月度归档： 2013 年 5 月

上面一篇文章给出了 Delphi 版本获得当前系统增加/移除USB设备名称的方法。这篇给出一个VC 的版本。编译器为 VS2008 Express，代码如下

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <strsafe.h>
#include <dbt.h>
#include <Shellapi.h>
// This GUID is for all USB 
/* A5DCBF10-6530-11D2-901F-00C04FB951ED */
GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10L, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED };
// For informational messages and window titles
PWSTR g_pszAppName;
// Forward declarations
void OutputMessage(HWND hOutWnd, WPARAM wParam, LPARAM lParam);
void ErrorHandler(LPTSTR lpszFunction);
//
// DoRegisterDeviceInterfaceToHwnd
//
BOOL DoRegisterDeviceInterfaceToHwnd( 
    IN GUID InterfaceClassGuid, 
    IN HWND hWnd,
    OUT HDEVNOTIFY *hDeviceNotify 
)
// Routine Description:
//     Registers an HWND for notification of changes in the device interfaces
//     for the specified interface class GUID.
// Parameters:
//     InterfaceClassGuid - The interface class GUID for the device 
//         interfaces.
//     hWnd - Window handle to receive notifications.
//     hDeviceNotify - 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.
// Note:
//     RegisterDeviceNotification also allows a service handle be used,
//     so a similar wrapper function to this one supporting that scenario
//     could be made from this template.
{
    DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
    ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
    NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    NotificationFilter.dbcc_classguid = InterfaceClassGuid;
    *hDeviceNotify = RegisterDeviceNotification( 
        hWnd,                       // events recipient
        &NotificationFilter,        // type of device
        DEVICE_NOTIFY_WINDOW_HANDLE // type of recipient handle
        );
    if ( NULL == *hDeviceNotify ) 
    {
        ErrorHandler(TEXT("RegisterDeviceNotification"));
        return FALSE;
    }
    return TRUE;
}
//
// MessagePump
//
void MessagePump(
    HWND hWnd
)
// Routine Description:
//     Simple main thread message pump.
//
// Parameters:
//     hWnd - handle to the window whose messages are being dispatched
// Return Value:
//     None.
{
    MSG msg; 
    int retVal;
    // Get all messages for any window that belongs to this thread,
    // without any filtering. Potential optimization could be
    // obtained via use of filter values if desired.
    while( (retVal = GetMessage(&msg, NULL, 0, 0)) != 0 ) 
    { 
        if ( retVal == -1 )
        {
            ErrorHandler(TEXT("GetMessage"));
            break;
        }
        else
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    } 
}
//
// WinProcCallback
//
INT_PTR WINAPI WinProcCallback(
                              HWND hWnd,
                              UINT message,
                              WPARAM wParam,
                              LPARAM lParam
                              )
// Routine Description:
//     Simple Windows callback for handling messages.
//     This is where all the work is done because the example
//     is using a window to process messages. This logic would be handled 
//     differently if registering a service instead of a window.
// Parameters:
//     hWnd - the window handle being registered for events.
//     message - the message being interpreted.
//     wParam and lParam - extended information provided to this
//          callback by the message sender.
//     For more information regarding these parameters and return value,
//     see the documentation for WNDCLASSEX and CreateWindowEx.
{
    LRESULT lRet = 1;
    static HDEVNOTIFY hDeviceNotify;
    static HWND hEditWnd;
    static ULONGLONG msgCount = 0;
	
	switch (message)
    {
    case WM_CREATE:
        //
        // This is the actual registration., In this example, registration 
        // should happen only once, at application startup when the window
        // is created.
        //
        // If you were using a service, you would put this in your main code 
        // path as part of your service initialization.
        //
        if ( ! DoRegisterDeviceInterfaceToHwnd(
                        GUID_DEVINTERFACE_USB_DEVICE, 
                        hWnd,
                        &hDeviceNotify) )
        {
            // Terminate on failure.
            ErrorHandler(TEXT("DoRegisterDeviceInterfaceToHwnd"));
            ExitProcess(1);
        }

