Alias
Clause of the `Sub` and `Function` statements that provides an alternate internal name
Syntax
`
[Declare] { Sub | Function } usablename Alias "alternatename" (...)
`
Usage
`
declare sub usablename Alias "alternatename" ( ... )
`or`
`
declare function usablename Alias "alternatename" ( ... )
or`
`
sub usablename Alias "alternatename" ( ... )
...
end sub
or`
`
function usablename Alias "alternatename" ( ... )
...
end function
Description
`Alias` gives an alternate name to a procedure. This alternate name cannot be used within the program to call the procedure, but it is visible (if the function is not private) to the linker when linking with code written in other languages.
`Alias` is commonly used for procedures in libraries written in other languages when such procedure names are valid in the other language but invalid in BASIC. When using `Alias` with `Declare`, only the alternate name is used by the linker.
Differently from normal procedure names, `Alias` does not change the case of the alternate name, so it is useful when external code requires an exported function with a particular name or with a particular case.
Example
If there is a sub called `xClearScreen` in an external library and you want to reference it with the name `ClearVideoScreen`, here is sample code to do so:
`
Declare Sub ClearVideoScreen Alias "xClearScreen" ()
`
A procedure meant to be used by external C code, exported as `MyExportedProc`:
`
Function MultiplyByFive cdecl Alias "MyExportedProc" (ByVal Parameter As Integer) As Integer Export
Return Parameter * 5
End Function
`
Differences from QB

- In QB, `Alias` only worked with `Declare`.

See also

- `Declare`
- `Export`