关于socket数据接收发送的问题

[Tody Guo]

关于这个问题自己也想了很多，现在的问题就是如果我要发送的字节数量超过了send或recv的BUF的大小时，我剩下的数据怎么让它继续的传输或接收到。
希望能得到大侠的指点。
谢谢先!

[060]

将数据分成许多块, 每次send一块,

将recv放在while(1)里, 直到recv的返回值<=0

[chenfeng2002]

可以自己为要传送的一份数据打个包，发送过程拆分包，接收过程重组包。

[YFY]

发送时分包发送【可按1024字节】，接收时也是分包接收【可按1024字节】。

[chlaws]

分段发送咯

[csgdseed]

发送时有限制的

[iambic]

socket是流式的，一直发就是了。不会管你是分几次发的。

[manio]

VC的一个SOCKET发送类

// MSocket.h: interface for the MSocket class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_MSOCKET_H__173986E0_9B3F_45BC_BD5E_D2510290E3FA__INCLUDED_)
#define AFX_MSOCKET_H__173986E0_9B3F_45BC_BD5E_D2510290E3FA__INCLUDED_

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

#include <windows.h>
#include <iostream.h>
#include <winsock.h>

#define NO_FLAGS_SET 0

///////////////////////////////////////////////
//MSocket is as a TCP client 
//it connect to host to send and recv data
///////////////////////////////////////////////
class MSocket  
{
public:
	int recvData(char *mdata, int msize);
	bool disconnectFromHost();
	bool sendData(char *mdata, int msize);
	bool connectToHost();
	MSocket(char *destip, u_short destport);
	virtual ~MSocket();

private:
	char m_DestIp[32];
	u_short m_DestPort;
	WSADATA Data;
	SOCKADDR_IN destSockAddr;
	SOCKET destSocket;
	unsigned long destAddr;
	int status;
	int numsnt;

};

#endif // !defined(AFX_MSOCKET_H__173986E0_9B3F_45BC_BD5E_D2510290E3FA__INCLUDED_)

// MSocket.cpp: implementation of the MSocket class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MSocket.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

MSocket::MSocket(char *destip, u_short destport)
{
	strcpy(m_DestIp, destip);
	m_DestPort = destport;

	/* initialize the Windows Socket DLL */
	status=WSAStartup(MAKEWORD(1, 1), &Data);
	if (status != 0)
		cerr << "ERROR: WSAStartup unsuccessful"
			 << endl;

	/* convert IP address into in_addr form */
	destAddr=inet_addr(m_DestIp);
	/* copy destAddr into sockaddr_in structure */
	memcpy(&destSockAddr.sin_addr,
		   &destAddr, sizeof(destAddr));
	/* specify the port portion of the address */
	destSockAddr.sin_port=htons(m_DestPort);
	/* specify the address family as Internet */
	destSockAddr.sin_family=AF_INET;


}

MSocket::~MSocket()
{

}

bool MSocket::connectToHost()
{
	/*掉线后要重新获取SOCKET，才能重连上，一次连接一个SOCKET*/
	/* create a socket */
	destSocket=socket(AF_INET, SOCK_STREAM, 0);
	if (destSocket == INVALID_SOCKET)
	{
		cerr << "ERROR: socket unsuccessful" << endl;
		status=WSACleanup();
		if (status == SOCKET_ERROR)
		  cerr << "ERROR: WSACleanup unsuccessful" 
			   << endl;
		return false;
	}
	cout<<"MSocket initialized sucessfully!"<<endl;
	cout << "Trying to connect to IP Address: "
	   << m_DestIp << endl;

	/* connect to the server */
	status=connect(destSocket, (LPSOCKADDR) &destSockAddr, sizeof(destSockAddr));
	if (status == SOCKET_ERROR)
	{
		cerr << "ERROR: connect unsuccessful" << endl;
		status=closesocket(destSocket);
		if (status == SOCKET_ERROR)
		  cerr << "ERROR: closesocket unsuccessful"
			<< endl;
		return false ;
	}
	cout << "Connected..." << endl;
	return true;
}

bool MSocket::sendData(char *mdata, int msize)
{
    cout << "Sending..." << endl;
    numsnt=send(destSocket, mdata, msize, NO_FLAGS_SET);
    if (numsnt != msize)
    {
      cout << "Connection terminated" << endl;
      status=closesocket(destSocket);
      if (status == SOCKET_ERROR)
        cerr << "ERROR: closesocket unsuccessful"
          << endl;
      return false;
    }
	return true;
}

bool MSocket::disconnectFromHost()
{
    status=closesocket(destSocket);
    if (status == SOCKET_ERROR) {
      cerr << "ERROR: closesocket unsuccessful"
        << endl;
	}
    status=WSACleanup();
    if (status == SOCKET_ERROR) {
      cerr << "ERROR: WSACleanup unsuccessful"
        << endl;
	  return false;
	}
	return true;
}

int MSocket::recvData(char *mdata, int msize)
{
	status = recv(destSocket, mdata, msize, NO_FLAGS_SET);
	if (status == SOCKET_ERROR) {
		cerr << "ERROR: recv() unsuccessful" << endl;
	}
	return status;
}