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How can one bring graphics component in C++ to work under C#

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  • Latest Post Latest Post by Momerath

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Given the exchange between and , here is a compact, practical plan for getting an unmanaged C++ graphics component to work from C#.

Decide by how the native component exposes functionality and where it renders. If it exports plain C functions (extern "C"), use P/Invoke (DllImport) and marshal buffers as IntPtr or byte arrays. If it exposes C++ classes or complex types, create a thin C++/CLI (/clr) mixed‑mode wrapper that exposes managed ref classes which forward to native objects. If the component is COM-ready, use COM interop. For rendering specifically: if the native code draws to an HWND, host that native window inside WinForms or WPF (HwndHost). If it produces pixel data, have native code fill an offscreen buffer and convert it to a System.Drawing.Bitmap or a WPF BitmapSource on the managed side. For DirectX, prefer D3DImage/DXGI interop or a swapchain approach rather than trying to redraw device contexts across managed/unmanaged boundaries.

Common pitfalls and checks: calling convention (cdecl vs stdcall) and 32/64-bit mismatches are frequent crash causes; UI/graphics contexts are thread‑affine, so create/use them on the correct thread; ensure native resources are explicitly released (IDisposable pattern + finalizer); compile the wrapper with /clr and matching runtime libraries. For implementation patterns and build settings see Microsoft guidance on P/Invoke (Platform invoke) and .

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Member Avatar for Momerath

Explain more. Do you want to call a C++ DLL from C#?

Member Avatar for vincezed

no , not exactly. Like an unmanaged graphics code that is made to work in C#

Edited by vincezed because: n/a
Member Avatar for Momerath

You want to convert some C++ code to managed C#, or unmanaged C#? Or am I still not understanding you.

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