windows下的udp通信

[LitteGreen]

如何在udp通信中设置发送和接收的端口。

[Trinx]

不清楚，刚学C
先帮忙顶贴了！

[「已注销」]

接受 用bind函数

发送直接在sendto函数中指明

[duke56]

int sendto(
  SOCKET s,                        
  const char FAR *buf,            
  int len,                         
  int flags,                       
  const struct sockaddr FAR *to,//你要发送的地址上包含端口的参数,接收也差不多
  int tolen                        
);

[LitteGreen]

#include<windows.h>
#include<iostream.h>
class UDPNet
{
private:
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
	//int Port;
	SOCKADDR_IN addSrv;
	SOCKADDR_IN addrClient;
	SOCKET sockSrv;
	int len;
public:
	void Open()
	{
		wVersionRequested = MAKEWORD( 1, 1 );
		
		err = WSAStartup( wVersionRequested, &wsaData );
		if ( err != 0 ) {
			MessageBox(NULL,"网络协议加载失败","",0); 
		}
		
		if ( LOBYTE( wsaData.wVersion ) != 1 ||
			HIBYTE( wsaData.wVersion ) != 1 ) {
			WSACleanup( );
			MessageBox(NULL,"网络协议加载失败","",0); 
		}
		
		
		sockSrv=socket(AF_INET,SOCK_DGRAM,0);
			
		len=sizeof(SOCKADDR);
		
		bind(sockSrv,(SOCKADDR*)&addSrv,sizeof(SOCKADDR));

	};
	void Send(TCHAR Buffer[200], int port)
	{
		long laddr =::inet_addr("192.168.1.199");
		addrClient.sin_addr.s_addr=laddr;
		addrClient.sin_family=AF_INET;
		addrClient.sin_port=htons(port);
		
		sendto(sockSrv,Buffer,strlen(Buffer)+1,0,(SOCKADDR*)&addrClient,
			sizeof(SOCKADDR));
	};
	void Recv(TCHAR Recv[200], int port)
	{
		//long laddr =::inet_addr("192.168.1.199");
		long laddr =::inet_addr("192.168.1.199");
		addrClient.sin_addr.s_addr=laddr;
		addrClient.sin_family=AF_INET;
		addrClient.sin_port=htons(port);
		recvfrom(sockSrv,Recv,100,0,(SOCKADDR*)&addrClient,&len);
	};
	void Close();
};
void main()
{
	
	UDPNet udpnet;
//	udpnet.SetPort(5001);
	udpnet.Open();
	while(1)
	{
		udpnet.Send("中国人民",6000);
		TCHAR RecvData[200];
		udpnet.Recv(RecvData,6000);
	    cout<<RecvData<<endl;
	}

}能帮我看看吗，我怎么收不到数据呀

[duke56]

    void Recv(TCHAR Recv[200], int port)
    {
        ...
        addrClient.sin_addr.s_addr = INADDR_ANY;
        ...
    };//试试

[wjb_yd]

客户端填好服务器的地址和端口，直接sendto。
服务器填好自己接受数据的端口，先bind，然后recvfrom即可。