QNetworkAccessManager定义对象报错，说构造函数无法解析

goodluck365168 2017-06-01 04:57:58

代码如下

#include <QDialog>

#include <QtNetwork/QNetworkAccessManager>

#include <QFile>

#include <QtNetwork/QNetworkReply>

#include <QtNetwork/QNetworkRequest>

#include <QPushButton>

#include <QHBoxLayout>

#include <QIODevice>



class Dialog : public QDialog

{

public:

    Dialog(QWidget *parent = 0);

protected slots:

    void httpDownload();

    void replyFinished(QNetworkReply*reply);

    void onUploadProgress(qint64 bytesSent,qint64 butesTotal);



private:

    QPushButton *download_Btn;

    QFile *file;

    QNetworkAccessManager *accessManager;

    QNetworkRequest request;

    QNetworkReply *reply;

    QHBoxLayout *layout;

};



#endif // DIALOG_H

#include "dialog.h"

#include<QtDebug>

Dialog::Dialog(QWidget *parent): QDialog(parent)

{

    download_Btn=new QPushButton("download");

    layout=new QHBoxLayout();

    layout->addWidget(download_Btn);

    layout->sizeHint().height();

    setLayout(layout);

    connect(download_Btn,SIGNAL(clicked()),this,SLOT(httpDownload()));

}

void Dialog::httpDownload(){

    //QUrl url("http://localhost:8080/uploadtest/MyUpload");

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

    QByteArray post_data;//上传的数据可以是QByteArray或者file类型

    post_data.append("hello");

    file=new QFile("/home/vino/Desktop/a.txt");

    file->open(QIODevice::ReadOnly);//只读方式打开文件

    accessManager=new QNetworkAccessManager(this);



    request.setUrl(url);

    /******************设置http的header***********************/

   // request.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data");

   // request.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");//上传文件

   // request.setRawHeader("Content-Disposition","form-data;name='doc';filename='a.txt'");

    //request.setHeader(QNetworkRequest::ContentLengthHeader,post_data.length());





    connect(accessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));//finish为manager自带的信号，replyFinished是自定义的

    reply=accessManager->post(request,post_data);//通过发送数据，返回值保存在reply指针里.



    //connect(reply, SIGNAL(uploadProgress ( qint64 ,qint64 )), this, SLOT( onUploadProgress(qint64 ,qint64 ));//上传文件时进度



    //void QNetworkReply::downloadProgress ( qint64 bytesReceived, qint64 bytesTotal )  qt也有提供下载文件的进度

}



void Dialog::replyFinished(QNetworkReply *reply){

    //获取响应的信息，状态码为200表示正常

    QVariant status_code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);



    //无错误返回

    if(reply->error() == QNetworkReply::NoError)

    {

        download_Btn->setText("success");

        QByteArray bytes = reply->readAll();

        QString result(bytes);  //转化为字符串

        qDebug()<<result;

    }

    else

    {

        //处理错误

         download_Btn->setText("failed");

    }



    reply->deleteLater();//要删除reply，但是不能在repyfinished里直接delete，要调用deletelater;



}



void Dialog::onUploadProgress(qint64 bytesSent, qint64 butesTotal){

}