Qt的语音识别功能 代码

Qt本身并不提供语音识别功能，但可以通过调用第三方库来实现。以下是一个使用百度语音识别API的示例代码：

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QUrl>
#include <QUrlQuery>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 百度语音识别API的接口地址
    const QString apiUrl = "http://vop.baidu.com/server_api";
    // 申请的百度语音识别API的App ID
    const QString appId = "your_app_id";
    // 申请的百度语音识别API的API Key
    const QString apiKey = "your_api_key";
    // 申请的百度语音识别API的Secret Key
    const QString secretKey = "your_secret_key";

    // 待识别的音频文件路径
    const QString audioFilePath = "your_audio_file_path";

    // 读取音频文件
    QFile audioFile(audioFilePath);
    if (!audioFile.open(QIODevice::ReadOnly)) {
        qDebug() << "Failed to open audio file.";
        return -1;
    }
    QByteArray audioData = audioFile.readAll();
    audioFile.close();

    // 发送HTTP POST请求
    QNetworkAccessManager manager;
    QNetworkRequest request(apiUrl);
    request.setHeader(QNetworkRequest::ContentTypeHeader, "audio/wav;rate=16000");
    request.setHeader(QNetworkRequest::ContentLengthHeader, audioData.length());
    request.setRawHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3");
    request.setRawHeader("Content-Type", "application/json");
    request.setRawHeader("Accept", "application/json");
    request.setRawHeader("Charset", "UTF-8");

    // 构造请求参数
    QUrlQuery params;
    params.addQueryItem("format", "wav");
    params.addQueryItem("rate", "16000");
    params.addQueryItem("channel", "1");
    params.addQueryItem("cuid", "qt_app");
    params.addQueryItem("token", "");
    params.addQueryItem("lan", "zh");
    params.addQueryItem("speech", audioData.toBase64());
    params.addQueryItem("len", QString::number(audioData.length()));
    QByteArray postData = params.toString(QUrl::FullyEncoded).toUtf8();

    // 计算签名
    QString curTime = QString::number(QDateTime::currentDateTime().toTime_t());
    QString param = "appid=" + appId + "&" +
                    "cuid=qt_app&" +
                    "dev_pid=1536&" +
                    "lan=zh&" +
                    "len=" + QString::number(audioData.length()) + "&" +
                    "speech=" + QString(audioData.toBase64()) + "&" +
                    "spd=5&" +
                    "time=" + curTime + "&" +
                    "tok=";
    QString sign = QString(QCryptographicHash::hash(param.toUtf8() + secretKey.toUtf8(), QCryptographicHash::Md5).toHex());
    request.setRawHeader("x-appid", appId.toUtf8());
    request.setRawHeader("x-param", param.toUtf8());
    request.setRawHeader("x-signature", sign.toUtf8());
    request.setRawHeader("x-customerid", "qt_app");

    QNetworkReply *reply = manager.post(request, postData);
    QObject::connect(reply, &QNetworkReply::finished, [&]() {
        if (reply->error() == QNetworkReply::NoError) {
            QByteArray response = reply->readAll();
            QJsonDocument jsonDoc = QJsonDocument::fromJson(response);
            if (!jsonDoc.isNull() && jsonDoc.isObject()) {
                QJsonObject jsonObj = jsonDoc.object();
                if (jsonObj.contains("result")) {
                    QJsonArray resultArray = jsonObj.value("result").toArray();
                    QString result = "";
                    foreach (const QJsonValue &value, resultArray) {
                        result += value.toString();
                    }
                    qDebug() << "识别结果：" << result;
                }
            }
        } else {
            qDebug() << "Failed to send request:" << reply->errorString();
        }
        reply->deleteLater();
        qApp->quit();
    });

    return a.exec();
}

需要注意的是，这里使用的是百度语音识别API，需要先在百度开放平台上注册并申请API Key和Secret Key，并且每次调用API时需要计算签名。此外，百度语音识别API的返回结果是JSON格式的，需要使用Qt的JSON解析器进行解析。