求教，为什么我的串口助手无法接收数据，可发送数据

[qq_34272468]

// MSCommDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MSComm.h"
#include "MSCommDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMSCommDlg dialog

CMSCommDlg::CMSCommDlg(CWnd* pParent /*=NULL*/)
: CDialog(CMSCommDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CMSCommDlg)
m_strTXData = _T("");
m_strRXData = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMSCommDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CMSCommDlg)
DDX_Control(pDX, IDC_STOPBITS, m_cStopBits);
DDX_Control(pDX, IDC_PORT, m_cPort);
DDX_Control(pDX, IDC_PARITY, m_cParity);
DDX_Control(pDX, IDC_DATABITS, m_cDataBits);
DDX_Control(pDX, IDC_BAUD, m_cBaud);
DDX_Control(pDX, IDC_MSCOMM1, m_ctrlComm);
DDX_Text(pDX, IDC_EDIT_TXDATA, m_strTXData);
DDX_Text(pDX, IDC_EDIT_RXDATA, m_strRXData);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMSCommDlg, CDialog)
//{{AFX_MSG_MAP(CMSCommDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_MANUALSEND, OnButtonManualsend)
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_CBN_SELCHANGE(IDC_PORT, OnSelchangePort)
ON_CBN_SELCHANGE(IDC_BAUD, OnSelchangeBaud)
ON_CBN_SELCHANGE(IDC_DATABITS, OnSelchangeDatabits)
ON_CBN_SELCHANGE(IDC_STOPBITS, OnSelchangeStopbits)
ON_CBN_SELCHANGE(IDC_PARITY, OnSelchangeParity)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMSCommDlg message handlers

BOOL CMSCommDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
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
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here

m_cPort.SetCurSel(0);
m_cBaud.SetCurSel(0);
m_cDataBits.SetCurSel(0);
m_cStopBits.SetCurSel(0);
m_cParity.SetCurSel(0);
if(m_ctrlComm.GetPortOpen())
{
m_ctrlComm.SetPortOpen(false);//关闭串口
SetDlgItemText(IDC_BUTTON1,"打开串口");

}
m_ctrlComm.SetCommPort(1);//打开软件时默认使用COM1串口

if(!m_ctrlComm.GetPortOpen())
{
m_ctrlComm.SetPortOpen(TRUE);//打开串口
SetDlgItemText(IDC_BUTTON1,"关闭串口");
}
else
{
AfxMessageBox("cannot open serial port");
}
m_ctrlComm.SetSettings("9600,n,8,1");//打开软件时端口设置默认为波特率9600,无校验位，8位数据，1位停止位
m_ctrlComm.SetInputMode(1);//1:表示以二进制方式检取数据
m_ctrlComm.SetRThreshold(1);//参数1表示每当串口接收缓冲区中有多于或等于1个字符串时将引发接收数据的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
return TRUE; // return TRUE unless you set the focus to a control
}

void CMSCommDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CMSCommDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CMSCommDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

BEGIN_EVENTSINK_MAP(CMSCommDlg, CDialog)
//{{AFX_EVENTSINK_MAP(CMSCommDlg)
ON_EVENT(CMSCommDlg, IDC_MSCOMM1, 1 /* OnComm */, OnComm, VTS_NONE)
//}}AFX_EVENTSINK_MAP
END_EVENTSINK_MAP()

void CMSCommDlg::OnComm()
{
// TODO: Add your control notification handler code here
VARIANT variant_inp;//定义一个VARIANT类对象
COleSafeArray safearray_inp;//定义一个COleSafeArray对象
LONG len,k;
BYTE rxdata[2048];//设置BYTE数组 AN8-intterthat is not signed
CString strtemp;
if(m_ctrlComm.GetCommEvent()==2)//事件值为2表示接受缓冲区内有数据
{
variant_inp=m_ctrlComm.GetInput();
safearray_inp=variant_inp;//VARIANT型变量转换为ColeSafeArray型变量
len=safearray_inp.GetOneDimSize();
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型变量
{
BYTE bt=*(char*)(rxdata+k);
// if(m_ctrlHexSend.GetCheck())//如果是HEX显示则转为16进制
// strtemp.Format("%02x",bt);//将16进制数送入临时变量strtemp存放
// else
strtemp.Format("%c",bt);//将字符送入临时变量strtemp存放
m_strRXData+=strtemp;//加入接收编码框对应字符串
}
}
UpdateData(FALSE);//更新编辑框内容
}

