是这样的我按照,EVC高级编程及其应用开发一书第十章的UDP程序,编译完了以后,我在网上下载了一个UDP调试工具(windows下的),然后,用EVC编写的UDPDemo给那个调试工具发送数据,可以接收到,但是UDP调试工具给EVC程序发送消息就收不到。同时用两个EVC程序对发,也是接收不到,不知道为什么。下面是源代码。(有点长)
// UDP_CE.cpp: implementation of the CUDP_CE class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "UDP_CE.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CUDP_CE::CUDP_CE()
{
}
CUDP_CE::~CUDP_CE()
{
}
/*
*函数介绍:打开UDP通讯端口
*入口参数:pWnd: 指定父窗体指针
localPort: 指定远程UDP端口
romoteHost:指定远程IP地址
remotePort:指定远程UDP端口
*出口参数:(无)
*返回值:1代表成功;-1,-2,-3等都代表失败
*/
DWORD CUDP_CE::Open(CWnd* pWnd,int localPort,LPCTSTR remoteHost,int remotePort)
{
WSADATA wsa;
m_pOwnerWnd = pWnd;
//加载winsock动态链接库
if (WSAStartup(MAKEWORD(1,1),&wsa) != 0)
{
return -1;//代表失败
}
//创建UDP套接字
m_UDPSocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
if (m_UDPSocket == INVALID_SOCKET)
{
return -2;
}
SOCKADDR_IN localAddr;
localAddr.sin_family = AF_INET;
localAddr.sin_port = htons(localPort);
localAddr.sin_addr.s_addr=INADDR_ANY;
//绑定地址
if(bind(m_UDPSocket,(sockaddr*)&localAddr,sizeof(localAddr))!=0)
{
return -3;
}
//设置非堵塞通讯
DWORD ul= 1;
ioctlsocket(m_UDPSocket,FIONBIO,&ul);
//创建一个线程退出事件
m_ExitThreadEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
//创建通讯线程
AfxBeginThread(RecvThread,this);
m_RemoteAddr.sin_family = AF_INET;
m_RemoteAddr.sin_port = htons(remotePort);
//此处要将双字节转换成单字节
char ansiRemoteHost[255];
ZeroMemory(ansiRemoteHost,255);
WideCharToMultiByte(CP_ACP,WC_COMPOSITECHECK,remoteHost,wcslen(remoteHost)
,ansiRemoteHost,wcslen(remoteHost),NULL,NULL);
m_RemoteAddr.sin_addr.s_addr=inet_addr(ansiRemoteHost);
return 1;
}
/*
*函数介绍:关闭UDP通讯端口
*入口参数:(无)
*出口参数:(无)
*返 回 值:1代表成功;-1,-2等都代表失败
*/
DWORD CUDP_CE::Close(void)
{
//设置通讯线程退出事件,通知线程退出
SetEvent(m_ExitThreadEvent);
Sleep(2000);
//关闭线程句柄
CloseHandle(m_ExitThreadEvent);
//关闭socket
if (closesocket(m_UDPSocket) == SOCKET_ERROR)
{
return -1;
}
//释放socket资源
if (WSACleanup() == SOCKET_ERROR)
{
return -2;
}
return 1;
}
/*
*这里是张国威自己修改过的,编译成功,100%可以运行!!!!
