Short description
๐งฉ C3D_NamespaceFix is an AutoCAD and Civil 3D diagnostic AutoLISP routine for checking the state of core arithmetic symbols and Visual LISP COM support.
๐ When loaded it checks whether the multiplication symbol is currently a normal AutoLISP SUBR and attempts vl-load-com when it is not.
๐ The routine then prints a namespace report for the multiplication addition subtraction and division symbols together with multiplication and COM tests.
Command:
๐ Startup behavior: the diagnostic runs immediately when C3D_NamespaceFix.lsp is loaded.
โ๏ธ Recovery attempt: vl-load-com can be called up to two times when the multiplication symbol is not reported as a SUBR.
๐ Output: C3D Namespace Report in the AutoCAD command line.
Description:
๐งฉ C3D_NamespaceFix is intended to diagnose AutoLISP namespace problems that can affect core arithmetic operators and Visual LISP COM functions in AutoCAD or Civil 3D.
๐ The routine first evaluates the multiplication symbol and checks whether its type is SUBR.
โ๏ธ If the multiplication symbol is not a SUBR the routine calls vl-load-com and performs the same check again for a second recovery attempt.
๐ After this attempt the file prints the detected types of the multiplication addition subtraction and division symbols.
๐งช It safely tests multiplication through vl-catch-all-apply and reports the result of multiplying 3 by 7.
๐ It also tests access to the AutoCAD COM object through vlax-get-acad-object and reports whether that protected call produced an error.
๐ง Finally it checks whether vl-load-com exists in the AutoLISP atom table.
Helper function: (if any)โ
๐งฉ type and eval are used to inspect the current symbol definitions.
๐งฉ vl-load-com attempts to initialize Visual LISP COM functionality.
๐งฉ vl-catch-all-apply protects the multiplication and COM diagnostic tests.
๐งฉ vl-catch-all-error-p identifies whether the protected COM test returned an error.
๐งฉ atoms-family and member verify whether vl-load-com is present in the current atom table.
Functionalities:
โ
๐ Checks whether the multiplication symbol is currently a SUBR.
โ
โ๏ธ Attempts vl-load-com when the multiplication symbol does not have the expected type.
โ
๐ Performs a second vl-load-com attempt when the condition remains unresolved.
โ
๐ Reports the current type of the multiplication addition subtraction and division symbols.
โ
๐งช Tests multiplication using a protected call with the values 3 and 7.
โ
๐ Tests whether vlax-get-acad-object can be called without a trapped COM error.
โ
๐ง Checks whether vl-load-com exists in the AutoLISP atom table.
โ
๐ฅ๏ธ Prints the complete diagnostic report directly to the AutoCAD command line.
Result:
๐ฏ The result is a compact AutoCAD namespace and Visual LISP COM diagnostic report.
๐งช The user can see whether the core arithmetic symbols appear to retain normal function definitions and whether a protected multiplication test succeeds.
๐ The report also indicates whether the AutoCAD COM access test produces an error and whether vl-load-com is present in the atom table.
Images, animations etc.
XAML code:
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<Bold>Function Syntax: C3D_NamespaceFix</Bold>
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<Bold>Version: 1.0 Date: 20.06.2026 3:11:44PM</Bold>
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<Bold><Run Foreground="DodgerBlue">Description</Run></Bold><LineBreak/>
<Run Foreground="White">๐งฉ C3D_NamespaceFix is an AutoCAD and Civil 3D diagnostic AutoLISP routine designed to inspect possible namespace problems affecting core arithmetic symbols and Visual LISP COM support.</Run><LineBreak/>
<Run Foreground="LimeGreen">๐ The routine checks the current state of the multiplication addition subtraction and division symbols and prints the results directly to the AutoCAD command line.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">Execution</Run></Bold><LineBreak/>
<Run Foreground="White">๐ There is </Run><Bold><Run Foreground="DarkRed">no separate AutoCAD command</Run></Bold><Run Foreground="White"> defined by this LISP.</Run><LineBreak/>
<Run Foreground="White">โ๏ธ The diagnostic runs immediately when </Run><Bold><Run Foreground="Orange">C3D_NamespaceFix.lsp</Run></Bold><Run Foreground="White"> is loaded.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">Primary Workflow</Run></Bold><LineBreak/>
<Run Foreground="White">โข The routine evaluates the multiplication symbol and checks whether its current type is </Run><Bold><Run Foreground="Orange">SUBR</Run></Bold><Run Foreground="White">.</Run><LineBreak/>
<Run Foreground="White">โข If the multiplication symbol is not a SUBR the routine calls </Run><Bold><Run Foreground="Orange">vl-load-com</Run></Bold><Run Foreground="White">.</Run><LineBreak/>
<Run Foreground="White">โข The same condition is checked again and </Run><Bold><Run Foreground="Orange">vl-load-com</Run></Bold><Run Foreground="White"> can be called a second time.</Run><LineBreak/>
