扔掉Socket实现网络编程(2)
建一对话框IDD_Addr，用来输入IP地址和Port；增加两个Edit控件：IDC_Addr、IDC_Port按下表在ClassWizard中为CAddrDlg类添加变量。
Control ID Type Member
IDC_Addr CString m_Addr
IDC_Port Int m_Port
在CSockClientDlg.ccp中添加代码：
#include "AddrDlg.h"
protected:
int TryCount;
MySock m_clientSocket;
UINT m_szPort;
public:
char m_szServerAdr[256];
双击IDD_CSOCKCLIENT_DIALOG对话框中的“连接”按钮，添加以下代码：
m_clientSocket.ShutDown(2);
m_clientSocket.m_hSocket=INVALID_SOCKET;
m_clientSocket.m_bConnected=FALSE;
CAddrDlg m_Dlg;
m_Dlg.m_Port=1088;//默认端口1088
if (m_Dlg.DoModal()==IDOK && !m_Dlg.m_Addr.IsEmpty())
{ memcpy(m_szServerAdr,m_Dlg.m_Addr,sizeof(m_szServerAdr));
m_szPort=m_Dlg.m_Port;
SetTimer(1,1000,NULL);//建立计时器，每1秒尝试连接一次
TryCount=0;}
添加Windows消息WM_TIMER响应函数OnTimer
void CCSockClientDlg::OnTimer(UINT nIDEvent)
{ if (m_clientSocket.m_hSocket==INVALID_SOCKET)
{ BOOL bFlag=m_clientSocket.Create(0,SOCK_STREAM,FD_CONNECT);
if(!bFlag)
{ AfxMessageBox("Socket Error!");
m_clientSocket.Close();
PostQuitMessage(0);
return;}}
m_clientSocket.Connect(m_szServerAdr,m_szPort);
TryCount++;
if (TryCount >=10 || m_clientSocket.m_bConnected)
{ KillTimer(1);
if (TryCount >=10)
AfxMessageBox("Connect Failed!");
return;}
CDialog::OnTimer(nIDEvent);}
双击IDD_CSOCKCLIENT_DIALOG对话框中的“发送”按钮，添加以下代码：
void CCSockClientDlg::OnSend()
{if (m_clientSocket.m_bConnected)
{ m_clientSocket.m_nLength=m_MSG.GetWindowText
(m_clientSocket.m_szBuffer, sizeof(m_clientSocket.m_szBuffer));
m_clientSocket.AsyncSelect(FD_WRITE);
m_MSG.SetWindowText("");}}
双击IDD_CSOCKCLIENT_DIALOG对话框中的“关闭”按钮，添加以下代码：
void CCSockClientDlg::OnExit()
{ m_clientSocket.ShutDown(2); //关闭Socket
EndDialog(0);}
运行此项目，连接时输入主机名或IP均可，CAsyncSocket类会自动处理。
