我正在尝试通过 HID 连接到 Unity3D 中的 Wiimote。
当我调用CreateFile()（来自 kernel32）时，会返回一个“有效”指针，我什至可以通过HidD_GetPreparsedDataand获得 Wiimote 的功能HidP_GetCaps。缓冲区大小等被返回，并且是我期望的大小。但是，当我尝试FileStream在句柄上打开 a 时，会出现“无效句柄”错误。
如果可以的话，这个句柄怎么会在这里无效GetCaps？Marshal32.GetLastWinError()也返回 0。
相关代码：
int i = 0;
foreach (string devPath in devicePaths)
{
Debug.Log(i);
i++;
if (devPath.Contains(VID_NINTENDO))
if (devPath.Contains(PID_WIIMOTE)) // ADD OTHER PID (IF EVER FOUND)
{
try
{
IntPtr dev_Handle = CreateFile(devPath, FileAccess.Read | FileAccess.Write, FileShare.Read | FileShare.Write, IntPtr.Zero, FileMode.Open, FILE_FLAG_OVERLAPPED, IntPtr.Zero); // Gives a "Valid" pointer
IntPtr device_data = IntPtr.Zero;
int inputLength = 0;
try
{
if (!HidD_GetPreparsedData(dev_Handle, out device_data))
{
throw new HIDException("Unable to get Preparsed data from device");
}
HidCaps device_capabilities; // Struct to contain inputlength etc.
HidP_GetCaps(device_data, out device_capabilities);
inputLength = device_capabilities.InputReportByteLength;
int outputLength = device_capabilities.OutputReportByteLength;
FileStream stream = new FileStream(dev_Handle, FileAccess.Read | FileAccess.Write, true, inputLength); // INVALID HANDLE
//FileStream stream = new FileStream(new SafeFileHandle(dev_Handle, false), FileAccess.Read | FileAccess.Write, inputLength, true); // Invalid Handle
//FileStream stream = new FileStream(dev_Handle, FileAccess.Read | FileAccess.Write, true, inputLength); // Invalid Handle
//FileStream stream = new FileStream(devPath, FileMode.Open, FileAccess.Read | FileAccess.Write, FileShare.Read | FileShare.Write, inputLength); // nullref (The file isnt being created in this path)
Debug.Log(dev_Handle);
}
catch (Exception e)
{
HandleException(e, "HIDException");
}
finally
{
HidD_FreePreparsedData(ref device_data);
}
}
catch (Exception e)
{
HandleException(e, "HIDException");
}
}
}
此外，在常规 C# 项目中，它可以正常工作:(（尽管我确实必须在 FileStream 构造函数中设置 useAsync = true （Invalid Handle尽管仍在 Unity 中）