How can I convert image url to system.drawing.image

Question

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

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

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

here is my code :

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)

score 77 · Accepted Answer · edited Jan 24 '14 at 21:08

77

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)

edited Jan 24 '14 at 21:08

Mina Gabriel

23,150
26
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answered Aug 03 '12 at 18:59

Varius

3,197
1
19
8

If you were worried about the image not being there, would you put the MemoryStream section in a using statement? – Jason Jan 14 '15 at 14:27
I would upvote this SO HARD if you provided both ASP.Net MVC and ASP.Net Core solution to the C# route - (ASP.Net Core can't use `WebClient`) – LatentDenis Jul 12 '17 at 20:56

score 19 · Answer 2 · answered Jan 20 '16 at 11:04

The other answers are also correct, but it hurts to see the Webclient and MemoryStream not getting disposed, I recommend putting your code in a using.

Example code:

using (var wc = new WebClient())
{
    using (var imgStream = new MemoryStream(wc.DownloadData(imgUrl)))
    {
        using (var objImage = Image.FromStream(imgStream))
        {
            //do stuff with the image
        }
    }
}

The required imports at top of your file are System.IO, System.Net & System.Drawing

In VB.net the syntax was using wc as WebClient = new WebClient() { etc

Filix Mogilevsky · Answer 3 · 2020-01-19T17:08:18.627

3

You can use HttpClient and accomplish this task async with few lines of code.

public async Task<Bitmap> GetImageFromUrl(string url)
    {
        var httpClient = new HttpClient();
        var stream = await httpClient.GetStreamAsync(url);
        return new Bitmap(stream);
    }

edited Jan 19 '20 at 17:08

answered Jan 19 '20 at 05:37

Filix Mogilevsky

727
8
13

Please consider adding some explanation or details to your answer. While it might answer the question, just adding a piece of code as an answer, doesn't per say help OP or future community members understand the issue or the proposed solution. – Maxim Jan 19 '20 at 09:31

score 2 · Answer 4 · answered Aug 04 '12 at 04:33

2

iTextSharp is able to accept Uri's:

Image.GetInstance(uri)

answered Aug 04 '12 at 04:33

VahidN

18,457
8
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score 1 · Answer 5 · answered Aug 03 '12 at 19:00

1

You can try this to get the Image

Dim req As System.Net.WebRequest = System.Net.WebRequest.Create("[URL here]")
Dim response As System.Net.WebResponse = req.GetResponse()
Dim stream As Stream = response.GetResponseStream()

Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(stream)
stream.Close()

answered Aug 03 '12 at 19:00

Guilherme de Jesus Santos

4,955
5
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can you tell me how can i do the same think with a page that `Response.ContentType = "image/png"` i really appreciated – Mina Gabriel Aug 03 '12 at 19:15
I could do it the same way, as a any image, `response.GetResponseStream()` must work fine. – Guilherme de Jesus Santos Aug 06 '12 at 16:58

score 0 · Answer 6 · answered Aug 03 '12 at 19:01

0

Dim c As New System.Net.WebClient
Dim FileName As String = "c:\StackOverflow.png"
c.DownloadFile(New System.Uri("http://cdn.sstatic.net/stackoverflow/img/sprites.png?v=5"), FileName)
Dim img As System.Drawing.Image
img = System.Drawing.Image.FromFile(FileName)

answered Aug 03 '12 at 19:01

blang32

1

Actually, I like his better ^ I was rushing to be first. – blang32 Aug 03 '12 at 19:02
Save the file is not required (you can work it out using a memory stream) and just add potential problems (say you are within a web application that cannot write in the speficied path) – Gian Paolo Jan 19 '20 at 17:28

How can I convert image url to system.drawing.image

6 Answers6

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