如何将图像URL转换为system.drawing.image [英] How can I convert image url to system.drawing.image

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 http://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 = "http://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("http://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("http://localhost/image.gif")
Dim ms As New MemoryStream(bytes)
Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(ms)

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