internal Guid GetProperty(IntPtr hDevInfoSet, NativeMethods.SP_DEVINFO_DATA devData, NativeMethods.SetupDiRegistryProperty property, Guid defaultValue)
{
if (devData == null)
{
throw new ArgumentNullException("devData");
}
int propertyRegDataType = 0;
int requiredSize;
// ( 32(hex-digits) + 4(dashes) + 2(braces) + 1(null) ) * 2-bytes/char = 78 bytes
// ex. "{745A17A0-74D3-11D0-B6FE-00A0C90F57DA}"
int propertyBufferSize = 78;
IntPtr propertyBuffer = Marshal.AllocHGlobal(propertyBufferSize);
if (!NativeMethods.SetupDiGetDeviceRegistryProperty(hDevInfoSet,
devData,
property,
out propertyRegDataType,
propertyBuffer,
propertyBufferSize,
out requiredSize))
{
int error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(propertyBuffer);
if (error != NativeMethods.ERROR_INVALID_DATA)
{
Trace.WriteLine(String.Format("Warning: {0}.GetProperty() - SetupDiGetDeviceRegistryProperty({1}) failed. {2}({3})", this.GetType(), property, new Win32Exception(error).Message, error));
}
// throw new Win32Exception(error);
return(defaultValue);
}
String guidStr = Marshal.PtrToStringAuto(propertyBuffer);
Marshal.FreeHGlobal(propertyBuffer);
return(new Guid(guidStr));
}
internal int GetProperty(IntPtr hDevInfoSet, NativeMethods.SP_DEVINFO_DATA devData, NativeMethods.SetupDiRegistryProperty property, int defaultValue)
{
if (devData == null)
{
throw new ArgumentNullException("devData");
}
int propertyRegDataType = 0;
int requiredSize;
int propertyBufferSize = Marshal.SizeOf(typeof(int));
IntPtr propertyBuffer = Marshal.AllocHGlobal(propertyBufferSize);
if (!NativeMethods.SetupDiGetDeviceRegistryProperty(hDevInfoSet,
devData,
property,
out propertyRegDataType,
propertyBuffer,
propertyBufferSize,
out requiredSize))
{
int error = Marshal.GetLastWin32Error();
Marshal.FreeHGlobal(propertyBuffer);
if (error != NativeMethods.ERROR_INVALID_DATA)
{
Trace.WriteLine(String.Format("Warning: {0}.GetProperty() - SetupDiGetDeviceRegistryProperty({1}) failed. {2}({3})", this.GetType(), property, new Win32Exception(error).Message, error));
}
// throw new Win32Exception(error);
return(defaultValue);
}
int value = (int)Marshal.PtrToStructure(propertyBuffer, typeof(int));
Marshal.FreeHGlobal(propertyBuffer);
return(value);
}
