.net上传图片并同时生成缩略图
(2006-03-10 13:55:38)
runat="server">
注意:
sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
+ file_append.ToString() + extendName;
}
System.IO.FileStream newFile
= new System.IO.FileStream(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename),
System.IO.FileMode.Create, System.IO.FileAccess.Write);
newFile.Write(myData, 0, myData.Length);
newFile.Close();
return sFilename;
//以上为上传原图
//try
//{
// //原图加载
// using (System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename)))
// {
// //原图宽度和高度
// int width = sourceImage.Width;
// int height = sourceImage.Height;
// int smallWidth;
// int smallHeight;
// //获取第一张绘制图的大小,(比较 原图的宽/缩略图的宽 和 原图的高/缩略图的高)
// if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
// {
// smallWidth = intThumbWidth;
// smallHeight = intThumbWidth * height / width;
// }
// else
// {
// smallWidth = intThumbHeight * width / height;
// smallHeight = intThumbHeight;
// }
// //判断缩略图在当前文件夹下是否同名称文件存在
// file_append = 0;
// sThumbFile = sThumbExtension + System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + extendName;
// while (System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sThumbFile)))
// {
// file_append++;
// sThumbFile = sThumbExtension + System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
// file_append.ToString() + extendName;
// }
// //缩略图保存的绝对路径
// string smallImagePath = System.Web.HttpContext.Current.Server.MapPath(sSavePath) + sThumbFile;
// //新建一个图板,以最小等比例压缩大小绘制原图
// using (System.Drawing.Image bitmap = new System.Drawing.Bitmap(smallWidth, smallHeight))
// {
// //绘制中间图
// using (System.Drawing.Grap
hics g = System.Drawing.Graphics.FromImage(bitmap))
// {
// //高清,平滑
// g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// g.Clear(Color.Black);
// g.DrawImage(
// sourceImage,
// new System.Drawing.Rectangle(0, 0, smallWidth, smallHeight),
// new System.Drawing.Rectangle(0, 0, width, height),
// System.Drawing.GraphicsUnit.Pixel
// );
// }
// //新建一个图板,以缩略图大小绘制中间图
// using (System.Drawing.Image bitmap1 = new System.Drawing.Bitmap(intThumbWidth, intThumbHeight))
// {
// //绘制缩略图
// using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap1))
// {
// //高清,平滑
// g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// g.Clear(Color.Black);
// int lwidth = (smallWidth - intThumbWidth) / 2;
// int bheight = (smallHeight - intThumbHeight) / 2;
// g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
// g.Dispose();
// bitmap1.Save(smallImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
// }
// }
// }
// }
//}
//catch
//{
// //出错则删除
// System.IO.File.Delete(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename));
// return "图片格式不正确";
//}
////返回缩略图名称
//return sThumbFile;
}
return "没有选择图片";
}