WINCE下实现流水灯的应用程序---线程的创建与使用

上次通过应用程序在WINCE操作系统下实现了LED灯的点亮与熄灭的控制，这里只是对寄存器进行一次性操作，如果需要寄存器时刻的变化，那需要怎么做呢？这里不同于简单的单片机，做个死循环，让寄存器不断的变化就行了，因为在WINCE底下是多任务系统。这样就涉及到了线程问题。

    具体的方法是建立一个线程，让应用程序去调用这个线程。当应用程序关闭的时候，线程也随着该进程的关闭而终止。仍然采用上文给出的流水灯的底层驱动实现流水灯和花样灯的控制。详细应用程序代码如下：

 

#include "stdafx.h"
#include "GPIOControl.h"
#include "GPIOControlDlg.h"
#include "GPIO.h"

HANDLE hFile=INVALID_HANDLE_VALUE;

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

DWORD g_dwThreadId = 0;
BOOL g_bOpen = TRUE;

/////////////////////////////////////////////////////////////////////////////
// CGPIOControlDlg dialog

CGPIOControlDlg::CGPIOControlDlg(CWnd* pParent )
 : CDialog(CGPIOControlDlg::IDD, pParent)
{
 //{{AFX_DATA_INIT(CGPIOControlDlg)
  // NOTE: the ClassWizard will add member initialization here
 //}}AFX_DATA_INIT
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CGPIOControlDlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 //{{AFX_DATA_MAP(CGPIOControlDlg)
  // NOTE: the ClassWizard will add DDX and DDV calls here
 //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CGPIOControlDlg, CDialog)
 //{{AFX_MSG_MAP(CGPIOControlDlg)
 ON_BN_CLICKED(IDC_OPEN_GPIO, OnOpenGpio)
 ON_BN_CLICKED(IDC_LED_OFF, OnLedOff)
 ON_BN_CLICKED(IDC_CLOSE_GPIO, OnCloseGpio)
 ON_BN_CLICKED(IDC_LED_ON, OnLedOn)
 ON_BN_CLICKED(IDC_FLOWLED, OnFlowled)
 ON_BN_CLICKED(IDC_SPECLED, OnSpecled)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGPIOControlDlg message handlers

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

 // 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
 
 CenterWindow(GetDesktopWindow()); // center to the hpc screen

 // TODO: Add extra initialization here
 
 return TRUE;  // return TRUE  unless you set the focus to a control
}

//打开GPIO驱动,这里LED0表示需要调用的驱动的名字。如果出错则无法打开驱动！
void CGPIOControlDlg::OnOpenGpio()
{
 hFile=CreateFile(TEXT("LED0:"),GENERIC_READ | GENERIC_WRITE,0,
      NULL,OPEN_EXISTING,0,0);
 if(hFile==INVALID_HANDLE_VALUE)
 {
  MessageBox(_T("打开GPIO驱动失败！"));
 }
 else
 {
  MessageBox(_T("打开GPIO驱动成功！"));
 }
}

//关闭GPIO驱动
void CGPIOControlDlg::OnCloseGpio()
{
 if(hFile!=INVALID_HANDLE_VALUE)
 {
  CloseHandle(hFile);
  MessageBox(_T("关闭GPIO驱动成功！"));
 }
 else
 {
  MessageBox(_T("关闭GPIO驱动失败！"));
 }
}

//
void CGPIOControlDlg::OnLedOff()
{
 BOOL ret;
 ret=::DeviceIoControl(hFile,IO_CTL_LED_ALL_OFF,NULL,
  1,NULL,0,NULL,NULL);
 if(ret!=TRUE)
 {
  MessageBox(_T("关闭LED失败！"));
  MessageBox(_T("请打开GPIO驱动！"));
 }
 g_bOpen = FALSE;
}

void CGPIOControlDlg::OnLedOn()
{
 BOOL ret;
 ret=::DeviceIoControl(hFile,IO_CTL_LED_ALL_ON,NULL,
  1,NULL,0,NULL,NULL);
 if(ret!=TRUE)
 {
  MessageBox(_T("点亮LED失败！"));
  MessageBox(_T("请打开GPIO驱动！"));
 }
}

