Procedures and Functions

Warning

Work in Progress

A

Abs – returns the absolute value of a number
AllocMem – allocates a block of native memory and returns its address
AppActivate – activates an application window
Array – creates a Variant array from a comma-separated list of values, or destructures one when used on the left of an assignment
Asc, AscB, AscW – returns the character code of the first letter in a string
Atn – returns the arctangent of a number

B

Beep – sounds a tone through the computer’s speaker

C

Calendar – returns or sets the calendar type (Gregorian or Hijri)
CallByDispId – invokes a method or property on an object dynamically by IDispatch dispatch ID
CallByName – invokes a method or property on an object dynamically by name
CBool – coerces an expression to a Boolean
CByte – coerces an expression to a Byte
CCur – coerces an expression to a Currency
CDate – coerces an expression to a Date
CDbl – coerces an expression to a Double
CDec – coerces an expression to a Decimal
ChDir – changes the current directory or folder
ChDrive – changes the current drive
CurDir – returns the current path
Choose – returns one value from a list, selected by 1-based index
Chr$, Chr, ChrB$, ChrB, ChrW$, ChrW – returns the character associated with a given character code
CInt – coerces an expression to an Integer
CLng – coerces an expression to a Long
CLngLng – coerces an expression to a LongLong
CLngPtr – coerces an expression to a LongPtr
Command$, Command – returns the command-line arguments passed to the program
CompilerVersion – returns the twinBASIC compiler version number
ConvertIconToBitmap – converts an icon picture to a bitmap picture
Cos – returns the cosine of an angle
CreateGUID – generates a fresh GUID and returns it as a registry-formatted string
CreateObject – creates a new instance of a COM/Automation object
CreateStdPictureFromHandle – wraps a GDI bitmap or icon handle in an stdole.StdPicture
CSng – coerces an expression to a Single
CStr – coerces an expression to a String
CType – generic type conversion supporting the CType(Of type) cast operator
CurrentComponentCLSID – returns the Class ID (CLSID) of the current class
CurrentComponentName – returns the name of the current component (module or class)
CurrentProcedureName – returns the name of the procedure in which the function is called
CurrentProjectName – returns the name of the current project
CurrentSourceFile – returns the full path of the current source file
CVar – coerces an expression to a Variant
CVDate – coerces an expression to a Variant of subtype Date
CVErr – coerces a numeric expression to a Variant of subtype Error

D

Date – sets or returns the current system date
DateAdd – adds a time interval to a date
DateDiff – returns the number of time intervals between two dates
DatePart – returns a specified part of a given date
DateSerial – returns a date for a specified year, month, and day
DateValue – converts a string to a date
Day – returns the day of the month from a date value
DDB – returns the depreciation of an asset via the double-declining balance method
DeleteSetting – deletes a section or key setting from an application’s entry in the Windows registry
Dir – returns the name of a file, directory, folder, or volume label that matches a pattern
DoEvents – yields control to the message loop so pending events can be processed

E

Emit – injects custom Byte values into the codegen stream of the enclosing procedure
EmitAny – injects custom typed values into the codegen stream of the enclosing procedure
Environ$, Environ – returns the value of a process environment variable
EOF – returns whether the end of a file has been reached
Erl – returns the line number where the most recent run-time error occurred
Err – returns the ErrObject describing the current run-time error state
Error$, Error – returns the error message that corresponds to a given error number
Eval – compiles and evaluates a twinBASIC expression supplied as a string
Exp – returns e (the base of natural logarithms) raised to a power

F

FileAttr – returns the file mode for files opened with the Open statement
FileCopy – copies a file
FileDateTime – returns the date and time when a file was created or last modified
FileLen – returns the length of a file in bytes
Filter – filters a string array into a subset according to criteria
Fix – returns the integer portion of a number, truncating toward zero
Format$, Format – formats an expression according to instructions contained in a format expression
FormatCurrency – formats an expression as a currency value
FormatDateTime – formats an expression as a date or time
FormatNumber – formats an expression as a number
FormatPercent – formats an expression as a percentage
FreeFile – returns the next file number available for use by the Open statement
FreeMem – frees memory allocated with AllocMem
FV – returns the future value of an annuity based on periodic fixed payments and a fixed interest rate

G

GetAllSettings – returns every key/value pair in a section of an application’s registry entry
GetAttr – returns the attributes of a file or directory
GetMem1 – reads one byte from a memory address into a Byte variable
GetMem2 – reads two bytes from a memory address into an Integer variable
GetMem4 – reads four bytes from a memory address into a Long variable
GetMem8 – reads eight bytes from a memory address into a Currency variable
GetMemPtr – reads a pointer-sized value from a memory address into a LongPtr variable
GetObject – returns a reference to an Automation object loaded from a file or already running
GetSetting – returns a string key setting value from an application’s entry in the Windows registry

H

Hex$, Hex – returns a string representing the hexadecimal value of a number
Hour – returns the hour of the day from a time value

I

If – evaluates an expression and returns one of two values, with short-circuit evaluation
IIf – evaluates an expression and returns one of two values; both branches are always evaluated
IMEStatus – returns the status of the Input Method Editor
Input, Input$ – reads a fixed number of characters from an open sequential file
InputB, InputB$ – reads a fixed number of bytes from an open sequential file
InputBox – prompts the user for a line of text and returns what was entered
InStr$, InStrB, InStr – returns the position of one string within another
InStrRev – returns the position of one string within another, searching from the end
Int – returns the integer portion of a number, rounding toward negative infinity
IPmt – returns the interest payment for a given period of an annuity
IRR – returns the internal rate of return for a series of periodic cash flows
IsArray – returns whether a variable is an array
IsArrayInitialized – returns whether an array has been dimensioned
IsDate – returns whether an expression can be evaluated as a date
IsEmpty – returns whether a Variant is uninitialised
IsError – returns whether an expression is an error subtype
IsMissing – returns whether an optional argument was supplied
IsNull – returns whether a variable contains a Null value
IsNumeric – returns whether an expression can be evaluated as a number
IsObject – returns whether a variable refers to an object

