上传图片长宽/修改上传图片

来源：互联网发布：360手机下载软件编辑：程序博客网时间：2024/05/17 04:25

方法一：客户端： <input id="FileUpload" type="file" size="27" name="FileUpload" onpropertychange="javascript:img2.src=this.value;"> <img id="img2" src="" style="visibility:hidden;position:absolute;top=-10000"/> <input type="button" value="获取" onclick="javascript:abc();"> <script language="javascript"> function abc() { alert(img2.width); } </script>

方法二：服务端 //从文件或数据流得到Image对象 ------------------------------------ System.Drawing.Image image=System.Drawing.Image.FromFile(@"c:/aa.jpeg"); ------------------------------------- Stream stream=file.PostedFile.InputStream; System.Drawing.Image image=System.Drawing.Image.FromStream(stream);

//长和宽尺寸 Image.Width Image.Height

System.Web.UI.HtmlControls.HtmlInputFile file; 大小：file.PostedFile.ContentLength 注意：引用流，不要忘了使用System.IO.Stream

=======================================================================================

thefile.PostedFile.SaveAs(System.Web.HttpContext.Current.Server.MapPath("temp.png")); MemoryStream MemStream=new MemoryStream(); System.Drawing.Image imgOutput =System.Drawing.Bitmap.FromFile(System.Web.HttpContext.Current.Server.MapPath("temp.png")); //修改成80×80大小System.Drawing.Image imgOutput2=imgOutput.GetThumbnailImage(80,80,null,IntPtr.Zero); imgOutput2.Save(System.Web.HttpContext.Current.Server.MapPath("image.png"), ImageFormat.Png); Response.Write(thefile.PostedFile.FileName); Response.Write("Len:"+MemStream.Length.ToString()); imgOutput.Dispose(); imgOutput2.Dispose(); Response.Write("上传成功!"); Response.Write(System.Web.HttpContext.Current.Server.MapPath("image.png"));