Operator VARPTR (Variable pointer)

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgOpVarptr
• Last revised: 2016-12-16

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Returns the address of a variable or object

Syntax

` declare operator Varptr ( byref lhs as T ) as T ptr

`

Syntax

` result = Varptr ( lhs )

`

Parameters

lhs

A variable or object.

T

Any data type.

Return Value

Returns the address of a variable or object.

Description

This operator returns the address of its operand.

When the operand is of type String, the address of the internal string descriptor is returned. Use Operator Strptr (String pointer) to retrieve the address of the string data.

The operand cannot be an array, but may be an array element. For example, "Varptr(myarray(0))" returns the address of "myarray(0)".

Operator @ (Address of), when used with variables or objects, has identical behavior.

Examples

start GeSHi

Dim a As Integer, addr As Integer
a = 10

'' place the address of a in addr
addr = CInt( VarPtr(a) )

'' change all 4 bytes (size of INTEGER) of a
Poke Integer, addr, -1000
Print a

'' place the address of a in addr (same as above)
addr = CInt( @a )

'' print the least or most significant byte, depending on the CPU endianess
Print Peek( addr )

end GeSHi

Differences from QB

• None

See also

• Pointers
• Peek
• Poke

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