J

Join – concatenates a string array using a given delimiter

K

Kill – deletes files from a disk

L

LBound – returns the smallest valid subscript for a dimension of an array
LCase$, LCase – returns a string converted to lowercase
Left$, Left, LeftB$, LeftB – returns the leftmost characters from a string
Len, LenB – returns the length of a string, or the storage size of a variable
Load – loads an object (typically a form) into memory without showing it
Loc – returns the current read/write position within an open file
LOF – returns the size, in bytes, of an open file
Log – returns the natural (base e) logarithm of a number
LTrim$, LTrim – removes leading spaces from a string

M

MacID – on the Macintosh, converts a 4-character constant to a value usable by Dir, Kill, Shell, or AppActivate
Mid$, Mid, MidB$, MidB – returns a substring of a string
Minute – returns the minute of the hour from a time value
MIRR – returns the modified internal rate of return for a series of periodic cash flows
MkDir – creates a new directory or folder
Month – returns the month of the year from a date value
MonthName – returns the name of the specified month
MsgBox – displays a modal message dialog and returns the button the user clicked

N

Name – renames a disk file, directory, or folder
NPer – returns the number of periods for an annuity based on periodic fixed payments and a fixed interest rate
NPV – returns the net present value of an investment based on a series of periodic cash flows and a discount rate
Now – returns the current system date and time
Nz – replaces a Null value with a specified replacement value

O

ObjPtr – returns the COM-identity address of an object
Oct$, Oct – returns a string representing the octal value of a number

P

Partition – returns a string identifying the range a number falls into
PictureToByteArray – serialises an IPicture into a Byte array
Pmt – returns the payment for an annuity based on periodic fixed payments and a fixed interest rate
PPmt – returns the principal payment for a given period of an annuity
ProcessorArchitecture – returns the processor architecture of the running application
PutMem1 – writes one byte to a memory address
PutMem2 – writes two bytes to a memory address
PutMem4 – writes four bytes to a memory address
PutMem8 – writes eight bytes to a memory address
PutMemPtr – writes a pointer-sized value to a memory address
PV – returns the present value of an annuity based on periodic fixed payments and a fixed interest rate

Q

QBColor – returns the RGB colour value for a QuickBASIC colour index

R

RaiseEventByName – raises an event by name on an object, taking arguments as a Variant array
RaiseEventByName2 – raises an event by name on an object, taking a variable-length argument list
Randomize – initializes the random-number generator
Rate – returns the interest rate per period for an annuity
Replace – replaces a substring within a string with another substring
Reset – closes all disk files opened by using the Open statement
RGB – builds an RGB colour value from red, green, and blue components
RGBA – builds an RGBA colour value from red, green, blue, and alpha components
RGBA_A – returns the alpha component of an RGBA colour value
RGB_B – returns the blue component of an RGB colour value
RGB_G – returns the green component of an RGB colour value
RGB_R – returns the red component of an RGB colour value
Right$, Right, RightB$, RightB – returns the rightmost characters from a string
RmDir – removes an existing directory or folder
Rnd – returns a pseudo-random number in the range [0.0, 1.0)
Round – rounds a number to a specified number of decimal places
RTrim$, RTrim – removes trailing spaces from a string

S

SavePicture – saves a graphic from a Picture or Image to a file
SaveSetting – saves or creates an application entry in the application’s entry in the Windows registry
Second – returns the second of the minute from a time value
Seek – returns or sets the read/write position within an open file
SendKeys – sends keystrokes to the active window
SetAttr – sets attribute information for a file
Sgn – returns a value indicating the sign of a number
Shell – runs another program asynchronously and returns its task ID
Sin – returns the sine of an angle
SLN – returns the straight-line depreciation of an asset for a single period
Space$, Space – returns a string of spaces
Split – splits a string into a string array
Sqr – returns the square root of a number
Str$, Str – returns the string representation of a number
StrComp – compares two strings
StrConv – converts a string to a specified format
String$, String – returns a string of repeating characters
StrPtr – returns the address of the underlying buffer of a String
StrReverse – reverses the order of characters in a string
Switch – returns the value paired with the first True condition in a list of (condition, value) pairs
SYD – returns the sum-of-years’ digits depreciation of an asset for a specified period

T

Tan – returns the tangent of an angle
Time – sets or returns the current system time
Timer – returns the number of seconds elapsed since midnight
TimeSerial – returns a time for a specific hour, minute, and second
TimeValue – converts a string to a time
TranslateColor – translates an OLE colour value to a plain RGB colour value
Trim$, Trim – removes leading and trailing spaces from a string
TypeName – returns the name of a variable’s data type as a String

U

UBound – returns the largest valid subscript for a dimension of an array
UCase$, UCase – returns a string converted to uppercase
Unload – removes an object (typically a form) from memory

V

Val – parses a string into a Double
ValDec – parses a string into a Decimal
VarPtr – returns the address of a variable
VarType – returns the VbVarType enumeration value identifying a variable’s subtype
vbaCastObj – returns an object reinterpreted as another COM interface
vbaCopyBytes – copies a block of bytes from one address to another
vbaCopyBytesZero – copies a block of bytes from one address to another, then zeros the source
vbaObjAddref – increments the COM reference count of an object at a given address
vbaObjSet – assigns an object pointer to an object variable, releasing any prior reference
vbaObjSetAddref – assigns an object pointer to an object variable, adding a reference and releasing any prior reference

Procedures and Functions

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C

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