if (ow < towidth && oh < toheight)
{
originalImage.Save(ms, ConvertImageFormat(originalImagePath));
}
else
{
switch (mode.ToUpper())
{
case "HW": //指定高宽缩放（可能变形）
break;
case "W": //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H": //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "CUT": //指定高宽裁减（不变形）
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;
case "AUTO": //自动适应高度
if (ow > oh)
{
//newwidth = 200;
toheight = (int)((double)oh / (double)ow * (double)towidth);
}
else
{
//newheight = 200;
towidth = (int)((double)ow / (double)oh * (double)toheight);
}
break;
default:
break;
}
//进行缩图
Bitmap img = new Bitmap(towidth, toheight);
img.SetResolution(72f, 72f);
//img.MakeTransparent();
Graphics gdiobj = Graphics.FromImage(img);
gdiobj.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.Default;
gdiobj.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.Default;
gdiobj.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
gdiobj.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
gdiobj.FillRectangle(new SolidBrush(Color.White), 0, 0,
towidth, toheight);
Rectangle destrect = new Rectangle(0, 0,
towidth, toheight);
gdiobj.DrawImage(originalImage, destrect, 0, 0, ow,
oh, GraphicsUnit.Pixel);
System.Drawing.Imaging.EncoderParameters ep = new System.Drawing.Imaging.EncoderParameters(1);
ep.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)100);
System.Drawing.Imaging.ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
try
{
if (ici != null)
{
img.Save(ms, ici, ep);
}
else
{
img.Save(ms, ConvertImageFormat(originalImagePath));
}
}
catch (System.Exception e)
{
throw e;
}
finally
{
gdiobj.Dispose();
img.Dispose();
}
}
originalImage.Dispose();
return(ms);
}
/// <summary>
/// 导入图片到媒体库
/// </summary>
/// <param name="PictureUrl">图片地址</param>
/// <returns></returns>
public String ImportPicture(String PictureUrl)
{
String Picture = "";
if (!String.IsNullOrEmpty(PictureUrl))
{
//查看该图片是否已经存在过
KeyValueEntity PictureTemp = ImportPictureList.Find(r1 => r1.Key == PictureUrl);
if (PictureTemp != null && !String.IsNullOrEmpty(PictureTemp.Key))
{
Picture = PictureTemp.Value.ToString();
}
else
{
DNNGo_DNNGalleryPro_Files PhotoItem = new DNNGo_DNNGalleryPro_Files();
//将图片的URL转换为相应的文件名，文件后缀等内容
PhotoItem.FileName = System.IO.Path.GetFileName(PictureUrl);//文件名 “Default.aspx”
if (!String.IsNullOrEmpty(PhotoItem.FileName) && PhotoItem.FileName.IndexOf(".") > 0)
{
PhotoItem.FileExtension = System.IO.Path.GetExtension(PhotoItem.FileName).Replace(".", "");
PhotoItem.Name = PhotoItem.FileName.Replace(System.IO.Path.GetExtension(PictureUrl), "");
//判断哪些文件需要被下载
if (NeedExtension(PhotoItem.FileExtension))
{
String FullFile = String.Format("{0}DNNGalleryPro\\uploads\\{1}\\{2}\\{3}\\{4}", DNNGalleryPro_PortalSettings.HomeDirectoryMapPath, DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, PhotoItem.FileName);
FileInfo file = new FileInfo(FullFile);
int ExistsCount = 1;
//如果有重复的文件，需要改变文件名
while (file.Exists)
{
PhotoItem.FileName = String.Format("{0}_{1}.{2}", PhotoItem.Name, ExistsCount, PhotoItem.FileExtension);
FullFile = String.Format("{0}DNNGalleryPro\\uploads\\{1}\\{2}\\{3}\\{4}", DNNGalleryPro_PortalSettings.HomeDirectoryMapPath, DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, PhotoItem.FileName);
file = new FileInfo(FullFile);
ExistsCount++;
}
try
{
if (!file.Directory.Exists)
{
file.Directory.Create();
}
//下载图片
WebClientX web = new WebClientX();
web.DownloadFile(new Uri(PictureUrl), FullFile);
file = new FileInfo(FullFile);
if (file.Exists)
{
PhotoItem.ModuleId = ModuleID;
PhotoItem.PortalId = DNNGalleryPro_PortalSettings.PortalId;
PhotoItem.FileSize = Convert.ToInt32(file.Length / 1024);
PhotoItem.FileMate = FileSystemUtils.GetContentType(Path.GetExtension(PhotoItem.FileName).Replace(".", ""));
PhotoItem.Status = (Int32)EnumFileStatus.Approved;
PhotoItem.FilePath = String.Format("DNNGalleryPro/uploads/{0}/{1}/{2}/{3}", DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, PhotoItem.FileName);
try
{
if (("png,gif,jpg,jpeg,bmp").IndexOf(PhotoItem.FileExtension) >= 0)
{
//图片的流
System.Drawing.Image image = System.Drawing.Image.FromFile(file.FullName);
PhotoItem.ImageWidth = image.Width;
PhotoItem.ImageHeight = image.Height;
PhotoItem.Exif = Common.Serialize <EXIFMetaData.Metadata>(new EXIFMetaData().GetEXIFMetaData(image));
}
}
catch
{
}
PhotoItem.LastTime = DateTime.Now;
PhotoItem.LastIP = WebHelper.UserHost;
//PhotoItem.LastUser = DNNGalleryPro_PortalSettings.UserInfo.UserID;
PhotoItem.ID = PhotoItem.Insert();
//返回图片的路径
Picture = String.Format("MediaID={0}", PhotoItem.ID);
ImportPictureList.Add(new KeyValueEntity(PictureUrl, Picture));
}
}
catch (Exception ex)
{
}
}
else
{
Picture = PictureUrl;
}
}
else
{
Picture = PictureUrl;
}
}
}
return(Picture);
}
