private string CheckDevice(InteropDevices.SP_DEVICE_INTERFACE_DATA deviceInterfaceData, IntPtr deviceInfoSet, out IntPtr deviceDetailData, string vendorId, string productId)
{
var requiredBufferSize = -1;
// get the required size for the buffer
InteropSetupAPI.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData, IntPtr.Zero,
0, ref requiredBufferSize, IntPtr.Zero);
// allocate memory using the required size
deviceDetailData = Marshal.AllocHGlobal(requiredBufferSize);
// store cbSize in the first bytes of the array, with size based on 32 or 64 bit system
Marshal.WriteInt32(deviceDetailData, (IntPtr.Size == 4) ? (4 + Marshal.SystemDefaultCharSize) : 8);
// now we've allocated the buffer, pass it in to retrieve the information
if (InteropSetupAPI.SetupDiGetDeviceInterfaceDetail(deviceInfoSet, ref deviceInterfaceData,
deviceDetailData, requiredBufferSize, ref requiredBufferSize,
IntPtr.Zero))
{
// ignore cbSize
var pDevicePath = new IntPtr(deviceDetailData.ToInt32() + 4);
// retrieve the path name
var devicePathName = Marshal.PtrToStringAuto(pDevicePath);
// append underscore to we match the correct thing
var vendorIdString = ("vid_" + vendorId).ToLower();
var productIdString = ("pid_" + productId).ToLower();
if (devicePathName != null &&
devicePathName.Contains(vendorIdString) &&
devicePathName.Contains(productIdString))
{
return devicePathName;
}
}
// not our guy, bring out the next
return null;
}
public static extern Boolean SetupDiGetDeviceInterfaceDetail(IntPtr DeviceInfoSet, ref InteropDevices.SP_DEVICE_INTERFACE_DATA DeviceInterfaceData, IntPtr DeviceInterfaceDetailData, Int32 DeviceInterfaceDetailDataSize, ref Int32 RequiredSize, IntPtr DeviceInfoData);
public static extern Boolean SetupDiEnumDeviceInterfaces(IntPtr DeviceInfoSet, IntPtr DeviceInfoData, ref System.Guid InterfaceClassGuid, Int32 MemberIndex, ref InteropDevices.SP_DEVICE_INTERFACE_DATA DeviceInterfaceData);
