如何从网址下载图片 [英] How to download image from url

查看:71
本文介绍了如何从网址下载图片的处理方法,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

如果链接末尾的URL没有图像格式,是否可以从C#中的URL直接下载图像?网址示例:

  https://fbcdn-sphotos-ha.akamaihd.net/hphotos-ak-xpf1/v/ t34.0-12 / 10555140_10201501435212873_1318258071_n.jpg?oh = 97ebc03895b7acee9aebbde7d6b002bf& oe = 53C9ABB0& __ gda __ = 1405685729_110e04e71d969d392b63b27ec4f4b24a 
$ b $$ 当网址以图片格式结尾时,我知道如何下载图片。例如:

  http://img1.wikia.nocookie.net/__cb20101219155130/uncyclopedia/images/7/70/Facebooklogin。 png 


解决方案

简单
您可以使用以下方法。

 使用(WebClient client = new WebClient())
{
client.DownloadFile(new Uri(url),@ c:\temp\image35.png);
// OR
client.DownloadFileAsync(new Uri(url),@ c:\temp\image35.png);
}

这些方法与DownloadString(..)和DownloadStringAsync(.. )。他们将文件存储在目录中,而不是C#字符串中,并且不需要URi中的格式扩展名。



如果您不知道Format(.png,.jpeg等)的图像



  public void SaveImage(字符串文件名,ImageFormat格式)
{
WebClient客户端=新的WebClient();
流stream = client.OpenRead(imageUrl);
位图位图;位图=新的位图(流);

if(位图!=空)
{
bitmap.Save(文件名,格式);
}

stream.Flush();
stream.Close();
client.Dispose();
}



使用



  try 
{
SaveImage(-任何图像路径---,ImageFormat.Png)
}
catch(ExternalException)
{
//格式有误-可能是必需的格式不是
//适用于此处
}
catch( ArgumentNullException)
{
//流
出问题}


Is there a way to download an image directly from a url in c# if the url does not have an image format at the end of the link? Example of url:

https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/v/t34.0-12/10555140_10201501435212873_1318258071_n.jpg?oh=97ebc03895b7acee9aebbde7d6b002bf&oe=53C9ABB0&__gda__=1405685729_110e04e71d969d392b63b27ec4f4b24a

I know how to download the image when the url ends with an image format. Eg:

http://img1.wikia.nocookie.net/__cb20101219155130/uncyclopedia/images/7/70/Facebooklogin.png

解决方案

Simply You can use following methods.

using (WebClient client = new WebClient()) 
{
    client.DownloadFile(new Uri(url), @"c:\temp\image35.png");
    // OR 
    client.DownloadFileAsync(new Uri(url), @"c:\temp\image35.png");
}

These methods are almost same as DownloadString(..) and DownloadStringAsync(...). They store the file in Directory rather than in C# string and no need of Format extension in URi

If You don't know the Format(.png, .jpeg etc) of Image

public void SaveImage(string filename, ImageFormat format)
{    
    WebClient client = new WebClient();
    Stream stream = client.OpenRead(imageUrl);
    Bitmap bitmap;  bitmap = new Bitmap(stream);

    if (bitmap != null)
    {
        bitmap.Save(filename, format);
    }

    stream.Flush();
    stream.Close();
    client.Dispose();
}

Using it

try
{
    SaveImage("--- Any Image Path ---", ImageFormat.Png)
}
catch(ExternalException)
{
    // Something is wrong with Format -- Maybe required Format is not 
    // applicable here
}
catch(ArgumentNullException)
{   
    // Something wrong with Stream
}

这篇关于如何从网址下载图片的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