Private Declare Function Vba

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Used at the module level to declare references to external procedures in a dynamic-link library (DLL).
Declare statements with the PtrSafe keyword is the recommended syntax. Declare statements that include PtrSafe work correctly in the VBA version 7 development environment on both 32-bit and 64-bit platforms only after all data types in the Declare statement (parameters and return values) that need to store 64-bit quantities are updated to use LongLong for 64-bit integrals or LongPtr for pointers and handles. To ensure backwards compatibility with VBA version 6 and earlier, use the following construct:
[ Public | Private ] Declare Sub name Lib "libname" [ Alias "aliasname" ] [ ( [ arglist ] ) ]
[ Public | Private ] Declare Function name Lib "libname" [ Alias "aliasname" ] [ ( [ arglist ] ) ] [ As type ]
For code to run in 64-bit versions of Microsoft Office, all Declare statements must include the PtrSafe keyword, and all data types in the Declare statement (parameters and return values) that need to store 64-bit quantities must be updated to use LongLong for 64-bit integrals or LongPtr for pointers and handles.
[ Public | Private ] Declare PtrSafe Sub name Lib "libname" [ Alias "aliasname" ] [ ( [ arglist ] ) ]
[ Public | Private ] Declare PtrSafe Function name Lib "libname" [ Alias "aliasname" ] [ ( [ arglist ] ) ] [ As type ]
Optional. Used to declare procedures that are available to all other procedures in all modules.
Optional. Used to declare procedures that are available only within the module where the declaration is made.
Required on 64-bit. The PtrSafe keyword asserts that a Declare statement is safe to run in 64-bit versions of Microsoft Office.
Optional (either Sub or Function must appear). Indicates that the procedure doesn't return a value.
Optional (either Sub or Function must appear). Indicates that the procedure returns a value that can be used in an expression.
Required. Any valid procedure name. Note that DLL entry points are case-sensitive.
Required. Indicates that a DLL or code resource contains the procedure being declared. The Lib clause is required for all declarations.
Required. Name of the DLL or code resource that contains the declared procedure.
Optional. Indicates that the procedure being called has another name in the DLL. This is useful when the external procedure name is the same as a keyword. You can also use Alias when a DLL procedure has the same name as a public variable, constant, or any other procedure in the same scope. Alias is also useful if any characters in the DLL procedure name aren't allowed by the DLL naming convention.
Optional. Name of the procedure in the DLL or code resource. If the first character is not a number sign (#), aliasname is the name of the procedure's entry point in the DLL. If (#) is the first character, all characters that follow must indicate the ordinal number of the procedure's entry point.
Optional. List of variables representing arguments that are passed to the procedure when it is called.
Optional. Data type of the value returned by a Function procedure; may be Byte, Boolean, Integer, Long, LongLong, LongPtr, Currency, Single, Double, Decimal (not currently supported), Date, String (variable length only), Variant, a user-defined type, or an object type. (LongLong is a valid declared type only on 64-bit platforms.)
The arglist argument has the following syntax and parts:
[ Optional ] [ ByVal | ByRef ] [ ParamArray ] varname [ ( ) ] [ As type ]
Optional. Indicates that an argument is not required. If used, all subsequent arguments in arglist must also be optional and declared by using the Optional keyword. Optional can't be used for any argument if ParamArray is used.
Optional. Indicates that the argument is passed by value.
Indicates that the argument is passed by reference. ByRef is the default in Visual Basic.
Optional. Used only as the last argument in arglist to indicate that the final argument is an Optional array of Variant elements. The ParamArray keyword allows you to provide an arbitrary number of arguments. The ParamArray keyword can't be used with ByVal, ByRef, or Optional.
Required. Name of the variable representing the argument being passed to the procedure; follows standard variable naming conventions.
Required for array variables. Indicates that varname is an array.
Optional. Data type of the argument passed to the procedure; may be Byte, Boolean, Integer, Long, LongLong, LongPtr, Currency, Single, Double, Decimal (not currently supported), Date, String (variable length only), Object, Variant, a user-defined type, or an object type. (LongLong is a valid declared type only on 64-bit platforms.)
If you include an argument list, the number and type of arguments are checked each time the procedure is called. The following example takes one Long argument:
This example shows how the Declare statement is used at the module level of a standard module to declare a reference to an external procedure in a dynamic-link library (DLL). You can place the Declare statements in class modules if the Declare statements are Private.
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Glossary of terms for Visual Basic Editor (VBE).
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Used at the module level to declare private variables and allocate storage space.
Private [ WithEvents ] varname [ ( [ subscripts ] ) ] [ As [ New ] type ]
[ , [ WithEvents ] varname [ ( [ subscripts ] ) ] [ As [ New ] type ]] . . .
The Private statement syntax has these parts:
Optional. Keyword that specifies that varname is an object variable used to respond to events triggered by an ActiveX object. WithEvents is valid only in class modules. You can declare as many individual variables as you like by using WithEvents, but you can't create arrays with WithEvents, nor can you use New with WithEvents.
Required. Name of the variable; follows standard variable naming conventions.
Optional. Dimensions of an array variable; up to 60 multiple dimensions may be declared. The subscripts argument uses the following syntax:
[ lowerTo ] upper [ , [ lowerTo ] upper ] . . .
When not explicitly stated in lower, the lower bound of an array is controlled by the Option Base statement. The lower bound is zero if no Option Base statement is present.
Optional. Keyword that enables implicit creation of an object. If you use New when declaring the object variable, a new instance of the object is created on first reference to it, so you don't have to use the Set statement to assign the object reference. The New keyword can't be used to declare variables of any intrinsic data type. It also can't be used to declare instances of dependent objects, and it can't be used with WithEvents.
Optional. Data type of the variable; may be Byte, Boolean, Integer, Long, Currency, Single, Double, Decimal (not currently supported), Date, String (for variable-length strings), String length (for fixed-length strings), Object, Variant, a user-defined type, or an object type. Use a separate As type clause for each variable being defined.
Private variables are available only to the module in which they are declared.
Use the Private statement to declare the data type of a variable. For example, the following statement declares a variable as an Integer:
You can also use a Private statement to declare the object type of a variable. The following statement declares a variable for a new instance of a worksheet:
If the New keyword isn't used when declaring an object variable, the variable that refers to the object must be assigned an existing object by using the Set statement before it can be used. Until it's assigned an object, the declared object variable has the special value Nothing, which indicates that it doesn't refer to any particular instance of an object.
If you don't specify a data type or object type, and there is no Deftype statement in the module, the variable is Variant by default.
You can also use the Private statement with empty parentheses to declare a dynamic array. After declaring a dynamic array, use the ReDim statement within a procedure to define the number of dimensions and elements in the array. If you try to redeclare a dimension for an array variable whose size was explicitly specified in a Private, Public, or Dim statement, an error occurs.
When variables are initialized, a numeric variable is initialized to 0, a variable-length string is initialized to a zero-length string (""), and a fixed-length string is filled with zeros. Variant variables are initialized to Empty. Each element of a user-defined type variable is initialized as if it were a separate variable.
The Private statement cannot be used inside a procedure; use the Dim statement to declare local variables.
This example shows the Private statement being used at the module level to declare variables as private; that is, they are available only to the module in which they are declared.
Have questions or feedback about Office VBA or this documentation? Please see Office VBA support and feedback for guidance about the ways you can receive support and provide feedback.
Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy.
Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy.
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Private Declare Function Vba
























































