I have a peer-to-peer (P2P) version of the UDP broadcast program, messages can be sent to the other host to run this program in the local area network (LAN), but I want to test in the unit, sends a message to the host on several different copies (each copy of the binding of different port), can be achieved, the attached code is as follows:

 void CUDPDlg: : OnBroad () 
{
The UpdateData (true);//the input data to control by the control variables 
Struct sockaddr_in toaddr;//store the structure of the target address variable 

Memset ((void *) & amp; Toaddr, 0, sizeof (addr));//toaddr each field values all s 
Toaddr. Sin_family=AF_INET;//specifies the protocol family to aAF_INET 
Toaddr. Sin_addr. S_addr=INADDR_BROADCAST;//specify the sending address is broadcast address 
Toaddr. Sin_port=htons (port 1); 
M_List. AddString (" I said: "+ m_Edit);//will send content added to the ListBox control 
Sendto (brdsock, m_Edit, m_Edit GetLength (), 0, (sockaddr *) & amp; Toaddr, sizeof (toaddr));//send data to the communication to end 

} 

Void CUDPDlg: : OnSend () 
{
The UpdateData (true);//the input data to control by the control variables 
Struct sockaddr_in toaddr;//store the structure of the target address variable 
DWORD bwaddr;//store destination IP address of the variable 

M_IPCtrl. GetAddress (bwaddr);//by IP address space variable m_IP get target IP address 

Memset ((void *) & amp; Toaddr, 0, sizeof (addr));//toaddr each field values all s 
Toaddr. Sin_family=AF_INET;//specifies the protocol family to aAF_INET 
Toaddr. Sin_addr. S_addr=htonl (bwaddr); 
Toaddr. Sin_port=htons (port); 
M_List. AddString (" native: & gt;" + m_Edit);//will send content added to the ListBox control 
Sendto (sock, m_Edit, m_Edit GetLength (), 0, (sockaddr *) & amp; Toaddr, sizeof (toaddr));//send data to the communication to end 
} 

Afx_msg LRESULT CUDPDlg: : OnRecvmessage (WPARAM WPARAM, LPARAM LPARAM) 
{
Char recvBuffer [1000]. 
Cstrings STR. 
Int len=sizeof (fromaddr); The last parameter in//recvfrom function, must be initialise 
Int size=recvfrom (sock, recvBuffer, sizeof (recvBuffer), 0, (sockaddr *) & amp; Fromaddr, & amp; Len);//receiving data 
If (size> 0) 
{
RecvBuffer [size]='\ 0';//add string terminator at the end of the string '\ 0' 
STR. The Format (" messages from % s: % d: % s ", inet_ntoa (fromaddr. Sin_addr), ntohs (fromaddr. Sin_port), recvBuffer); 
M_List. AddString (STR);//added to the ListBox control 
} 
return 0; 
} 

Void CUDPDlg: : OnCreate () 
{
If ((the sock=socket (AF_INET, SOCK_DGRAM, 0)) & lt; 0) 
{
MessageBox (" failed to create a socket!" ); 
//return true; 
} 
If ((brdsock=socket (AF_INET, SOCK_DGRAM, 0)) & lt; 0) 
{
MessageBox (" failed to create a socket!" ); 
//return true; 
} 
//to a datagram socket binding address, in order to receive broadcast information 
Memset ((void *) & amp; Addr, 0, sizeof (addr));//addr each field values all s 
Addr. Sin_family=AF_INET;//specifies the protocol family to AF_INET 
Addr. Sin_port=htons (port);//the specified UDP port number 
Addr. Sin_addr. S_addr=htonl (INADDR_ANY);//specify the IP address 
While (bind the sock, (LPSOCKADDR) & amp; Addr, sizeof (addr))!=0) 
{
Port++; 
Addr. Sin_port=htons (port);//the specified UDP port number 
//MessageBox (" binding failed!" ); 
//closesocket (sock); 
//return true; 
} 
//set the datagram socket m_DGramSocket radio properties, make it can broadcast information 
BOOL yes=TRUE; 
Int ret=setsockopt (brdsock, SOL_SOCKET, SO_BROADCAST, (char *) & amp; Yes, sizeof (BOOL)); 
/* * * for m_DGramSocket registered FD_READ events, events will send WM_RECVMESSAGE news * * */
If (WSAAsyncSelect (sock, m_hWnd, WM_RECVMESSAGE FD_READ)!=0) 
{
MessageBox (" socket asynchronous event registration failed!" ); 
Closesocket (sock); 
} 


} 

 class CUDPDlg: public CDialog 
{
//Construction 
Public: 
PParent CUDPDlg (CWnd *=NULL);//standard constructor 
The SOCKET sock, brdsock; 
Struct sockaddr_in addr, fromaddr; 
//Dialog Data 
//{{AFX_DATA (CUDPDlg) 
Enum {IDD=IDD_UDP_DIALOG}; 
CListBox m_List; 
CIPAddressCtrl m_IPCtrl; 
Cstrings m_Edit; 
Cstrings m_Port; 
//}} AFX_DATA 

CodePudding user response:

This is not very easy to test, the next udo tools can try

CodePudding user response:

I asked the WinSock UDP programming can sends a message to the host several different copies of the program (each copy of the binding of different port), how to write program code,

CodePudding user response:

UDP broadcast programming can sends a message to the host on several different copies of the program