串口接收到的数据如何显示在MFC窗口上？

Question

一个串口接收数据的MFC程序，要求将串口接收到的数据实时显示在MFC窗口上。

Answer 1

Serial Communications

http://msdn.microsoft.com/en-us/library/ff802693.aspx

read information from a serial port mfc

http://stackoverflow.com/questions/7095569/read-information-from-a-serial-port-mfc

Answer 2

GT_MDRG 你好：

根据你的描述，这里我给你找了些代码，你可以参考。

BOOL CTryDlg::OnInitDialog() 
{ 
CDialog::OnInitDialog(); 
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 
ASSERT(IDM_ABOUTBOX < 0xF000); 
CMenu* pSysMenu = GetSystemMenu(FALSE); 
if (pSysMenu != NULL) 
{ 
  CString strAboutMenu; 
  strAboutMenu.LoadString(IDS_ABOUTBOX); 
  if (!strAboutMenu.IsEmpty()) 
  { 
   pSysMenu->AppendMenu(MF_SEPARATOR); 
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 
  } 
} 
// Set the icon for this dialog.  The framework does this automatically 
//  when the application's main window is not a dialog 

m_ctrlComm.SetCommPort(3); //选择COM3 
    m_ctrlComm.SetInputMode(1); //输入方式为二进制方式 
    m_ctrlComm.SetInBufferSize(1024); //设置输入缓冲区大小 
m_ctrlComm.SetOutBufferSize(512); //设置输出缓冲区大小 
//波特率9600，无校验，8个数据位，1个停止位 
m_ctrlComm.SetSettings("9600,n,8,1"); 
//参数1表示当串口接收缓冲区中有多于或者等于1个字符时将引发一个接收数据的OnOnCommMscomm1事件 
if(!m_ctrlComm.GetPortOpen()) 
  m_ctrlComm.SetPortOpen(1); 
m_ctrlComm.SetRThreshold(1); 
m_ctrlComm.SetInputLen(0); //设置当前接受区长度为0 
m_ctrlComm.GetInput(); //先预读缓冲区以清除残留数据 
return TRUE;  // return TRUE  unless you set the focus to a control 
} 
（2）void CTryDlg::OnOnCommMscomm1() //从串口接收数据并显示在接受编辑框中 
{ 
  VARIANT variant_inp; 
  COleSafeArray safearray_inp; 
  LONG len,k; 
  BYTE rxdata[2048]; 
  CString strtemp; 
  if(m_ctrlComm.GetCommEvent() == 2) //如果接收缓冲区内有字符 
  { 
    variant_inp = m_ctrlComm.GetInput(); //读缓冲区 
    safearray_inp = variant_inp; 
len = safearray_inp.GetOneDimSize(); //得到有效数据长度 
for(k=0;k<len;k++) 
{ 
     safearray_inp.GetElement(&k,rxdata+k); //转换为BYTE型数组 
} 
for(k=0;k<len;k++) //将数组转换为CString型数组 
{ 
     BYTE bt=*(char*)(rxdata+k); //字符型 
  strtemp.Format("%c",bt); 
  m_strEditRXDATA += strtemp; //加入接受编辑框对应字符 
} 
  } 
  UpdateData(0); 
} 
（3）void CAaaaDlg::OnOK() 
{ 
// TODO: Add extra validation here 

UpdateData(1); //读取编辑框内容 
//OnOnCommMscomm1(); 
m_ctrlComm.SetOutput(COleVariant(m_strEditTXDATA)); //发送数据 
    UpdateData(0); 
UpdateData(1); 
if(IDOK!=MessageBox("请稍等.....您的数据还正在传输中.....","请稍后",MB_OK|MB_ICONINFORMATION)) return; 
//for(int x=0;x<=5;x++) 
OnOnCommMscomm1();
}

希望可以帮助到你。

---

Sunny Cao
<THE CONTENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED>
Thanks
MSDN Community Support

Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.

