查找并提取设备 USB 基于它 VID/PID

好吧，我猜。 文章 CodeProject, 由舱口盖引用显示如何将驱动器号与设备界面匹配，即在那里，所以我会的 +1 这个答案，但它没有解决整个问题。

我需要了解如何为我的设备找到设备的实例 USB 并找到一种与设备接口匹配的方法。 功能 CM_Locate_DevNode// 和 CM_Get_Child// 是这个关键。 最后，我可以使用 IOCTL 提取设备。

我正在处理的设备是CD-ROM驱动器 USB, 因此，我刚性地编码了设备的类型 CDROM. 我无法相信需要多少代码来做我的想法是一个非常简单的任务 /我引用了我的客户 2 一个小时才能写这个代码，我需要四天来了解这一切！/. 这是最终的工作代码，我希望，它将拯救你们一个人，因为我只是：

#include <setupapi.h>

#include <cfgmgr32.h>

#include <winioctl.h>



// Finds the device interface for the CDROM drive with the given interface number.

DEVINST GetDrivesDevInstByDeviceNumber/long DeviceNumber/

{

 const GUID *guid = &amp;GUID_DEVINTERFACE_CDROM;



// Get device interface info set handle

// for all devices attached to system

 HDEVINFO hDevInfo = SetupDiGetClassDevs/guid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE/;

 if/hDevInfo == INVALID_HANDLE_VALUE/

 return 0;



// Retrieve a context structure for a device interface of a device information set.

 BYTE buf[1024];

 PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd = /PSP_DEVICE_INTERFACE_DETAIL_DATA/buf;

 SP_DEVICE_INTERFACE_DATA spdid;

 SP_DEVINFO_DATA spdd;

 DWORD dwSize;



 spdid.cbSize = sizeof/spdid/;



// Iterate through all the interfaces and try to match one based on

// the device number.

 for/DWORD i = 0; SetupDiEnumDeviceInterfaces/hDevInfo, NULL,guid, i, &amp;spdid/; i++/

 {

 // Get the device path.

 dwSize = 0;

 SetupDiGetDeviceInterfaceDetail/hDevInfo, &amp;spdid, NULL, 0, &amp;dwSize, NULL/;

 if/dwSize == 0 || dwSize &gt; sizeof/buf//

 continue;



 pspdidd-&gt;cbSize = sizeof/*pspdidd/;

 ZeroMemory//PVOID/&amp;spdd, sizeof/spdd//;

 spdd.cbSize = sizeof/spdd/;

 if/!SetupDiGetDeviceInterfaceDetail/hDevInfo, &amp;spdid, pspdidd,

 dwSize, &amp;dwSize, &amp;spdd//

 continue;



 // Open the device.

 HANDLE hDrive = CreateFile/pspdidd-&gt;DevicePath,0,

 FILE_SHARE_READ | FILE_SHARE_WRITE,

 NULL, OPEN_EXISTING, 0, NULL/;

 if/hDrive == INVALID_HANDLE_VALUE/

 continue;



 // Get the device number.

 STORAGE_DEVICE_NUMBER sdn;

 dwSize = 0;

 if/DeviceIoControl/hDrive,

 IOCTL_STORAGE_GET_DEVICE_NUMBER,

 NULL, 0, &amp;sdn, sizeof/sdn/,

 &amp;dwSize, NULL//

 {

 // Does it match?

 if/DeviceNumber == /long/sdn.DeviceNumber/

 {

 CloseHandle/hDrive/;

 SetupDiDestroyDeviceInfoList/hDevInfo/;

 return spdd.DevInst;

 }

 }

 CloseHandle/hDrive/;

 }



 SetupDiDestroyDeviceInfoList/hDevInfo/;

 return 0;

}





// Returns true if the given device instance belongs to the USB device with the given VID and PID.

bool matchDevInstToUsbDevice/DEVINST device, DWORD vid, DWORD pid/

{

// This is the string we will be searching for in the device harware IDs.

 TCHAR hwid[64];

 _stprintf/hwid, _T/"VID_X&amp;PID_X"/, vid, pid/;



// Get a list of hardware IDs for all USB devices.

