The FreeBASIC examples use the native wx-c interface. The publisher's WX.Net 0.9.2 archive contains the matching wx-c-0-9-0-2.dll and C wrapper source. The archive is wx.NET-0.9.2.zip, with SHA-256 33f36659bf459d5fee9ac6d6a774db600d426036a4bf54859a0c766d88a57ba0.

The supplied Windows DLL is i386 and uses StdCall exports. Build a 32-bit FreeBASIC executable with a matching runtime and import library, including when running on a 64-bit Windows PC. Its runtime dependencies include the x86 Visual C 2008 CRT. FreeBASIC calls the native DLL directly.

A newly built wrapper must match the header's calling convention as well as its architecture. The publisher's source selects different export conventions for MSVC and GNU builds; an arbitrary recompiled DLL is not interchangeable with its original Windows binary. Current native Windows qualification covers the publisher DLL, both FreeBASIC backends and all four examples. Linux i386 qualification uses all 156 wrapper translation units from the same archive with the genuine wxWidgets 2.8.12 GTK2 Unicode SDK. Both FreeBASIC backends pass C primitive-width comparisons, UTF-8 string/colour checks and all four original GUI examples on a private Xvfb display. The examples render real GTK2 widgets and close through their normal event path, including the demo's final confirmation. This scope does not establish physical display operation.

The native GNU wrapper uses Cdecl exports and links here as libwx-c-0-9-0-2.so, matching the binding name. Its underlying wxWidgets libraries must remain on the runtime loader path. The qualified build uses Linux i386 throughout; provide matching 32-bit FreeBASIC runtimes and GTK2 dependencies on an amd64 host. The source expects wxWidgets 2.8; current 3.x SDKs are not interchangeable. On this Linux build wchar_t is 32 bits, while the Windows SDK uses 16 bits. wxString_CharAtUTF16 retains that native return type despite its historical name.

Use WXCALL on application, event, MDI and sizer callbacks. C int arguments and results use wxInt/wxUInt, which are 32-bit Long/ULong. wxLong follows C long through clong; it is 32 bits on Windows and 64 bits on LP64 Linux.

The GUI event loop runs on its application thread. Windows own their child controls and attached sizers. Callback code must keep borrowed handles valid until their owning widget is destroyed. Sizer disposal callbacks must not continue using the released sizer.

Label and title APIs copy their string arguments. Release temporary wxString wrappers with wxString_dtor after those calls. Controls also copy fonts and colours; release application-created wrappers after their last use. The stock pointer returned by wxFont_SMALL_FONT belongs to the library and must not be destroyed.

The examples demonstrate font and colour inheritance, four MDI child frames, resizeable box-sizer layout, and a modal dialog with native button callbacks. Close the windows normally. The dialog example displays its final confirmation during the application's exit callback.