如何获取设备管理器中设备的名字？

[lyae]

请教大侠：

1. 我知道设备的名字，想在程序中判断当前设备管理器中有没有这个设备，要怎么做呢？
2. 还有就是程序要如何知道USB设备插入PC或拔出PC呢？有什么消息吗？

[用户 昵称]

usb设备可以响应WM_DEVICECHANGE消息。

[shulei521]

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[cnzdgs]

1、用CreateFile打开设备，文件名给"\\.\设备路径及名称"，成功则存在。
2、WM_DEVICECHANGE消息。

[lyae]

TO jennyvenus : 我的硬件在PC中有二种模式，一种显示三个设备，一种显示二个设备，我想判断期中某种设备是否存在。我知道设备的名字，有没办法查询到？ 二种模式都有WM_DEVICECHANGE消息的，所以这个消息帮不上忙。

TO cnzdgs： 用Createfile打开设备能详细讲一下吗？ 文件名怎么设？我试了一下没成功。我只知道从“设备管理器”可以看到的名字。

[用户 昵称]

抄点现成的，不知道管不管用

.h

// DeviceEnumeratorDlg.h : header file
//

#if !defined(AFX_DEVICEENUMERATORDLG_H__6A28E8D3_F1D4_44F2_9040_103D484ABD57__INCLUDED_)
#define AFX_DEVICEENUMERATORDLG_H__6A28E8D3_F1D4_44F2_9040_103D484ABD57__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <winioctl.h>

/////////////////////////////////////////////////////////////////////////////
// CDeviceEnumeratorDlg dialog

class CDeviceEnumeratorDlg : public CDialog
{
// Construction
public:
	CDeviceEnumeratorDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	//{{AFX_DATA(CDeviceEnumeratorDlg)
	enum { IDD = IDD_DEVICEENUMERATOR_DIALOG };
		// NOTE: the ClassWizard will add data members here
	//}}AFX_DATA

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

// Implementation
protected:
	HICON m_hIcon;

	// Generated message map functions
	//{{AFX_MSG(CDeviceEnumeratorDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	virtual void OnOK();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()

private:
	BOOL GetDriveGeometry(const char* filename, DISK_GEOMETRY *pdg);
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_DEVICEENUMERATORDLG_H__6A28E8D3_F1D4_44F2_9040_103D484ABD57__INCLUDED_)

[用户 昵称]

.cpp

// DeviceEnumeratorDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DeviceEnumerator.h"
#include "DeviceEnumeratorDlg.h"

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


#define MEDIA_INFO_SIZE    sizeof(GET_MEDIA_TYPES)+15*sizeof(DEVICE_MEDIA_INFO)

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

/////////////////////////////////////////////////////////////////////////////
// CDeviceEnumeratorDlg dialog

CDeviceEnumeratorDlg::CDeviceEnumeratorDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDeviceEnumeratorDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDeviceEnumeratorDlg)
		// 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 CDeviceEnumeratorDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDeviceEnumeratorDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDeviceEnumeratorDlg, CDialog)
	//{{AFX_MSG_MAP(CDeviceEnumeratorDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDeviceEnumeratorDlg message handlers

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

void CDeviceEnumeratorDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	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 CDeviceEnumeratorDlg::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 CDeviceEnumeratorDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CDeviceEnumeratorDlg::OnOK() 
{
	   const char *szDevName[]=
	   {
			"\\\\.\\A:",
			"\\\\.\\B:",
			"\\\\.\\PhysicalDrive0",
			"\\\\.\\PhysicalDrive1",
			"\\\\.\\PhysicalDrive2",
			"\\\\.\\PhysicalDrive3",
			"\\\\.\\PhysicalDrive4",
			"\\\\.\\PhysicalDrive5",
			"\\\\.\\PhysicalDrive6",
			"\\\\.\\Cdrom0",
			"\\\\.\\Cdrom1",
	   };

