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varStrArg

varStrArg = 72

Example​

function HasInternalStrArgTag(const Value: Variant): Boolean;
begin
  Result := (VarType(Value) and varTypeMask) = varStrArg;
end;

Usage​

varStrArg exposes the historical Variant code 72, now aligned with VT_CLSID and unsuitable as a normal script string type.

Additional Technical Info​

varStrArg is the base TVarType code $0048. Velox exposes it because the modified compiler imports Delphi's historical constant set. In the current Delphi System.pas, code 72 is annotated as OLE VT_CLSID; older documentation has also described varStrArg as a COM-compatible argument string.

That history makes it an interoperability/internal tag, not a normal durable script string type. Ordinary current text Variants use varUString, varString or Automation varOleStr.

Do not synthesize this type

  • Do not pass varStrArg to VarAsType or VarArrayCreate as a general string conversion target.
  • Do not assume its payload is a managed Delphi string or safe to dereference.
  • If a native/Automation provider supplies the tag, follow that exact provider's ABI, ownership and lifetime contract; copy usable text through its documented API.
  • Never persist numeric code 72 as proof that a field contains text. Delphi/OLE version and ABI context are essential.

VarType can report the code without interpreting the payload. This page intentionally documents the current source conflict rather than repeating the older friendly label as guaranteed behavior.

The example is source-reviewed only; no internal payload was created or read.

External references

Created 2026-07-15