QJsonObject append;

append["format"] = "pcm";
append["rate"] = 8000;
append["channel"] = 1;
append["token"] = s_token;
append["lan"] = "zh";
append["cuid"] = StrMac;
append["speech"] = QString(speechbase.toBase64());
append["len"] = s_len;

QUrl url("http://vop.baidu.com/server_api");

QByteArray array =QJsonDocument(append).toJson();
qDebug()<

QNetworkRequest request(url);
request.setHeader(QNetworkRequest::ContentTypeHeader,QVariant("application/json"));
request.setRawHeader("Content-Type", "application/json");
QNetworkAccessManager *manager = new QNetworkAccessManager(this);
manager->post(request,array );
connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinish(QNetworkReply *)));

有没有人帮帮忙，才看QT没多久。