Conversion from _variant_t to long (or char*)

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5.00/5 (1 vote)

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Hello all,

I have written a code in VC++ 6.0,which fires a query to database against ADODB connection & feteches a int data in _variant_t var object.

C++

_variant_t var;
var = recordset->Fields->GetItem(L"id")->GetValue();

Now, I want to store this "id" value in a long array.For this I need to convert the value in var to long.
I tried storing var.lVal in the array but dint worked. Another option I can see is to convert var to char* & then use atol() to convert to long.

How to achieve either of the conversion (i.e. to long or to char*)?

Thanks.

Posted 10-Aug-10 4:13am

bsaurabh

Updated 10-Aug-10 4:19am

Sandeep Mewara

v2

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Electron Shepherd · Answer 1 · 2010-08-10T04:33:00

Solution 1

Either look at the type (the vt field), and then read the relevant field in the underlying VARIANT structure, or use one of the accessor functions[^].

Since the accessors may call VariantChangeType, you may not get the results you expect. Looking at the vt field is the more robust way to go.

Posted 10-Aug-10 4:33am

Electron Shepherd

Comments

Nish Nishant 10-Aug-10 12:10pm

Reason for my vote of 5
Proposed answer.