<Run Foreground="White">โข A </Run><Bold><Run Foreground="Orange">C3D Namespace Report</Run></Bold><Run Foreground="White"> header is printed.</Run><LineBreak/>
<Run Foreground="White">โข The routine reports the detected type of the multiplication addition subtraction and division symbols.</Run><LineBreak/>
<Run Foreground="White">โข Multiplication is tested through </Run><Bold><Run Foreground="Orange">vl-catch-all-apply</Run></Bold><Run Foreground="White"> using 3 and 7.</Run><LineBreak/>
<Run Foreground="White">โข AutoCAD COM access is tested through </Run><Bold><Run Foreground="Orange">vlax-get-acad-object</Run></Bold><Run Foreground="White"> inside a protected call.</Run><LineBreak/>
<Run Foreground="White">โข The routine checks whether </Run><Bold><Run Foreground="Orange">vl-load-com</Run></Bold><Run Foreground="White"> is present in the current AutoLISP atom table.</Run><LineBreak/>
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<Bold><Run Foreground="LimeGreen">Functionalities</Run></Bold><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Namespace inspection</Run></Bold><Run Foreground="White"> - checks the current function type associated with important arithmetic symbols.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Visual LISP initialization attempt</Run></Bold><Run Foreground="White"> - calls vl-load-com when the multiplication symbol does not have the expected SUBR type.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Second recovery attempt</Run></Bold><Run Foreground="White"> - repeats vl-load-com when the multiplication symbol still does not report the expected type.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Arithmetic type report</Run></Bold><Run Foreground="White"> - displays the current type of multiplication addition subtraction and division.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Protected multiplication test</Run></Bold><Run Foreground="White"> - evaluates the multiplication function through vl-catch-all-apply.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">COM availability test</Run></Bold><Run Foreground="White"> - checks whether vlax-get-acad-object produces a trapped error.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Atom table verification</Run></Bold><Run Foreground="White"> - verifies whether vl-load-com exists in the AutoLISP symbol table.</Run><LineBreak/>
<Run Foreground="White">โ
</Run><Bold><Run Foreground="LimeGreen">Command line diagnostics</Run></Bold><Run Foreground="White"> - prints all results in one compact namespace report.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">Important Diagnostic Elements</Run></Bold><LineBreak/>
<Run Foreground="White">๐ </Run><Bold><Run Foreground="Orange">SUBR</Run></Bold><Run Foreground="White"> is the expected function type checked for the multiplication symbol.</Run><LineBreak/>
<Run Foreground="White">โ๏ธ </Run><Bold><Run Foreground="Orange">vl-load-com</Run></Bold><Run Foreground="White"> is the only recovery action attempted by the current source.</Run><LineBreak/>
<Run Foreground="White">๐งช </Run><Bold><Run Foreground="Orange">vl-catch-all-apply</Run></Bold><Run Foreground="White"> protects the multiplication and AutoCAD COM tests.</Run><LineBreak/>
<Run Foreground="White">๐ </Run><Bold><Run Foreground="Orange">vlax-get-acad-object</Run></Bold><Run Foreground="White"> is used to test Visual LISP COM access to AutoCAD.</Run><LineBreak/>
<Run Foreground="White">๐ง </Run><Bold><Run Foreground="Orange">atoms-family</Run></Bold><Run Foreground="White"> is used to verify that vl-load-com exists in the atom table.</Run><LineBreak/>
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<Bold><Run Foreground="DarkRed">Important Notes</Run></Bold><LineBreak/>
<Run Foreground="White">โ ๏ธ </Run><Bold><Run Foreground="DarkRed">The routine does not directly redefine the arithmetic operators</Run></Bold><Run Foreground="White"> multiplication addition subtraction or division.</Run><LineBreak/>
<Run Foreground="White">โ ๏ธ </Run><Bold><Run Foreground="DarkRed">The implemented fix action is limited to vl-load-com</Run></Bold><Run Foreground="White"> and therefore the file is primarily a diagnostic utility.</Run><LineBreak/>
<Run Foreground="White">โ ๏ธ The file name suggests namespace repair but the actual source mainly reports symbol state and tests Visual LISP COM availability.</Run><LineBreak/>
<Run Foreground="White">โ ๏ธ No drawing objects are selected modified created or deleted by this routine.</Run><LineBreak/>
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<Bold><Run Foreground="Yellow">SEO Keywords</Run></Bold><LineBreak/>
<Run Foreground="Yellow">๐ท๏ธ AutoCAD ๐ท๏ธ Civil 3D ๐ท๏ธ AutoLISP ๐ท๏ธ Visual LISP ๐ท๏ธ Namespace diagnostics ๐ท๏ธ vl-load-com ๐ท๏ธ COM diagnostics ๐ท๏ธ AutoCAD troubleshooting ๐ท๏ธ Civil 3D troubleshooting ๐ท๏ธ SUBR ๐ท๏ธ vl-catch-all-apply ๐ท๏ธ vlax-get-acad-object ๐ท๏ธ CAD diagnostics ๐ท๏ธ CAD automation</Run><LineBreak/>
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