//流水灯线程函数
DWORD WINAPI FlowThreadFunc(HANDLE Thread)
{
 static BOOL bCount = 0;
 while(g_bOpen)
 {
  if(hFile==INVALID_HANDLE_VALUE)
  {
   return 0;
  }  
  switch(bCount)
  {
  case 0: 
   DeviceIoControl(hFile,IO_CTL_LED_1_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 1:
   DeviceIoControl(hFile,IO_CTL_LED_2_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 2:
   DeviceIoControl(hFile,IO_CTL_LED_3_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 3:
   DeviceIoControl(hFile,IO_CTL_LED_4_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 4:
   DeviceIoControl(hFile,IO_CTL_LED_4_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 5:
   DeviceIoControl(hFile,IO_CTL_LED_3_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 6:
   DeviceIoControl(hFile,IO_CTL_LED_2_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 7:
   DeviceIoControl(hFile,IO_CTL_LED_1_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  default:
   break;
  }
  bCount ++;
  if(bCount>7)
  {
   bCount = 0;
  }
  Sleep(500);  
 }
 return 0;
}

//花样灯线程函数
DWORD WINAPI SpecThreadFunc(HANDLE Thread)
{
 static BOOL bCount = 0;
 while(g_bOpen)
 {
  if(hFile==INVALID_HANDLE_VALUE)
  {
   return 0;
  }
  DeviceIoControl(hFile,IO_CTL_LED_ALL_OFF,NULL,
    1,NULL,0,NULL,NULL);//熄灭所有灯
  switch(bCount)
  {
  case 0: //点亮LED1,4
   DeviceIoControl(hFile,IO_CTL_LED_1_ON,NULL,
    1,NULL,0,NULL,NULL);
   DeviceIoControl(hFile,IO_CTL_LED_4_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 1://点亮LED2,3
   DeviceIoControl(hFile,IO_CTL_LED_2_ON,NULL,
    1,NULL,0,NULL,NULL);
   DeviceIoControl(hFile,IO_CTL_LED_3_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 2://点亮LED1,4
   DeviceIoControl(hFile,IO_CTL_LED_1_ON,NULL,
    1,NULL,0,NULL,NULL);
   DeviceIoControl(hFile,IO_CTL_LED_4_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 3://全灭
   DeviceIoControl(hFile,IO_CTL_LED_ALL_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 4://全亮
   DeviceIoControl(hFile,IO_CTL_LED_ALL_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 5://全灭...
   DeviceIoControl(hFile,IO_CTL_LED_ALL_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 6://全亮...
   DeviceIoControl(hFile,IO_CTL_LED_ALL_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 7://全灭
   DeviceIoControl(hFile,IO_CTL_LED_ALL_OFF,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 8://全亮
   DeviceIoControl(hFile,IO_CTL_LED_ALL_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 9://LED1,3亮
   DeviceIoControl(hFile,IO_CTL_LED_1_ON,NULL,
    1,NULL,0,NULL,NULL);
   DeviceIoControl(hFile,IO_CTL_LED_3_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  case 10://LED2,4亮
   DeviceIoControl(hFile,IO_CTL_LED_2_ON,NULL,
    1,NULL,0,NULL,NULL);
   DeviceIoControl(hFile,IO_CTL_LED_4_ON,NULL,
    1,NULL,0,NULL,NULL);
   break;
  default:
   break;
  }
  bCount ++;
  if(bCount>11)
  {
   bCount = 0;
  }
  Sleep(500);  
 }
 return 0;
}

void CGPIOControlDlg::OnFlowled()
{
 g_bOpen = FALSE;
 Sleep(700);
 g_bOpen = TRUE;
 CreateThread(NULL,0,FlowThreadFunc,NULL,0,&g_dwThreadId);//调用一个线程
}

void CGPIOControlDlg::OnSpecled()
{
 g_bOpen = FALSE;
 Sleep(700);
 g_bOpen = TRUE;
 CreateThread(NULL,0,SpecThreadFunc,NULL,0,&g_dwThreadId);//调用一个线程 
}

这是一个对话框的代码，通过上面的按钮实现多种操作。