Declare Definition

Syntax

[ | Private | Public ] _
Declare Sub name Lib "dll name" _
    [Alias "module name"] [([param[, ...]])]
-or-
[ | Private | Public ] _
Declare Function name[type] Lib "dll name" _
    [Alias "module name"] [([param[, ...]])] [As type[()]]

Group

Declaration

Description

Interface to a DLL defined subroutine or function. The values of the calling arglist are assigned to the params.

WARNING! Be very careful when declaring DLL subroutines or functions. If you make a mistake and declare the parementers or result incorrectly then Windows might halt. Save any open documents before testing new DLL declarations.

Err.LastDLLError returns the error code for that last DLL call.

Access

If no access is specified then Public is assumed.

Pocket PC

Not supported.

Sandbox

Sandbox mode blocks this definiton.

Parameters Description

name This is the name of the subroutine or function being defined. If Alias "module name" is omitted then this is the module name, too.

"dll name" This is the DLL file where the module's code is. If the DLL is in the same directory as the macro/module the expression MacroDir & "dll name" is allowed. This is the only expression other than a string constant which is allowed.

"module name" This is the name of the module in the DLL file. If this is #number then it is the ordinal number of the module. If it is omitted then name is the module name.
The DLL is searched for the specified module name. If this module exists, it is used. All As String parameters are converted from Unicode to ASCII prior to calling the DLL and from ASCII to Unicode afterwards. (Use "Unicode:module name" to prevent ASCII to Unicode conversion.)
If the module does not exist, one or two other module names are tried:
1) The module name with a "W" appended is tried. All As String parameters are passed as Unicode to calling the DLL.
2) The module name with an "A" appended is tried. All As String parameters are converted from Unicode to ASCII prior to calling the DLL and from ASCII to Unicode afterwards.
If none of these module names is found a run-time error occurs.

params A list of zero or more params that are used by the DLL subroutine or function. (Note: A ByVal string's value may be modified by the DLL.)

See Also

Function, Sub, Call

Declare Function GetActiveWindow& Lib "user32" ()
Declare Function GetWindowTextLengthA& Lib "user32" _
    (ByVal hwnd&)
Declare Sub GetWindowTextA Lib "user32" _
    (ByVal hwnd&, ByVal lpsz$, ByVal cbMax&)
 
Function ActiveWindowTitle$()
    ActiveWindow = GetActiveWindow()
    TitleLen = GetWindowTextLengthA(ActiveWindow)
    Title$ = Space$(TitleLen)
    GetWindowTextA ActiveWindow,Title$,TitleLen+1
    ActiveWindowTitle$ = Title$
End Function
 
Sub Main
    Debug.Print ActiveWindowTitle$()
End Sub

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Parameters	Description
name	This is the name of the subroutine or function being defined. If Alias "module name" is omitted then this is the module name, too.
"dll name"	This is the DLL file where the module's code is. If the DLL is in the same directory as the macro/module the expression MacroDir & "dll name" is allowed. This is the only expression other than a string constant which is allowed.
"module name"	This is the name of the module in the DLL file. If this is #number then it is the ordinal number of the module. If it is omitted then name is the module name. The DLL is searched for the specified module name. If this module exists, it is used. All As String parameters are converted from Unicode to ASCII prior to calling the DLL and from ASCII to Unicode afterwards. (Use "Unicode:module name" to prevent ASCII to Unicode conversion.) If the module does not exist, one or two other module names are tried: 1) The module name with a "W" appended is tried. All As String parameters are passed as Unicode to calling the DLL. 2) The module name with an "A" appended is tried. All As String parameters are converted from Unicode to ASCII prior to calling the DLL and from ASCII to Unicode afterwards. If none of these module names is found a run-time error occurs.
params	A list of zero or more params that are used by the DLL subroutine or function. (Note: A ByVal string's value may be modified by the DLL.)