如何在C＃或C ++上从USB设备描述符（设备不是硬盘驱动器，它是像耳机这样的外部设备）获取产品字符串？我需要得到我的耳机＆＃34;字符串。
======================== USB Device ========================
+++++++++++++++++ Device Information ++++++++++++++++++
Device Description : USB Composite Device
Device Path : \\?\usb#vid_2ae2&pid_1388#abcdef0123456789#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Device ID : USB\VID_2AE2&PID_1388\ABCDEF0123456789
Driver KeyName : {36fc9e60-c465-11cf-8056-444553540000}\0018 (GUID_DEVCLASS_USB)
Driver : C:\Windows\System32\drivers\usbccgp.sys (Version: 6.3.9600.17238 Date: 2014-07-24)
Driver Inf : C:\Windows\inf\usb.inf
Legacy BusType : PNPBus
Class : USB
Service : usbccgp
Enumerator : USB
Location Info : Port_#0006.Hub_#0003
Location IDs : PCIROOT(0)#PCI(1400)#USBROOT(0)#USB(6), ACPI(_SB_)#ACPI(PCI0)#ACPI(XHC_)#ACPI(RHUB)#ACPI(HS06)
Container ID : {acb9ebb8-b976-57c5-b90d-5ecc5e96e487}
Manufacturer Info : (Standard USB Host Controller)
Capabilities : 0x94 (Removable, UniqueID, SurpriseRemovalOK)
Address : 6
Problem Code : 0
Power State : D0 (supported: D0, D3, wake from D0)
Child Device 1 : USB Input Device
Device ID : USB\VID_2AE2&PID_1388&MI_03\6&12E75DA&0&0003
Class : HIDClass
Child Device 1 : HID-compliant consumer control device
Device ID : HID\VID_2AE2&PID_1388&MI_03\7&178A021A&0&0000
Class : HIDClass
Child Device 2 : USB Audio Device
Device ID : USB\VID_2AE2&PID_1388&MI_00\6&12E75DA&0&0000
Class : MEDIA
Child Device 1 : Audio Endpoint
Device ID : SWD\MMDEVAPI\{0.0.1.00000000}.{0B0B6598-290C-495B-A4E1-D6A633F61574}
Class : AudioEndpoint
Child Device 2 : Audio Endpoint
Device ID : SWD\MMDEVAPI\{0.0.0.00000000}.{E3ADC851-586E-4FF8-BBF3-0EBF7E72FBDA}
Class : AudioEndpoint
------------------ Device Descriptor ------------------
bLength : 0x12 (18 bytes)
bDescriptorType : 0x01 (Device Descriptor)
bcdUSB : 0x200 (USB Version 2.00)
bDeviceClass : 0x00 (defined by the interface descriptors)
bDeviceSubClass : 0x00
bDeviceProtocol : 0x00
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x2AE2
idProduct : 0x1388
bcdDevice : 0x1393
iManufacturer : 0x00 (No String Descriptor)
iProduct : 0x02 (String Descriptor 2)
Language 0x0409 : "My Headset"
iSerialNumber : 0x03 (String Descriptor 3)
Language 0x0409 : "ABCDEF0123456789"
bNumConfigurations : 0x01
目前我使用此代码示例获取产品字符串，我打开集线器并使用IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION调用DeviceIoControl以获取连接到此集线器的设备的产品字符串，但此代码有时会起作用，因为有时候某个集线器是由某人打开的else和CreateFile（hubPath ..）失败：
// Open Hub
IntPtr handle = CreateFile(hubPath, FileAccess.ReadWrite, FileShare.ReadWrite,
IntPtr.Zero, FileMode.Open, FileAttributes.Normal, IntPtr.Zero);
if (handle.ToInt32() != INVALID_HANDLE_VALUE)
{
// 1. Load connection properties to get Device descriptor indexes
LogWriter.Debug("checking device, load hub connection properties...");
USB_NODE_CONNECTION_INFORMATION_EX connectionInfo = new USB_NODE_CONNECTION_INFORMATION_EX();
connectionInfo.ConnectionIndex = port;
// memset
