DTCMS,添加文章时,内容中第一张图片作缩略图,并且等比例缩放图片
DTCMS,添加文章时,内容中第一张图片作缩略图
admin/article/article_edit.aspx.cs
导入:
using System.Drawing;
using System.Drawing.Imaging;
private bool DoAdd()方法
//是否将编辑器远程图片保存到本地 if (siteConfig.fileremote == 1) {
model.content = AutoRemoteImageSave(txtContent.Value);
后面加入:
//设置内容中第一张图片为缩略图 Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase); MatchCollection m = reg.Matches(model.content); foreach (Match math in m) { if (math.Index >) { string imgUri = math.Groups[1].Value; if (imgUri != string.Empty) { string mini = imgUri.ToLower().Substring(imgUri.LastIndexOf("."));
string path = imgUri.Substring(0, imgUri.Length - mini.Length);
BLL.siteconfig bll_config = new BLL.siteconfig();
Model.siteconfig m_config = bll_config.loadConfig();
int h = m_config.thumbnailheight;
int w = m_config.thumbnailwidth;
Bitmap bmp = new Bitmap(Server.MapPath(imgUri));
Bitmap bmp_new = ZoomImage(bmp, h, w);
switch (mini)
{
case ".jpg": bmp_new.Save(Server.MapPath(path + "_thum" + mini), ImageFormat.Jpeg); break;
case ".gif": bmp_new.Save(Server.MapPath(path + "_thum" + mini), ImageFormat.Gif); break;
}
hidFocusPhoto.Value = path + "_thum" + mini;
break; } } }
添加方法:
#region 等比例缩放图片 private Bitmap ZoomImage(Bitmap bitmap, int destHeight, int destWidth) { try { System.Drawing.Image sourImage = bitmap; int width = 0, height = 0; //按比例缩放 int sourWidth = sourImage.Width; int sourHeight = sourImage.Height; if (sourHeight > destHeight || sourWidth > destWidth) { if ((sourWidth * destHeight) > (sourHeight * destWidth)) { width = destWidth; height = (destWidth * sourHeight) / sourWidth; } else { height = destHeight; width = (sourWidth * destHeight) / sourHeight; } } else { width = sourWidth; height = sourHeight; } Bitmap destBitmap = new Bitmap(destWidth, destHeight); Graphics g = Graphics.FromImage(destBitmap); g.Clear(Color.Transparent); //设置画布的描绘质量 g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.DrawImage(sourImage, new Rectangle((destWidth - width) / 2, (destHeight - height) / 2, width, height), 0, 0, sourImage.Width, sourImage.Height, GraphicsUnit.Pixel); g.Dispose(); //设置压缩质量 System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters(); long[] quality = new long[1]; quality[0] = 100; System.Drawing.Imaging.EncoderParameter encoderParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality); encoderParams.Param[0] = encoderParam; sourImage.Dispose(); return destBitmap; } catch { return bitmap; } } #endregion