Problem: Saving COleVariant fields in CDaoRecordset

[Emster]

HI,

I am having a problem saving, retrieving and searching on fields in my dao recordset (Access database). I am saving a number of text fields into a table in the following manner:

m_pRecordset->SetFieldValue(m_Fields[i].cFieldName, cElements[i]);

Where cElements is an array of COleVariants ... each one being converted from a CString in the following way:

CString field1("test");
varArray[0] = COleVariant(field1);

The fields are all added fine, but when I open the database in Access they appear only as one character. eg: For the 'test' example, the field appears as 't' only. When I retrieve the strings from the database using the following code:

m_pRecordset->GetFieldValue(cFieldName, temp);
CString field1 = (CString)temp.bstrVal;

I get the full field value of 'test'. So - this is seems alright, although I could not work out why only the one character is seen in Access.

When I go to search on the field however, I run into problems. I can never find the record whose key value = 'test' because it appears to be comparing it to 't' rather than the full string.

Is this clear? Can anyone help with this issue?

thanks,
Em

[Emster]

Hi - Just wondering if anyone has experienced this problem before? I have not been able to resolve it yet and have tried many different options.

I tried inserting strings into the database fields, rather than variants - this worked fine, but then I could not access the contents again!

If anyone could help I'd be most appreciative.

thanks,
Em

[rxbagain]

The CRecordset treats BSTR as byte array, not as real BSTRs. To store the string correctly, use this code

CString field1("test");
VARIANT variant;
::VariantInit(&variant);
variant.vt = VT_BSTR;
variant.bstrVal = ::SysAllocStringByteLen((LPCTSTR)field1, field1.GetLength());
varArray[0] = COleVariant(variant);
::VariantClear(&variant);

We converted the CString to BSTR but the BSTR should still be in ANSI form.

To get it from the database

m_pRecordset->GetFieldValue(cFieldName, temp);
CString field1 = (LPCTSTR)temp.bstrVal;

We placed the value of temp.bstrVal simply by typecasting it to LPCTSTR to avoid conversion of UNICODE to ANSI since we saved the value as an ANSI BSTR.

Hope it will help you

[Emster]

rxbagain - thank you so much
the code works wonderfully,

I really appreciate your help!
Emelia