MSCOMM控件有关问题

MSCOMM控件问题
本人最近在用MSCOMM控件写一个串口通信的程序，像波特率，校验位这些都用组合框做的，希望用户在选择后能传入到该控件的SetSettings属性中。但是老是传不进去，希望大虾给点解决的方法。

[解决办法]
不会，我刚写的程序，就是你的这种情况。

我的程序可以。

你首先给各个组合框添加CBN_SELCHANGE事件相应函数:
---------------------------------
void CLMS291Dlg::OnSelchangeComname()
{
// TODO: Add your control notification handler code here
SettingChanged();
}

void CLMS291Dlg::OnSelchangeBaud()
{
// TODO: Add your control notification handler code here
SettingChanged();
}

void CLMS291Dlg::OnSelchangeDataBit()
{
// TODO: Add your control notification handler code here
SettingChanged();
}

void CLMS291Dlg::OnSelchangeParity()
{
// TODO: Add your control notification handler code here
SettingChanged();
}

void CLMS291Dlg::OnSelchangeStopBit()
{
// TODO: Add your control notification handler code here
SettingChanged();
}
---------------------------------
void CLMS291Dlg::SettingChanged()
{
if (m_ctrlCOMName.SetCurSel(m_ctrlCOMName.GetCurSel()) == CB_ERR ||
m_ctrlBaud.SetCurSel(m_ctrlBaud.GetCurSel()) == CB_ERR ||
m_ctrlDataBit.SetCurSel(m_ctrlDataBit.GetCurSel()) == CB_ERR ||
m_ctrlParity.SetCurSel(m_ctrlParity.GetCurSel()) == CB_ERR ||
m_ctrlStopBit.SetCurSel(m_ctrlStopBit.GetCurSel()) == CB_ERR)
{
::AfxMessageBox( "error occur in SettingChanged() ");
return ;
}

if (m_ctrlComm.GetPortOpen())//opened
{
this-> UpdateData(TRUE);//读取内容
if (m_szCOMName.IsEmpty() ||m_szParity.IsEmpty() ||
m_szDataBit.IsEmpty() ||m_szStopBit.IsEmpty() ||
m_szBaud.IsEmpty())
{
::AfxMessageBox( "请设置好通信参数 ");
return ;
}
CStringszSetting;
szSetting = m_szBaud + ", ";
CString parity;
if (m_szParity == "None ")
parity = "n ";
else if (m_szParity == "Odd ")
parity = "o ";
else if (m_szParity == "Even ")
parity = "e ";
else if (m_szParity == "Mark ")
parity = "m ";
else if (m_szParity == "Space ")
parity = "s ";
else
{
::AfxMessageBox( "请设置好校验方式 ");
parity = "n ";
return ;
}

szSetting += parity + ", ";
szSetting += m_szDataBit + ", ";
szSetting += m_szStopBit;
//::AfxMessageBox(szSetting);

if (m_szCOMName == "COM1 " ||
m_szCOMName == "COM2 ")
{
m_ctrlComm.SetPortOpen(FALSE);//先关闭
if (m_szCOMName == "COM1 ")m_ctrlComm.SetCommPort(1);
if (m_szCOMName == "COM2 ")m_ctrlComm.SetCommPort(2);
}
else
{
::AfxMessageBox( "COM端口不对 ");
//m_ctrlComm.SetPortOpen(FALSE);
return ;
}

m_ctrlComm.SetPortOpen(TRUE);//打开串口
//m_szStatus = "打开 ";
this-> UpdateData(FALSE);
m_ctrlComm.SetSettings(szSetting);
m_ctrlComm.SetInputMode(1);//1：表示以二进制方式检取数据
m_ctrlComm.SetRThreshold(1);//为1表示有一个字符引发一个事件
m_ctrlComm.SetSThreshold(1); //参数1表示每当串口接收缓冲区中有
//多于或等于1个字符时将引发一个接收数据的OnComm事件
m_ctrlComm.SetInputLen(0);//设置当前接收区数据长度为0
m_ctrlComm.GetInput();//先预读缓冲区以清除残留数据
//m_ctrlComm.SetInBufferSize(16);//设置输入缓冲区的大小，Bytes
//m_ctrlComm.SetOutBufferSize(16);//设置输入缓冲区的大小，Bytes

}
else
{
this-> UpdateData(TRUE);//读取内容
}
}