        //
        // Make the child window for output.
        //
        hEditWnd = CreateWindow(TEXT("EDIT"),// predefined class 
                                NULL,        // no window title 
                                WS_CHILD | WS_VISIBLE | WS_VSCROLL | 
                                ES_LEFT | ES_MULTILINE | ES_AUTOVSCROLL, 
                                0, 0, 0, 0,  // set size in WM_SIZE message 
                                hWnd,        // parent window 
                                (HMENU)1,    // edit control ID 
                                (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE), 
                                NULL);       // pointer not needed
        if ( hEditWnd == NULL )
        {
            // Terminate on failure.
            ErrorHandler(TEXT("CreateWindow: Edit Control"));
            ExitProcess(1);
        }
        // Add text to the window. 
        SendMessage(hEditWnd, WM_SETTEXT, 0, 
            (LPARAM)TEXT("Registered for USB device notification...\n"));
        break;
    case WM_SETFOCUS: 
        SetFocus(hEditWnd);
        break;
    case WM_SIZE: 
        // Make the edit control the size of the window's client area. 
        MoveWindow(hEditWnd, 
                   0, 0,                  // starting x- and y-coordinates 
                   LOWORD(lParam),        // width of client area 
                   HIWORD(lParam),        // height of client area 
                   TRUE);                 // repaint window
        break;
    case WM_DEVICECHANGE :
    {
        //
        // This is the actual message from the interface via Windows messaging.
        // This code includes some additional decoding for this particular device type
        // and some common validation checks.
        //
        // Note that not all devices utilize these optional parameters in the same
        // way. Refer to the extended information for your particular device type 
        // specified by your GUID.
        //
        PDEV_BROADCAST_DEVICEINTERFACE b = (PDEV_BROADCAST_DEVICEINTERFACE) lParam;
        TCHAR strBuff[256];
        // Output some messages to the window.
        switch (wParam)
        {
        case DBT_DEVICEARRIVAL:
            msgCount++;
            StringCchPrintf(
                strBuff, 256, 
                TEXT("Message %d: DBT_DEVICEARRIVAL\n"), msgCount);
        OutputMessage(hEditWnd, wParam, (LPARAM)strBuff);
            StringCchPrintf(
                strBuff, 256, 
				TEXT("USB Device information: \n"));
        OutputMessage(hEditWnd, wParam, (LPARAM)strBuff);
		//MultiByteToWideChar(CP_ACP, 0, strBuff,256,b->dbcc_name,sizeof(b->dbcc_name));
        OutputMessage(hEditWnd, wParam, (LPARAM)b->dbcc_name);
            break;
        case DBT_DEVICEREMOVECOMPLETE:
            msgCount++;
            StringCchPrintf(
                strBuff, 256, 
                TEXT("Message %d: DBT_DEVICEREMOVECOMPLETE\n"), msgCount);
            break;
        case DBT_DEVNODES_CHANGED:
            msgCount++;
            StringCchPrintf(
                strBuff, 256, 
                TEXT("Message %d: DBT_DEVNODES_CHANGED\n"), msgCount);
            break;
        default:
            msgCount++;
            StringCchPrintf(
                strBuff, 256, 
                TEXT("Message %d: WM_DEVICECHANGE message received, value %d unhandled.\n"), 
                msgCount, wParam);
            break;
        }
        OutputMessage(hEditWnd, wParam, (LPARAM)strBuff);
    }
            break;
    case WM_CLOSE:
        if ( ! UnregisterDeviceNotification(hDeviceNotify) )
        {
           ErrorHandler(TEXT("UnregisterDeviceNotification")); 
        }
        DestroyWindow(hWnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        // Send all other messages on to the default windows handler.
        lRet = DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }
    return lRet;
}
#define WND_CLASS_NAME TEXT("SampleAppWindowClass")
//
// InitWindowClass
//
BOOL InitWindowClass()
// Routine Description:
//      Simple wrapper to initialize and register a window class.
// Parameters:
//     None
// Return Value:
//     TRUE on success, FALSE on failure.
// Note: 
//     wndClass.lpfnWndProc and wndClass.lpszClassName are the
//     important unique values used with CreateWindowEx and the
//     Windows message pump.
{
    WNDCLASSEX wndClass;
    wndClass.cbSize = sizeof(WNDCLASSEX);
    wndClass.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
    wndClass.hInstance = reinterpret_cast<HINSTANCE>(GetModuleHandle(0));
    wndClass.lpfnWndProc = reinterpret_cast<WNDPROC>(WinProcCallback);
    wndClass.cbClsExtra = 0;
    wndClass.cbWndExtra = 0;
    wndClass.hIcon = LoadIcon(0,IDI_APPLICATION);
    wndClass.hbrBackground = CreateSolidBrush(RGB(192,192,192));
    wndClass.hCursor = LoadCursor(0, IDC_ARROW);
    wndClass.lpszClassName = WND_CLASS_NAME;
    wndClass.lpszMenuName = NULL;
    wndClass.hIconSm = wndClass.hIcon;

    if ( ! RegisterClassEx(&wndClass) )
    {
        ErrorHandler(TEXT("RegisterClassEx"));
        return FALSE;
    }
    return TRUE;
}
//
// main
//
int __stdcall _tWinMain(
                      HINSTANCE hInstanceExe, 
                      HINSTANCE, // should not reference this parameter
                      PTSTR lpstrCmdLine, 
                      int nCmdShow
                      )
{
//
// To enable a console project to compile this code, set
// Project->Properties->Linker->System->Subsystem: Windows.
//
    int nArgC = 0;
    PWSTR* ppArgV = CommandLineToArgvW(lpstrCmdLine, &nArgC);
    g_pszAppName = ppArgV[0];
    if ( ! InitWindowClass() )
    {
        // InitWindowClass displays any errors
        return -1;
    }
    // Main app window
    HWND hWnd = CreateWindowEx(
                    WS_EX_CLIENTEDGE | WS_EX_APPWINDOW,
                    WND_CLASS_NAME,
                    g_pszAppName,
                    WS_OVERLAPPEDWINDOW, // style
                    CW_USEDEFAULT, 0, 
                    640, 480,
                    NULL, NULL, 
                    hInstanceExe, 
                    NULL);
    
