return array from com object
I want to pass a list of alarm names from COM to VBScript used in ASP pages. If the method name is GetAlarms
, What would be the signature of the method?. The number of alarms returned by Ge开发者_运维技巧tAlarms
will vary.
Does VBScrip support Safe Array?
The declaration in the *.idl file would look like this:
[id(1)] HRESULT GetAlarms([out,retval] SAFEARRAY(VARIANT)* pAlarms);
The corresponding C++ method would look like this:
STDMETHODIMP CMyClass::GetAlarms(SAFEARRAY** pAlarms)
{
CComSafeArray<VARIANT> alarms(3);
CComVariant value;
value = L"First Alarm";
alarms.SetAt(0, value);
value = L"Second Alarm";
alarms.SetAt(1, value);
value = L"Third Alarm";
alarms.SetAt(2, value);
*pAlarms = alarms.Detach();
return S_OK;
}
And finally, here is a sample VBScript that uses the above method:
Set obj = CreateObject("MyLib.MyClass")
a = obj.GetAlarms
For i = 0 To UBound(a)
MsgBox a(i)
Next
In ASP, of course, you would use something else instead of MsgBox
.
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