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erNoMainProc

erNoMainProc = 7

Example​

function IsMissingMainProcedure(const ErrorType: TIFException): Boolean;
begin
  Result := ErrorType = erNoMainProc;
end;

Usage​

erNoMainProc indicates that loaded Velox scripting bytecode does not provide a valid executable main procedure.

Formatting and exception state​

ExceptionToString ignores Param and returns the historical text no Main Proc.

Additional Technical Info​

erNoMainProc is member ordinal 7 of TIFException, the script-visible declaration that is kept in exact ordinal alignment with PascalScript's runtime TPSError. Its sidebar position 31 is alphabetical navigation metadata and is not its enumeration value.

erNoMainProc is used at the compiled-script entry boundary. LoadData emits it when the header's main-procedure number is outside the loaded procedure table (unless the special InvalidVal value is used). RunScript emits it when the selected main-procedure record is external rather than an executable internal script procedure. This is not the same as failing to look up a named exported procedure. erOutOfProcRange covers invalid procedure-number calls, while erCannotImport covers unresolved external declarations.

Behavior, recovery and quirks​

  • When FMainProc = InvalidVal, current RunScript returns False without setting erNoMainProc. A library-like artifact can therefore lack a main body without producing this category; callers must inspect the Boolean execution result as well as exception state.
  • The automatic producer does not include the stored index or procedure count, so retain the compiled artifact and load/run context.
  • Correct the compile/execution mode; do not use this category as a general “function not found” error.
  • Exception transfer is not a database, dataset, filesystem or external-system transaction. Any earlier side effect remains unless the called API or surrounding Flow provides an explicit rollback contract.
  • Do not persist the numeric ordinal as an integration contract. Store the member name, formatted message, parameter and relevant procedure/position with the Velox version.

Related Code Library entries

External references

Created 2026-07-15