JSONストリームをboost :: asioで読み込み、完全な文字列を取得しますか？

Question

私はブーストを使ってTCPストリームを読んでいます。ストリームがこの形式になります。それが入ってくるように私はこれを読んで、各文字列を解析しようとしています

"{\"animationValues\":{\"mouth_rightMouth_stretch\":0.0000000000000000,\"mouth_leftMouth_narrow\":0.00000000000000000,\"mouth_up\":0.0000000000000000,\"mouth_leftMouth_stretch\":0.0000000000000000,\"mouth_rightMouth_narrow\":0.00000000000000000,\"mouth_down\":0.00000000000000000,\"mouth_upperLip_left_up\":0.0000000000000000,\"mouth_upperLip_right_up\":0.0000000000000000,\"mouth_lowerLip_left_down\":0.0000000000000000,\"mouth_lowerLip_right_down\":0.0000000000000000,\"mouth_leftMouth_frown\":0.0000000000000000,\"mouth_rightMouth_frown\":0.0000000000000000,\"mouth_leftMouth_smile\":0.00000000000000000,\"mouth_rightMouth_smile\":0.00000000000000000,\"eyes_lookRight\":0.0000000000000000,\"eyes_lookLeft\":0.00000000000000000,\"eyes_lookDown\":0.0000000000000000,\"eyes_lookUp\":0.00000000000000000,\"eyes_leftEye_blink\":0.00000000000000000,\"eyes_rightEye_blink\":0.00000000000000000,\"eyes_leftEye_wide\":0.0000000000000000,\"eyes_rightEye_wide\":0.0000000000000000,\"brows_leftBrow_up\":0.0000000000000000,\"brows_leftBrow_down\":0.00000000000000000,\"brows_rightBrow_up\":0.0000000000000000,\"brows_rightBrow_down\":0.00000000000000000,\"brows_midBrows_up\":0.0000000000000000,\"brows_midBrows_down\":0.00000000000000000,\"jaw_open\":0.0000000000000000,\"jaw_left\":0.0000000000000000,\"jaw_right\":0.00000000000000000,\"mouth_phoneme_oo\":0.0000000000000000,\"mouth_right\":0.0000000000000000,\"mouth_left\":0.00000000000000000,\"mouth_phoneme_mbp\":0.0000000000000000,\"mouth_phoneme_ch\":0.0000000000000000},\"headRot\":[0.0,0.0, 0.0]}"; 

だから私は何をする必要があるかは、上記のように見えるのセクションにストリームを分割しています。私は試しました：

boost::system::error_code error; 
    boost::asio::streambuf buffer; 
    boost::asio::read_until(sock, buffer, "]}"", error); 
    std::istream str(&buffer); 

しかし、これは私に必要な文字列の半分を与えます。私は試しました：

boost::array<char, 2046> buf; 
size_t len = sock.read_some(boost::asio::buffer(buf), error); 
std::string data(buf.begin(), buf.end()); 

しかし、これは私よりも少なくなります。ストリームの1つのセクションを一度に読み取るにはどうすればよいですか？ありがとうございました。

Answer 1

はい、read_untilまたはboost::asio::read_*ファミリのいずれかを使用しています。これは、読み込み操作（read_someのコンストラクトで）を構成しているためです。

ここでは、この作業のPOCです：

Live On Coliru

#include <boost/asio.hpp> 
#include <iostream> 

int main() 
{ 
    using namespace boost::asio; 
    using ip::tcp; 

    io_service io; 
    tcp::acceptor a(io, { {}, 6768 }); 
    a.listen(5); 

    tcp::socket s(io); 
    a.accept(s); 

    streambuf sb; 
    boost::system::error_code ec; 
    read_until(s, sb, "]}", ec); 

    std::cout << "Response: " << ec.message() << "\n"; 
    std::cout << "'" << &sb << "'\n"; 
} 