 ULONG ulLen;

 CM_Get_Device_ID_List_Size/&amp;ulLen, NULL, CM_GETIDLIST_FILTER_NONE/;

 TCHAR *pszBuffer = new TCHAR[ulLen];

 CM_Get_Device_ID_List/NULL, pszBuffer, ulLen, CM_GETIDLIST_FILTER_NONE/;



// Iterate through the list looking for our ID.

 for/LPTSTR pszDeviceID = pszBuffer; *pszDeviceID; pszDeviceID += _tcslen/pszDeviceID/ + 1/

 {

 // Some versions of Windows have the string in upper case and other versions have it

 // in lower case so just make it all upper.

 for/int i = 0; pszDeviceID[i]; i++/

 pszDeviceID[i] = toupper/pszDeviceID[i]/;



 if/_tcsstr/pszDeviceID, hwid//

 {

 // Found the device, now we want the grandchild device, which is the "generic volume"

 DEVINST MSDInst = 0;

 if/CR_SUCCESS == CM_Locate_DevNode/&amp;MSDInst, pszDeviceID, CM_LOCATE_DEVNODE_NORMAL//

 {

 DEVINST DiskDriveInst = 0;

 if/CR_SUCCESS == CM_Get_Child/&amp;DiskDriveInst, MSDInst, 0//

 {

 // Now compare the grandchild node against the given device instance.

 if/device == DiskDriveInst/

 return true;

 }

 }

 }

 }



 return false;

}



// Eject the given drive.

void ejectDrive/TCHAR driveletter/

{

 TCHAR devicepath[16];

 _tcscpy/devicepath, _T/"\\\\.\\?:"//;

 devicepath[4] = driveletter;



 DWORD dwRet = 0;

 HANDLE hVol = CreateFile/devicepath, GENERIC_READ, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL/;

 if/hVol == INVALID_HANDLE_VALUE/

 return;



 if/!DeviceIoControl/hVol, FSCTL_LOCK_VOLUME, 0, 0, 0, 0, &amp;dwRet, 0//

 return;



 if/!DeviceIoControl/hVol, FSCTL_DISMOUNT_VOLUME, 0, 0, 0, 0, &amp;dwRet, 0//

 return;



 DeviceIoControl/hVol, IOCTL_STORAGE_EJECT_MEDIA, 0, 0, 0, 0, &amp;dwRet, 0/;



 CloseHandle/hVol/;

}



// Find a USB device by it's Vendor and Product IDs. When found, eject it.

void usbEjectDevice/unsigned vid, unsigned pid/

{

 TCHAR devicepath[8];

 _tcscpy/devicepath, _T/"\\\\.\\?:"//;



 TCHAR drivepath[4];

 _tcscpy/drivepath, _T/"?:\\"//;



// Iterate through every drive letter and check if it is our device.

 for/TCHAR driveletter = _T/'A'/; driveletter &lt;= _T/'Z'/; driveletter++/

 {

 // We are only interested in CDROM drives.

 drivepath[0] = driveletter;

 if/DRIVE_CDROM != GetDriveType/drivepath//

 continue;



 // Get the "storage device number" for the current drive.

 long DeviceNumber = -1;

 devicepath[4] = driveletter;

 HANDLE hVolume = CreateFile/devicepath, 0, FILE_SHARE_READ | FILE_SHARE_WRITE,

 NULL, OPEN_EXISTING, 0, NULL/;

 if/INVALID_HANDLE_VALUE == hVolume/

 continue;



 STORAGE_DEVICE_NUMBER sdn;

 DWORD dwBytesReturned = 0;

 if/DeviceIoControl/hVolume, IOCTL_STORAGE_GET_DEVICE_NUMBER,

 NULL, 0, &amp;sdn, sizeof/sdn/, &amp;dwBytesReturned, NULL//

 DeviceNumber = sdn.DeviceNumber;

 CloseHandle/hVolume/;

 if/DeviceNumber &lt; 0/

 continue;



 // Use the data we have collected so far on our drive to find a device instance.

 DEVINST DevInst = GetDrivesDevInstByDeviceNumber/DeviceNumber/;



 // If the device instance corresponds to the USB device we are looking for, eject it.

 if/DevInst/

 {

 if/matchDevInstToUsbDevice/DevInst, vid, pid//

 ejectDrive/driveletter/;

 } 

 }

}

</winioctl.h></cfgmgr32.h></setupapi.h>