Vsual studio 2013 environment UDP multicast

---

Preface `

MFC(Microsoft Foundation Classes) Is the abbreviation of Microsoft basic class library , It's a Microsoft implementation of c++ Class library , It mainly encapsulates most of the windows API function ,vc++ It was developed by Microsoft c/c++ Integrated development environment , The so-called integrated development environment , That is to say, it can be used to edit , compile , debugging , Instead of using multiple tools to rotate operations , More flexibility .vc It also refers to its internal compiler , The IDE must have a compiler kernel , for example DevC++ One of the compiler cores is gcc. MFC In addition to being a class library , It's still a framework , stay vc++ I'll build a new one MFC The engineering of , The development environment will automatically generate many files for you , And it uses mfcxx.dll.xx It's the version , It encapsulates the mfc kernel , So you can't see the original in your code SDK Message loops in programming and so on , because MFC The frame is packaged for you , So you can focus on the logic of your program , Instead of these things that are repeated every time you program , But because it's a common framework , There is no best targeting , Of course, some flexibility and efficiency are lost . however MFC The package is very shallow , So the loss of efficiency is small .

---

Two 、 Code block

1. Group broadcast sender

The code is as follows （ Example ）：

#include <stdio.h> 
#include <winsock2.h> 
#include <ws2tcpip.h> 
#pragma comment(lib, "ws2_32.lib")
 
int main()
{
    
	int iRet = 0;
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
 
	SOCKET sock = socket(AF_INET,SOCK_DGRAM,0);


	sockaddr_in addr;
	addr.sin_addr.S_un.S_addr = inet_addr("224.2.2.2");
	addr.sin_family = AF_INET;
	addr.sin_port = htons(55555);
	
	char strSend[1024] = {
    0};
	static int iIdx = 0;
	while(1)  
	{
         
		sprintf_s(strSend, "udp send group data:%d", iIdx++);
		iRet = sendto(sock, strSend, strlen(strSend) + 1, 0, (sockaddr*)&addr, sizeof(sockaddr));
		if(iRet <= 0){
    
			printf("send fail:%d", WSAGetLastError());
		}else{
    
			printf("send data:%s\n", strSend);
		}
		Sleep(500); 
	}  
 
	closesocket(sock);
	WSACleanup();
 
	return 0;
}

2. Multicast receiver

The code is as follows （ Example ）：

#include <stdio.h> 
#include <winsock2.h> 
#include <ws2tcpip.h> 
#pragma comment(lib, "ws2_32.lib")

int main()
{
    
	int iRet = 0;
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);

	sockaddr_in add, addr;
	addr.sin_family = AF_INET;
	//addr.sin_addr.S_un.S_addr = INADDR_ANY;
	addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	addr.sin_port = htons(55555);

	bool bOptval = true;
	iRet = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&bOptval, sizeof(bOptval));
	if (iRet != 0){
    
		printf("setsockopt fail:%d", WSAGetLastError());
		return -1;
	}

	iRet = bind(sock, (sockaddr*)&addr, sizeof(addr));
	if (iRet != 0){
    
		printf("bind fail:%d", WSAGetLastError());
		return -1;
	}
	printf("socket:%d bind success\n", sock);

	//  Join multicast  
	ip_mreq multiCast;
	//multiCast.imr_interface.S_un.S_addr = INADDR_ANY;
	multiCast.imr_interface.S_un.S_addr = inet_addr("127.0.0.1");
	multiCast.imr_multiaddr.S_un.S_addr = inet_addr("224.2.2.2");
	iRet = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&multiCast, sizeof(multiCast));
	if (iRet != 0){
    
		printf("setsockopt fail:%d", WSAGetLastError());
		return -1;
	}
	printf("udp group start\n");

	int len = sizeof(sockaddr);
	char strRecv[1024] = {
     0 };
	while (true)
	{
    
		memset(strRecv, 0, sizeof(strRecv));
		iRet = recvfrom(sock, strRecv, sizeof(strRecv)-1, 0, (sockaddr*)&add, &len);
		if (iRet <= 0){
    
			printf("recvfrom fail:%d", WSAGetLastError());
			return -1;
		}
		printf("recv data:%s\n", strRecv);
	}

	closesocket(sock);
	WSACleanup();

	return 0;
}

---

summary

• Benchmarking reference Ubuntu Under the udp Multicast

pure C The code to compile