我正在尝试使用 CefSharp 访问 URL 并捕获在加载给定页面期间检索到的特定资源。大概作为每个资源的流或字节数组。
CefSharp提供了IRequestHandler接口。您可以创建一个实现此接口的类来响应请求/响应事件,但它不以任何方式包含响应主体。
查看
GetResourceResponseFilter
的实现中的 IRequestHandler
。 GetResourceResponseFilter
返回 IResponseFilter
,它为您提供了捕获所有响应的机会。您需要实现自己的IResponseFilter
,幸运的是有足够的示例。
IResponseFilter
实现取自 CefSharp
GitHub 项目。
public class MemoryStreamResponseFilter : IResponseFilter
{
private MemoryStream memoryStream;
bool IResponseFilter.InitFilter()
{
//NOTE: We could initialize this earlier, just one possible use of InitFilter
memoryStream = new MemoryStream();
return true;
}
FilterStatus IResponseFilter.Filter(Stream dataIn, out long dataInRead, Stream dataOut, out long dataOutWritten)
{
if (dataIn == null)
{
dataInRead = 0;
dataOutWritten = 0;
return FilterStatus.Done;
}
dataInRead = dataIn.Length;
dataOutWritten = Math.Min(dataInRead, dataOut.Length);
//Important we copy dataIn to dataOut
dataIn.CopyTo(dataOut);
//Copy data to stream
dataIn.Position = 0;
dataIn.CopyTo(memoryStream);
return FilterStatus.Done;
}
void IDisposable.Dispose()
{
memoryStream.Dispose();
memoryStream = null;
}
public byte[] Data
{
get { return memoryStream.ToArray(); }
}
}
现在在您的
GetResourceResponseFilter
方法中:
private Dictionary<ulong, MemoryStreamResponseFilter> responseDictionary = new Dictionary<ulong, MemoryStreamResponseFilter>();
public IResponseFilter GetResourceResponseFilter(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response)
{
var dataFilter = new MemoryStreamResponseFilter();
responseDictionary.Add(request.Identifier, dataFilter);
return dataFilter;
}
然后在
OnResourceLoadComplete
:
public void OnResourceLoadComplete(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
{
MemoryStreamResponseFilter filter;
if (responseDictionary.TryGetValue(request.Identifier, out filter))
{
var data = filter.Data; //This returns a byte[]
//File.WriteAllBytes("c:/save/path", data);
}
}
您可以使用
IRequest
和 IResponse
参数中的属性来决定要过滤的内容。