あなたが見ることができるように、

{"animationValues": {"mouth_rightMouth_stretch": 0,"mouth_leftMouth_narrow": 0,"mouth_up": 0,"mouth_leftMouth_stretch": 0,"mouth_rightMouth_narrow": 0,"mouth_down": 0,"mouth_upperLip_left_up": 0,"mouth_upperLip_right_up": 0,"mouth_lowerLip_left_down": 0,"mouth_lowerLip_right_down": 0,"mouth_leftMouth_frown": 0,"mouth_rightMouth_frown": 0,"mouth_leftMouth_smile": 0,"mouth_rightMouth_smile": 0,"eyes_lookRight": 0,"eyes_lookLeft": 0,"eyes_lookDown": 0,"eyes_lookUp": 0,"eyes_leftEye_blink": 0,"eyes_rightEye_blink": 0,"eyes_leftEye_wide": 0,"eyes_rightEye_wide": 0,"brows_leftBrow_up": 0,"brows_leftBrow_down": 0,"brows_rightBrow_up": 0,"brows_rightBrow_down": 0,"brows_midBrows_up": 0,"brows_midBrows_down": 0,"jaw_open": 0,"jaw_left": 0,"jaw_right": 0,"mouth_phoneme_oo": 0,"mouth_right": 0,"mouth_left": 0,"mouth_phoneme_mbp": 0,"mouth_phoneme_ch": 0},"headRot": [0, 0, 0]} 
{"animationValues": {"mouth_rightMouth_stretch": 1,"mouth_leftMouth_narrow": 1,"mouth_up": 1,"mouth_leftMouth_stretch": 1,"mouth_rightMouth_narrow": 1,"mouth_down": 1,"mouth_upperLip_left_up": 1,"mouth_upperLip_right_up": 1,"mouth_lowerLip_left_down": 1,"mouth_lowerLip_right_down": 1,"mouth_leftMouth_frown": 1,"mouth_rightMouth_frown": 1,"mouth_leftMouth_smile": 1,"mouth_rightMouth_smile": 1,"eyes_lookRight": 1,"eyes_lookLeft": 1,"eyes_lookDown": 1,"eyes_lookUp": 1,"eyes_leftEye_blink": 1,"eyes_rightEye_blink": 1,"eyes_leftEye_wide": 1,"eyes_rightEye_wide": 1,"brows_leftBrow_up": 1,"brows_leftBrow_down": 1,"brows_rightBrow_up": 1,"brows_rightBrow_down": 1,"brows_midBrows_up": 1,"brows_midBrows_down": 1,"jaw_open": 1,"jaw_left": 1,"jaw_right": 1,"mouth_phoneme_oo": 1,"mouth_right": 1,"mouth_left": 1,"mouth_phoneme_mbp": 1,"mouth_phoneme_ch": 1},"headRot": [1, 1, 1]} 
{"animationValues": {"mouth_rightMouth_stretch": 2,"mouth_leftMouth_narrow": 2,"mouth_up": 2,"mouth_leftMouth_stretch": 2,"mouth_rightMouth_narrow": 2,"mouth_down": 2,"mouth_upperLip_left_up": 2,"mouth_upperLip_right_up": 2,"mouth_lowerLip_left_down": 2,"mouth_lowerLip_right_down": 2,"mouth_leftMouth_frown": 2,"mouth_rightMouth_frown": 2,"mouth_leftMouth_smile": 2,"mouth_rightMouth_smile": 2,"eyes_lookRight": 2,"eyes_lookLeft": 2,"eyes_lookDown": 2,"eyes_lookUp": 2,"eyes_leftEye_blink": 2,"eyes_rightEye_blink": 2,"eyes_leftEye_wide": 2,"eyes_rightEye_wide": 2,"brows_leftBrow_up": 2,"brows_leftBrow_down": 2,"brows_rightBrow_up": 2,"brows_rightBrow_down": 2,"brows_midBrows_up": 2,"brows_midBrows_down": 2,"jaw_open": 2,"jaw_left": 2,"jaw_right": 2,"mouth_phoneme_oo": 2,"mouth_right": 2,"mouth_left": 2,"mouth_phoneme_mbp": 2,"mouth_phoneme_ch": 2},"headRot": [2, 2, 2]} 

を送信するときには、出力します。

注意すべき

Response: Success 
'{"animationValues": {"mouth_rightMouth_stretch": 0,"mouth_leftMouth_narrow": 0,"mouth_up": 0,"mouth_leftMouth_stretch": 0,"mouth_rightMouth_narrow": 0,"mouth_down": 0,"mouth_upperLip_left_up": 0,"mouth_upperLip_right_up": 0,"mouth_lowerLip_left_down": 0,"mouth_lowerLip_right_down": 0,"mouth_leftMouth_frown": 0,"mouth_rightMouth_frown": 0,"mouth_leftMouth_smile": 0,"mouth_rightMouth_smile": 0,"eyes_lookRight": 0,"eyes_lookLeft": 0,"eyes_lookDown": 0,"eyes_lookUp": 0,"eyes_leftEye_blink": 0,"eyes_rightEye_blink": 0,"eyes_leftEye_wide": 0,"eyes_rightEye_wide": 0,"brows_leftBrow_up": 0,"brows_leftBrow_down": 0,"brows_rightBrow_up": 0,"brows_rightBrow_down": 0,"brows_midBrows_up": 0,"brows_midBrows_down": 0,"jaw_open": 0,"jaw_left": 0,"jaw_right": 0,"mouth_phoneme_oo": 0,"mouth_right": 0,"mouth_left": 0,"mouth_phoneme_mbp": 0,"mouth_phoneme_ch": 0},"headRot": [0, 0, 0]} 
{"animationValues": {"mouth_rightMouth_stretch": 1,"mouth_leftMouth_narrow": 1,"mouth_up": 1,"mouth_leftMouth_stretch": 1,"mouth_rightMouth_narrow' 

もの：

1. は、フォーマットが]}が発生したことを、実際にそのようであることを確認してください。これはかなり印刷JSONが認識されないことを意味します

    "mouth_phoneme_mbp": 2, 
        "mouth_phoneme_ch": 2 
       }, 
       "headRot": [2, 2, 2] 
   } 
   

2. また、あなたがread_untilがよりデータが含まれているバッファを返す可能性があるという事実に気づいていることを確認します（それは、すぐに区切りがあるとして返します。満足していますが、より多くのデータが読み込まれている可能性があります）