internal static extern bool SetupDiEnumDeviceInfo(
IntPtr DeviceInfoSet,
uint MemberIndex,
ref NativeStructs.SP_DEVINFO_DATA DeviceInfoData);
internal static extern bool SetupDiGetDeviceInstanceIdW(
IntPtr DeviceInfoSet,
ref NativeStructs.SP_DEVINFO_DATA DeviceInfoData,
IntPtr DeviceInstanceId,
uint DeviceInstanceIdSize,
out uint RequiredSize);
private static string GetCpuName()
{
Guid processorClassGuid = new Guid("{50127DC3-0F36-415E-A6CC-4CB3BE910B65}");
IntPtr hDiSet = IntPtr.Zero;
string cpuName = null;
try
{
hDiSet = NativeMethods.SetupDiGetClassDevsW(ref processorClassGuid, null, IntPtr.Zero, NativeConstants.DIGCF_PRESENT);
if (hDiSet == NativeConstants.INVALID_HANDLE_VALUE)
{
NativeMethods.ThrowOnWin32Error("SetupDiGetClassDevsW returned INVALID_HANDLE_VALUE");
}
bool bResult = false;
uint memberIndex = 0;
while (true)
{
NativeStructs.SP_DEVINFO_DATA spDevinfoData = new NativeStructs.SP_DEVINFO_DATA();
spDevinfoData.cbSize = (uint)Marshal.SizeOf(typeof(NativeStructs.SP_DEVINFO_DATA));
bResult = NativeMethods.SetupDiEnumDeviceInfo(hDiSet, memberIndex, ref spDevinfoData);
if (!bResult)
{
int error = Marshal.GetLastWin32Error();
if (error == NativeConstants.ERROR_NO_MORE_ITEMS)
{
break;
}
else
{
throw new Win32Exception("SetupDiEnumDeviceInfo returned false, GetLastError() = " + error.ToString());
}
}
uint lengthReq = 0;
bResult = NativeMethods.SetupDiGetDeviceInstanceIdW(hDiSet, ref spDevinfoData, IntPtr.Zero, 0, out lengthReq);
if (bResult)
{
NativeMethods.ThrowOnWin32Error("SetupDiGetDeviceInstanceIdW(1) returned true");
}
if (lengthReq == 0)
{
NativeMethods.ThrowOnWin32Error("SetupDiGetDeviceInstanceIdW(1) returned false, but also 0 for lengthReq");
}
IntPtr str = IntPtr.Zero;
string regPath = null;
try
{
// Note: We cannot use Memory.Allocate() here because this property is
// usually retrieved during app shutdown, during which the heap may not
// be available.
str = Marshal.AllocHGlobal(checked ((int)(sizeof(char) * (1 + lengthReq))));
bResult = NativeMethods.SetupDiGetDeviceInstanceIdW(hDiSet, ref spDevinfoData, str, lengthReq, out lengthReq);
if (!bResult)
{
NativeMethods.ThrowOnWin32Error("SetupDiGetDeviceInstanceIdW(2) returned false");
}
regPath = Marshal.PtrToStringUni(str);
}
finally
{
if (str != IntPtr.Zero)
{
Marshal.FreeHGlobal(str);
str = IntPtr.Zero;
}
}
string keyName = @"SYSTEM\CurrentControlSet\Enum\" + regPath;
using (RegistryKey procKey = Registry.LocalMachine.OpenSubKey(keyName, false))
{
const string friendlyName = "FriendlyName";
if (procKey != null)
{
object valueObj = procKey.GetValue(friendlyName);
string value = valueObj as string;
if (value != null)
{
cpuName = value;
}
}
}
if (cpuName != null)
{
break;
}
++memberIndex;
}
}
finally
{
if (hDiSet != IntPtr.Zero)
{
NativeMethods.SetupDiDestroyDeviceInfoList(hDiSet);
hDiSet = IntPtr.Zero;
}
}
return(cpuName);
}
