串口只能发送不能接收
VC编写串口上位机只能发送不能接收，准确来说应该是数据接收到了，但在显示框中就是没有显示出来。这是一个很简单程序，只是测试串口能否工作，但对于我这样一个初学者就是找不出原因，望各位高手帮忙看看。主代码如下：
// 0202Dlg.cpp : implementation file
//
#include "stdafx.h"
#include "0202.h"
#include "0202Dlg.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()
/////////////////////////////////////////////////////////////////////////////
// CMy0202Dlg dialog
CMy0202Dlg::CMy0202Dlg(CWnd* pParent /*=NULL*/)
: CDialog(CMy0202Dlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CMy0202Dlg)
m_strSend = _T("");
m_strReceive = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CMy0202Dlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CMy0202Dlg)
DDX_Control(pDX, IDC_receive, m_ctrlReceive);
DDX_Control(pDX, IDC_MSCOMM1, m_ctrlComm);
DDX_Text(pDX, IDC_send, m_strSend);
DDX_Text(pDX, IDC_receive, m_strReceive);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CMy0202Dlg, CDialog)
//{{AFX_MSG_MAP(CMy0202Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_HELPP, OnHelpp)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CMy0202Dlg message handlers
BOOL CMy0202Dlg::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_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
m_ctrlComm.SetSettings("9600,n,8,1"); //波特率9600无校验，8个数据位，1个停止位
if(!m_ctrlComm.GetPortOpen())
m_ctrlComm.SetPortOpen(TRUE); //打开串口
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_strSend="HanSen";
return TRUE;// return TRUEunless you set the focus to a control
}
void CMy0202Dlg::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 CMy0202Dlg::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 CMy0202Dlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
BEGIN_EVENTSINK_MAP(CMy0202Dlg, CDialog)
//{{AFX_EVENTSINK_MAP(CMy0202Dlg)
ON_EVENT(CMy0202Dlg, IDC_MSCOMM1, 1 /* OnComm */, OnOnCommMscomm1, VTS_NONE)
//}}AFX_EVENTSINK_MAP
END_EVENTSINK_MAP()
void CMy0202Dlg::OnOnCommMscomm1()
{
// TODO: Add your control notification handler code here
VARIANT variant_inp;
COleSafeArray safearray_inp;
LONG len,k;
BYTE rxdata; //设置BYTE数组
CString strtemp;
if(m_ctrlComm.GetCommEvent()==2) //事件值为2表示接收缓冲区内有字符
{
variant_inp=m_ctrlComm.GetInput(); //读缓冲区
safearray_inp=variant_inp; //VARIANT型变量转换为ColeSafeArray型变量
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型变量
{
BYTE bt=*(char*)(rxdata+k); // 字符型
strtemp.Format("%c",bt); // 将字符送入临时变量strtemp存放
m_strReceive+=strtemp; // 加入接收编辑框对应字符串
}
}
UpdateData(FALSE);//更新编辑框内容
}
void CMy0202Dlg::OnCancel()
{
// TODO: Add extra cleanup here
m_ctrlComm.SetPortOpen(0);
CDialog::OnCancel();
}
void CMy0202Dlg::OnOK()
{
UpdateData(TRUE); //读取编辑框内容
m_ctrlComm.SetOutput(COleVariant(m_strSend));//发送数据
}
void CMy0202Dlg::OnHelpp()
{
m_strReceive = ("这是一款完全免费的串口调试工具");
UpdateData(FALSE);
}
工程文件：
点击此处下载 ourdev_633768RMCS7Q.rar(文件大小:96K) (原文件名:0202.rar)
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