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#*******************************************************
# MYCPLUS Sample Code - http://www.mycplus.com *
# *
# This code is made available as a service to our *
# visitors and is provided strictly for the *
# purpose of illustration. *
# *
# Please direct all inquiries to saqib at mycplus.com *
#******************************************************/
// Module Name: Sender.c
//
// Description:
// This sample sends UDP datagrams to the specified recipient.
// The -c option first calls connect() to associate the
// recipient's IP address with the socket handle so that the
// send() function can be used as opposed to the sendto() call.
//
// Compile:
// cl -o Sender Sender.c ws2_32.lib
//
// Command line options:
// sender [-p:int] [-r:IP] [-c] [-n:x] [-b:x] [-d:c]
// -p:int Remote port
// -r:IP Recipient's IP address or hostname
// -c Connect to remote IP first
// -n:x Number of times to send message
// -b:x Size of buffer to send
// -d:c Character to fill buffer with
//
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#define DEFAULT_PORT 5150
#define DEFAULT_COUNT 25
#define DEFAULT_CHAR 'a'
#define DEFAULT_BUFFER_LENGTH 64
BOOL bConnect = FALSE; // Connect to recipient first
int iPort = DEFAULT_PORT; // Port to send data to
char cChar = DEFAULT_CHAR; // Character to fill buffer
DWORD dwCount = DEFAULT_COUNT, // Number of messages to send
dwLength = DEFAULT_BUFFER_LENGTH; // Length of buffer to send
char szRecipient[128]; // Recipient's IP or hostname
//
// Function: usage
//
// Description:
// Print usage information and exit
//
void usage()
{
printf("usage: sender [-p:int] [-r:IP] "
"[-c] [-n:x] [-b:x] [-d:c]\n\n");
printf(" -p:int Remote port\n");
printf(" -r:IP Recipients IP address or hostname\n");
printf(" -c Connect to remote IP first\n");
printf(" -n:x Number of times to send message\n");
printf(" -b:x Size of buffer to send\n");
printf(" -d:c Character to fill buffer with\n\n");
ExitProcess(1);
}
//
// Function: ValidateArgs
//
// Description:
// Parse the command line arguments, and set some global flags to
// indicate what actions to perform
//
void ValidateArgs(int argc, char **argv)
{
int i;
for(i = 1; i < argc; i++)
{
if ((argv[i][0] == '-') || (argv[i][0] == '/'))
{
switch (tolower(argv[i][1]))
{
case 'p': // Remote port
if (strlen(argv[i]) > 3)
iPort = atoi(&argv[i][3]);
break;
case 'r': // Recipient's IP addr
if (strlen(argv[i]) > 3)
strcpy(szRecipient, &argv[i][3]);
break;
case 'c': // Connect to recipients IP addr
bConnect = TRUE;
break;
case 'n': // Number of times to send message
if (strlen(argv[i]) > 3)
dwCount = atol(&argv[i][3]);
break;
case 'b': // Buffer size
if (strlen(argv[i]) > 3)
dwLength = atol(&argv[i][3]);
break;
case 'd': // Character to fill buffer
cChar = argv[i][3];
break;
default:
usage();
break;
}
}
}
}
//
// Function: main
//
// Description:
// Main thread of execution. Initialize Winsock, parse the command
// line arguments, create a socket, connect to the remote IP
// address if specified, and then send datagram messages to the
// recipient.
//
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET s;
char *sendbuf = NULL;
int ret,
i;
SOCKADDR_IN recipient;
// Parse the command line and load Winsock
//
ValidateArgs(argc, argv);
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
{
printf("WSAStartup failed!\n");
return 1;
}
// Create the socket
//
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == INVALID_SOCKET)
{
printf("socket() failed; %d\n", WSAGetLastError());
return 1;
}
// Resolve the recipient's IP address or hostname
//
recipient.sin_family = AF_INET;
recipient.sin_port = htons((short)iPort);
if ((recipient.sin_addr.s_addr = inet_addr(szRecipient))
== INADDR_NONE)
{
struct hostent *host=NULL;
host = gethostbyname(szRecipient);
if (host)
CopyMemory(&recipient.sin_addr, host->h_addr_list[0],
host->h_length);
else
{
printf("gethostbyname() failed: %d\n", WSAGetLastError());
WSACleanup();
return 1;
}
}
// Allocate the send buffer
//
sendbuf = GlobalAlloc(GMEM_FIXED, dwLength);
if (!sendbuf)
{
printf("GlobalAlloc() failed: %d\n", GetLastError());
return 1;
}
memset(sendbuf, cChar, dwLength);
//
// If the connect option is set, "connect" to the recipient
// and send the data with the send() function
//
if (bConnect)
{
if (connect(s, (SOCKADDR *)&recipient,
sizeof(recipient)) == SOCKET_ERROR)
{
printf("connect() failed: %d\n", WSAGetLastError());
GlobalFree(sendbuf);
WSACleanup();
return 1;
}
for(i = 0; i < dwCount; i++)
{
ret = send(s, sendbuf, dwLength, 0);
if (ret == SOCKET_ERROR)
{
printf("send() failed: %d\n", WSAGetLastError());
break;
}
else if (ret == 0)
break;
// send() succeeded!
