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# Declare Statement

Declares and defines a subroutine in a DLL file that you want to execute from LibreOfficeDev Basic.

See also: FreeLibrary

### Syntax:

    Declare {Sub | Function} Name Lib "Libname" [Alias "Aliasname"] [Argumentlist] [As Type]

### Parameters:

\<emph\>Name:\</emph\> A different name than defined in the DLL, to call the subroutine from LibreOfficeDev Basic.

\<emph\>Aliasname\</emph\>: Name of the subroutine as defined in the DLL.

\<emph\>Libname:\</emph\> File or system name of the DLL. This library is automatically loaded the first time the function is used.

\<emph\>Argumentlist:\</emph\> List of parameters representing arguments that are passed to the procedure when it is called. The type and number of parameters is dependent on the executed procedure.

\<emph\>Type:\</emph\> Defines the data type of the value that is returned by a function procedure. You can exclude this parameter if a type-declaration character is entered after the name.

To pass a parameter to a subroutine as a value instead of as a reference, the parameter must be indicated by the keyword \<emph\>ByVal\</emph\>.

### Example:

    Declare Sub MyMessageBeep Lib "user32.dll" Alias "MessageBeep" ( Long )
    Sub ExampleDeclare
    Dim lValue As Long
        lValue = 5000
        MyMessageBeep( lValue )
        FreeLibrary("user32.dll" )
    End Sub

## Example 2

      REM When passing arrays by reference, do not specify the type of its elements.
      Declare Function GetDiag Lib "C:\\...\\Math.dll" _
         Alias "GetDiag" ( _
         ByVal varName As String, _
         A, _
         ByVal len As Long, _
         ByVal FunctionName As String, _
         B, _
         C) As Long
    Sub MyCode
      Dim A(100) As Long, B(100) As Long, C(100) As Long ' arrays
      R = GetDiag("f", A, 100, "g", B, C)
      Print R
    End Sub

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