/// <summary>
/// Get all our usages, those are typically the buttons currently pushed on a gamepad.
/// For a remote control it's usually just the one button that was pushed.
/// </summary>
private void GetUsages(byte[] aInputReport)
{
//Do proper parsing of our HID report
//First query our usage count
uint usageCount = 0;
Win32.USAGE_AND_PAGE[] usages = null;
Win32.HidStatus status = Win32.Function.HidP_GetUsagesEx(Win32.HIDP_REPORT_TYPE.HidP_Input, 0, usages, ref usageCount, Device.PreParsedData, aInputReport, (uint)aInputReport.Length);
if (status == Win32.HidStatus.HIDP_STATUS_BUFFER_TOO_SMALL)
{
//Allocate a large enough buffer
usages = new Win32.USAGE_AND_PAGE[usageCount];
//...and fetch our usages
status = Win32.Function.HidP_GetUsagesEx(Win32.HIDP_REPORT_TYPE.HidP_Input, 0, usages, ref usageCount, Device.PreParsedData, aInputReport, (uint)aInputReport.Length);
if (status != Win32.HidStatus.HIDP_STATUS_SUCCESS)
{
Debug.WriteLine("Second pass could not parse HID data: " + status.ToString());
}
}
else if (status != Win32.HidStatus.HIDP_STATUS_SUCCESS)
{
Debug.WriteLine("First pass could not parse HID data: " + status.ToString());
}
Debug.WriteLine("Usage count: " + usageCount.ToString());
//Copy usages into this event
if (usages != null)
{
foreach (USAGE_AND_PAGE up in usages)
{
//Debug.WriteLine("UsagePage: 0x" + usages[0].UsagePage.ToString("X4"));
//Debug.WriteLine("Usage: 0x" + usages[0].Usage.ToString("X4"));
//Add this usage to our list
Usages.Add(up.Usage);
}
}
}
/// <summary>
/// Typically fetches values of a joystick/gamepad axis and dpad directions.
/// </summary>
/// <param name="aInputReport"></param>
private void GetUsageValues(byte[] aInputReport)
{
if (Device.InputValueCapabilities == null)
{
return;
}
foreach (HIDP_VALUE_CAPS caps in Device.InputValueCapabilities)
{
if (caps.IsRange)
{
//What should we do with those guys?
continue;
}
//Now fetch and add our usage value
uint usageValue = 0;
Win32.HidStatus status = Win32.Function.HidP_GetUsageValue(Win32.HIDP_REPORT_TYPE.HidP_Input, caps.UsagePage, caps.LinkCollection, caps.NotRange.Usage, ref usageValue, Device.PreParsedData, aInputReport, (uint)aInputReport.Length);
if (status == Win32.HidStatus.HIDP_STATUS_SUCCESS)
{
UsageValues[caps] = usageValue;
}
}
}