File Transfer

[Ammu_Putta]

Hi All,

Has anyone of u developed a class which can Transfer a File across LAN.

I have a client Server Application which can Send and Receive messages between them. Now i want to implement the File Transfer.

Looking forward to ur valuable Suggestions..

Thanks.

[blueday54555]

there are many methods
use the search function "lan file transfer"

[mjvalan]

Consider your file as some long message. Read the file and send as a string to the other system, but you ve to retrieve the file name, propeties... and send them also.

In the other (receiver) side create one file with the same name and properties, write the received string into it.
( to identify the file name and properties add some tag with the msg ex: FileName:File1,FileTime:... ).

I guess some modifications to your existing code will do the above thing.

Regards
MJV

[Andreas Masur]

Well....what protocol? HTTP? FTP?

[Ejaz]

Network Transfer Of Files Using MFC's CSocket Class
File Transfer Using CSockets

Furthermore, you can get better answer from Network Programming

[Ammu_Putta]

Well....what protocol? HTTP? FTP?

Hello Sir,

FTP Would b sufficient...

Expecting ur Advice...

thanks

[Andreas Masur]

void CopyFromFTPServer()
{
  int              iRC               = 0;
  CFile            LocalFile;
  CInternetFile    *pInternetFile    = 0;
  CFtpConnection   *pFTPConnection   = 0;
  CInternetSession *pInternetSession = 0;

  pInternetSession = new CInternetSession();
  if(pInternetSession)
  {
    try
    {
      pFTPConnection = pInternetSession->GetFtpConnection(_T("ftp.server.com"), _T("username"), _T("password"));

      pInternetFile = pFTPConnection->OpenFile(_T("test.txt"));
      LocalFile.Open(_T("c:\\test.txt"), CFile::modeCreate | CFile::modeWrite);

      // Read data
      TCHAR szBuffer[50] = "";

      while((iRC = pInternetFile->Read(static_cast<void *>(szBuffer), sizeof(szBuffer))) != 0)
      {
        // Write to file
        LocalFile.Write(static_cast<const void *>(szBuffer), iRC);

        // Clear buffer
        memset(szBuffer, 0, sizeof(szBuffer));
      }
    }
    catch(CInternetException* pEx)
    {
      TCHAR szErrorMessage[1024] = "";

      pEx->GetErrorMessage(szErrorMessage, sizeof(szErrorMessage) - 1);

      AfxMessageBox(szErrorMessage, "Error");

      pEx->Delete();
    }
  }

  // If the connection is open, close it
  if(pFTPConnection)
    pFTPConnection->Close();

  delete pInternetSession;
}

void CopyToFTPServer()
{
  int              iRC               = 0;
  CFile            LocalFile;
  CInternetFile    *pInternetFile    = 0;
  CFtpConnection   *pFTPConnection   = 0;
  CInternetSession *pInternetSession = 0;

  pInternetSession = new CInternetSession();
  if(pInternetSession)
  {
    try
    {
      pFTPConnection = pInternetSession->GetFtpConnection(_T("ftp.server.com"), _T("username"), _T("password"));

      pInternetFile = pFTPConnection->OpenFile(_T("test.txt"), GENERIC_WRITE);
      LocalFile.Open(_T("c:\\test.txt"), CFile::modeRead);

      // Write data
      TCHAR szBuffer[50] = "";

      while((iRC = LocalFile.Read(static_cast<void *>(szBuffer), sizeof(szBuffer))) != 0)
      {
        // Write to file
        pInternetFile->Write(static_cast<const void *>(szBuffer), iRC) ;

        // Clear buffer
        memset(szBuffer, 0, sizeof(szBuffer));
      }
    }
    catch(CInternetException* pEx)
    {
      TCHAR szErrorMessage[1024] = "";

      pEx->GetErrorMessage(szErrorMessage, sizeof(szErrorMessage) - 1);

      AfxMessageBox(szErrorMessage, "Error");

      pEx->Delete();
    }
  }

  // If the connection is open, close it
  if(pFTPConnection)
    pFTPConnection->Close();

  delete pInternetSession;
}

[Andreas Masur]

The following is a download class which downloads a file from a FTP-Server in its own thread...

#include <memory>

class CFTPDownload
{
public:
  CFTPDownload(const char *Server,
               const char *ServerFileName,
               const char *LocalFileName,
               const char *User,
               const char* Password)
  {
    m_Server         = Server;
    m_ServerFileName = ServerFileName;
    m_ServerFileName = LocalFileName;
    m_User           = User;
    m_Password       = Password;

    // Create thread
    m_Thread = ::CreateThread(0, 0, Thread, this, 0, 0);
  }

  virtual ~CFTPDownload() { ::CloseHandle(m_Thread); }

  CString &GetCause() { return Cause; }

private:
  HANDLE  m_Thread;
  CString m_Server;
  CString m_User;
  CString m_Password;
  CString m_ServerFileName;
  CString m_LocalFileName;
  CString m_Cause;

  static UINT Thread(LPVOID Param);
};


UINT CFTPDownload::Thread(LPVOID Param)
{
  CFTPDownload *Parent = static_cast<CFTPDownload *>(Param);

  int            RC             = 0;
  bool           Success        = true;
  CFile          LocalFile;
  CInternetFile  *InternetFile  = 0;
  CFtpConnection *FTPConnection = 0;

  std::auto_ptr<CInternetSession> InternetSession(new CInternetSession());
  if(InternetSession.get())
  {
    try
    {
      FTPConnection = InternetSession->GetFtpConnection(Parent->m_Server, Parent->m_User, Parent->m_Password);

      InternetFile = FTPConnection->OpenFile(Parent->m_ServerFileName);
      LocalFile.Open(Parent->m_LocalFileName, CFile::modeCreate | CFile::modeWrite);

      // Read data
      TCHAR Buffer[50] = "";

      while((RC = InternetFile->Read(static_cast<void*>(Buffer), sizeof(Buffer))) != 0)
      {
        // Write to file
        LocalFile.Write(static_cast<const void*>(Buffer), RC);

        // Clear buffer
        memset(Buffer, 0, sizeof(Buffer));
      }
    }
    catch(CInternetException* Ex)
    {
      TCHAR Error[1024] = "";
      Ex->GetErrorMessage(Error, sizeof(Error) - 1);
      Parent->m_Cause = Error;
      Ex->Delete();
      Success = false;
    }
  }

  // If the connection is open, close it
  if(FTPConnection)
    FTPConnection->Close();

  return Success;
}

In your application you can then start a download with the following...

CFTPDownload DownloadOne("ftp.server.com", "File_A.zip", "c:\\file_a.zip", "user", "password");
CFTPDownload DownloadTwo("ftp.server.com", "File_B.zip", "c:\\file_b.zip", "user", "password");

It is of course just a small sample to give you the idea...there is no functionality added like signaling the finishing of the download etc.

[Mick]

If you are using MFC you can use the code as posted above [provide you correct the lines like]

LocalFile.Open(Parent->m_LocalFileName, CFile::modeWrite);

If you do not want use the MFC wrappers you can use the WIN32 APIs WinInet

[Andreas Masur]

If you are using MFC you can use the code as posted above [provide you correct the lines like]

LocalFile.Open(Parent->m_LocalFileName, CFile::modeWrite);

Correct with what?

[Mick]

Correct with what?

Well I realize it is a sample...but I do not think whatever local file they are writing to will already exists.

[Andreas Masur]

Well I realize it is a sample...but I do not think whatever local file they are writing to will already exists.

Okay....you mean it would be wise if one includes 'CFile::modeCreate' as well...? Done...