如何将图像URL转换为system.drawing.image

本文介绍了如何将图像URL转换为system.drawing.image的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用 VB.Net 我有一个图片的网址，假设 http：//localhost/image.gif

I'm using VB.Net I have an url of an image, let's say localhost/image.gif

我需要从该文件创建一个System.Drawing.Image对象。

I need to create a System.Drawing.Image object from that file.

注意将此保存到文件然后打开它不是我的选项之一我也在使用 ItextSharp

Notice save this to a file and then open it is not one of my options also i'm using ItextSharp

这是我的代码：

Dim rect As iTextSharp.text.Rectangle rect = iTextSharp.text.PageSize.LETTER Dim x As PDFDocument = New PDFDocument("chart", rect, 1, 1, 1, 1) x.UserName = objCurrentUser.FullName x.WritePageHeader(1) For i = 0 To chartObj.Count - 1 Dim chartLink as string = "localhost/image.gif" x.writechart( ** it only accept system.darwing.image ** ) Next x.WritePageFooter() x.Finish(False)

推荐答案

您可以使用WebClient类下载图像，然后使用MemoryStream来读取它：

You could use WebClient class to download image and then MemoryStream to read it:

C＃

WebClient wc = new WebClient(); byte[] bytes = wc.DownloadData("localhost/image.gif"); MemoryStream ms = new MemoryStream(bytes); System.Drawing.Image img = System.Drawing.Image.FromStream(ms);

VB

Dim wc As New WebClient() Dim bytes As Byte() = wc.DownloadData("localhost/image.gif") Dim ms As New MemoryStream(bytes) Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)