CFileDialog fileDlg (TRUE); 
FileDlg. M_ofn. LpstrTitle="open file"; 
FileDlg. M_ofn. LpstrFilter="Text Files (*.txt) \ 0 *. TXT \ 0 all Files (*. *) \ 0 *. * \ \ 0 0"; 
If (IDOK==fileDlg. DoModal ()) 
{
CFile file (fileDlg GetFileName (), CFile: : modeRead); 
Cstrings path=""; 
Path=fileDlg. GetPathName ();//the file path name 
DwFileLen=file. GetLength (); 
SetDlgItemText (IDC_EDIT_SEND, path); 

Char * pbufs=new char [dwFileLen]; 
File. Read (pbufs dwFileLen); 
If (SetTimer (1100, NULL)) 
{
Int tt; 
Tt=send (sockClient, pbufs dwFileLen, 0). 
If (SOCKET_ERROR==tt) 
{
MessageBox (" failure "); 
} 
SetDlgItemInt (IDC_EDIT_sum1 dwFileLen); 
} 
} 

 SOCKET sock=((RECVPARAM *) lpParameter) - & gt; The sock. 
HWND HWND=((RECVPARAM *) lpParameter) - & gt; The HWND; 
The delete lpParameter; 
SOCKADDR_IN addrClient; 
Int len=sizeof (SOCKADDR); 
Int retval; 
While (TRUE) 
{
The SOCKET sockConn=accept (the sock, (SOCKADDR *) & amp; AddrClient, & amp; Len); 
Char recvBuf [102400]. 
Char sendBuf [200]. 
Sprintf (sendBuf, "% s", inet_ntoa (addrClient. Sin_addr)); 
Send (sockConn, sendBuf, strlen (sendBuf) + 1, 0). 
Sleep (1000); 
Retval=recv (102400, 0 sockConn, recvBuf); 
If (SOCKET_ERROR==retval) 
{
AfxMessageBox (" receiving data failure "); 
break; 
} 
If (0==retval) 
{
break; 
} 
CFileDialog fileDlg (FALSE); 
FileDlg. M_ofn. LpstrFilter="All Files (*. *) \ 0 *. TXT \ \ 0 0 *. * \ \ 0 0"; 
FileDlg. M_ofn. LpstrDefExt="BMP"; 
FileDlg. M_ofn. LpstrTitle="save receive file"; 
If (IDOK==fileDlg. DoModal ()) 
{
CFile file (fileDlg GetFileName (), CFile: : modeCreate | CFile: : modeWrite); 
File. The Write (recvBuf, retval); 
File. The Close (); 
}