case语句中定义变量要加括号

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map<USERNAME,PASSWORD>::iterator it;map<USERNAME,SOCKID>::iterator itID;recv(AcceptSocket,(char*)&RecvBuf,sizeof(RecvBuf),0);switch(RecvBuf.Protocol){case REGISTE:map<USERNAME,PASSWORD>::iterator it;//报错：it由“case”标签跳过for(it=m_mUserPassword.begin();it!=m_mUserPassword.end();it++){if(it->first==RecvBuf.SourUser){SendBuf.Protocol = REGISTE_FAIL;send(AcceptSocket,(char*)&SendBuf,sizeof(SendBuf),0);break;}}if(it == m_mUserPassword.end()){m_mUserPassword[(LPTSTR)RecvBuf.SourUser] = (LPTSTR)RecvBuf.Password;SendBuf.Protocol = REGISTE_SUCC;send(AcceptSocket,(char*)&SendBuf,sizeof(SendBuf),0);UpdateData(1);m_editInfo += "\r\n";m_editInfo += RecvBuf.SourUser;m_editInfo += "注册成功";UpdateData(0);}break;case LOAD:it = m_mUserPassword.find(RecvBuf.SourUser);if(it == m_mUserPassword.end()||it->second != RecvBuf.Password){SendBuf.Protocol = LOAD_FAIL;send(AcceptSocket,(char*)&SendBuf,sizeof(SendBuf),0);str.Format("%s\r\n%s 验证失败",m_editInfo,RecvBuf.SourUser);m_EditInfo.SetWindowTextA(str);}else{SendBuf.Protocol = LOAD_SUCC;OnLineUser += RecvBuf.SourUser;OnLineUser += ",";strcpy_s(SendBuf.Msg,OnLineUser.GetBuffer(0));send(AcceptSocket,(char*)&SendBuf,sizeof(SendBuf),0);m_mUserSocket[RecvBuf.SourUser]=AcceptSocket;str.Format("%s\r\n%s 验证成功",m_editInfo,RecvBuf.SourUser);m_EditInfo.SetWindowTextA(str);}break;case TOALL:for(itID=m_mUserSocket.begin();itID!=m_mUserSocket.end();itID++){if(itID->first!=RecvBuf.SourUser){send(itID->second,(char*)&RecvBuf,sizeof(RecvBuf),0);}}break;case TOSINGLE:send(m_mUserSocket[RecvBuf.DestUser],(char*)&RecvBuf\,sizeof(RecvBuf),0);break;default:break;}

解决办法：

1，case语句加括号

2，将变量放在switch语句之前定义

比较：方法二较好，因为可以减少缩进，不至于让代码整体向后缩进影响外观和可读性。