C#•7mo ago

How to marshall pointer to array inside struct

I have the following struct

[StructLayout(LayoutKind.Sequential)]
public unsafe struct Font
{
    public int BaseSize;
    public int GlyphCount;
    public int GlyphPadding;
    public Texture Texture;
    public Rectangle* Recs;
    public GlyphInfo* Glyphs;
}

[StructLayout(LayoutKind.Sequential)]
public unsafe struct Font
{
    public int BaseSize;
    public int GlyphCount;
    public int GlyphPadding;
    public Texture Texture;
    public Rectangle* Recs;
    public GlyphInfo* Glyphs;
}

Here Recs and Glyphs are C like arrays iirc. I want to marshal them to managed ones but I get the following error

[StructLayout(LayoutKind.Sequential)]
public unsafe struct Font
{
    public int BaseSize;
    public int GlyphCount;
    public int GlyphPadding;
    public Texture Texture;
    // Already tried [MarshalAs(UnmanagedType.ByValArray)]
    public Rectangle[] Recs;
    public GlyphInfo[] Glyphs;
}

[StructLayout(LayoutKind.Sequential)]
public unsafe struct Font
{
    public int BaseSize;
    public int GlyphCount;
    public int GlyphPadding;
    public Texture Texture;
    // Already tried [MarshalAs(UnmanagedType.ByValArray)]
    public Rectangle[] Recs;
    public GlyphInfo[] Glyphs;
}

Error SYSLIB1051 : The type 'MyNamespace.Font' is not supported by source-generated P/Invokes. The generated source will not handle marshalling of parameter 'font'.

Error SYSLIB1051 : The type 'MyNamespace.Font' is not supported by source-generated P/Invokes. The generated source will not handle marshalling of parameter 'font'.

I am using LibraryImport

8 Replies

OdexOP•7mo ago

even if I made a custom marshaller, will my code actually compile? I think it doesn't like the type being an array at all. ain't much useful copy-pasting a link with no further explanatory btw hmm I'll try also @cap5lut https://discord.com/channels/143867839282020352/169726586931773440/1239284198968397935 what about this situation

MODiX•7mo ago

cap5lut

if yes, there are inline arrays, tho u need a type for each size:

[InlineArray(10)]
public struct BufferWith10Elements<T>
{
  private T _element0;
}

public struct MyStruct
{
  public int someValue;
  public BufferWith10Elements<int> numbers;
}

[InlineArray(10)]
public struct BufferWith10Elements<T>
{
  private T _element0;
}

public struct MyStruct
{
  public int someValue;
  public BufferWith10Elements<int> numbers;
}

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OdexOP•7mo ago

on second thought, do I need to know Rectangle* Recs size in order to make a managed array/span? like the span constructor takes length as a second parameter i remember

OdexOP•7mo ago

@calledude you were right, after making my own marshaller I don't get error anymore

OdexOP•7mo ago

let's test

cap5lut•7mo ago

ive never touched interop with native myself, i cant help here, sorry

Unknown User•7mo ago

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sibber•7mo ago

thats not supported yet by LibraryImport afaik youd have to write a custom marshaller or use DllImport which is what id recommend

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How to marshall pointer to array inside struct