C#根据http和ftp图片地址获取对应图片

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

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。