概念

Qt中有QNetworkAccessManager、QHttpMultiPart、QJsonArray、QHttpPart，可以实现发送http数据包，其中QNetworkAccessManager中有个函数，可以实现Get或者Post方法。

演示

程序运行截图如下：

加入图片后，点击提交，可活得face++返回的json数据，其中就有一个confidence值，这个值就是可信度！

比如下面这两种刘德华的照片如下图所示：

如果是两张不同的图片

源码

程序结构如下：

widget.ui如下：

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QHttpPart>

QT_BEGIN_NAMESPACE
class QNetworkAccessManager;
class QNetworkReply;
QT_END_NAMESPACE

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

protected:
    void loadLeftLabel();
    void loadRightLabel();

    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;

    QHttpPart setHttpPart(QByteArray body, QVariant value);
    QHttpPart imageHttpPart(const QString &fileName, QVariant value);


protected slots:
    void finished(QNetworkReply *reply);
    void btnClicked();

private:
    Ui::Widget *ui;

    QString m_leftFileName;
    QString m_rightFileName;

    QNetworkAccessManager *m_manager;
};

#endif // WIDGET_H

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QMouseEvent>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QFileDialog>
#include <QByteArray>
#include <QHttpMultiPart>
#include <QJsonArray>
#include <QMap>
#include <QJsonDocument>
#include <QJsonObject>
#include <QMessageBox>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setWindowTitle("CSDN IT1995");
    m_manager = new QNetworkAccessManager(this);

    connect(ui->okPushButton, SIGNAL(clicked(bool)), this, SLOT(btnClicked()));
    connect(m_manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(finished(QNetworkReply*)));\
}

Widget::~Widget()
{
    delete ui;
}

void Widget::loadLeftLabel()
{
    QString fileName = QFileDialog::getOpenFileName(this, "选择图片", qApp->applicationDirPath(), "Image Files (*.png *.jpg *.bmp)");
    if(!fileName.isEmpty()){

        m_leftFileName = fileName;
        ui->face1Label->clear();
        ui->face1Label->setPixmap(QPixmap(fileName));
        return;
    }

    ui->face1Label->clear();
    ui->face1Label->setText("face1");
    m_leftFileName = "";
}

void Widget::loadRightLabel()
{
    QString fileName = QFileDialog::getOpenFileName(this, "选择图片", qApp->applicationDirPath(), "Image Files (*.png *.jpg *.bmp)");
    if(!fileName.isEmpty()){

        m_rightFileName = fileName;
        ui->face2Label->clear();
        ui->face2Label->setPixmap(QPixmap(fileName));
        return;
    }

    ui->face2Label->clear();
    ui->face2Label->setText("face1");
    m_rightFileName = "";
}

void Widget::mouseReleaseEvent(QMouseEvent *event)
{
    int currentX = event->pos().x();
    int currentY = event->pos().y();

    int leftPicStartX = ui->face1Label->pos().x();
    int leftPicEndX = leftPicStartX + ui->face1Label->width();
    int leftPicStartY = ui->face1Label->pos().y();
    int leftPicEndY = leftPicStartY + ui->face1Label->height();

    int rightPicStartX = ui->face2Label->pos().x();
    int rightPicEndX = rightPicStartX + ui->face2Label->width();
    int rightPicStartY = ui->face2Label->pos().y();
    int rightPicEndY = rightPicStartY + ui->face2Label->height();

    //left Picture
    if((leftPicStartX < currentX) && (leftPicEndX > currentX)
            && (leftPicStartY < currentY) && (leftPicEndY > currentY)){

        qDebug() << "left Picture";
        loadLeftLabel();
    }

    //right Picture
    if((rightPicStartX < currentX) && (rightPicEndX > currentX)
            && (rightPicStartY < currentY) && (rightPicEndY > currentY)){

        qDebug() << "right Picture";
        loadRightLabel();
    }

    QWidget::mouseReleaseEvent(event);
}

QHttpPart Widget::setHttpPart(QByteArray body, QVariant value)
{
    QHttpPart part;
    part.setHeader(QNetworkRequest::ContentDispositionHeader, value);
    part.setBody(body);
    return part;
}

QHttpPart Widget::imageHttpPart(const QString &fileName, QVariant value)
{
    QHttpPart imagePart;
    imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
    imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, value);

    QByteArray fileFlow;
    QFile file(fileName);

    if(file.open(QIODevice::ReadOnly)){

        fileFlow = file.readAll();
        imagePart.setBody(fileFlow.toBase64());
    }

    return imagePart;
}

void Widget::finished(QNetworkReply *reply)
{
    QByteArray responseData = reply->readAll();
    QMap<QString, QVariant> map;
    QJsonDocument document;
    map = document.fromJson(responseData).toVariant().toMap();

    qDebug() << responseData;

    float confidence = map.value("confidence").toFloat();
    QMessageBox::information(this, "tip", "The confidence is " + QString::number(confidence));
}

void Widget::btnClicked()
{
    QString apiKey = "XqIypFbRHDRJ2LmBfMwO531E8wnZ0FVm";
    QString apiSecret = "TBS_8r7czQ3_ZLmox-jv9E3tOLyjIjop";


    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QHttpPart keyPart = setHttpPart(apiKey.toLatin1(), QVariant("form-data; name=\"api_key\""));
    multiPart->append(keyPart);

    QHttpPart secret = setHttpPart(apiSecret.toLatin1(), QVariant("form-data; name=\"api_secret\""));
    multiPart->append(secret);

    QHttpPart faceImage1;
    faceImage1 = imageHttpPart(m_leftFileName, "form-data; name=\"image_base64_1\"");
    multiPart->append(faceImage1);

    QHttpPart faceImage2;
    faceImage2 = imageHttpPart(m_rightFileName, "form-data; name=\"image_base64_2\"");
    multiPart->append(faceImage2);

    QUrl url("https://api-cn.faceplusplus.com/facepp/v3/compare");
    QNetworkRequest request;
    request.setUrl(url);

    QNetworkReply *reply = m_manager->post(request, multiPart);
    multiPart->setParent(reply);
}

Qt调用face++的http接口，实现人脸对比

概念

演示

源码

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