void CMSCommDlg::OnButtonManualsend()
{
// TODO: Add your control notification handler code here
/* UpdateData(TRUE);//读取编辑框内容
m_ctrlComm.SetOutput(COleVariant(m_strTXData));//发送数据
*/
if(!m_ctrlComm.GetPortOpen())
AfxMessageBox("请打开串口");
else
{
UpdateData(TRUE);
m_ctrlComm.SetOutput(COleVariant(m_strTXData));
}
}

void CMSCommDlg::OnButton1()
{
// TODO: Add your control notification handler code here
if(m_nPort<0)
{
switch(m_ctrlComm.GetPortOpen())
{
case 0:m_ctrlComm.SetCommPort(1);
m_ctrlComm.SetPortOpen(TRUE);
SetDlgItemText(IDC_BUTTON1,"关闭串口");
UpdateData(FALSE);
break;
case 1:m_ctrlComm.SetPortOpen(FALSE);
SetDlgItemText(IDC_BUTTON1,"打开串口");
UpdateData(FALSE);
break;



default:AfxMessageBox("cannot open or close serial port");
}
}
else
{
switch(m_ctrlComm.GetPortOpen())
{
case 0:m_ctrlComm.SetCommPort(m_nPort+1);
m_ctrlComm.SetPortOpen(TRUE);
SetDlgItemText(IDC_BUTTON1,"关闭串口");
UpdateData(FALSE);
break;
case 1:m_ctrlComm.SetPortOpen(FALSE);
SetDlgItemText(IDC_BUTTON1,"打开串口");
UpdateData(FALSE);
break;
default:AfxMessageBox("cannot open or close serial port");
}
}
if(m_nPort<0)
((CComboBox*)GetDlgItem(IDC_PORT))->SetCurSel(0);
if(m_nBaud<0)
((CComboBox*)GetDlgItem(IDC_BAUD))->SetCurSel(0);
if(m_nDataBits<0)
((CComboBox*)GetDlgItem(IDC_DATABITS))->SetCurSel(0);
if(m_nParity<0)
((CComboBox*)GetDlgItem(IDC_PARITY))->SetCurSel(0);
if(m_nStopBits<0)
((CComboBox*)GetDlgItem(IDC_STOPBITS))->SetCurSel(0);

}

void CMSCommDlg::OnSelchangePort()
{
// TODO: Add your control notification handler code here
m_nPort=((CComboBox*)GetDlgItem(IDC_PORT))->GetCurSel();
((CComboBox*)GetDlgItem(IDC_PORT))->SetCurSel(m_nPort);
if(m_ctrlComm.GetPortOpen())
{
m_ctrlComm.SetPortOpen(FALSE);
}
SetDlgItemText(IDC_BUTTON1,"打开串口");
}

void CMSCommDlg::OnSelchangeBaud()
{
// TODO: Add your control notification handler code here
UpdateData(TRUE);
m_nBaud=((CComboBox*)GetDlgItem(IDC_BAUD))->GetCurSel();
((CComboBox*)GetDlgItem(IDC_BAUD))->SetCurSel(m_nBaud);
switch(m_nBaud)
{
case 1: m_ctrlComm.SetSettings("14400,,,");break;
case 2: m_ctrlComm.SetSettings("19200,,,");break;
case 3: m_ctrlComm.SetSettings("38400,,,");break;
case 4: m_ctrlComm.SetSettings("56000,,,");break;
case 5: m_ctrlComm.SetSettings("57600,,,");break;
case 6: m_ctrlComm.SetSettings("115200,,,");break;
case 7: m_ctrlComm.SetSettings("128000,,,");break;
case 8: m_ctrlComm.SetSettings("256000,,,");break;
default: m_ctrlComm.SetSettings("9600,,,");break;
}
UpdateData(FALSE);
}

void CMSCommDlg::OnSelchangeDatabits()
{
// TODO: Add your control notification handler code here
UpdateData(true);
m_nDataBits=((CComboBox*)GetDlgItem(IDC_DATABITS))->GetCurSel();
((CComboBox*)GetDlgItem(IDC_DATABITS))->SetCurSel(m_nDataBits);
switch(m_nDataBits)
{
case 1:m_ctrlComm.SetSettings(",,7,");break;
case 2: m_ctrlComm.SetSettings(",,6,");break;
case 3: m_ctrlComm.SetSettings(",,5,");break;
case 4: m_ctrlComm.SetSettings(",,4,");break;
default: m_ctrlComm.SetSettings(",,8,");break;
}
UpdateData(FALSE);
}

