Managed GUID to unsafe win32 GUID struct

[Pål A.]

I need to convert a managed GUID (or GUID in string format) into an
unsafe win32 GUID struct. Any ideas?

How to convert this:

string DEVICECLASS = "{a5dcbf10-6530-11d2-901f-00c04fb951ed}";

into an instance of this:

[StructLayout(LayoutKind.Sequential)]
public unsafe struct GUID
{
public int Data1;
public System.UInt16 Data2;
public System.UInt16 Data3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] data4;
}

Thanks

 

[Willy Denoyette [MVP]]

I need to convert a managed GUID (or GUID in string format) into an
unsafe win32 GUID struct. Any ideas?

How to convert this:

string DEVICECLASS = "{a5dcbf10-6530-11d2-901f-00c04fb951ed}";

into an instance of this:

[StructLayout(LayoutKind.Sequential)]
public unsafe struct GUID
{
public int Data1;
public System.UInt16 Data2;
public System.UInt16 Data3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] data4;
}

Thanks

System.Guid *is* a structure, you can pass it *as is* to unmanaged code, no
need to declare your own.

[DllImport(".......")]
public static extern void PassGuidToUnmanaged(Guid g);
...
string DEVICECLASS = "{a5dcbf10-6530-11d2-901f-00c04fb951ed}";
Guid g = new Guid(DEVICECLASS);
PassGuidToUnmanaged(g);

Willy.