Memory corruption with C# [Csharp] bindings

[GeneThomas]

i. version of lib3mf: 2.2.0
ii. operating system: Windows 10
iii. what did you do:
Compiled and ran the attached project:

class ThreeMfTest
{
    public static void Main()
    {
        CModel model = Wrapper.CreateModel();

        CColorGroup colorGroupTest = model.AddColorGroup();
        sColor redTest = Wrapper.RGBAToColor(255, 0, 0, 255);
        uint idRedTest = colorGroupTest.AddColor(redTest);
        // throws System.AccessViolationException:
        //   HResult = 0x80004003
        //   Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
    }
}

iv. expected:
I expected the code to not throw an exception
v.
It throws an exception indicating that memory has probably been corrupted.

I shall attach a full solution .sln etc.. so the fault can be reproduced.

[GeneThomas]

3MfTest.zip

Attached is zip file containing C# solution to exercise the fault.

When I am finish I shall have some C# examples translated from C++ that you can add to your package.

[GeneThomas]

lib3MF v2.1.1 and v2.0.0 have the same fault, has the CSharp bindings ever worked?

[rahimshahid]

Having the exact same problem with version 2.2.0 (and older versions as well e.g. 2.1.1, 2.0.1 & 2.1.0).

Problem does not only occur with adding colors, it also occurs once you add a material e.g.

CModel rootModel= Wrapper.CreateModel();
var baseMatGroup = rootModel.AddBaseMaterialGroup();
var darkBlue = Lib3MF.Wrapper.RGBAToColor(20, 20, 90, 255);
baseMatGroup.AddMaterial("material1", darkBlue); // ---> throws the same exception 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'

Any idea how to solve this or any Work Around to get the colors working on C# ?

[CallMeSwal]

Hey just pinging this thread to see if there is any solution? We are also getting "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." when trying to add color to model with c# bindings (v2.3.2).

[vijaiaeroastro]

@CallMeSwal We honestly do not even have tests for C Sharp bindings. We will consider this for the 2.4.2 release. We have improved the Python and Golang bindings in the past two releases. We will consider C Sharp binding improvements for the current release.

[CallMeSwal]

@vijaiaeroastro thanks for the quick reply! Can you confirm if all of the Python bindings are tested for v2.3.2?

[vijaiaeroastro]

@CallMeSwal Yes. I suggest using 2.3.3, recently released after we found an issue in Mac OS. However, Python bindings are pretty stable, and we have ported almost every example from C++ to Python

https://github.com/3MFConsortium/lib3mf/tree/master/SDK/Examples/Python