本文实例为大家分享了C#根据http和ftp地址获取对应图片的具体代码，供大家参考，具体内容如下
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public class GetBitmapImageClass
{
public BitmapSource GetImageHttp(string url,int width)
{
var image = new BitmapImage();
int BytesToRead = 100;
if (!string.IsNullOrEmpty(url))
{
WebRequest request = WebRequest.Create(new Uri(url, UriKind.Absolute));
request.Timeout = -1;
WebResponse response = request.GetResponse();
Stream responseStream = response.GetResponseStream();
BinaryReader reader = new BinaryReader(responseStream);
MemoryStream memoryStream = new MemoryStream();
byte[] bytebuffer = new byte[BytesToRead];
int bytesRead = reader.Read(bytebuffer, 0, BytesToRead);
while (bytesRead > 0)
{
memoryStream.Write(bytebuffer, 0, bytesRead);
bytesRead = reader.Read(bytebuffer, 0, BytesToRead);
}
image.BeginInit();
image.DecodePixelWidth = width;
image.CacheOption = BitmapCacheOption.OnLoad;
memoryStream.Seek(0, SeekOrigin.Begin);
image.StreamSource = memoryStream;
image.EndInit();
image.Freeze();
memoryStream.Close();
reader.Close();
responseStream.Close();
response.Close();
}
return image;
}
public BitmapSource GetImageFtp(string url, int width)
{
var image = new BitmapImage();
if (!string.IsNullOrEmpty(url))
{
FtpWebRequest reqFtp;
reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
reqFtp.Method = WebRequestMethods.Ftp.DownloadFile;
reqFtp.UseBinary = true;
FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
Stream ftpStream = response.GetResponseStream();
MemoryStream mStream = new MemoryStream();
ftpStream.CopyTo(mStream);
mStream.Position = 0;
int length = (int)mStream.Length;
byte[] returnbyte = new byte[length];
mStream.Read(returnbyte, 0, length);
mStream.Close();
ftpStream.Close();
response.Close();
System.IO.MemoryStream stream = new System.IO.MemoryStream(returnbyte);
image.BeginInit();
image.DecodePixelWidth = width;
image.CacheOption = BitmapCacheOption.OnLoad;
stream.Seek(0, SeekOrigin.Begin);
image.StreamSource = stream;
image.EndInit();
image.Freeze();
stream.Close();
}
return image;
}
[DllImport("gdi32.dll", SetLastError = true)]
private static extern bool DeleteObject(IntPtr hObject);
public BitmapSource ToBitmapSource(System.Drawing.Bitmap bmp)
{
try
{
var ptr = bmp.GetHbitmap();
var source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
ptr, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
DeleteObject(ptr);
return source;
}
catch
{
return null;
}
}
//获取缩略图
public BitmapSource GetBitImage(string imageLink)
{
//"http://172.17.1.231:8083/3050273262379466760/2017/05/28/09/340800100999/09163448402.jpg?fid=1267520"
if (imageLink.StartsWith("http://"))
{
return GetImageHttp(imageLink,200);
}
//ftp格式的
else if (imageLink.StartsWith("ftp://"))
{
return GetImageFtp(imageLink, 200);
}
}
//获取原图
public BitmapSource GetHightBitImage(string imageLink)
{
//"http://172.17.1.231:8083/3050273262379466760/2017/05/28/09/340800100999/09163448402.jpg?fid=1267520"
if (imageLink.StartsWith("http://"))
{
return GetImageHttp(imageLink, 0);
}
//ftp格式的
else if (imageLink.StartsWith("ftp://"))
{
return GetImageFtp(imageLink, 0);
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