}
}
else
{
// Otherwise, use the sendto() function
//
for(i = 0; i < dwCount; i++)
{
ret = sendto(s, sendbuf, dwLength, 0,
(SOCKADDR *)&recipient, sizeof(recipient));
if (ret == SOCKET_ERROR)
{
printf("sendto() failed; %d\n", WSAGetLastError());
break;
}
else if (ret == 0)
break;
// sendto() succeeded!
}
}
closesocket(s);
GlobalFree(sendbuf);
WSACleanup();
return 0;
}
/************************* End of Sender ***********************/
/************************************************************/
/************************** Receiver *************************/
// Module Name: Receiver.c
//
// Description:
// This sample receives UDP datagrams by binding to the specified
// interface and port number and then blocking on a recvfrom()
// call
//
// Compile:
// cl -o Receiver Receiver.c ws2_32.lib
//
// Command line options:
// sender [-p:int] [-i:IP][-n:x] [-b:x]
// -p:int Local port
// -i:IP Local IP address to listen on
// -n:x Number of times to send message
// -b:x Size of buffer to send
//
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#define DEFAULT_PORT 5150
#define DEFAULT_COUNT 25
#define DEFAULT_BUFFER_LENGTH 4096
int iPort = DEFAULT_PORT; // Port to receive on
DWORD dwCount = DEFAULT_COUNT, // Number of messages to read
dwLength = DEFAULT_BUFFER_LENGTH; // Length of receiving buffer
BOOL bInterface = FALSE; // Use an interface other than
// default
char szInterface[32]; // Interface to read datagrams from
//
// Function: usage:
//
// Description:
// Print usage information and exit
//
void usage()
{
printf("usage: sender [-p:int] [-i:IP][-n:x] [-b:x]\n\n");
printf(" -p:int Local port\n");
printf(" -i:IP Local IP address to listen on\n");
printf(" -n:x Number of times to send message\n");
printf(" -b:x Size of buffer to send\n\n");
ExitProcess(1);
}
//
// Function: ValidateArgs
//
// Description:
// Parse the command line arguments, and set some global flags to
// indicate what actions to perform
//
void ValidateArgs(int argc, char **argv)
{
int i;
for(i = 1; i < argc; i++)
{
if ((argv[i][0] == '-') || (argv[i][0] == '/'))
{
switch (tolower(argv[i][1]))
{
case 'p': // Local port
if (strlen(argv[i]) > 3)
iPort = atoi(&argv[i][3]);
break;
case 'n': // Number of times to receive message
if (strlen(argv[i]) > 3)
dwCount = atol(&argv[i][3]);
break;
case 'b': // Buffer size
if (strlen(argv[i]) > 3)
dwLength = atol(&argv[i][3]);
break;
case 'i': // Interface to receive datagrams on
if (strlen(argv[i]) > 3)
{
bInterface = TRUE;
strcpy(szInterface, &argv[i][3]);
}
break;
default:
usage();
break;
}
}
}
}
//
// Function: main
//
// Description:
// Main thread of execution. Initialize Winsock, parse the command
// line arguments, create a socket, bind it to a local interface
// and port, and then read datagrams.
//
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET s;
char *recvbuf = NULL;
int ret,
i;
DWORD dwSenderSize;
SOCKADDR_IN sender,
local;
// Parse arguments and load Winsock
//
ValidateArgs(argc, argv);
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("WSAStartup failed!\n");
return 1;
}
// Create the socket and bind it to a local interface and port
//
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == INVALID_SOCKET)
{
printf("socket() failed; %d\n", WSAGetLastError());
return 1;
}
local.sin_family = AF_INET;
local.sin_port = htons((short)iPort);
if (bInterface)
local.sin_addr.s_addr = inet_addr(szInterface);
else
local.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(s, (SOCKADDR *)&local, sizeof(local)) == SOCKET_ERROR)
{
printf("bind() failed: %d\n", WSAGetLastError());
return 1;
}
// Allocate the receive buffer
//
recvbuf = GlobalAlloc(GMEM_FIXED, dwLength);
if (!recvbuf)
{
printf("GlobalAlloc() failed: %d\n", GetLastError());
return 1;
}
// Read the datagrams
//
for(i = 0; i < dwCount; i++)
{
dwSenderSize = sizeof(sender);
ret = recvfrom(s, recvbuf, dwLength, 0,
(SOCKADDR *)&sender, &dwSenderSize);
if (ret == SOCKET_ERROR)
{
printf("recvfrom() failed; %d\n", WSAGetLastError());
break;
}
else if (ret == 0)
break;
else
{
recvbuf[ret] = '\0';
printf("[%s] sent me: '%s'\n",
inet_ntoa(sender.sin_addr), recvbuf);
}
}
closesocket(s);
GlobalFree(recvbuf);
WSACleanup();
return 0;
}
/************************* End of Receiver **********************/
|
Ну и посмотри ссылки тут. --------------------
Единственный способ определить границы возможного - это выйти за эти границы, в невозможное.
Артур Кларк. |
отправка широковещательных дейтаграмм, не блокирующие сокеты 
Дата 5.6.2007, 16:32 (
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