Declare Statement

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

Skatiet arī: FreeLibrary

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

Name: A different name than defined in the DLL, to call the subroutine from LibreOfficeDev Basic.

Aliasname: Name of the subroutine as defined in the DLL.

Libname: File or system name of the DLL. This library is automatically loaded the first time the function is used.

Argumentlist: 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.

Type: 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 ByVal.

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