在Qt4上使用POST方法上传文件

时间:2010-04-13 08:14:34

标签: qt post upload

我正在寻找如何使用Qt上的HTTP POST方法将文件上传到服务器的基本代码示例。

我的任务:我有简单的Qt程序,我需要从本地主机中选择任何图像文件并将其上传到服务器。选择部分和GUI很简单,我已经完成了,但是使用POST上传我很困惑。另外我不得不说,没有授权上传文件。

如果有人已经在查看此主题吗?

PS:我之所以要求而不是自我编码的原因是时间,我需要快速获得这种方法。

谢谢,我方面的所有成功解决方案都会发布给其他人。

已添加:这是我的代码,但尚无法解决。上传位于here的网站。

void    CDialog::on_uploadButton_clicked() {

    QFileInfo fileInfo(absPathLineEdit->text());

    if (!fileInfo.exists()) {
        QMessageBox::information(this, 
            tr("Information"), 
            tr("File doesn't exists! Please, select another image."));
        return;
    }

    file = new QFile(fileInfo.filePath());
    if (!file->open(QIODevice::ReadOnly)) {
        QMessageBox::information(this,
            tr("Information"),
            tr("Unable to open file for reading!"));
        return;
    }

    QString host = "http://data.cod.ru";

    QUrl url(host);

    QHttp::ConnectionMode mode = QHttp::ConnectionModeHttp;
    http->setHost(url.host(), mode, (url.port() == -1) ? 80 : url.port());

    QHttpRequestHeader header("POST", "/", 1, 1);
    header.setValue("Host", "data.cod.ru");
    header.setValue("Content-type", "multipart/form-data, boundary=AaB03x");
    header.setValue("Cache-Control", "no-cache");
    header.setValue("Accept", "*/*");

    QByteArray bytes(fileInfo.filePath().toUtf8());
    QByteArray totalBytes;
    totalBytes.append("--AaB03x\r\n");
    totalBytes.append("Content-Disposition: form-data; name=\"email\"\r\n");
    totalBytes.append("\r\n");
    totalBytes.append("billgates@microsoft.com\r\n");
    totalBytes.append("--AaB03x\r\n");
    totalBytes.append("Content-Disposition: form-data; name=\"photo\"; filename=\"" + bytes+ "\"\r\n");
    totalBytes.append("Content-Transfer-Encoding: binary\r\n\r\n");
    totalBytes.append(file->readAll());
    totalBytes.append("\r\n");
    totalBytes.append("--AaB03x--");

    header.setContentLength(totalBytes.length());

    httpRequestAborted = false;
    httpGetId = http->request(header, totalBytes);

    file->close();
}

并阅读以下答案功能:

void    CDialog::httpRequestFinished(int requestId, bool error) {

    if (requestId != httpGetId)
        return;

    if (httpRequestAborted) {
        if (file) {
            file->close();
//          file->remove();
//          delete file;
            file = 0;
        }
        return;
    }

    if (requestId != httpGetId)
        return;

    file->close();

    if (error) {
//      file->remove();
        QMessageBox::information(this, tr("HTTP"),
            tr("Download failed: %1.")
            .arg(http->errorString()));
    } else {
        QByteArray data = http->readAll();
        QFile *dataFile = new QFile("answer.txt");
        dataFile->open(QIODevice::WriteOnly | QIODevice::Text);
        dataFile->write(data);
        dataFile->flush();
        dataFile->close();
    }

//  delete file;
    file = 0;
}

4 个答案:

答案 0 :(得分:10)

我看到你正在尝试使用QHTTP和QHttpRequestHeader类。 QT文档说这些已被弃用:

  

