D2000 VBApi - Work with the current object value

The interface D2000 VBApi allows to get the current object value and modify it. Before getting the value or its modification, it is necessary to open the particular object (VBApiOpenObject).

Getting the value of an object is performed by calling the procedure VBApiGetObjectValue.

Declaration
 Declare Sub VBApiGetObjectValue Lib "vbapi.dll" Alias "_GetObjectValue@12" (ByRef name As String, ByRef unival As VBApi_TUniVal, ByRef ok As Long)

Parameters
name Name of open object.
unival Structure that represents the current object value.
ok Return value - call success.

Return value
Value of the parameter ok.
 
Return value Description
0 Successful call. The parameter unival contains the current object value.
1 Incorrect object name (also in case, that the object is not opened).
2 No logged on user.
3 Unexpected internal error.
4 Incorrect parameters.


Setting the value of an object is performed alike by calling the procedure VBApiChangeObjValue. It is possible to set a value of the object of User variable type.

Declaration
Declare Sub VBApiChangeObjValue Lib "vbapi.dll" Alias "_ChangeObjValue@12" (ByRef name As String, ByRef unival As VBApi_TUniVal, ByRef ok As Long)

Parameters
name Name of open object.
unival Structure representing the current object value.
ok Return value - call success.

Return value
Value of the parameter ok.

Return value Description
0 Calling successful. The parameter unival contains the current object value.
1 Incorrect object name (also in case, that the object is not opened)
2 No logged on user.
3 Unexpected internal error.
4 Incorrect parameters.

Description
When setting the value, there is checked the value type (unival) that must be equal with the current value type of the particular object (user variable).
Note
It is suitable to implement a modification of the current value, in regard to a lot of items in the structure VBApi_TUniVal, in such a way that you should detect the current value at first (to fill the structure), carry out the required modifications and then call the procedure VBApiChangeObjValue.

Access to an item of an object of Value array type

To get the items' values of Value array type object use the function VBApiGetArrObjectValue. Compared to the function VBApiGetObjectValue, there are two extra parameters - index of required value and the indicator of exceeded array size (index).

Declaration
Declare Sub VBApiGetArrObjectValue Lib "vbapi.dll" Alias "_GetArrObjectValue@20" (ByRef name As String, ByRef unival As VBApi_TUniVal, ByVal index As Long, ByRef bOutOfRange As Long, ByRef ok As Long)

Parameters
name Name of open object.
unival Structure representing the current object value.
index Index of required array item.
bOutOfRange Out-of-limit attribute.
ok Return value - call success.

Return value
Value of the parameter ok.

Return value Description
0 Calling successful. The parameter unival contains the current object value.
1 Incorrect object name (also in case, that the object is not opened)
2 No logged on user.
3 Unexpected internal error.
4 Incorrect parameters.

Note
If the parameter name is the name of an object, that is not Array type, and the parameter index  = 1, then calling the function is performed successfully and returns the object value. The function VBApiGetArrObjectValue therefore can substitute the function VBApiGetObjectValue.

Access to an item of an object of Structured variable type

To get the items' values of Structured variable object use the function VBApiGetRecItemObjectValue. Compared to the function VBApiGetArrObjectValue, there is one extra parameter to enter the name of an item of the structure itemName.

Declaration
Declare Sub VBApiGetRecItemObjectValue Lib "vbapi.dll" Alias "_GetRecItemObjectValue@24" (ByRef name As String, ByRef unival As VBApi_TUniVal, ByVal index As Long, ByRef itemName As String, ByRef bOutOfRange As Long, ByRef ok As Long)

Parameters
name Name of open object.
unival Structure representing the current object value.
index Index of required array item.
itemName Name of structure item.
bOutOfRange Out-of-limit attribute.
ok Return value - call success.

Return value
Value of the parameter ok.

Return value Description
0 Calling successful. The parameter unival contains the current object value.
1 Incorrect object name (also in case, that the object is not opened)
2 No logged on user.
3 Unexpected internal error.
4 Incorrect parameters.

Related pages:

D2000 VBApi

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