How to properly use the "NativeStruct" from current Conari Version?

[CodingMadness]

In your video: https://www.youtube.com/watch?v=QXMj9-8XJnY

you used the obsolete-way with UnmanagedStructure, now you suggest using the NativeStruct way, can u maybe give me a short example of how to make use of those properly, to be able to call it from C++/Delphi?

Because, when i compile the following code:

I get the error you can see in the "Error-dialogbox" below in the screenshot.

How to adapt to that new change you have done for Conari?

Much thanks!

[CodingMadness]

Sry, my bad, the code issue relied on smth else... forget this ticket!

[3F]

You're right, UnmanagedStructure is marked as obsolete and planned to be removed in future major releases.

Please note, modern NativeStruct provides several ways https://github.com/3F/Conari/wiki/Quick-start#conari-types

For example, you don't need a CLR types declarations at all if this is a fully automatic way, in your example,

NativeStruct.Make.t<CharPtr, int>("a", "b").Struct;

Also do not need a manual marshaling (Marshal.PtrToString...) everything is automated.

This project unfortunately does not provide some good documentations today, but please first try my tests as an example:

• https://github.com/3F/regXwild/blob/master/dotnetTest/ConariMatchTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/BindingContextTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/Types/NativeStructTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/Types/NativeStringTest.cs

Let me know if you still have some problems, I'll try to look into later.

[3F]

Sry, my bad, the code issue relied on smth else... forget this ticket!

I see :) Just close it yourself if it's ok

[CodingMadness]

You're right, UnmanagedStructure is marked as obsolete and planned to be removed in future major releases.

Please note, modern NativeStruct provides several ways https://github.com/3F/Conari/wiki/Quick-start#conari-types

For example, you don't need a CLR types declarations at all if this is a fully automatic way, in your example,

NativeStruct.Make.t<CharPtr, int>("a", "b").Struct;

Also do not need a manual marshaling (Marshal.PtrToString...) everything is automated.

This project unfortunately does not provide some good documentations today, but please first try my tests as an example:

• https://github.com/3F/regXwild/blob/master/dotnetTest/ConariMatchTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/BindingContextTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/Types/NativeStructTest.cs
• https://github.com/3F/Conari/blob/master/ConariTest/Types/NativeStringTest.cs

Let me know if you still have some problems, I'll try to look into later.

Thanks so far for that example!

My only question now is: by using .NET 6, i am using "record struct" feature, to test this out, but since i have a feeling that it wont work like this, i created a struct-wrapper around that record-struct, like this:

And would this code I have written to allocate unmanaged.memory for that wrapper be okay?

have a look:

Thanks in advanced!

[3F]

but since i have a feeling that it wont work like this

Why? Did you try it?

~
NativeStruct<SomeRecordStructDef> ns = new(instance);

record struct (record ie. records) just tells the compiler to override some default operators and implements some extra logic in basic struct type for new features available in modern C# and so on.

So I don't see the problem as long as it's marked as LayoutKind.Sequential.
Or use Conari's chains to construct any fields at runtime.

If you need some wrapping in any case,

Well, you can implement some cloning of the available fields into some new type like

SomeRecordStruct srs = ...
using NativeStruct<Wrapper> ns = new(srs.Clone());

Or note, NativeStruct also provides accessing to IntPtr if you want to wrap it inside somewhere somehow

NativeStruct<Wrapper> ns = ...
IntPtr ptr = ns;

etc.

[3F]

by the way, actually LayoutKind.Sequential limitation is not really ... FYI, https://twitter.com/github3F/status/1317526371921502210

[CodingMadness]

sadly tho, my code based on ur suggestion compiles fine BUT then this:

?
here code:

This is my converter-record:

[3F]

@Shpendicus

The "empty" export table does not related to NativeStruct use at all. This is not related even for .NET 6 limitation (I hope).

As I said here 3F/DllExport#197 (comment)

Make sure you're looking at correct assembly (x64 or x86 folder if you're using both arch)

Or, please open new issue on DllExport project as a bug since empty export directory. I'll investigate it later. Only please follow report steps and provide all minimal information about settings etc. Thanks.

[CodingMadness]

This is entire function to call the "public static int AllocRecord() {return 10 + 35};" function from .NET 6 and sadly, the equivalent call in Delphi, SEES my exported functions, i get a valid pointer from GetProcAdress(...) BUT when i call it, it shows;:

"External Exception: 0434352"

do you have maybe a clue how this possible? Again, both LoadLib and GetProcAdr do work! and return seeminlgy valid pointers, but then that exception raises for some reason. really strange.

[3F]

the equivalent call in Delphi, SEES my exported functions

As I see, the "empty" problem is fixed now?

"External Exception: 0434352"
do you have maybe a clue how this possible?

Depends on your configuration. Copy everything from DllExport's Data tab in GUI

Did you try Use our IL Assembler + Rebase System Object ?

[CodingMadness]

the equivalent call in Delphi, SEES my exported functions

As I see, the "empty" problem is fixed now?

"External Exception: 0434352"
do you have maybe a clue how this possible?

Depends on your configuration. Copy everything from DllExport's Data tab in GUI

Did you try Use our IL Assembler + Rebase System Object ?

sry mate but how u mean "Copy everything from DllExport's Data tab in GUI"

Did you try Use our IL Assembler + Rebase System Object ?
And what u mean by this? I used ur config tool with the GUI, and i did exactly as u did , idk, for the Conari version I m not sure what to use else , i only copied the config from ur GUI in the yt video. :/ not sure what to change.

[3F]

Modern 1.7+

1. Check the mentioned options on the right
2. [Data] - You can find it after end of project list as you can see

for the Conari version I m not sure what to use else

For Conari everything is fine :)

[CodingMadness]

I really, did the exact same settings u took there in the image above. but i get the above error :/

maybe im just a jerk xD

[3F]

About full sign, here 3F/coreclr#6

maybe im just a jerk xD

Too many features, dependencies, limitations, and a bit documentation.
I mean not everything is so bad :) Feel free to ask, change via PR, or suggest something, and we'll find solution together.