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Data Type Conversions

Each programming language defines certain types and containers for data. Most of these data types, especially the primitives, map easily to other programming languages. Some data types, however, have no equivalent in another language and cannot be converted.

For specific information about data types not recognized by your programming language, see the following topics:

The following table lists conversions between programming languages for common data types.

C++ Visual Basic Java Contains

signed char

Not supported

byte

1-byte signed integer

(VT_I1, [T])

unsigned char

Byte

Not supported

1-byte unsigned integer

(VT_UI1, [V][T][P][S])

unsigned char

Character

char

2-byte Unicode character

(VT_UI2, [T][P])

short

Integer

short

2-byte signed integer

(VT_I2, [V][T][P][S])

unsigned short

Not supported

Not supported

2-byte unsigned integer

(VT_UI2, [T][P])

int

Long

int

4-byte signed integer

(VT_I4, [V][T][P][S])

unsigned int

Not supported

Not supported

4-byte unsigned integer

(VT_UI4, [T][P])

__int64

Not supported

long

8-byte signed integer

(VT_I8, [T][P])

unsigned __int64

Not supported

Not supported

8-byte unsigned integer

(VT_UI8, [T][P])

float

Single

float

4-byte floating-point number

(VT_R4, [V][T][P][S])

double

Double

double

8-byte floating-point number

(VT_R8, [V][T][P][S])

BSTR

String

java.lang.String

Automation string

(VT_BSTR, [V][T][P][S])

BOOL

Boolean

boolean

Boolean

(VT_BOOL, [V][T][P][S])

VARIANT

Variant

com.ms.com.Variant

VARIANT FAR*

(VT_VARIANT, [V][T][P][S])

IUnknown

object

com.ms.com.IUnknown

IDispatch interface pointer

(VT_DISPATCH, [V][T][P][S])

DATE

Date

com.ms.com.Variant

Date

(VT_DATE, [V][T][P][S])

CURRENCY

Currency

com.ms.com.Variant

Currency

(VT_CY, [V][T][P][S] or VT_DECIMAL, [V][T][S])

 

For information about VARTYPE values and how to use them, see the topic IDispatch Data Types and Structures.

The data type conversions between scripting languages are simpler than those for programming languages. JScript and JavaScript both support the same data types, and VBScript supports only a single data type, Variant. Thus, all JScript and JavaScript data types become Variant types when converted to VBScript. When you convert VBScript to JScript or JavaScript, the Variant types become numbers, strings, Boolean values, and so on.

 

 

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