远程控制编程

开发平台：
Visual C++

Blocksock.cpp：源码内容
							// blocksock.cpp (CBlockingSocketException, CBlockingSocket, CHttpBlockingSocket)
#include <stdafx.h>
#include "blocksock.h"
// Class CBlockingSocketException
IMPLEMENT_DYNAMIC(CBlockingSocketException, CException)
CBlockingSocketException::CBlockingSocketException(char* pchMessage)
{
	m_strMessage = pchMessage;
	m_nError = WSAGetLastError();
}
BOOL CBlockingSocketException::GetErrorMessage(LPTSTR lpstrError, UINT nMaxError,
		PUINT pnHelpContext /*= NULL*/)
{
	char text[200];
	if(m_nError == 0) {
		wsprintf(text, "%s error", (const char*) m_strMessage);
	}
	else {
		wsprintf(text, "%s error #%d", (const char*) m_strMessage, m_nError);
	}
	strncpy(lpstrError, text, nMaxError - 1);
	return TRUE;
}
// Class CBlockingSocket
IMPLEMENT_DYNAMIC(CBlockingSocket, CObject)
void CBlockingSocket::Cleanup()
{
	// doesn't throw an exception because it's called in a catch block
	if(m_hSocket == NULL) return;
	VERIFY(closesocket(m_hSocket) != SOCKET_ERROR);
	m_hSocket = NULL;
}
void CBlockingSocket::Create(int nType /* = SOCK_STREAM */)
{
	ASSERT(m_hSocket == NULL);
	if((m_hSocket = socket(AF_INET, nType, 0)) == INVALID_SOCKET) {
		throw new CBlockingSocketException("Create");
	}
}
void CBlockingSocket::Bind(LPCSOCKADDR psa)
{
	ASSERT(m_hSocket != NULL);
	if(bind(m_hSocket, psa, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		throw new CBlockingSocketException("Bind");
	}
}
void CBlockingSocket::Listen()
{
	ASSERT(m_hSocket != NULL);
	if(listen(m_hSocket, 5) == SOCKET_ERROR) {
		throw new CBlockingSocketException("Listen");
	}
}
BOOL CBlockingSocket::Accept(CBlockingSocket& sConnect, LPSOCKADDR psa)
{
	ASSERT(m_hSocket != NULL);
	ASSERT(sConnect.m_hSocket == NULL);
	int nLengthAddr = sizeof(SOCKADDR);
	sConnect.m_hSocket = accept(m_hSocket, psa, &nLengthAddr);
	if(sConnect == INVALID_SOCKET) {
		// no exception if the listen was canceled
		if(WSAGetLastError() != WSAEINTR) {
			throw new CBlockingSocketException("Accept");
		}
		return FALSE;
	}
	return TRUE;
}
void CBlockingSocket::Close()
{
	ASSERT(m_hSocket != NULL);
	if(closesocket(m_hSocket) == SOCKET_ERROR) {
		// should be OK to close if closed already
		throw new CBlockingSocketException("Close");
	}
	m_hSocket = NULL;
}
void CBlockingSocket::Connect(LPCSOCKADDR psa)
{
	ASSERT(m_hSocket != NULL);
	// should timeout by itself
	if(connect(m_hSocket, psa, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		throw new CBlockingSocketException("Connect");
	}
}
int CBlockingSocket::Write(const char* pch, const int nSize, const int nSecs)
{
	int nBytesSent = 0;
	int nBytesThisTime;
	const char* pch1 = pch;
	do {
		nBytesThisTime = Send(pch1, nSize - nBytesSent, nSecs);
		nBytesSent += nBytesThisTime;
		pch1 += nBytesThisTime;
	} while(nBytesSent < nSize);
	return nBytesSent;
}
int CBlockingSocket::Send(const char* pch, const int nSize, const int nSecs)
{
	ASSERT(m_hSocket != NULL);
	// returned value will be less than nSize if client cancels the reading
	FD_SET fd = {1, m_hSocket};
	TIMEVAL tv = {nSecs, 0};
	if(select(0, NULL, &fd, NULL, &tv) == 0) {
