FS_QUADPOINTSF (and some others structs) marshalling issue

[sergeyleliukh]

FS_QUADPOINTSF contains only Fields but for working with PDFium marshalling needs Properties

[StructLayout(LayoutKind.Sequential)]
public struct FS_QUADPOINTSF
{
public float X1 { get; }
public float Y1 { get; }
....
}

but needs

[StructLayout(LayoutKind.Sequential)]
public struct FS_QUADPOINTSF
{
public float X1;
public float Y1;
...
}

for example, try to call FPDFAnnot_AppendAttachmentPoints

[bradleypeet]

The auto properties in that struct have backing fields. What happens when you try to call FPDFAnnot_AppendAttachmentPoints?

[sergeyleliukh]

StructLayout dont see private auto properties, only public..?

PDFium.FPDFAnnot_AppendAttachmentPoints(annot, quad);
System.Runtime.InteropServices.MarshalDirectiveException : Cannot marshal 'parameter #2': Invalid managed/unmanaged type combination (this value type must be paired with Struct).

It looks like the problem is related to the original ArgusMagnus/PDFiumSharp lib, ArgusMagnus#33