void CMSCommDlg::OnSelchangeStopbits()
{
// TODO: Add your control notification handler code here
UpdateData(TRUE);
m_nStopBits=((CComboBox*)GetDlgItem(IDC_STOPBITS))->GetCurSel();
((CComboBox*)GetDlgItem(IDC_STOPBITS))->SetCurSel(m_nStopBits);
switch(m_nStopBits)
{
case 1:m_ctrlComm.SetSettings(",,,2");break;
default:m_ctrlComm.SetSettings(",,,1");break;
}
UpdateData(FALSE);
}

[qq_34272468]

void CMSCommDlg::OnSelchangePort() { // TODO: Add your control notification handler code here m_nPort=((CComboBox*)GetDlgItem(IDC_PORT))->GetCurSel(); ((CComboBox*)GetDlgItem(IDC_PORT))->SetCurSel(m_nPort); if(m_ctrlComm.GetPortOpen()) { m_ctrlComm.SetPortOpen(FALSE); } SetDlgItemText(IDC_BUTTON1,"打开串口"); } void CMSCommDlg::OnSelchangeBaud() { // TODO: Add your control notification handler code here UpdateData(TRUE); m_nBaud=((CComboBox*)GetDlgItem(IDC_BAUD))->GetCurSel(); ((CComboBox*)GetDlgItem(IDC_BAUD))->SetCurSel(m_nBaud); switch(m_nBaud) { case 1: m_ctrlComm.SetSettings("14400,,,");break; case 2: m_ctrlComm.SetSettings("19200,,,");break; case 3: m_ctrlComm.SetSettings("38400,,,");break; case 4: m_ctrlComm.SetSettings("56000,,,");break; case 5: m_ctrlComm.SetSettings("57600,,,");break; case 6: m_ctrlComm.SetSettings("115200,,,");break; case 7: m_ctrlComm.SetSettings("128000,,,");break; case 8: m_ctrlComm.SetSettings("256000,,,");break; default: m_ctrlComm.SetSettings("9600,,,");break; } UpdateData(FALSE); } void CMSCommDlg::OnSelchangeDatabits() { // TODO: Add your control notification handler code here UpdateData(true); m_nDataBits=((CComboBox*)GetDlgItem(IDC_DATABITS))->GetCurSel(); ((CComboBox*)GetDlgItem(IDC_DATABITS))->SetCurSel(m_nDataBits); switch(m_nDataBits) { case 1:m_ctrlComm.SetSettings(",,7,");break; case 2: m_ctrlComm.SetSettings(",,6,");break; case 3: m_ctrlComm.SetSettings(",,5,");break; case 4: m_ctrlComm.SetSettings(",,4,");break; default: m_ctrlComm.SetSettings(",,8,");break; } UpdateData(FALSE); } void CMSCommDlg::OnSelchangeStopbits() { // TODO: Add your control notification handler code here UpdateData(TRUE); m_nStopBits=((CComboBox*)GetDlgItem(IDC_STOPBITS))->GetCurSel(); ((CComboBox*)GetDlgItem(IDC_STOPBITS))->SetCurSel(m_nStopBits); switch(m_nStopBits) { case 1:m_ctrlComm.SetSettings(",,,2");break; default:m_ctrlComm.SetSettings(",,,1");break; } UpdateData(FALSE); } void CMSCommDlg::OnSelchangeParity() { // TODO: Add your control notification handler code here UpdateData(TRUE); m_nParity=((CComboBox*)GetDlgItem(IDC_PARITY))->GetCurSel(); ((CComboBox*)GetDlgItem(IDC_PARITY))->SetCurSel(m_nParity); switch(m_nParity) { case 1:m_ctrlComm.SetSettings(",O,,");break; case 2:m_ctrlComm.SetSettings(",O,,");break; default:m_ctrlComm.SetSettings(",N,,");break; } UpdateData(FALSE); }

[笨笨仔]

楼主将程序全部搬上来了，在显示类型中选择一下“C/C++”呀，否则如何看？

[赵4老师]

没准是串口线断了或太长。

[qq_31812171]

请问楼主怎么解决的？

[qq_36634306]

断点调串口的响应啊，看一下缓冲区。

[草履虫程序员]

你有串口调试工具吗？直接打开，测试。