i would like to find the primary key of a table and i write it, but it
doesnt work

String *aaa[] = {String::Empty,String::Empty,tablename};

rs =
connection->OpenSchema(ADODB::SchemaEnum::adSchemaPrimaryKeys,aaa,String::Empty);

Is there any problems?

thanks

it said that argument is of wrong type , are out of the acceptable
range or are in conflict with another object

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