Answer 3

GT_MDRG 你好：

根据你的描述，这里我给你找了些代码，你可以参考。

BOOL CTryDlg::OnInitDialog() 
{ 
CDialog::OnInitDialog(); 
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 
ASSERT(IDM_ABOUTBOX < 0xF000); 
CMenu* pSysMenu = GetSystemMenu(FALSE); 
if (pSysMenu != NULL) 
{ 
  CString strAboutMenu; 
  strAboutMenu.LoadString(IDS_ABOUTBOX); 
  if (!strAboutMenu.IsEmpty()) 
  { 
   pSysMenu->AppendMenu(MF_SEPARATOR); 
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 
  } 
} 
// Set the icon for this dialog.  The framework does this automatically 
//  when the application's main window is not a dialog 

m_ctrlComm.SetCommPort(3); //选择COM3 
    m_ctrlComm.SetInputMode(1); //输入方式为二进制方式 
    m_ctrlComm.SetInBufferSize(1024); //设置输入缓冲区大小 
m_ctrlComm.SetOutBufferSize(512); //设置输出缓冲区大小 
//波特率9600，无校验，8个数据位，1个停止位 
m_ctrlComm.SetSettings("9600,n,8,1"); 
//参数1表示当串口接收缓冲区中有多于或者等于1个字符时将引发一个接收数据的OnOnCommMscomm1事件 
if(!m_ctrlComm.GetPortOpen()) 
  m_ctrlComm.SetPortOpen(1); 
m_ctrlComm.SetRThreshold(1); 
m_ctrlComm.SetInputLen(0); //设置当前接受区长度为0 
m_ctrlComm.GetInput(); //先预读缓冲区以清除残留数据 
return TRUE;  // return TRUE  unless you set the focus to a control 
} 
（2）void CTryDlg::OnOnCommMscomm1() //从串口接收数据并显示在接受编辑框中 
{ 
  VARIANT variant_inp; 
  COleSafeArray safearray_inp; 
  LONG len,k; 
  BYTE rxdata[2048]; 
  CString strtemp; 
  if(m_ctrlComm.GetCommEvent() == 2) //如果接收缓冲区内有字符 
  { 
    variant_inp = m_ctrlComm.GetInput(); //读缓冲区 
    safearray_inp = variant_inp; 
len = safearray_inp.GetOneDimSize(); //得到有效数据长度 
for(k=0;k<len;k++) 
{ 
     safearray_inp.GetElement(&k,rxdata+k); //转换为BYTE型数组 
} 
for(k=0;k<len;k++) //将数组转换为CString型数组 
{ 
     BYTE bt=*(char*)(rxdata+k); //字符型 
  strtemp.Format("%c",bt); 
  m_strEditRXDATA += strtemp; //加入接受编辑框对应字符 
} 
  } 
  UpdateData(0); 
} 
（3）void CAaaaDlg::OnOK() 
{ 
// TODO: Add extra validation here 

UpdateData(1); //读取编辑框内容 
//OnOnCommMscomm1(); 
m_ctrlComm.SetOutput(COleVariant(m_strEditTXDATA)); //发送数据 
    UpdateData(0); 
UpdateData(1); 
if(IDOK!=MessageBox("请稍等.....您的数据还正在传输中.....","请稍后",MB_OK|MB_ICONINFORMATION)) return; 
//for(int x=0;x<=5;x++) 
OnOnCommMscomm1();
}

希望可以帮助到你。

---

Sunny Cao
<THE CONTENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED>
Thanks
MSDN Community Support

Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.

非常感谢你的回答，但……我的程序有一个窗口类，还有一个串口类，在串口类里面调用updatedata()会提示找不到标示符，这个问题如何解决呢？是否可以在串口类里面获取主窗口句柄，然后给主窗口发消息？

Answer 4

AfxGetMainWnd()可以得到主对话框类的CWnd*指针，这样就可以PostMessage/SendMessage给主窗口了。

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Visual C++ enthusiast, like network programming and driver development. At present is being engaged in the WinCE/Windows Mobile platform embedded development.