CVLONGINT

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgCvlongint
• Last revised: 2017-11-21

---

Converts a double-precision floating-point number or eight-byte string to a Longint variable

Syntax

declare function Cvlongint ( byval dbl as double ) as longint
declare function Cvlongint ( byref str as const string ) as longint

Usage

result = Cvlongint( dbl )
result = Cvlongint( str )

Parameters

dbl

A Double floating-point number with a binary copy of a Longint variable stored in it.

str

A String at least eight bytes in length with a binary copy of a Longint variable stored in it.

Return Value

A Longint variable holding a binary copy of the input variable.

Description

Returns a 64-bit Longint value using the binary data contained in a Double, or a String of at least eight bytes in length. A value of zero (0) is returned if the string is less than eight bytes in length.

Cvlongint is used to convert 8-byte strings created with Mklongint.

This function can also be used to convert 64-bit integer values from a memory or file buffer without the need for a Type structure. However, just as with the type structure, special care should be taken when using Cvlongint to convert strings that have been read from a buffer.

Examples

start GeSHi

Dim ll As LongInt, s As String
s = "ABCDEFGH"
ll = CVLongInt(s)
Print Using "s = ""&"""; s
Print Using "ll = _&H&"; Hex(ll)

end GeSHi

Differences from QB

• In QB an error occurs if the string passed is less than eight bytes in length.
• QB did not support floating-point arguments.

See also

• Mklongint
• Cvshort
• Cvi
• Cvl

Back to DocToc