QFtp:upload file to server

[ensky_cy]

I am confusing of uploading file to server.
I want know how I specified the path in the server.The file ,that will be uploaded,should be open,and copy to memory,then upload to the file which I created in the server...
May be I don't explain it clear,I just want to konw the process how the file upload to the server.
Thank you!!

int i = 0;
    QString filename;
    QString files = QFileDialog::getOpenFileName(this, tr("Select File"),
                                                    "D://");
 
         if (files.isEmpty())
             return;
 
             while(files.indexOf("/", i) != (-1))  //find the file name not include the full url
                 i = files.indexOf("/",i) + 1;
             while(i < files.size())
             {
                 filename.append(files.at(i));
                 i++;
             }
 
             file = new QFile(filename);
             Q_ASSERT(file != NULL);
 
             if(!file->open(QIODevice::ReadWrite)) //finished create the file in the debug file
             {
                 qDebug() << "opern err" << file->fileName();
                 return;
             }
 
             ftp->put(file,filename);

int i = 0;
    QString filename;
    QString files = QFileDialog::getOpenFileName(this, tr("Select File"),
                                                    "D://");

         if (files.isEmpty())
             return;

             while(files.indexOf("/", i) != (-1))  //find the file name not include the full url
                 i = files.indexOf("/",i) + 1;
             while(i < files.size())
             {
                 filename.append(files.at(i));
                 i++;
             }

             file = new QFile(filename);
             Q_ASSERT(file != NULL);

             if(!file->open(QIODevice::ReadWrite)) //finished create the file in the debug file
             {
                 qDebug() << "opern err" << file->fileName();
                 return;
             }

             ftp->put(file,filename);

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After the ftp->put , I find there is no file in the server directory.