		throw new CBlockingSocketException("Send timeout");
	}
	int nBytesSent;
	if((nBytesSent = send(m_hSocket, pch, nSize, 0)) == SOCKET_ERROR) {
		throw new CBlockingSocketException("Send");
	}
	return nBytesSent;
}
int CBlockingSocket::Receive(char* pch, const int nSize, const int nSecs)
{
	ASSERT(m_hSocket != NULL);
	FD_SET fd = {1, m_hSocket};
	TIMEVAL tv = {nSecs, 0};
	if(select(0, &fd, NULL, NULL, &tv) == 0) {
		throw new CBlockingSocketException("Receive timeout");
	}
	int nBytesReceived;
	if((nBytesReceived = recv(m_hSocket, pch, nSize, 0)) == SOCKET_ERROR) {
		throw new CBlockingSocketException("Receive");
	}
	return nBytesReceived;
}
int CBlockingSocket::ReceiveDatagram(char* pch, const int nSize, LPSOCKADDR psa, const int nSecs)
{
	ASSERT(m_hSocket != NULL);
	FD_SET fd = {1, m_hSocket};
	TIMEVAL tv = {nSecs, 0};
	if(select(0, &fd, NULL, NULL, &tv) == 0) {
		throw new CBlockingSocketException("Receive timeout");
	}
	// input buffer should be big enough for the entire datagram
	int nFromSize = sizeof(SOCKADDR);
	int nBytesReceived = recvfrom(m_hSocket, pch, nSize, 0, psa, &nFromSize);
	if(nBytesReceived == SOCKET_ERROR) {
		throw new CBlockingSocketException("ReceiveDatagram");
	}
	return nBytesReceived;
}
int CBlockingSocket::SendDatagram(const char* pch, const int nSize, LPCSOCKADDR psa, const int nSecs)
{
	ASSERT(m_hSocket != NULL);
	FD_SET fd = {1, m_hSocket};
	TIMEVAL tv = {nSecs, 0};
	if(select(0, NULL, &fd, NULL, &tv) == 0) {
		throw new CBlockingSocketException("Send timeout");
	}
	int nBytesSent = sendto(m_hSocket, pch, nSize, 0, psa, sizeof(SOCKADDR));
	if(nBytesSent == SOCKET_ERROR) {
		throw new CBlockingSocketException("SendDatagram");
	}
	return nBytesSent;
}
void CBlockingSocket::GetPeerAddr(LPSOCKADDR psa)
{
	ASSERT(m_hSocket != NULL);
	// gets the address of the socket at the other end
	int nLengthAddr = sizeof(SOCKADDR);
	if(getpeername(m_hSocket, psa, &nLengthAddr) == SOCKET_ERROR) {
		throw new CBlockingSocketException("GetPeerName");
	}
}
void CBlockingSocket::GetSockAddr(LPSOCKADDR psa)
{
	ASSERT(m_hSocket != NULL);
	// gets the address of the socket at this end
	int nLengthAddr = sizeof(SOCKADDR);
	if(getsockname(m_hSocket, psa, &nLengthAddr) == SOCKET_ERROR) {
		throw new CBlockingSocketException("GetSockName");
	}
}
//static
CSockAddr CBlockingSocket::GetHostByName(const char* pchName, const USHORT ushPort /* = 0 */)
{
	hostent* pHostEnt = gethostbyname(pchName);
	if(pHostEnt == NULL) {
		throw new CBlockingSocketException("GetHostByName");
	}
	ULONG* pulAddr = (ULONG*) pHostEnt->h_addr_list[0];
	SOCKADDR_IN sockTemp;
	sockTemp.sin_family = AF_INET;
	sockTemp.sin_port = htons(ushPort);
	sockTemp.sin_addr.s_addr = *pulAddr; // address is already in network byte order
	return sockTemp;
}
//static
const char* CBlockingSocket::GetHostByAddr(LPCSOCKADDR psa)
{
	hostent* pHostEnt = gethostbyaddr((char*) &((LPSOCKADDR_IN) psa)
				->sin_addr.s_addr, 4, PF_INET);
	if(pHostEnt == NULL) {
		throw new CBlockingSocketException("GetHostByAddr");
	}
	return pHostEnt->h_name; // caller shouldn't delete this memory
}

						