[Qt + .net web api] 通过表单的形式传输文件 可以是图片 视频 文本等_qhttppart 上传视频

直接贴代码 自己看 不赘述

qt端：

    /// 发送图片
    QString picpath = "E:\\PROject\\Qt\\new1008\\ProCocaCola\\savePic\\1.png";
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QHttpPart imagePart;
    imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
    imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"pic\"; filename=\""+ picpath + "\"")); // file为后端定义的key，filename即为文件名
    QFile *file = new QFile(picpath);//pathbuf1 为文件路径
    file->open(QIODevice::ReadOnly);
    imagePart.setBodyDevice(file);
    file->setParent(multiPart);
    multiPart->append(imagePart);

    //数据 表单
    QHttpPart data_part;
    data_part.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("text/plain"));
    //在name属性中设置域名，在这里是userId
    data_part.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"event\""));
    //在body体中设置值，在这里是999
    data_part.setBody("中文");
    multiPart->append(data_part);

    QUrl url("https://localhost:44356/api/SQLite/Post_UpLoadImageFiles");
    QNetworkRequest NetRequest;
    NetRequest.setUrl(url);

    QNetworkAccessManager NetAccessManager;
    QNetworkReply* NetReply = NULL;
    //https 添加以下
    QSslConfiguration config;
    QSslConfiguration conf = NetRequest.sslConfiguration();
    conf.setPeerVerifyMode(QSslSocket::VerifyNone);
    conf.setProtocol(QSsl::TlsV1SslV3);
    NetRequest.setSslConfiguration(conf);

    NetReply = NetAccessManager.post(NetRequest, multiPart);

    QEventLoop loop;
    connect(NetReply, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exec();
    //exec()之前语句会一直处于运行中，直到QEventLoop退出  实现控制程序运行进程 让replay接收完成再做处理

    //qDebug()<<"out3:"<<NetReply->header(QNetworkRequest::KnownHeaders::ContentTypeHeader);

    //记录httpCode
    int httpsCode = NetReply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
    qDebug()<<"httpCode"<<httpsCode;

    QNetworkReply::NetworkError e = NetReply->error();
    QString replyStr = NetReply->readAll();
    qDebug()<<"replyStr"<<replyStr;
    if (e)
    {
        QString errorMessage = NetReply->errorString();
        qDebug()<<"errorMessage:"<<errorMessage;
    }
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api 端：

        public string Post_UpLoadImageFiles()   //多个参数
        {
            var files = HttpContext.Request.Form.Files;
            if (files.Count != 0)//如果存在文件
            {
                var text = HttpContext.Request.Form.Files[0].OpenReadStream();//获取到文件流


                string strPath = "E:\\PROject\\Qt\\new1008\\ProCocaCola\\savePic\\receive.png";//这里要注意的是先要建立File文件夹，不然会报错，也可以自己写一个检测文件夹，这里就先不赘述
                StreamHelp.StreamToFile(text, strPath);//需要用到下一步的帮助类将其保存为文件

                var event_ = HttpContext.Request.Form["event"];
                return event_.ToString();
            }
            else
                return "no";
        }
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更新：
请求url加参数 适用于接口带参数的api

strUrl = "https://localhost:44356/api/SQLite/Post_uploadImageFiles_2?AlarmID=zhao";
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//表单的方式
void MainWindow::on_Btn_postPIc_clicked()  //url带参数
{
    QString strUrl;
    QString strerrorMessage;
    QString strReply;

    /// 发送图片
    QString picpath = "E:\\PROject\\Qt\\new1008\\ProCocaCola\\savePic\\2.png";
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QHttpPart imagePart;
    imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
    QFileInfo fileinfo = QFileInfo(picpath);
    imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"pic\"; filename=\""+ fileinfo.fileName() + "\"")); // file为后端定义的key，filename即为文件名
    QFile *file = new QFile(picpath);//pathbuf1 为文件路径
    file->open(QIODevice::ReadOnly);
    imagePart.setBodyDevice(file);
    file->setParent(multiPart);
    multiPart->append(imagePart);

    //strUrl = "http://154.8.139.34:5000/api/Alarm/Image?alarmID=1";
    strUrl = "https://localhost:44356/api/SQLite/Post_picture?alarmID=1";
    NetWorkHelper netHelper;
    netHelper.POSTToApibyForm(strUrl,multiPart,strerrorMessage,strReply);
    qDebug()<<"strReply"<<strReply;
}
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        /// <summary>
        /// 上传图片表单 
        /// </summary>
        [Route("Post_picture")]
        [HttpPost]   //增
        public int Post_picture(int alarmID,IFormCollection files)   //多个参数
        {
            int result = -1;
            FormFileCollection fileCollection = (FormFileCollection)files.Files;
            if (fileCollection.Count > 0)
            {
                IFormFile file = fileCollection[0];
                StreamReader reader = new StreamReader(file.OpenReadStream());
                string content = reader.ReadToEnd();
                string name = file.FileName;
                string filename = name;
                if (System.IO.File.Exists(filename))
                {
                    System.IO.File.Delete(filename);
                }
                using (FileStream fs = System.IO.File.Create(filename))
                {
                    file.CopyTo(fs);
                    fs.Flush();
                }
                result = 0;
            }
            return result;
        }
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