*函数介绍:发送数据
*入口参数:dataPriority: 数据优先级
dataType: 数据类型
buf:缓冲区数据
len:缓冲数据长度
*出口参数:(无)
*返回值:发送成功代表实际发送的字节数,否则返回-1
*/
bool CUDP_CE::SendData(const char *buf, int len)
{
int nBytes = 0;
int nErrorCode;
nBytes = sendto(m_UDPSocket,buf,len,0,(sockaddr*)&m_RemoteAddr,sizeof(m_RemoteAddr));
if (nBytes==SOCKET_ERROR )
{
nErrorCode = WSAGetLastError();
m_OnUdpError(m_pOwnerWnd,nErrorCode);
return false;
}
return true;
}
/*
*函数介绍:接收线程函数
*入口参数:lparam : 指传进线程的参数
*出口参数:(无)
*返 回 值:无意义。
*/
UINT CUDP_CE::RecvThread(LPVOID lparam)
{
CUDP_CE *pSocket;
pSocket = (CUDP_CE*)lparam;
fd_set fdRead;
int ret;
TIMEVAL aTime;
char * recvBuf=NULL;
aTime.tv_sec = 1;
aTime.tv_usec = 0;
SOCKADDR_IN tmpAddr;
int tmpRecvLen;
int recvLen;
int iErrorCode;
char * recvedBuf = NULL;
int recvedBufLen;
while (TRUE)
{
//收到退出事件,结束线程
if (WaitForSingleObject(pSocket->m_ExitThreadEvent,0) == WAIT_OBJECT_0)
{
break;
}
//将set初始化空集合
FD_ZERO(&fdRead);
//将pSocket->m_UDPSocket套接字添加到集合中
FD_SET(pSocket->m_UDPSocket,&fdRead);
//调用select函数,判断套接字I/O状态
ret = select(0,&fdRead,NULL,NULL,&aTime);
if (ret == SOCKET_ERROR)
{
iErrorCode = WSAGetLastError();
pSocket->m_OnUdpError(pSocket->m_pOwnerWnd,iErrorCode);
break;
}
if (ret > 0)
{
if (FD_ISSET(pSocket->m_UDPSocket,&fdRead))
{
tmpAddr.sin_family=AF_INET;
tmpAddr.sin_port = htons(pSocket->m_RemoteAddr.sin_port);
tmpAddr.sin_addr.s_addr =INADDR_ANY;
tmpRecvLen = sizeof(tmpAddr);
recvBuf = new char[1024];
recvedBuf = new char[1024];
ZeroMemory(recvBuf,1024);
ZeroMemory(recvedBuf,1024);
recvLen = recvfrom(pSocket->m_UDPSocket,recvBuf, 1024,0,(SOCKADDR*)&tmpAddr,&tmpRecvLen);
if (recvLen == SOCKET_ERROR)
{
iErrorCode = WSAGetLastError();
pSocket->m_OnUdpError(pSocket->m_pOwnerWnd,iErrorCode);
break;
}
else if (recvLen == 0)
{
iErrorCode = WSAGetLastError();
pSocket->m_OnUdpError(pSocket->m_pOwnerWnd,iErrorCode);
break;
}
else
{
//此处添加解析程序,将接收到的数据解析后,
pSocket->m_OnUdpRecv(pSocket->m_pOwnerWnd,recvBuf,recvedBufLen,(SOCKADDR*)&tmpAddr);
delete []recvBuf;
recvBuf = NULL;
delete []recvedBuf;
recvedBuf = NULL;
}
}
}
}
return 0;
}
/*
*函数介绍:处理接收到的数据包
*入口参数:inBuf: 待处理的缓冲区
inBufLen:待处理的缓冲区长度
*出口参数:dataPriority:数据优先级
dataType:数据类型
outBuf:处理后的缓冲区数据
outBufLen:处理后的缓冲区数据长度
*返 回 值:合法则返回true,否则,返回false;
*/
bool CUDP_CE::HandlePackage(const char *inBuf,int inBufLen
,char *outBuf,int &outBufLen)
{
CString csBuf;
csBuf = inBuf;
int iPosHead = pos(FRAMEHEAD,inBuf,inBufLen);
int iPosTail = pos(FRAMETAIL,inBuf,inBufLen);
//没有查到包头或包尾
if ((iPosHead == -1) || (iPosTail == -1))
{
return FALSE;
}
//如果包头位置大于等于包尾位置,就退出
if (iPosHead >= iPosTail)
{
return FALSE;
}
//得到数据包长度
int iPackLen;
CopyMemory(&iPackLen,inBuf+iPosHead+4,4);
//判断包长度是否正确
if (iPackLen != iPosTail - iPosHead - 8)
{
return FALSE;
}
CopyMemory(outBuf,inBuf+8,iPackLen);
outBufLen = iPackLen;
return TRUE;
}
/*
*函数介绍:查找一个字符串的位置
*入口参数:aSubStr: 待查找的子串
aBuf:待查找的缓冲区
len:待查找的缓冲区长度
*出口参数:(无)
*返回值:找到的话,返回在父串中的位置,否则返回-1.
*/
int CUDP_CE::pos(LPCSTR aSubStr, const char *aBuf, int len)
{
bool aResult = TRUE;
int subLen = strlen(aSubStr);
for ( int i=0;i
{
aResult = TRUE;
for (int j=0;j
{
if (*(aBuf+i+j) != aSubStr[j])
{
aResult = FALSE;
break;
}
int k = 0;
}
if (aResult)
{
return i;
}
}
return -1;
}