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TADODataSet that is passed to OpenSchema should be initialized and 
EmptyParam should be instead of NULL:

 OleVariant EmptyParam;
 EmptyParam.VType  = VT_ERROR;
 EmptyParam.VError = DISP_E_PARAMNOTFOUND;

 TADODataSet * DS = new TADODataSet(this);
 Conn->OpenSchema(siColumns, EmptyParam, EmptyParam, DS);
 //do not forget to free DS

//------------------------------------------
Regards,
Vassiliev V. V.
http://www.managed-vcl.com - using .Net objects in Delphi for Win32 +
ADO.Net
http://www.oledbdirect.com - The fastest way to access MS SQL Server,
MS Jet (Access) and Interbase (through OLEDB)



"Mike K" <nospam@nospam.net> ???????/???????? ? ???????? ?????????: 
news:46d46ae6$1@newsgroups.borland.com...
> Sorry to need the handholding, but this code:
>
> TADODataSet *DS;
> Conn->OpenSchema(siColumns,NULL,NULL,DS);
>
> returns the error: "arguments are of the wrong type, are out of acceptable 
> range, or are in conflict with one another."
>
> I see that at design time I can open a dataset with a SELECT * query and 
> then have access to FieldDefs, which gives me the field data I need. How 
> do I get this data at runtime? I see GetIndexDefs() as a method, but 
> nothing for FieldDefs.
>
>
>
>
> Vassiliev V. V. wrote:
>> Look at TADOConnection::OpenSchema(). You need schema siColumns.
>>
>> //------------------------------------------
>> Regards,
>> Vassiliev V. V.
>> http://www.managed-vcl.com - using .Net objects in Delphi for Win32 +
>> ADO.Net
>> http://www.oledbdirect.com - The fastest way to access MS SQL Server,
>> MS Jet (Access) and Interbase (through OLEDB)
>>
>>
>> "Mike K" <nospam@nospam.net> ???????/???????? ? ???????? ?????????: 
>> news:46d3828b$1@newsgroups.borland.com...
>>> I'm building a database converter that needs to know the field data 
>>> types for every table.
>>>
>>> How is this done? I can use GetTableNames() and GetFieldNames() but I 
>>> still need the data types for each field.
>>>
>>> (Using BCB 5)
>>>
>>> thanks for any help...
>>>
>>