UDP发送端指定端口

[xs19880126]

如题,请问UDP发送端如何指定端口,我用Bind但是返回-1;还有想绑定指定源端口还可以怎么做; 源码如下
SOCKET_HANDLE hSocket;
SOCKADDR_IN addrRecv;
if (0 == (hSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)))
{
Log("创建UDP Socket句柄失败！");
return FALSE;
}
addrRecv.sin_family = AF_INET;
addrRecv.sin_port = htons(nPort);
addrRecv.sin_addr.S_un.S_addr = htonl(lpszIP);



SOCKADDR_IN addrMe;
addrMe.sin_family = AF_INET;
int portu = 8012;
addrMe.sin_port = ntohs(portu);
addrMe.sin_addr.S_un.S_addr = htonl(0);
int ibin;

ibin = bind(hSocket, (sockaddr*)&addrMe, sizeof(addrMe));
//ibin = WSAGetLastError();



int nSended = sendto(hSocket, pData, nLen, 0, (sockaddr*) &addrRecv, (int)sizeof(addrRecv));

分不多,新手谢谢大家了!!!

[dleijl]

(0 == (hSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)))
中这一句hSocket初始化为0了吗?你用CSocket::Create创建试试

[leetow2003]

你先用WSAGetLastError()获得
错误信息，再查查是什么原因

[xs19880126]

用WSAGetLastError查是 1006

[mayudong1]

SOCKADDR_IN addrMe;
addrMe.sin_family = AF_INET;
int portu = 8012;
addrMe.sin_port = ntohs(portu);
addrMe.sin_addr.S_un.S_addr = htonl(0);

[Eleven]

[Quote=引用 3 楼 xs19880126 的回复:]
用WSAGetLastError查是 1006
[/Quote]
1006: 文件所在的卷已被外部改变，因此打开的文件不再有效。
???

[gameslq]

代码

#include <winsock.h>
#include <stdio.h>

#pragma comment (lib,"ws2_32")

//端口
const int nPort = 1024;
//发送地址
const char *lpszIP = "127.0.0.1";


int main(void)
{
	SOCKET  hSocket = 0;
	SOCKADDR_IN addrRecv;
	WSADATA wsdata;

	do
	{
		memset(&wsdata,0,sizeof(WSADATA));
		//初始化库
		if ( WSAStartup(2<<8|2,&wsdata) != 0 )
		{
			printf("initiation socket failed\n");
			return -1;
		}


		if (0 == (hSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)))
		{
			printf("创建UDP Socket句柄失败！");
			return -2;
		}

		addrRecv.sin_family = AF_INET;
		addrRecv.sin_port = htons(nPort);
		addrRecv.sin_addr.S_un.S_addr = inet_addr(lpszIP);
		
		
		//绑定地址
		SOCKADDR_IN addrMe;  
		addrMe.sin_family = AF_INET;  
		int portu = 8012;
		addrMe.sin_port = htons(portu);
		addrMe.sin_addr.S_un.S_addr = htonl(0);   
		int ibin;
		
		if ( (ibin = bind(hSocket, (sockaddr*)&addrMe, sizeof(addrMe))) == SOCKET_ERROR )
		{
			printf("bind error,code:%d\n",WSAGetLastError());
			break;
		}
		
		
		
		int nSended = sendto(hSocket, pData, nLen, 0, (sockaddr*) &addrRecv, (int)sizeof(addrRecv));
	}while (0 );

	if ( hSocket != 0 )
		closesocket(hSocket);
	WSACleanup();

	return 0;
}

用WSAGetLastError查是 1006
错误码不正确。

[leetow2003]

奇怪，我运行代码没有出现错误