C / C++ / MFC

void CSimpleChatClientDlg::OnBnClickedButton1()
{
	CFileDialog FileDialog(TRUE,
                         "*.*",
                         NULL,
                         OFN_HIDEREADONLY,
						 "Any Files (*.*)|*.*||");

	if(FileDialog.DoModal() == IDOK)
	{
		UpdateData(TRUE);
		CString PathName ="SHARE:ALL:" + FileDialog.GetPathName();
		int Len=PathName.GetLength();
		char* sendBuff=new char[Len+1];
		strcpy(sendBuff,LPCTSTR(PathName));
		//Send  pathName first
		send(sClient,(char*)&Len,sizeof(Len),0);
		send(sClient,(char*)sendBuff,Len,0);
		//m_msgString+=m_user+":"+m_chatString+"\r\n";
		//m_chatString="";
		long nRead = 0;
		BYTE byBuffer[BUFFER_SIZE];   // Only build this once
		CString strPath = FileDialog.GetPathName();				
		CFile myFile;
		myFile.Open(strPath, CFile::modeRead | CFile::typeBinary);
		long fileLen = myFile.GetLength();
		//Send fileLen first
		send(sClient,(char*)&fileLen,sizeof(fileLen),0);
		
		int count = 0;
   		while (true)
   		{			
     		nRead = myFile.Read( byBuffer, BUFFER_SIZE );
			if(nRead > 0)
			{
				if(nRead < BUFFER_SIZE)
					send(sClient,(char*)&byBuffer,fileLen,0);
				else					
					send(sClient,(char*)&byBuffer,BUFFER_SIZE,0);
			}
			else
				break;
				
		}
			
		// Clean up
		myFile.Close(); 
		UpdateData(FALSE);
		delete sendBuff;
	}	
}

if(des_name.Compare("SHARE")==0)
{
        i=Cbuff.Find(':');
	des_name=Cbuff.Left(i);
	mess=Cbuff.Right(Cbuff.GetLength() - i - 1);
	if(des_name.Compare("ALL")==0) // share conference
	{																			
	CFile file;
	file.Open(mess,CFile::modeWrite | CFile::typeBinary);
	long lenFile=recv(sock.sk,buffer,buffLength,0);
	long nfilerecv=0;
	while(nfilerecv < lenFile)
	{
	        //receive byte
		nfilerecv += recv(sock.sk,buffer,buffLength,0);
	}
		m_msgString+=name_array[i_send];
		m_msgString+=":";
		m_msgString+=mess;
		m_msgString+="\r\n";
		UpdateData(FALSE);
	}
	else
		UpdateData(FALSE);

		delete buffer;
		return;
	}