Streaming 如何下载/传输使用UPnP找到的文件？

我对UPnP作为一种协议是完全陌生的，但我希望用它将文件从索尼相机传输到我正在开发的iOS应用程序。到目前为止，我已经有了SSDP发现设置，我可以阅读UPnP客户端的服务，搜索文件夹和访问文件名，但我遇到的最后一个障碍是，一旦我能够列出文件，如何实际下载/传输它们

我最终得到的结果如下：

<item id="04_02_0624600856_000001_000001_000000" restricted="1" parentID="03_01_0624600856_000001_000000_000000">
  <dc:title>DSC05076.ARW</dc:title>
  <upnp:class>object.item.imageItem.photo</upnp:class>
  <dc:date>2018-08-23T12:24:21</dc:date>
  <res protocolInfo="http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_SM;DLNA.ORG_CI=1">http://192.168.122.1:60151/SM_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fSM%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21</res>
  <res protocolInfo="http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_LRG;DLNA.ORG_CI=1">http://192.168.122.1:60151/LRG_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fLRG%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21</res>
  <res protocolInfo="http-get:*:image/jpeg:DLNA.ORG_PN=JPEG_TN;DLNA.ORG_CI=1">http://192.168.122.1:60151/TN_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fTN%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21</res>

DSC05076.ARW
object.item.imageItem.photo
2018-08-23T12:24:21
http://192.168.122.1:60151/SM_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fSM%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21
http://192.168.122.1:60151/LRG_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fLRG%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21
http://192.168.122.1:60151/TN_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fTN%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21

我（凭借我对简单HTTP API的天真体验）希望能够通过点击以下按钮下载相关文件：

http://192.168.122.1:60151/SM_DSC05076.ARW

或类似内容（我假设我必须稍微更改此URL，因为文件列为

image/jpeg

而不是RAW

无论我尝试什么组合，包括完整的

res

对象、剪切位、解码url e.t.c。当我尝试访问相关url时，总是会得到404响应。我需要在这里做些更复杂的事情吗？还是缺少一些简单的事情

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提前感谢！

这里的问题是我使用了上一个会话中的url。结果表明，url在连接会话之间会发生变化，这就是为什么我得到了404

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经验教训：UPnP是高度动态的，您不能依赖于在其访问MRL下缓存图像！

您尝试过完整的

http://192.168.122.1:60151/LRG_DSC05076.ARW?%2104%5f02%5f0624600856%5f000001%5f000001%5f000000%21http%2dget%3a%2a%3aimage%2fjpeg%3aDLNA%2eORG%5fPN%3dJPEG%5fLRG%3bDLNA%2eORG%5fCI%3d1%21%21%21%21%21

？我没有w、 原来我只是个白痴！我假设URL没有改变，所以使用了上一个会话中的URL。结果他们确实改变了！