Win32窗体工程--监控U盘插入和拔出(1)

原理说明：创建一个win32窗体程序。使用全局变量hWnd获取创建窗体的句柄。在winmain函数中创建窗体，同时将盘符改变的消息注册给窗体。在窗体回调函数中添加对盘符改变消息的响应处理即可。

 

// TestWin32.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "TestWin32.h"
#include
#include

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;        // current instance
TCHAR szTitle[MAX_LOADSTRING];     // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];   // the main window class name
HWND hWnd;    //自定义全局变量，窗体句柄

// Forward declarations of functions included in this code module:
ATOM    MyRegisterClass(HINSTANCE hInstance);
BOOL    InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);

 

//获取新增的盘符，即usb接口插入设备的盘符  光如此其实还是不够的，最好的就是使用GetDeviceType()函数对盘符加以判断
char FirstDriveFromMask (ULONG unitmask)
{
   char i;

   for (i = 0; i < 26; ++i)
   {
      if (unitmask & 0x1)
         break;
      unitmask = unitmask >> 1;
   }

   return (i + 'A');
}

 

///向窗体注册盘符改变 的消息
BOOL DoRegisterDeviceInterface(
          GUID InterfaceClassGuid,
          HDEVNOTIFY *hDevNotify
          )
          /*
          Routine Description:
          Registers for notification of changes in the device interfaces for
          the specified interface class GUID.

          Parameters:
          InterfaceClassGuid - The interface class GUID for the device
          interfaces.

          hDevNotify - Receives the device notification handle. On failure,
          this value is NULL.

          Return Value:
          If the function succeeds, the return value is TRUE.
          If the function fails, the return value is FALSE.
          */

{
 DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
 char szMsg[80];

 ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
 NotificationFilter.dbcc_size =
  sizeof(DEV_BROADCAST_DEVICEINTERFACE);
 NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
 NotificationFilter.dbcc_classguid = InterfaceClassGuid;

 *hDevNotify = RegisterDeviceNotification( hWnd,
  &NotificationFilter,
  DEVICE_NOTIFY_WINDOW_HANDLE
  );

 if(!*hDevNotify)
 {
  sprintf(szMsg, "RegisterDeviceNotification failed: %d/n",
   GetLastError());
  MessageBox(hWnd, szMsg, "Registration", MB_OK);       
  return FALSE;
 }

 return TRUE;
}

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
 UNREFERENCED_PARAMETER(hPrevInstance);
 UNREFERENCED_PARAMETER(lpCmdLine);

  // TODO: Place code here.
 MSG msg;
 HACCEL hAccelTable;

 // Initialize global strings
 LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
 LoadString(hInstance, IDC_TESTWIN32, szWindowClass, MAX_LOADSTRING);
 MyRegisterClass(hInstance);

 // Perform application initialization:
 if (!InitInstance (hInstance, nCmdShow))
 {
  return FALSE;
 }

 

//定义盘符改变消息的guid，并通过函数向窗体注册

 _GUID             GUID_DEVINTERFACE_USB_DEVICE;
 GUID_DEVINTERFACE_USB_DEVICE.Data1 = 0xA5DCBF10L;
 GUID_DEVINTERFACE_USB_DEVICE.Data2 = 0x6530;
 GUID_DEVINTERFACE_USB_DEVICE.Data3 = 0x11D2;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[0] = 0x90;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[1] = 0x1F;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[2] = 0x00;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[3] = 0xC0;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[4] = 0x4F;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[5] = 0xB9;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[6] = 0x51;
 GUID_DEVINTERFACE_USB_DEVICE.Data4[7] = 0xED;

 HDEVNOTIFY hDevNotify;
 DoRegisterDeviceInterface( GUID_DEVINTERFACE_USB_DEVICE, &hDevNotify);
 //WaitForSingleObject(hDevNotify, INFINITE);

 hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_TESTWIN32));

 // Main message loop:
 while (GetMessage(&msg, NULL, 0, 0))
 {
  if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
  }
 }

 return (int) msg.wParam;
}

 

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
 WNDCLASSEX wcex;

 wcex.cbSize = sizeof(WNDCLASSEX);

 wcex.style   = CS_HREDRAW | CS_VREDRAW;
 wcex.lpfnWndProc = WndProc;
 wcex.cbClsExtra  = 0;
 wcex.cbWndExtra  = 0;
 wcex.hInstance  = hInstance;
 wcex.hIcon   = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TESTWIN32));
 wcex.hCursor  = LoadCursor(NULL, IDC_ARROW);
 wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
 wcex.lpszMenuName = MAKEINTRESOURCE(IDC_TESTWIN32);
 wcex.lpszClassName = szWindowClass;
 wcex.hIconSm  = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

 return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

 

///显示窗体并刷新

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

 

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND - process the application menu
//  WM_PAINT - Paint the main window
//  WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 int wmId, wmEvent;
 PAINTSTRUCT ps;
 HDC hdc;

 switch (message)
 {
 case WM_COMMAND:
  wmId    = LOWORD(wParam);
  wmEvent = HIWORD(wParam);
  // Parse the menu selections:
  switch (wmId)
  {
  case IDM_ABOUT:
   DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
   break;
  case IDM_EXIT:
   DestroyWindow(hWnd);
   break;
  default:
   return DefWindowProc(hWnd, message, wParam, lParam);
  }
  break;
 case WM_PAINT:
  hdc = BeginPaint(hWnd, &ps);
  // TODO: Add any drawing code here...
  EndPaint(hWnd, &ps);
  break;
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
 ///////盘符改变的消息响应处理
 case WM_DEVICECHANGE:
        
         if(wParam == DBT_DEVICEARRIVAL) //设备激活
         {
             PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;
            
             PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
            
             char szMsg[80];
             sprintf (szMsg, "Drive %c: 被装载/n",
                 FirstDriveFromMask(lpdbv ->dbcv_unitmask));
            
             MessageBox(hWnd, szMsg, "WM_DEVICECHANGE", MB_OK);
            
         }
   else if(wParam == DBT_DEVICEREMOVECOMPLETE)
   {
    PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;
            
             PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
            
             char szMsg[80];
             sprintf (szMsg, "Drive %c: 被卸载/n",
                 FirstDriveFromMask(lpdbv ->dbcv_unitmask));
            
             MessageBox(hWnd, szMsg, "WM_DEVICECHANGE", MB_OK);
   }
        
         break;
 default:
  return DefWindowProc(hWnd, message, wParam, lParam);
 }
 return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
 UNREFERENCED_PARAMETER(lParam);
 switch (message)
 {
 case WM_INITDIALOG:
  return (INT_PTR)TRUE;

 case WM_COMMAND:
  if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
  {
   EndDialog(hDlg, LOWORD(wParam));
   return (INT_PTR)TRUE;
  }
  break;
 }
 return (INT_PTR)FALSE;
}