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使用 Poco,我正在尝试模拟 AXIS 相机网络服务器,它根据客户端请求发送 jpeg 帧。

每个 Web 响应都应该使用 Content-Type: multipart/x-mixed-replace 和预定义的边界进行编码。

我怎样才能用 Poco 做到这一点?谢谢。

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2 回答 2

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response.setContentType()是正确的,但是当您进行sendBuffer()时,Poco 不会将预定义的边界字符串放在每个边界块的顶部。

将setChunkedTransferEncoding()指定为false以避免块传输很重要,这不是我所要求的。

我需要的是这个: http ://www.w3.org/Protocols/rfc1341/7_2_Multipart.html

如果这是我的数据缓冲区:“这是第一个边界块。一个边界块可能会在下一个块中继续。这是第二个边界块。”

这是我需要实现的:

HTTP/1.1 200 OK
Date: Tue, 01 Dec 2013 10:27:30 GMT
Content-Length: 117
Content-Type: Multipart/mixed; boundary="sample_boundary";

--sample_boundary
This is the first boundary block. A boundary block may

--sample_boundary
continue in the next block. This is the second boundary block.

玩弄这个,我看到我必须手动拆分我的缓冲区以获得所需的边界。

这就是我实际这样做的方式:

std::ostream& ostr = response.send();

char frameBuffer[102410];
char fragment[1024];

string boundary = "--BOUNDARY--";
response.setChunkedTransferEncoding(false);
response.setContentType("multipart/x-mixed-replace; boundary=" + boundary);


//Split my frameBuffer in some fragments with boundary
unsigned int nBytes = sizeof(frameBuffer);
unsigned int _MAX_FRAGMENT_SIZE_ = sizeof(fragment);
unsigned int index=0;

response.setContentLength(frameLength);

while (nBytes>0){

    unsigned int size = (nBytes>_MAX_FRAGMENT_SIZE_)?_MAX_FRAGMENT_SIZE_:nBytes;
    memcpy(fragment, frameBuffer + index, size);

    //Enviamos el fragmento sin mas con su boundary correspondiente.
    ostr << boundary << "\r\n";
    ostr.write(fragment, size);
    ostr << "\r\n";

    index += size;
    nBytes -= size;
}

我认为 Poco 有工具可以解决这个问题。谢谢

于 2013-03-13T10:12:40.717 回答
0

这些方面应该做的事情:

using Poco::Net::HTTPRequestHandler;
using Poco::Net::HTTPServerRequest;
using Poco::Net::HTTPServerResponse;
using Poco::Net::HTTPRequestHandlerFactory;
using Poco::Net::HTTPServerParams;
using Poco::Net::HTTPServer;
using Poco::Net::ServerSocket;
using Poco::Net::SocketAddress;

struct AXISRequestHandler: public HTTPRequestHandler
{
    void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
    {
        // ... get data to send back
        response.setContentType("multipart/x-mixed-replace; boundary=--MY_BOUND");
        response.sendBuffer(data, size);
    }
};

struct AXISRequestHandlerFactory: public HTTPRequestHandlerFactory
{
    HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request)
    {
        return new AXISRequestHandler;
    }
};

ServerSocket svs(SocketAddress("192.168.0.1", 8080));
HTTPServerParams* pParams = new HTTPServerParams;
// ... set server params here to your liking
HTTPServer srv(new AXISRequestHandlerFactory, svs, pParams);
srv.start(); // NB: server will fly off here (to its own thread)
于 2013-03-12T23:29:47.857 回答