	   DISK_GEOMETRY dg;
	   ULONGLONG DiskSize;
	   BOOL bResult;
	   CString strMsg;
	   CString strTmp;
	   
	   for (int i = 0; i < sizeof(szDevName)/sizeof(char*); i++)
	   {
		   bResult = GetDriveGeometry(szDevName[i], &dg);
		   
		   strTmp.Format("\r\n%s  result = %s\r\n", szDevName[i], bResult ? "success" : "failure");
		   strMsg+=strTmp;
		   
		   if (!bResult) continue;
		   
		   strTmp.Format("    Media Type = %d\r\n", dg.MediaType);
		   strMsg+=strTmp;
		   
		   strTmp.Format("    Cylinders = %I64d\r\n", dg.Cylinders);
		   strMsg+=strTmp;
		   
		   strTmp.Format("    Tracks per cylinder = %ld\r\n", (ULONG) dg.TracksPerCylinder);
		   strMsg+=strTmp;
		   
		   strTmp.Format("    Sectors per track = %ld\r\n", (ULONG) dg.SectorsPerTrack);
		   strMsg+=strTmp;
		   
		   strTmp.Format("    Bytes per sector = %ld\r\n", (ULONG) dg.BytesPerSector);
		   strMsg+=strTmp;
		   
		   DiskSize = dg.Cylinders.QuadPart * (ULONG)dg.TracksPerCylinder *
			   (ULONG)dg.SectorsPerTrack * (ULONG)dg.BytesPerSector;
		   strTmp.Format("    Disk size = %I64d (Bytes) = %I64d (Mb)\r\n", DiskSize, DiskSize / (1024 * 1024));
		   strMsg+=strTmp;
	   }
	   
	   AfxMessageBox(strMsg);
}

BOOL CDeviceEnumeratorDlg::GetDriveGeometry(const char* filename, DISK_GEOMETRY *pdg)
{
	HANDLE hDevice;         // 设备句柄
    BOOL bResult;           // DeviceIoControl的返回结果
    GET_MEDIA_TYPES *pmt;   // 内部用的输出缓冲区
    DWORD dwOutBytes;       // 输出数据长度
	
    // 打开设备
    hDevice = ::CreateFile(filename,           // 文件名
        GENERIC_READ,                          // 软驱需要读盘
        FILE_SHARE_READ | FILE_SHARE_WRITE,    // 共享方式
        NULL,                                  // 默认的安全描述符
        OPEN_EXISTING,                         // 创建方式
        0,                                     // 不需设置文件属性
        NULL);                                 // 不需参照模板文件
	
    if (hDevice == INVALID_HANDLE_VALUE)
    {
        // 设备无法打开...
        return FALSE;
    }
	
    // 用IOCTL_DISK_GET_DRIVE_GEOMETRY取磁盘参数
    bResult = ::DeviceIoControl(hDevice,       // 设备句柄
        IOCTL_DISK_GET_DRIVE_GEOMETRY,         // 取磁盘参数
        NULL, 0,                               // 不需要输入数据
        pdg, sizeof(DISK_GEOMETRY),            // 输出数据缓冲区
        &dwOutBytes,                           // 输出数据长度
        (LPOVERLAPPED)NULL);                   // 用同步I/O
	
    // 如果失败，再用IOCTL_STORAGE_GET_MEDIA_TYPES_EX取介质类型参数
    if (!bResult)
    {
        pmt = (GET_MEDIA_TYPES *)new BYTE[MEDIA_INFO_SIZE];
		
        bResult = ::DeviceIoControl(hDevice,    // 设备句柄
            IOCTL_STORAGE_GET_MEDIA_TYPES_EX,   // 取介质类型参数
            NULL, 0,                            // 不需要输入数据
            pmt, MEDIA_INFO_SIZE,               // 输出数据缓冲区
            &dwOutBytes,                        // 输出数据长度
            (LPOVERLAPPED)NULL);                // 用同步I/O
		
        if (bResult)
        {
            // 注意到结构DEVICE_MEDIA_INFO是在结构DISK_GEOMETRY的基础上扩充的
            // 为简化程序，用memcpy代替如下多条赋值语句：
            // pdg->MediaType = (MEDIA_TYPE)pmt->MediaInfo[0].DeviceSpecific.DiskInfo.MediaType;
            // pdg->Cylinders = pmt->MediaInfo[0].DeviceSpecific.DiskInfo.Cylinders;
            // pdg->TracksPerCylinder = pmt->MediaInfo[0].DeviceSpecific.DiskInfo.TracksPerCylinder;
            // ... ...
            ::memcpy(pdg, pmt->MediaInfo, sizeof(DISK_GEOMETRY));
        }
		
        delete pmt;
    }
	
    // 关闭设备句柄
    ::CloseHandle(hDevice);
	
    return (bResult);
}

[taianmonkey]

写一个存储设备过滤驱动可以获取到！

[knowledge_Is_Life]

有问题请先GOOGLE,BAIDU