public static unsafe void EnumerateDevices <TContext> (
string machine, DiGetClassFlags flags,
string[] deviceClassNames, EnumerateDevicesFunc <TContext> callback,
TContext context
) where TContext : class
{
DeviceInfoListHandle devs = null;
var devInfo = new SP_DEVINFO_DATA();
var devInfoListDetail = new SP_DEVINFO_LIST_DETAIL_DATA();
Guid[] deviceClassGuids;
try {
int numClasses = 0;
if (deviceClassNames != null)
{
deviceClassGuids = new Guid[deviceClassNames.Length];
foreach (var className in deviceClassNames)
{
UInt32 numResults;
if (
!SetupDiClassGuidsFromNameEx(
className, out deviceClassGuids[numClasses],
1, out numResults,
machine, IntPtr.Zero
) && (Marshal.GetLastWin32Error() != ERROR_INSUFFICIENT_BUFFER)
)
{
throw new Exception("Unable to resolve class name '" + className + "'");
}
numClasses += 1;
}
var newClassGuids = new Guid[numClasses];
Array.Copy(deviceClassGuids, newClassGuids, numClasses);
deviceClassGuids = newClassGuids;
}
else
{
deviceClassGuids = new Guid[0];
}
if (deviceClassGuids.Length > 0)
{
for (int i = 0; i < deviceClassGuids.Length; i++)
{
fixed(Guid *pGuid = &(deviceClassGuids[i]))
{
var existingPtr = IntPtr.Zero;
if (devs != null)
{
existingPtr = devs.DangerousGetHandle();
}
var result = SetupDiGetClassDevsEx(
new IntPtr(pGuid), null, IntPtr.Zero, flags,
existingPtr, machine, IntPtr.Zero
);
var lastError = Marshal.GetLastWin32Error();
if (lastError != 0)
{
throw new Win32Exception(lastError);
}
if (devs == null)
{
devs = new DeviceInfoListHandle(result, true);
}
}
}
}
else
{
devs = new DeviceInfoListHandle(
SetupDiGetClassDevsEx(
IntPtr.Zero, null, IntPtr.Zero,
flags | DiGetClassFlags.DIGCF_ALLCLASSES,
IntPtr.Zero, machine, IntPtr.Zero
), true
);
var lastError = Marshal.GetLastWin32Error();
if (lastError != 0)
{
throw new Win32Exception(lastError);
}
}
if (devs.IsInvalid)
{
throw new Exception("Failed to create device info list");
}
devInfoListDetail.cbSize = (UInt32)Marshal.SizeOf(devInfoListDetail.GetType());
if (!SetupDiGetDeviceInfoListDetail(devs.DangerousGetHandle(), ref devInfoListDetail))
{
var lastError = Marshal.GetLastWin32Error();
if (lastError != 0)
{
throw new Win32Exception(lastError);
}
return;
}
devInfo.cbSize = (UInt32)Marshal.SizeOf(devInfo.GetType());
for (UInt32 devIndex = 0; SetupDiEnumDeviceInfo(devs.DangerousGetHandle(), devIndex, ref devInfo); devIndex++)
{
callback(devs, ref devInfo, GetDeviceId(ref devInfo), context);
}
{
var lastError = Marshal.GetLastWin32Error();
if ((lastError != 0) && (lastError != ERROR_NO_MORE_ITEMS))
{
throw new Win32Exception(lastError);
}
}
} finally {
if (devs != null && !devs.IsClosed)
{
devs.Close();
}
}
}
public static extern bool SetupDiGetDeviceInfoListDetail(IntPtr DeviceInfoSet, ref SP_DEVINFO_LIST_DETAIL_DATA DeviceInfoSetDetailData);
public static extern bool SetupDiGetDeviceInfoListDetail(
IntPtr deviceInfoSet, ref SP_DEVINFO_LIST_DETAIL_DATA output
);