    if ( hWnd == NULL )
    {
        ErrorHandler(TEXT("CreateWindowEx: main appwindow hWnd"));
        return -1;
    }
    // Actually draw the window.
    ShowWindow(hWnd, SW_SHOWNORMAL);
    UpdateWindow(hWnd);
    // The message pump loops until the window is destroyed.
    MessagePump(hWnd);
    return 1;
}
//
// OutputMessage
//
void OutputMessage(
    HWND hOutWnd, 
    WPARAM wParam, 
    LPARAM lParam
)
// Routine Description:
//     Support routine.
//     Send text to the output window, scrolling if necessary.
// Parameters:
//     hOutWnd - Handle to the output window.
//     wParam  - Standard windows message code, not used.
//     lParam  - String message to send to the window.
// Return Value:
//     None
// Note:
//     This routine assumes the output window is an edit control
//     with vertical scrolling enabled.
//     This routine has no error checking.
{
    LRESULT   lResult;
    LONG      bufferLen;
    LONG      numLines;
    LONG      firstVis;
  
    // Make writable and turn off redraw.
    lResult = SendMessage(hOutWnd, EM_SETREADONLY, FALSE, 0L);
    lResult = SendMessage(hOutWnd, WM_SETREDRAW, FALSE, 0L);
    // Obtain current text length in the window.
    bufferLen = SendMessage (hOutWnd, WM_GETTEXTLENGTH, 0, 0L);
    numLines = SendMessage (hOutWnd, EM_GETLINECOUNT, 0, 0L);
    firstVis = SendMessage (hOutWnd, EM_GETFIRSTVISIBLELINE, 0, 0L);
    lResult = SendMessage (hOutWnd, EM_SETSEL, bufferLen, bufferLen);
    // Write the new text.
    lResult = SendMessage (hOutWnd, EM_REPLACESEL, 0, lParam);
    // See whether scrolling is necessary.
    if (numLines > (firstVis + 1))
    {
        int        lineLen = 0;
        int        lineCount = 0;
        int        charPos;
        // Find the last nonblank line.
        numLines--;
        while(!lineLen)
        {
            charPos = SendMessage(
                hOutWnd, EM_LINEINDEX, (WPARAM)numLines, 0L);
            lineLen = SendMessage(
                hOutWnd, EM_LINELENGTH, charPos, 0L);
            if(!lineLen)
                numLines--;
        }
        // Prevent negative value finding min.
        lineCount = numLines - firstVis;
        lineCount = (lineCount >= 0) ? lineCount : 0;
        
        // Scroll the window.
        lResult = SendMessage(
            hOutWnd, EM_LINESCROLL, 0, (LPARAM)lineCount);
    }
    // Done, make read-only and allow redraw.
    lResult = SendMessage(hOutWnd, WM_SETREDRAW, TRUE, 0L);
    lResult = SendMessage(hOutWnd, EM_SETREADONLY, TRUE, 0L);
} 
//
// ErrorHandler
//
void ErrorHandler(
   LPTSTR lpszFunction
) 
// Routine Description:
//     Support routine.
//     Retrieve the system error message for the last-error code
//     and pop a modal alert box with usable info.
// Parameters:
//     lpszFunction - String containing the function name where 
//     the error occurred plus any other relevant data you'd 
//     like to appear in the output.
// Return Value:
//     None
// Note:
//     This routine is independent of the other windowing routines
//     in this application and can be used in a regular console
//     application without modification.
{
    LPVOID lpMsgBuf;
    LPVOID lpDisplayBuf;
    DWORD dw = GetLastError();
    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0, NULL );
    // Display the error message and exit the process.
    lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, 
        (lstrlen((LPCTSTR)lpMsgBuf)
                  + lstrlen((LPCTSTR)lpszFunction)+40)
                  * sizeof(TCHAR)); 
    StringCchPrintf((LPTSTR)lpDisplayBuf, 
        LocalSize(lpDisplayBuf) / sizeof(TCHAR),
        TEXT("%s failed with error %d: %s"), 
        lpszFunction, dw, lpMsgBuf); 
    MessageBox(NULL, (LPCTSTR)lpDisplayBuf, g_pszAppName, MB_OK);
    LocalFree(lpMsgBuf);
    LocalFree(lpDisplayBuf);
}

上面的代码改编自 MSDN :http://msdn.microsoft.com/en-us/library/windows/desktop/aa363432(v=vs.85).aspx

运行结果

此外，本文还参考了如下文章

http://blog.csdn.net/daoxwj/article/details/8819784
http://www.codeproject.com/Articles/14500/Detecting-Hardware-Insertion-and-or-Removal

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