System.TVarType
Delphi
type TVarType = Word;
C++
typedef Word TVarType;
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
type typedef |
public | System.pas System.hpp |
System | System |
Description
Is a variant type code.
TVarType is used by TVarData and TCustomVariantTypeClass to represent variant type codes.
The type of a variant can be set as in the following code (Delphi):
{ The type of Variant V is set to String }
TVarData(V).VType := varString;
The variant types are described in the following table:
Variant Type | Description |
---|---|
varEmpty | The variant is Unassigned. |
varNull | The variant is Null. |
varAny | Represents a Variant that can hold any value. |
varSmallint | 16-bit signed integer (type Smallint in Delphi, short in C++). |
varInteger | 32-bit signed integer (type Integer in Delphi, int in C++). |
varSingle | Single-precision floating-point value (type Single in Delphi, float in C++). |
varDouble | Double-precision floating-point value (type double). |
varCurrency | Currency floating-point value (type Currency). |
varDate | Date and time value (type TDateTime). |
varOleStr | Reference to a dynamically allocated UNICODE string. |
varDispatch | Reference to an Automation object (an IDispatch interface pointer). |
varError | Operating system error code. |
varBoolean | 16-bit Boolean (type WordBool). |
varVariant | Indicates another variant. |
varUnknown | Reference to an unknown object (an IInterface or IUnknown interface pointer). |
varShortInt | 8-bit signed integer (type ShortInt in Delphi or signed char in C++). |
varByte | A Byte. |
varWord | Unsigned 16-bit value (Word). |
varLongWord | Unsigned 32-bit value (type LongWord in Delphi or unsigned long in C++). |
varInt64 | 64-bit signed integer (Int64 in Delphi or __int64 in C++). |
varStrArg | COM-compatible string. |
varString | Reference to a dynamically allocated string (not COM-compatible). |
varArray | Indicates a Variant array. |
varByRef | Indicates that the variant contains a reference as opposed to a value. |
varTypeMask | Indicates the type of each array element. |
Note: The code of each variant type is listed on the System unit page (section Constants).