-1
的Visual Studio 2017年社區C++插座 - SENDTO - 沒有數據收到
C++ CLR項目
它應該可以發送一個UDP數據報多播地址。
我發送沒有錯誤。
--------------
MULTICAST
-------------------
'Project2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\mswsock.dll'. Symbols loaded.
MULTICAST ----
IP:224.0.0.2
PORT:7125
-------------
Sent: 13
Sent: 13
Sent: 13
接收端收到這個輸入
{"socketId":0,"data":{},"remoteAddress":"192.168.0.80","remotePort":2535}
下面是代碼
const char *msg = "1 2 3 4 5 6 7";
while (sending) {
//swprintf(str, L"\nMSG: \n%c ", channels);
//OutputDebugString(str);
// Send a message to the multicasting address.
int ret = sendto(Sock, msg, strlen(msg), 0, (struct sockaddr FAR *) &dest_sin, sizeof(dest_sin));
swprintf(str, L"\nSent: %d \n\n", ret);
OutputDebugString(str);
if (ret == SOCKET_ERROR)
{
swprintf(str, L"\nsendto failed! Error: %d ", WSAGetLastError());
OutputDebugString(str);
closesocket(Sock);
sending = false;
}
Sleep(66);
}
全部插座碼的發送部分，如果有幫助
// Sent message string
TCHAR szError[100]; // Error message string
SOCKET Sock = INVALID_SOCKET; // Datagram window socket
SOCKADDR_IN source_sin, // Source socket address
dest_sin; // Destination socket address
WSADATA WSAData; // Contains details of the
// Winsock implementation
OutputDebugString(L"\n--------------\nMULTICAST\n-------------------\n");
// Initialize Winsock.
if (WSAStartup(MAKEWORD(1, 1), &WSAData) != 0)
{
swprintf(str, TEXT("WSAStartup failed! Error: %d"), WSAGetLastError());
OutputDebugString(str);
return FALSE;
}
// Create a datagram window socket, Sock.
if ((Sock = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
{
swprintf(str, TEXT("Allocating socket failed! Error: %d"), WSAGetLastError());
OutputDebugString(str);
return FALSE;
}
// Fill out source socket's address information.
source_sin.sin_family = AF_INET;
source_sin.sin_port = htons(SOURCE_PORT);
source_sin.sin_addr.s_addr = htonl(INADDR_ANY);
// Associate the source socket's address with the socket, Sock.
if (bind(Sock,
(struct sockaddr FAR *) &source_sin,
sizeof(source_sin)) == SOCKET_ERROR)
{
swprintf(str, TEXT("Binding socket failed! Error: %d"), WSAGetLastError());
OutputDebugString(str);
closesocket(Sock);
return FALSE;
}
// Set the Time-to-Live of the multicast.
int set_sock = setsockopt(Sock, SOL_SOCKET, SO_BROADCAST, (char FAR *)&iOptVal, sizeof(int));
if (set_sock == SOCKET_ERROR)
{
swprintf(str, TEXT("\n`setsockopt` failed! Error: %d\n\n"), WSAGetLastError());
OutputDebugString(str);
closesocket(Sock);
return FALSE;
}
// Fill out the desination socket's address information.
dest_sin.sin_family = AF_INET;
dest_sin.sin_port = ntohs(mcast_port);
dest_sin.sin_addr.s_addr = inet_addr(mcast_ip);
swprintf(str, L"\nMULTICAST ----\nIP:%s\nPORT:%d\n-------------\n", mcast_ip, mcast_port);
OutputDebugString(str);
const char *msg = "1 2 3 4 5 6 7";
while (sending) {
//swprintf(str, L"\nMSG: \n%c ", channels);
//OutputDebugString(str);
// Send a message to the multicasting address.
int ret = sendto(Sock, msg, strlen(msg), 0, (struct sockaddr FAR *) &dest_sin, sizeof(dest_sin));
swprintf(str, L"\nSent: %d \n\n", ret);
OutputDebugString(str);
if (ret == SOCKET_ERROR)
{
swprintf(str, L"\nsendto failed! Error: %d ", WSAGetLastError());
OutputDebugString(str);
closesocket(Sock);
sending = false;
}
Sleep(66);
}
OutputDebugString(L"\n---------------------\nMULTICAST DONE\n---------------------\n");
if (!sending) {
// Disable sending on Sock before closing it.
shutdown(Sock, 0x01);
// Close Sock.
closesocket(Sock);
WSACleanup();
}
從我已閱讀。
const char * msg
應該是正確的？
任何建議表示讚賞。
編輯：
作爲每Remy Lebeau
INT set_sock = setsockopt的（襪子，IPPROTO_IP，IP_ADD_MEMBERSHIP，（CHAR FAR *）& iOptVal，的sizeof（INT））;
Error: 10042 -- An unknown, invalid or unsupported option or level was specified in a getsockopt or setsockopt call.
接收。您不必加入該組即可發送給它。 – EJP
爲什麼選擇投票？這是一個問題....如果我知道答案，我不會在這裏。 –
'IP_ADD_MEMBERSHIP'將一個指向['ip_mreq']（https://msdn.microsoft.com/en-us/library/windows/desktop/ms738695.aspx）struct的指針作爲輸入，而不是'int'。閱讀文檔：[IPPROTO_IP套接字選項]（https://msdn.microsoft.com/en-us/library/windows/desktop/ms738586.aspx） –