QT之旅——post 文件
最近要用到QT里面的qhttp或者QNetworkAccessManager post一个文件到后台。post一个简单的form还是比较容易，from如果是multipart/form-data类型的话，那就比较复杂，网上收集了一些资料，记录了下来。
首先一个页面代码如下：
<html> <head></head> <body> <h2>上传文件</h2> <form action="/gcd/uploadFileAction.json" method="post" enctype="multipart/form-data"> 文件名称（name）：<input type="text" name="name"><br> 文件是否可见（visibility）：<input type="text" name="visibility">（0:不可见；1：可见）<br> *文件内容：<input type="file" name="file"> <input type="submit"> </form> </body> </html>
QT的post代码如下：
bool uploadFile(std::string localPath)
{
if(m_strFname == "")
return false;
QFile file(QString(localPath.c_str()));
if (!file.open(QIODevice::ReadOnly))
{
file.close();
return false;
}
QUrl url = QString(“your host”);
url.setPort(1234);
url.setPath(“your http path”);
QString crlf="\r\n";
qsrand(QDateTime::currentDateTime().toTime_t());
QString b=QVariant(qrand()).toString()+QVariant(qrand()).toString()+QVariant(qrand()).toString();
QString boundary="---------------------------"+b;
QString endBoundary=crlf+"--"+boundary+"--"+crlf;
QString contentType="multipart/form-data; boundary="+boundary;
boundary="--"+boundary+crlf;
QByteArray bond=boundary.toAscii();
QByteArray send;
send.append(bond);
boundary = crlf + boundary;
bond = boundary.toAscii();
send.append(QString("Content-Disposition: form-data; name=\"name\""+crlf).toAscii());
send.append(QString("Content-Transfer-Encoding: 8bit"+crlf).toAscii());
send.append(crlf.toAscii());
send.append(QString("文件名称").toUtf8());
send.append(bond);
send.append(QString("Content-Disposition: form-data; name=\"visibility\""+crlf).toAscii());
send.append(QString("Content-Transfer-Encoding: 8bit"+crlf).toAscii());
send.append(crlf.toAscii());
send.append(QString("0").toUtf8());
send.append(bond);
send.append(QString("Content-Disposition: form-data; name=\"file\"; filename=\""+QString(localPath.c_str())+"\""+crlf).toAscii());
//send.append(QString("Content-Type: "+fileMimes.at(i)+crlf+crlf).toAscii());
send.append(QString("Content-Transfer-Encoding: 8bit"+crlf).toAscii());
send.append(crlf.toAscii());
send.append(file.readAll());
send.append(endBoundary.toAscii());
file.close();
QNetworkRequest req(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, contentType.toAscii());
req.setHeader(QNetworkRequest::ContentLengthHeader, QVariant(send.size()).toString());
QNetworkAccessManager qam;
qam.post(req,send);
return true;
}
可能有问题，先到这里吧。
