编辑
奇怪的是,我已经解决了这个问题,但它仍然让我很烦。我通过发送太长的写入来解决它,并填充零;该代码有效,但发送了几百个不必要的字节。具体来说,我需要准确发送 992 字节的数据包,而不是 7 或 19 字节的数据包。但是,我的问题仍然存在,为什么 Logitech 代码能够进行 7 或 19 字节的写入,而我却不能。
我遇到了一个问题,即特定代码块失败或成功显然取决于传递给它的数据的长度。这对我来说毫无意义;我显然做错了什么,但我不知道是什么。
我在三种情况下尝试使用以下代码块,它将字节流写入 USB 设备(两个罗技 G 系列键盘之一):
Friend Function WriteData(ByVal Keyboard As GSeriesKeyboard, ByVal Data() As Byte) As Integer
Dim BytesWritten As Integer = Data.Length
Dim Success As Boolean = Win32.WriteFile(Keyboard.ExternalIOHandle, Data, Data.Length, BytesWritten, Nothing)
Dim ErrorCode As Integer = GetLastError()
Return ErrorCode
End Function
<DllImport("kernel32.dll", SetlastError:=True)> Friend Shared Function WriteFile( _
ByVal File As SafeFileHandle, _
ByVal Buffer() As Byte, _
ByVal NumberOfBytesToWrite As Integer, _
ByRef NumberOfBytesWritten As Integer, _
ByRef Overlapped As System.Threading.NativeOverlapped) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function
在第一种情况下,我传递了一个 992 字节的流并且写入成功完成。在第二种和第三种情况下,我正在写入 7 个或 19 个字节,WriteFile 生成 7 个字节的错误 ERROR_INVALID_USER_BUFFER 或 19 个字节的 ERROR_INVALID_PARAMETER。我已经打开了读写手柄,不重叠。
使用 USBTrace 时,我可以看到默认的 Logitech 程序可以毫无问题地编写所有三种情况,但我自己的代码只能编写 992 字节的情况。无论我将代码编译为 x86 还是 x64,此行为都是相同的。
我用来打开句柄的代码是这样的:
Friend Function OpenInterface(ByVal KeyboardPath As String) As SafeFileHandle
Dim SecurityData As New SECURITY_ATTRIBUTES()
Dim security As New DirectorySecurity()
Dim DescriptorBinary As Byte() = security.GetSecurityDescriptorBinaryForm()
Dim SecurityDescriptorPtr As IntPtr = Marshal.AllocHGlobal(DescriptorBinary.Length)
SecurityData.nLength = Marshal.SizeOf(SecurityData)
Marshal.Copy(DescriptorBinary, 0, SecurityDescriptorPtr, DescriptorBinary.Length)
SecurityData.lpSecurityDescriptor = SecurityDescriptorPtr
Dim Handle As SafeFileHandle = Win32.CreateFile(KeyboardPath, GENERIC_READ Or GENERIC_WRITE, _
FILE_SHARE_READ Or FILE_SHARE_WRITE, SecurityData, _
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
If Handle.IsInvalid Then
Dim ErrorInfo As New ComponentModel.Win32Exception()
Debug.Print("Failed to get device IO handle: " & ErrorInfo.Message)
End If
Return Handle
End Function
Friend Overridable Function BitmapToLcdFormat(ByVal SourceBitmap As Bitmap) As Byte()
'Base class is for the generic B&W 160x43 LCD. Override for G19 if I ever get my hands on one
Dim Data As Byte() = New Byte(991) {}
' USBTrace says 992 bytes
Dim Image(640 * 48) As Byte 'Temp array for image conversion. Adds additional 5 lines of unused pixels to avoid an out-of-bounds error
Dim BitmapData As BitmapData = SourceBitmap.LockBits(New Rectangle(0, 0, 160, 43), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb)
Marshal.Copy(BitmapData.Scan0, Image, 0, (640 * 43))
Data(0) = &H3 'Set-LCD
Dim output As Integer = 32 'First byte of image data starts at byte 32; 960 bytes of image data
Dim ImageOffset As Integer = 0
For Row As Integer = 0 To 5
For Column As Integer = 0 To (SourceBitmap.Width << 2) - 1 Step 4
Dim r As Integer = _
((Image(ImageOffset + Column + BitmapData.Stride * 0) And &H80) >> 7) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 1) And &H80) >> 6) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 2) And &H80) >> 5) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 3) And &H80) >> 4) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 4) And &H80) >> 3) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 5) And &H80) >> 2) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 6) And &H80) >> 1) Or _
((Image(ImageOffset + Column + BitmapData.Stride * 7) And &H80) >> 0)
Data(output) = CByte(r)
output += 1
Next
ImageOffset += BitmapData.Stride * 8
Next
SourceBitmap.UnlockBits(BitmapData)
Return Data
End Function
调用 WriteData() 的确切代码块如下:
(Logitech G15)
HardwareInterface.WriteData(Me, New Byte() {2, 0, 0, 0, 0, 0, 0})
(Logitech G510)
HardwareInterface.WriteData(Me, New Byte() {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
(Both; the one that works)
HardwareInterface.WriteData(Me, BitmapToLcdFormat(NewImage)) 'Build 992-byte LCD-format bitmap from source iumage
这些特定命令用于将板上的宏(“G”)键重新映射到不同的字符代码,在这种情况下,00 禁用该键。任何拥有 G15/G19/G510 键盘的人都可以通过禁用罗技游戏面板软件并重新插入键盘来看到这一点。G3 将像记事本中的 F3 一样(查找下一个),但重新启动游戏面板软件后将不再这样做。