break;
case UDP:
nLen=recvfrom(m_Socket,buf,4096,0,(struct sockaddr*)&from,&nLength);
if(nLen>0){
buf[nLen]='\0';
TxtEdit->Text="Received Length:"+String(nLen)+"\r\n"+StrPas(buf);
}
break;
}
break;
case FD_CLOSE:
closesocket(m_Socket);
break;
}
}
void __fastcall TLANForm::Button1Click(TObject *Sender)
{
char szTmp[256],buf[4096];
int nSize=0;
UINT m_Port;
AnsiString addr;
addr=Addr->Text.Trim();
if(addr.IsEmpty()){
::MessageBox(0,"Please enter the server IP!","Error",MB_OK+MB_ICONERROR);
return;
}
unsigned long nAddr=inet_addr(addr.c_str());
if(nAddr==INADDR_NONE){
::MessageBox(0,"Bad Internet IP!","Error",MB_OK+MB_ICONERROR);
return;}
try
{
m_Port=Port->Text.ToInt();
}
catch(Exception &e)
{
::MessageBox(0,e.Message.c_str(),"Error",MB_OK+MB_ICONERROR);
return;
}
switch(Prot->ItemIndex)
{
case 0:
m_Protocol=TCP;
break;
case 1:
m_Protocol=UDP;
break;
}
if(TxtEdit->Text.IsEmpty()){
::MessageBox(0,"Please enter the text you want to send!","Error",MB_OK+MB_ICONERROR);
return;}
//Initialize Winsocket
WSAData wsaData;
::ZeroMemory(&wsaData,sizeof(WSAData));
WORD version=MAKEWORD(2,0);
if(::WSAStartup(version,&wsaData)){
sprintf(szTmp,"Failed to initial winsock enviroment!,error no:%d",::WSAGetLastError());
return;}
//Obtain the active connection
char ComputerName[255];
gethostname(ComputerName,255);
struct hostent* he=gethostbyname(ComputerName);
if(!he){
sprintf(szTmp,"Failed to get information to host!","Error",MB_OK+MB_ICONERROR);
::WSACleanup();
return;
}
//create new socket
m_Socket=INVALID_SOCKET;
switch(m_Protocol)
{
case TCP:
m_Socket=socket(AF_INET,SOCK_STREAM,0);
break;
case UDP:
m_Socket=socket(AF_INET,SOCK_DGRAM,0);
break;
}
责任编辑：小草
