hidapi HIDP_CAPS

HIDAPI (Human Interface Device API) 是一个跨平台的库，用于与各种类型的USB Human Interface Devices (HIDs)进行交互，如键盘、鼠标、游戏控制器等。HIDP_CAPS 是 HIDAPI 中的一个结构体，它包含了关于特定HID设备的能力描述符（Capabilities）信息。

HIDP_CAPS 结构通常包含以下字段：
1. **bLength**：结构体长度，固定为 sizeof(HIDP_CAPS)。
2. **bcdHID**：设备支持的HID规范版本。
3. **bCountryCode**：ISO 3166-1 alpha-2国家代码，用于描述报告格式的语言区域。
4. **bmCapabilities**：位掩码，指示设备支持的功能，比如报告集的数量、输入报告的最大长度等。
5. **bNumInputReports**：设备能接收的最大输入报告数。
6. **wMaxInputReportSize**：输入报告的最大字节数。
7. **bNumOutputReports**：设备能发送的最大输出报告数。
8. **wMaxOutputReportSize**：输出报告的最大字节数。
9. **bNumFeatureReports**：设备能使用的特征报告数。
10. **wMaxFeatureReportSize**：特征报告的最大字节数。

通过解析这个结构，开发者可以了解设备的具体特性，以便适当地配置和处理数据。

相关问题

HIDP_CAPS结构体

HIDP_CAPS（Human Interface Device Protocol Capabilities）是一个用于Windows Human Interface Device (HID) 设备驱动程序的结构体，它包含了关于设备功能、报告格式、输入报告大小等重要信息。这个结构体在hidpi.h头文件中定义，通常由硬件供应商提供，以便系统能够识别并配置HID设备。

HIDP_CAPS包含以下几个关键部分：
1. bcdDeviceClass：设备类别，如键盘、鼠标、游戏控制器等。
2. wNumInputBuffers：可用输入缓冲区的数量。
3. cMaxInputReports：最大支持的输入报告数。
4. rghidUsagePages：一系列用于描述设备输入用途的 Usage Page 数组。
5. rgbwDataIndices：用于快速查找特定数据项的索引数组。

通过解析HIDP_CAPS，操作系统可以确定如何与HID设备交互，并提供相应的驱动程序支持。

vb上位机usb hid

USB HID（人机接口设备）是一种用于在计算机和外部设备之间进行通信的协议。在VB上位机中使用USB HID需要使用一些特定的API函数来与USB设备进行通信。以下是一些参考步骤：

1. 使用Windows API函数创建HID设备的句柄。
2. 使用设备句柄读取和写入数据。
3. 使用设备句柄关闭HID设备。

下面是一个简单的示例代码，可用于读取HID设备的数据：

Private Declare Function HidD_GetHidGuid Lib "hid.dll" (ByRef HidGuid As Byte) As Long
Private Declare Function HidD_GetPreparsedData Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef PreparsedData As Long) As Long
Private Declare Function HidP_GetCaps Lib "hid.dll" (ByVal PreparsedData As Long, ByRef Capabilities As HIDP_CAPS) As Long
Private Declare Function HidD_FreePreparsedData Lib "hid.dll" (ByRef PreparsedData As Long) As Long
Private Declare Function HidD_GetAttributes Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef Attributes As HIDD_ATTRIBUTES) As Long
Private Declare Function HidD_GetSerialNumberString Lib "hid.dll" (ByVal HidDeviceObject As Long, ByVal Buffer As String, ByVal BufferLength As Long) As Long
Private Declare Function HidD_GetManufacturerString Lib "hid.dll" (ByVal HidDeviceObject As Long, ByVal Buffer As String, ByVal BufferLength As Long) As Long
Private Declare Function HidD_GetProductString Lib "hid.dll" (ByVal HidDeviceObject As Long, ByVal Buffer As String, ByVal BufferLength As Long) As Long
Private Declare Function HidD_SetFeature Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef ReportBuffer As Byte, ByVal ReportBufferLength As Long) As Long
Private Declare Function HidD_GetFeature Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef ReportBuffer As Byte, ByVal ReportBufferLength As Long) As Long
Private Declare Function HidD_GetNumInputBuffers Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef NumberBuffers As Long) As Long
Private Declare Function HidD_SetNumInputBuffers Lib "hid.dll" (ByVal HidDeviceObject As Long, ByVal NumberBuffers As Long) As Long
Private Declare Function HidD_GetInputReport Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef ReportBuffer As Byte, ByVal ReportBufferLength As Long) As Long
Private Declare Function HidD_SetOutputReport Lib "hid.dll" (ByVal HidDeviceObject As Long, ByRef ReportBuffer As Byte, ByVal ReportBufferLength As Long) As Long
Private Declare Function HidD_GetIndexedString Lib "hid.dll" (ByVal HidDeviceObject As Long, ByVal StringIndex As Long, ByVal Buffer As String, ByVal BufferLength As Long) As Long

Private Const HIDP_STATUS_SUCCESS = &H0
Private Const HIDP_CAPS = &H14
Private Const HIDP_INPUT_REPORT = &H1
Private Const HIDP_OUTPUT_REPORT = &H2

Private Type HIDP_CAPS
    Usage As Integer
    UsagePage As Integer
    InputReportByteLength As Integer
    OutputReportByteLength As Integer
    FeatureReportByteLength As Integer
    Reserved(21) As Integer
    NumberLinkCollectionNodes As Integer
    NumberInputButtonCaps As Integer
    NumberInputValueCaps As Integer
    NumberInputDataIndices As Integer
    NumberOutputButtonCaps As Integer
    NumberOutputValueCaps As Integer
    NumberOutputDataIndices As Integer
    NumberFeatureButtonCaps As Integer
    NumberFeatureValueCaps As Integer
    NumberFeatureDataIndices As Integer
End Type

Private Type HIDD_ATTRIBUTES
    Size As Long
    VendorID As Integer
    ProductID As Integer
    VersionNumber As Integer
End Type

Private Sub ReadHIDDevice()
    Dim HidDeviceObject As Long
    Dim PreparsedData As Long
    Dim Capabilities As HIDP_CAPS
    Dim Attributes As HIDD_ATTRIBUTES
    Dim ReportBuffer(1023) As Byte
    Dim ReportBufferLength As Long
    Dim Result As Long
    
    '获取HID设备的GUID
    Dim HidGuid(15) As Byte
    Result = HidD_GetHidGuid(HidGuid(0))
    
    '打开HID设备的句柄
    HidDeviceObject = CreateFile("\\.\HID#VID_XXXX&PID_XXXX#7&XXXXXXX&0&0000#{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0)
    
    '获取HID设备的属性
    Result = HidD_GetAttributes(HidDeviceObject, Attributes)
    
    '获取HID设备的预处理数据
    Result = HidD_GetPreparsedData(HidDeviceObject, PreparsedData)
    
    '获取HID设备的能力
    Result = HidP_GetCaps(PreparsedData, Capabilities)
    
    '读取输入报告
    ReportBufferLength = Capabilities.InputReportByteLength
    ReDim ReportBuffer(ReportBufferLength - 1)
    Result = HidD_GetInputReport(HidDeviceObject, ReportBuffer(0), ReportBufferLength)
    
    '关闭HID设备的句柄
    CloseHandle(HidDeviceObject)
End Sub

请注意，代码中的HID设备GUID、文件路径、VendorID和ProductID需要根据实际情况进行更改。