Question

SAFEARRAY Question

Asked by: VCGuru

Hi,
I have a question regarding the usage of SAFEARRAY.

I have a dll in Visual Basic that has a method as below

Public Sub GetTrials(strTrial() As String, strOutput() As String)
    Dim ii As Integer
    ReDim strTrial(0)
    ReDim strOutput(0)
   
    For ii = 0 To 4
        ReDim Preserve strTrial(ii)
        ReDim Preserve strOutput(ii)
        strTrial(ii) = CStr(ii)
       
        strOutput(ii) = "Tools Group " & ii + 1
        'MsgBox ii
    Next ii
End Sub


The Idl file that is shown in the OLE-COM viewer has the following decleration for the above method

HRESULT GetTrials([in, out] SAFEARRAY(BSTR)* strTrial,
in, out] SAFEARRAY(BSTR)* strOutput);
id(0x60030002)]

I have a Dialog based application. On click of a button, I need to call the method GetTrials and receive the strTrial and strOutput values. How do I do it.


I am able to establish the connection to the dll and access other methods. I don't know how to handle this specific function.

Thanks in advance

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Asked On
2002-02-14 at 23:20:56ID20267209
Tags

redim

,

safearray

,

usage

Topics

Windows MFC Programming

,

Microsoft Programming

Participating Experts
3
Points
60
Comments
7

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Answers

 

by: job_sPosted on 2002-02-15 at 01:04:03ID: 6803618

U can use the parameter as a VARIENT *

and fill the type of Vaient as Array.

 

by: ekcPosted on 2002-02-15 at 05:40:27ID: 6803850

I suppose you are using MFC.
In that case, you can use the class COleSafeArray to work with safe arrays... This class hides SAFEARRAY complexity providing methods from creating new empty elements (Create()), initialize them from different types (including SAFEARRAY - this will probably interest you), add values, and finnaly copy its contents back to SAFEARRAY (Copy() - this will also be of interest to you).
Try some reading in MSDN about this class, it will do the job.

 

by: VCGuruPosted on 2002-02-16 at 02:50:17ID: 6804977

Hi I have never used this stuff before. Some sample code related to the problem statement in my question would be great help. I'll increase the point accordingly

 

by: MGlobalPosted on 2002-02-25 at 01:17:18ID: 6824024

Dear VCGuru,

Your dll in VB must be a COM dll. To call a method of COM dll(from VB project):
+You must make reference to that COM dll.
+New an object of that class then call method of that object.
Ex:
   Dim myObj as MyCOMDll.MyClass
   Set myObj = new MyCOMDll.MyClass
   Call myObj.GetTrials(...)
 
Cheers,
MGlobal

20120131-EE-VQP-002

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