Question

我试图通过尝试读写HID来更改键盘LED的颜色。到目前为止，write方法可以正常工作，并且我能够成功更改键盘颜色，但是，每当我尝试从中读取键盘颜色以获取设备状态时，它将引发错误代码87，并且DeviceIOControl方法返回false。我实际上是通过PInvoke使用Kernel32.dll的方法，并且此代码对于在C ++中进行读写都可以正常工作，但是我似乎无法在C＃中读取它。

 [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern SafeFileHandle CreateFile(
             string lpFileName,
             uint dwDesiredAccess,
             uint dwShareMode,
             IntPtr lpSecurityAttributes,
             uint dwCreationDisposition,
       uint dwFlagsAndAttributes,
             IntPtr hTemplateFile
         );

        [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern bool DeviceIoControl(
               SafeFileHandle hDevice,
               uint IoControlCode,
               [MarshalAs(UnmanagedType.AsAny)]
               [In] object InBuffer,
               uint nInBufferSize,
        [MarshalAs(UnmanagedType.AsAny)]
        [Out] object OutBuffer,
        uint nOutBufferSize,
        ref uint pBytesReturned,
        [In] IntPtr Overlapped
);

public void initialize(){
 devHandle = CreateFile(path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
                    if (devHandle == null) {
                        isInitialized = false;
                        return false;
                    }
                    isInitialized = true;
                    return true;

}

public void deviceStatus()
    {
        uint writtenByteLength = 0;
        byte[] Buffer = { 0x02, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

        bool write = DeviceIoControl(devHandle, 0xb0195, Buffer, (uint)Buffer.Length, IntPtr.Zero, 0, ref writtenByteLength, IntPtr.Zero); //Write method works
        Buffer[0] = 0x01;


        bool read = DeviceIoControl(devHandle, 0xb01a2, null, 0, Buffer, (uint)Buffer.Length, ref writtenByteLength, IntPtr.Zero); //This returns false and does not work

        if (!read) {
            Global.logger.Info("Error Code: " + Marshal.GetLastWin32Error());
        }
        Global.logger.Info("Read Status: " + write + ": " + read);
        Global.logger.Info("Read Bytes: " + Buffer[0] + ": " + Buffer[1]);

    }

由于此代码在C ++中可以正常工作，所以我不知道为什么它返回错误87，这是C＃中不正确的参数。因为使用相同的PInvoke可以很好地实现写入方法，所以我能够更改键盘LED的颜色。我尝试过进行从byte []到IntPtr的元帅转换，并将byte []作为IntPtr传递，但这似乎也不起作用。任何帮助将非常感激。谢谢！

尝试从HID读取时，DeviceIOControl返回错误87

0 个答案: