API:System.Variants

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Classes

EVariantArrayCreateError	EVariantArrayCreateError is the exception class for failure to create or resize a variant array.
EVariantArrayLockedError	EVariantArrayLockedError is the exception class for errors that occur because a variant array is locked or fixed.
EVariantBadIndexError	EVariantBadIndexError is the exception class for errors that occur because a variant array index is out of bounds.
EVariantBadVarTypeError	EVariantBadVarTypeError is the exception class for variant type errors.
EVariantDispatchError	EVariantDispatchError is the exception class for failed dispatch attempts.
EVariantInvalidArgError	EVariantInvalidArgError is the exception class for operations that fail due to invalid variant data.
EVariantInvalidNullOpError	EVariantInvalidNullOpError is the exception class for invalid Null variant operations.
EVariantInvalidOpError	EVariantInvalidOpError is the exception class for invalid variant operations.
EVariantNotAnArrayError	EVariantNotAnArrayError is the exception class inappropriate variant array operations.
EVariantNotImplError	EVariantNotImplError is the exception class for unimplemented variant operations.
EVariantOutOfMemoryError	EVariantOutOfMemoryError is the exception class for variant operations that cannot allocate necessary memory.
EVariantOverflowError	EVariantOverflowError is the exception class for overflow in a variant operation.
EVariantRangeCheckError	EVariantRangeCheckError is the exception class for out-of-range errors in a variant operation.
EVariantTypeCastError	EVariantTypeCastError is the exception class for variant type cast errors.
EVariantUnexpectedError	EVariantUnexpectedError is the exception class for unexpected variant errors.
IVarInstanceReference	IVarInstanceReference is the interface for extracting the instance that represents the data from a Variant of the custom type.
IVarInvokeable	IVarInvokeable is the interface for custom Variant types that implement dynamic properties and methods.
TCustomVariantType	TCustomVariantType is the base class for Delphi custom variant types.
TCustomVariantTypeClass	TCustomVariantTypeClass defines the metaclass for TCustomVariantType.
TInvokeableVariantType	TInvokeableVariantType is the base class for custom Variant types that implement custom Variants with properties and methods.

Routines

DynArrayFromVariant	Creates a dynamic array from a Variant.
DynArrayToVariant	Creates a Variant array from a dynamic array.
EmptyParam	Contains an OleVariant that represents an unused optional parameter on a dual interface.
FinalizeDispatchInvokeArgs	Releases the Args parameters passed to the method identified by CallDesc dispatch call descriptor.
FindCustomVariantType	Retrieves the object that implements a custom Variant type.
FindVarData	Returns pointer to variant's data.
GetDispatchInvokeArgs	Returns the TVarDataArray array of parameters specified in the CallDesc call descriptor in the DispInvoke method.
HandleConversionException	Handles exceptions during variant type conversions.
InitVariantConstants
Null	Returns a Null variant.
Unassigned	Returns an "empty" variant.
VarArrayAsPSafeArray
VarArrayCreate	Creates a variant array.
VarArrayCreateError	Indicates an array creation error.
VarArrayDimCount	Returns number of dimensions of a variant array.
VarArrayGet	Returns a Variant that represents a single value from a multi-dimensional Variant array.
VarArrayHighBound	Returns high bound for a dimension in a variant array.
VarArrayLock	Locks a variant array and returns a pointer to the data.
VarArrayLowBound	Returns the low bound of a dimension in a variant array.
VarArrayOf	Creates and fills a one-dimensional variant array.
VarArrayPut	Sets the value of a single cell in a multi-dimensional Variant array.
VarArrayRef	Returns a reference to the specified variant array.
VarArrayUnlock	Unlocks a variant array.
VarAsError	Converts a HRESULT into an Error variant.
VarAsType	Converts a variant to specified type.
VarCastError	Raises an EVariantTypeCastError exception.
VarCheckEmpty	Raises an exception if a specified variant's value is Unassigned.
VarCompareValue	Returns the relationship between Variants.
VarCopyNoInd	Copies a Variant.
VarEnsureRange	Returns a Variant with a value in a specified range.
VarFromDateTime	Returns a variant containing a specified data and time.
VarInRange	Indicates whether a Variant's value is in a specified range.
VarInvalidNullOp	Indicate variant operation on null.
VarInvalidOp	Indicate invalid variant operation.
VarIsArray	Indicates whether the specified variant is an array.
VarIsByRef	Indicates whether the specified variant's value is by reference.
VarIsClear	Indicates whether the specified variant has an undefined value.
VarIsCustom	Indicates whether the specified variant is a custom variant.
VarIsEmpty	Indicates whether the specified variant is unassigned.
VarIsEmptyParam	Indicates whether the specified variant represents an unassigned optional parameter.
VarIsError	Indicates whether the specified variant is an error variant; optionally converts variant back to HRESULT.
VarIsFloat	Indicates whether the specified variant represents a floating-point value.
VarIsNull	Indicates whether the specified variant is Null.
VarIsNumeric	Indicates whether the specified variant represents a numeric value.
VarIsOrdinal	Indicates whether the specified variant represents an ordinal value.
VarIsStr	Indicates whether the specified variant represents a string value.
VarIsType	Indicates whether the specified variant represents a specified type.
VarOverflowError	Raises an EVariantOverflowError exception.
VarRangeCheckError	Raises an EVariantRangeCheckError exception.
VarResultCheck	Raises variant exception based on HRESULT value.
VarSameValue	Indicates whether two Variants have equivalent values.
VarSupports	Indicates whether the Variant's value is an interface that supports a specified interface.
VarToDateTime	Converts a specified variant to a TDateTime value.
VarToStr	Converts a variant's value to a string.
VarToStrDef	Converts a variant's value to a string.
VarToWideStr	Converts a variant's value to a WideString.
VarToWideStrDef	Converts a variant's value to a WideString.
VarType	Returns the type code of a specified variant.
VarTypeAsText	Returns variant type descriptive string.
VarTypeIsValidArrayType	Indicates whether a Variant type code represents a type that can be used for the elements in a Variant array.
VarTypeIsValidElementType	Indicates whether a Variant type code represents a type that can be used for the elements in a Variant array.

Types

TAnyProc	TAnyProc represents a pointer to a procedure that accepts a parameter of type TVarData.
TBooleanToStringRule	TBooleanToStringRule enumerates possible rules for BooleanToStringRule.
TNullCompareRule	TNullCompareRule enumerates possible rules for comparing variant nulls with other values.
TStringRef	A record containing references to string types.
TStringRefList	Defines an array of TStringRef records.
TVarCompareResult	TVarCompareResult describes the results of comparing two Variants.
TVarDataArray	TVarDataArray is an array of TVarData records.
TVarDispProc	TVarDispProc defines a pointer to a procedure used as support for IDispatch-based Automation.
TVariantRelationship	TVariantRelationship describes the results of comparing two Variants.

Variables

BooleanToStringRule	Specifies rule fixing up Boolean values converted to strings.
ChangeAnyProc	Provides the support for changing the type of a Variant from varAny to a real Variant.
ClearAnyProc	Provides the support for clearing a Variant of type varAny.
DispatchUnsignedAsSigned	Instructs the run time to send unsigned values as signed integers. Setting this global variable is useful for automation servers.
NullAsStringValue	Specifies string value of Null variants.
NullEqualityRule	Specifies rule for Null variant equality comparison.
NullMagnitudeRule	Specifies rule for Null variant magnitude comparison.
NullStrictConvert	Specifies whether Null conversion is an error.
OleVariantInt64AsDouble	Controls the mode in which Int64 values are stored in a OleVariant.
PackVarCreation	Specifies whether space-efficient Variant Types are preferred.
RefAnyProc	Provides the support for increasing the reference count of a Variant of type varAny.
VarDispProc	Provides the support for IDispatch-based Automation.

Constants

MaxDispArgs

MaxDispArgs: Integer = $40;