这个类已经过时了。提供   保持旧的源代码工作。我们   强烈建议不要使用它   新代码。

所以,正如之前所建议的那样;我建议你使用QNetworkAccessManager来做你想做的事情

至于你原来的问题;你仍然可以使用QHTTP上传文件;我相信实际的请求标头结构取决于您尝试访问的特定网站。在这种情况下,像wireshark这样的工具会有很大的帮助。请检查下面的代码是否适合您,它应该从主文件夹上传test1.jpg文件,如果302响应返回,则将其链接转储到服务器上。

void MainWindow::on_pushButton_clicked()
{   
    http = new QHttp(this); // http declared as a member of MainWindow class 
    connect(http, SIGNAL(requestFinished(int,bool)), SLOT(httpRequestFinished(int, bool)));

    QString boundary = "---------------------------723690991551375881941828858";

    // action
    QByteArray data(QString("--" + boundary + "\r\n").toAscii());
    data += "Content-Disposition: form-data; name=\"action\"\r\n\r\n";
    data += "file_upload\r\n";

    // file
    data += QString("--" + boundary + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"sfile\"; filename=\"test1.jpg\"\r\n";
    data += "Content-Type: image/jpeg\r\n\r\n";

    QFile file("/home/test1.jpg");
    if (!file.open(QIODevice::ReadOnly))
        return;

    data += file.readAll();
    data += "\r\n";

    // password
    data += QString("--" + boundary + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"password\"\r\n\r\n";
    //data += "password\r\n"; // put password if needed
    data += "\r\n";

    // description
    data += QString("--" + boundary + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"description\"\r\n\r\n";
    //data += "description\r\n"; // put description if needed
    data += "\r\n";

    // agree
    data += QString("--" + boundary + "\r\n").toAscii();
    data += "Content-Disposition: form-data; name=\"agree\"\r\n\r\n";
    data += "1\r\n";

    data += QString("--" + boundary + "--\r\n").toAscii();

    QHttpRequestHeader header("POST", "/cabinet/upload/");
    header.setValue("Host", "data.cod.ru");
    header.setValue("User-Agent", "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100401 Ubuntu/9.10 (karmic) Firefox/3.5.9");
    header.setValue("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    header.setValue("Accept-Language", "en-us,en;q=0.5");
    header.setValue("Accept-Encoding", "gzip,deflate");
    header.setValue("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    header.setValue("Keep-Alive", "300");
    header.setValue("Connection", "keep-alive");
    header.setValue("Referer", "http://data.cod.ru/");

    //multipart/form-data; boundary=---------------------------723690991551375881941828858

    header.setValue("Content-Type", "multipart/form-data; boundary=" + boundary);
    header.setValue("Content-Length", QString::number(data.length()));

    http->setHost("data.cod.ru");
    http->request(header, data);

    file.close();
}

void MainWindow::httpRequestFinished(int, bool)
{
    QHttpResponseHeader responce = http->lastResponse();
    if (responce.statusCode()==302)
    {
        qDebug() << "file accepted; get it from:";
        qDebug() << "data.cod.ru" << responce.value("Location");
    }
}

在MainWindow类的信号部分声明的httpRequestFinished

希望这有帮助,privet;)

答案 1 :(得分:9)

另外,我今天发现了很好的代码:link text

它是基于Qt4的上传/下载应用程序,里面有QNetworkAccessManager管理的全套POST标题,所以对初学者来说非常有帮助。

拥有者:  stiff.ru

提交者:  hoxnox

答案 2 :(得分:1)

使用QNetworkAccessManager。

manager.post(your_qhttpnetworkrequest, your_image_qfile);

答案 3 :(得分:-2)

def cont(row,param):
    if row['SPEED'] == 0 and row['SPEED_END'].shift(1) == 0:
        val = row[param].shift(1)
    else:
        val = row[param]
    return val

df['BEGIN'] = df.apply(cont, param='BEGIN', axis=1)

data.append(“Content-Disposition:form-data; name = \”photo \“; filename = \” - \“\ r \ n”);     data.append(“Content-Type:image / jpg \ r \ n \ r \ n”);     //data.append("Content-Transfer-Encoding:binary \ r \ n“);     data.append(字节);     data.append( “\ r \ n”);     data.append( “ - Asrf456BGe4h \ r \ n”);