string NullString = new string((char)0, nBytes / Marshal.SystemDefaultCharSize);
IntPtr connectionInfoBuffer = Marshal.StringToHGlobalAuto(NullString);
Marshal.StructureToPtr(connectionInfo, connectionInfoBuffer, true);
int iProductIndex = -1;
int ioBytes = Marshal.SizeOf(connectionInfo);
int nBytesReturned = 0;
if (DeviceIoControl(handle,
IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
connectionInfoBuffer,
ioBytes,
connectionInfoBuffer,
ioBytes,
out nBytesReturned,
IntPtr.Zero) != 0)
{
LogWriter.Debug("checking device, hub connection properties loaded");
USB_NODE_CONNECTION_INFORMATION_EX nodeConnection = (USB_NODE_CONNECTION_INFORMATION_EX)Marshal.PtrToStructure(connectionInfoBuffer, typeof(USB_NODE_CONNECTION_INFORMATION_EX));
if (nodeConnection.DeviceIsHub == 0)
{
iProductIndex = nodeConnection.DeviceDescriptor.iProduct;
LogWriter.Debug(String.Format("GetDeviceProperties() Checking device, iProductIndex = {0}", iProductIndex));
}
}
else
{
CheckError("DeviceIoControl");
}
// 2. Load iProduct descriptor
USB_DESCRIPTOR_REQUEST stringDescReq = new USB_DESCRIPTOR_REQUEST();
int bufSize = Marshal.SizeOf(stringDescReq) + MAXIMUM_USB_STRING_LENGTH;
stringDescReq.ConnectionIndex = port;
stringDescReq.SetupPacket.wValue = (short)((USB_STRING_DESCRIPTOR_TYPE << 8) | iProductIndex);
stringDescReq.SetupPacket.wIndex = 1033; // Language code
stringDescReq.SetupPacket.wLength = (short)(bufSize - Marshal.SizeOf(stringDescReq));
// типа memset
IntPtr ptrRequest = Marshal.StringToHGlobalAuto(NullString);
Marshal.StructureToPtr(stringDescReq, ptrRequest, true);
int nBytesRet = 0;
LogWriter.Debug(String.Format("checking device, load USB descriptor({0}, {1}, {2})",
stringDescReq.SetupPacket.wValue,
stringDescReq.SetupPacket.wIndex,
stringDescReq.SetupPacket.wLength));
if (DeviceIoControl(handle,
IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
ptrRequest,
bufSize,
ptrRequest,
bufSize,
out nBytesRet,
IntPtr.Zero) != 0)
{
int ptrSize = ptrRequest.ToInt32();
LogWriter.Debug(String.Format("checking device, USB descriptor loaded({0}, {1})",
ptrSize,
Marshal.SizeOf(stringDescReq)));
IntPtr ptrStringDesc = new IntPtr(ptrSize + Marshal.SizeOf(stringDescReq));
USB_STRING_DESCRIPTOR StringDesc = (USB_STRING_DESCRIPTOR)Marshal.PtrToStructure(ptrStringDesc, typeof(USB_STRING_DESCRIPTOR));
prop.ProductName = StringDesc.bString;
if (prop.ProductName != null)
{
LogWriter.Debug("ProductName = " + prop.ProductName);
}
}
else
{
LogWriter.Warn("DeviceIoControl failed");
CheckError("DeviceIoControl");
}
CloseHandle(handle);
}
所以我需要其他方法来获得稳定运行的产品字符串。
一个注意事项：当前设备是HID，因此允许使用HID功能，但我也有非HID USB设备，如果解决方案可以同时使用HID和非HID，那将会很棒。我在一年前尝试过HidD_GetProductString例程，因为我记得它返回空缓冲区（问题可能是错误的设备路径，因为HID有子设备，在这种情况下问题是如何获得正确的设备路径）。
答案 0 :(得分：0)
HidD_GetProductString是HID设备的方法。您之前可能在每个其他字节上遇到\0。如果您使用HidLibrary并拥有HidDevice _device，则可以获得此类产品字符串（制造商的工作方式相同）：
byte[] bs;
_device.ReadProduct(out bs);
string ps = "";
foreach (byte b in bs) {
if (b > 0)
ps += ((char)b).ToString();
}