http://docwiki.embarcadero.com/RADStudio/Rio/en/Delphi_Data_Types_for_API_Integration
Delphi Data Types for API Integration
Integer Data Types
| Type | Description | Pointer |
|---|---|---|
| Byte | 8-bit unsigned integer | PByte |
| ShortInt | 8-bit signed integer | PShortInt |
| Word | 16-bit unsigned integer | PWord |
| SmallInt | 16-bit signed integer | PSmallInt |
| Cardinal | 32-bit unsigned integer | PCardinal |
| LongWord | 32-bit unsigned integer (32-bit Windows, OSX32, 32-bit iOS, and Android platforms) | PLongWord |
| FixedUInt | 32-bit unsigned integer | PFixedUInt |
| Integer | 32-bit signed integer | PInteger |
| LongInt | 32-bit signed integer (32-bit Windows, OSX32, 32-bit iOS, and Android platforms) | PLongint |
| FixedInt | 32-bit signed integer | PFixedInt |
| UInt64 | 64-bit unsigned integer | PUInt64 |
| Int64 | 64-bit signed integer | PInt64 |
| NativeUInt | 64-bit or 32-bit platform-dependent unsigned integer | PNativeUInt |
| NativeInt | 64-bit or 32-bit platform-dependent signed integer | PNativeInt |
Floating-point Data Types
| Type | Description | Pointer | Record |
|---|---|---|---|
| Single | Single precision floating-point value (4 bytes) | PSingle | TSingleRec |
| Double | Double precision floating-point value (8 bytes) | PDouble | TDoubleRec |
| Extended | Extended precision floating-point value (10 bytes on Win32, but 8 bytes on Win64) See page about multi-device applications. | PExtended | TExtended80Rec |
| Real | Alias of Double | N/A | N/A |
String and Character Data Types
| Type | Description | Pointer |
|---|---|---|
| AnsiChar | ANSI character | PAnsiChar |
| Char | Wide character (16-bit) | PChar |
| WideChar | 16-bit character | PWideChar |
| AnsiString | Represents a dynamically allocated ANSI string whose maximum length is limited only by available memory. | PAnsiString |
| RawByteString | Use as a "codepage-agnostic" parameter to a method or function, or as a variable type to store BLOB data. | PRawByteString |
| UnicodeString | Unicode string | PUnicodeString |
| String | Alias for UnicodeString | PString |
| ShortString | A string of maximum 255 characters | PShortString |
| WideString | A string of 16-bit characters | PWideString |
File Data Types
| Type | Description | Pointer |
|---|---|---|
| File | File descriptor | |
| TextFile, Text | Text file descriptor |
Boolean Data Types
| Type | Description | Pointer |
|---|---|---|
| Boolean | Represents a logical value (true or false). | PBoolean |
| ByteBool | Represents an 8-bit logical value. | |
| WordBool | Represents a 16-bit logical value. | PWordBool |
| LongBool | Represents a 32-bit logical value. | PLongBool |
Other Data Types
| Type | Description | Pointer |
|---|---|---|
| Array | Represents an indexed collection of elements of the same type. | |
| Record | Represents a heterogeneous set of elements. | |
| Variant | Represents values that can change type at run time. | PVariant |
| Pointer | Represents a pointer to data of any type. | PPointer |
| Currency | A fixed-point data type used to hold monetary values. | PCurrency |