Пожалуйста помогите с проблемой посылки UDP через API (это необходимо по ряду причин).
В этом примере (теоретически) нужно послать UPD сообщения на тестовый адрес 127.0.0.1 используя порт 1300. Однако судя по монитору TCPView посылка идет совсем на другой порт, каждый раз разный. Но номер очень важен для меня.
Почему не удается послать на тот порт который мне необходим?
| Код |
#include <winsock2.h>
#include <stdio.h>
int main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET SendingSocket;
SOCKADDR_IN ReceiverAddr, SrcInfo;
unsigned short Port = 1300;
char *SendBuf = "Sending all my love, Sending all my love to youuu!";
int BufLength = 1024;
int len;
int TotalByteSent;
// Initialize Winsock version 2.2
if( WSAStartup(MAKEWORD(2,2), &wsaData) != 0)
{
printf("ClientS: WSAStartup failed with error %ld\n", WSAGetLastError());
WSACleanup();
return -1;
}
else
printf("ClientS: The Winsock DLL status is %s.\n", wsaData.szSystemStatus);
// Create a new socket to receive datagrams on.
SendingSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (SendingSocket == INVALID_SOCKET)
{
printf("ClientS: Error at socket(): %ld\n", WSAGetLastError());
WSACleanup();
return -1;
}
else
printf("ClientS: socket() is OK!\n");
ReceiverAddr.sin_family = AF_INET;
ReceiverAddr.sin_port = htons(Port); //port number to tcp form
ReceiverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
//ReceiverAddr.sin_addr.s_addr = inet_addr("172.16.64.2");
// Send a datagram to the receiver.
printf("ClientS: Data to be sent: \"%s\"\n", SendBuf);
printf("ClientS: Sending datagrams...\n");
for(int i=0; i < 50; i++) //sending limit
{
Sleep(1000);
TotalByteSent = sendto(SendingSocket, SendBuf, BufLength, 0, (SOCKADDR *)&ReceiverAddr, sizeof(ReceiverAddr));
if(TotalByteSent) printf("ClientS: sendto() looks OK!\n");
// Some info on the receiver side...
// Allocate the required resources
memset(&SrcInfo, 0, sizeof(SrcInfo));
len = sizeof(SrcInfo);
if(getsockname(SendingSocket, (SOCKADDR *)&SrcInfo, &len) == SOCKET_ERROR)
{ printf("getsockname err"); }
//printf("ClientS: Sending IP(s) used: %s\n", inet_ntoa(SrcInfo.sin_addr));
printf("ClientS: Sending port used: %d\n", htons(SrcInfo.sin_port));
}
// Back to the system
// When your application is finished receiving datagrams close the socket.
printf("ClientS: Finished sending. Closing the sending socket...\n");
if (closesocket(SendingSocket) != 0)
printf("ClientS: closesocket() failed! Error code: %ld\n", WSAGetLastError());
else
printf("ServerS: closesocket() is OK\n");
// When your application is finished call WSACleanup.
printf("ClientS: Cleaning up...\n");
if(WSACleanup() != 0)
printf("ClientS: WSACleanup() failed! Error code: %ld\n", WSAGetLastError());
else
printf("ClientS: WSACleanup() is OK\n");
return 0;
}
|
|