找到要抓取的图片地址:http://i.imgur.com/8S7OaEB.jpg

抓取的步骤:

  1. 请求图片路径
  2. 获取返回的数据
  3. 将数据转换为stream
  4. 将stream转换为Image
  5. 保存Image

明晰了步骤,接下来就简单了,直接上代码

public class RemoteImageCatchUtil
{
private static string[] ImageExts = new[] { "jpg", "jpeg", "png", "bitmap", "gif" }; public static string Catch(string remoteImagePath, string saveFolder, int timeout = 2000)
{
try
{
var request = WebRequest.Create(remoteImagePath) as HttpWebRequest;
request.Timeout = timeout > 0 ? timeout : 1000;
using (var response = request.GetResponse() as HttpWebResponse)
{
if (response.StatusCode != HttpStatusCode.OK)
{
throw new Exception("远程访问失败");
}
else
{
var ext = GetImageExtension(response.ContentType).ToLower();
if (!ImageExts.Contains(ext))
{
throw new Exception("非图片文件");
} var stream = response.GetResponseStream();
var buffer = new byte[2048];
int count;
using (var ms = new MemoryStream())
{
while ((count = stream.Read(buffer, 0, buffer.Length)) != 0)
{
ms.Write(buffer, 0, count);
} if (!Directory.Exists(saveFolder))
{
Directory.CreateDirectory(saveFolder);
}
var imageName = Path.GetRandomFileName() + "." + ext;
var imagePath = Path.Combine(saveFolder, imageName);
var image = new Bitmap(ms);
image.Save(imagePath);
return imageName;
}
}
}
}
catch(Exception ex)
{
throw ex;
}
} private static string GetImageExtension(string contentType)
{
if (contentType.StartsWith("image"))
{
return contentType.Split(@"/").Last();
}
return string.Empty;
}
}

注意,这里的代码仅供测试,使用时请自行完善。

04-26 17:13
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