Question

VC++中MFC的socket是UDP还是TCP

// ChatSocket.cpp: implementation of the CChatSocket class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ChatClient.h"
#include "ChatSocket.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CChatSocket::CChatSocket()
{
}
CChatSocket::~CChatSocket()
{
}
CChatSocket::CChatSocket(CChatClientDoc* pDoc)
{
ASSERT(pDoc != NULL);
m_pDoc = pDoc;
}
void CChatSocket::OnReceive(int nErrorCode)
{
CSocket::OnReceive(nErrorCode);
m_pDoc->ProcessPendingRead();
}
//************************************************************************************************************************8
// ChatSocket.h: interface for the CChatSocket class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_CHATSOCKET_H__A172A9D8_0219_49EE_A8BA_CFE23597C36D__INCLUDED_)
#define AFX_CHATSOCKET_H__A172A9D8_0219_49EE_A8BA_CFE23597C36D__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "chatclientDoc.h"

class CChatSocket : public CSocket
{
public:
CChatSocket(CChatClientDoc* pDoc);
CChatSocket();
virtual ~CChatSocket();

private:
CChatClientDoc* m_pDoc;
protected:
virtual void OnReceive(int nErrorCode);
};

#endif // !defined(AFX_CHATSOCKET_H__A172A9D8_0219_49EE_A8BA_CFE23597C36D__INCLUDED_)

Answer 1

可以是TCP也可以是UDP啊，看你创建socket的时候配置的参数，也就是
SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
第二个参数是SOCK_STREAM就是TCP，是SOCK_DGRAM就是UDP。

Answer 2

TCP是长连接，UDP是短连接

Answer 3

CChatSocket.cpp里看它创建socket的参数