VC-socket套接字，bind绑定发送端口失败！！求救！！

Question

#include "winsock.h"

class CSocketOperator  
{
public:
    CSocketOperator();
    virtual ~CSocketOperator();
    BOOL InitLocal(CString localIP,const UINT localPort);
    BOOL InitTarget(CString targetIP,const UINT targetPort);
    BOOL CloseLocal();
    BOOL CloseTarget();
    BOOL CloseAllSocket();
    BOOL IsTarget();
    BOOL IsLocal();
    void GetString(TCHAR *&b,int &ret,CString &ip,int &port);
    void SendString(TCHAR *a,int len_a);
    void ReSend();
    TCHAR *GetCurrentSend();
private:
    SOCKET m_localSock,m_targetSock;
    sockaddr_in m_localAddr,m_targetAddr,m_sourceAddr,m_from;   
    int len_addr,m_nLen;
    TCHAR getBuffer[65],*m_pcCurrentSend;
};

CSocketOperator::CSocketOperator()
{
    WSADATA wsaData;
    WORD version=MAKEWORD(2,0);
    if(WSAStartup(version,&wsaData)!=0)
    {
        AfxMessageBox(_T("winsocket启动失败！"));
    }
    m_localSock=NULL;
    m_targetSock=NULL;

    len_addr=sizeof(sockaddr_in);
}

BOOL CSocketOperator::InitTarget(CString targetIP,const UINT targetPort)
{
    if(m_targetSock!=NULL)
    {
        closesocket(m_targetSock);
        m_targetSock=NULL;
    }
    m_targetSock=socket(AF_INET,SOCK_DGRAM,0);  
    //目标地址
    m_targetAddr.sin_family=AF_INET;
    m_targetAddr.sin_addr.S_un.S_addr=inet_addr(targetIP.GetBuffer(0));
    m_targetAddr.sin_port=htons(targetPort);

    for(int i=0;i<5;i++)
    {
        if(bind(m_targetSock,(PSOCKADDR)&m_sourceAddr,len_addr)!=SOCKET_ERROR)
            return TRUE;
        Sleep(100);
    }
    AfxMessageBox(_T("发送端口绑定失败!"));
    closesocket(m_targetSock);
    m_targetSock=NULL;
    return FALSE;

}

BOOL CSocketOperator::InitLocal(CString localIP,const UINT localPort)
{
    if(m_localSock!=NULL)
    {
        closesocket(m_localSock);
        m_localSock=NULL;
    }
    m_localSock=socket(AF_INET,SOCK_DGRAM,0);
        
    //本机地址
    m_localAddr.sin_family=AF_INET;
    m_localAddr.sin_addr.S_un.S_addr=inet_addr(localIP.GetBuffer(0));
    m_localAddr.sin_port=htons(localPort);
    
    //源地址
    m_sourceAddr.sin_family=AF_INET;
    m_sourceAddr.sin_addr.S_un.S_addr=inet_addr(localIP.GetBuffer(0));
    m_sourceAddr.sin_port=htons(localPort);
    //绑定套接字
    for(int i=0;i<5;i++)
    {
        if(bind(m_localSock,(PSOCKADDR)&m_localAddr,len_addr)!=SOCKET_ERROR)
            return TRUE;
        Sleep(100);
    }
    AfxMessageBox(_T("监视端口绑定失败!"));
    closesocket(m_localSock);
    m_localSock=NULL;
    return FALSE;
}

Answer 1

windows下的我不熟悉，如果跟linux下的概念没啥差别的话，bind应该是绑定本地的出口地址，看的你的变量命名，似乎是想绑定接收端的地址。窃以为，你想做的应该是connect而不是bind

Answer 2

找到原因了，原来是端口复用的原因。将套接字设置成SO_REUSEADDR属性就好了。

但是现在出现了一个新的问题，之前我并没有设置成SO_REUSEADDR属性，但是一样可以正常运行！