X# Runtime and VO SDK Reference
X# Runtime and SDK Reference
XSharp.RDD Namespace
DBF Class
DBF Methods
DBF._getMemoBlockNumber Method
DBF.AddField Method
DBF.Append Method
DBF.AppendLock Method
DBF.BlobInfo Method
DBF.ChildEnd Method
DBF.ChildStart Method
DBF.ChildSync Method
DBF.ClearFilter Method
DBF.ClearRel Method
DBF.ClearScope Method
DBF.Close Method
DBF.CloseMemFile Method
DBF.Compile Method
DBF.Continue Method
DBF.Create Method
DBF.CreateMemFile Method
DBF.DbEval Method
DBF.Delete Method
DBF.EvalBlock Method
DBF.EvalFilter Method
DBF.FieldIndex Method
DBF.FieldInfo Method
DBF.FieldName Method
DBF.Flush Method
DBF.ForceRel Method
DBF.GetRec Method
DBF.GetScope Method
DBF.GetValue Method
DBF.GetValueFile Method
DBF.GetValueLength Method
DBF.GoBottom Method
DBF.GoCold Method
DBF.GoHot Method
DBF.GoTo Method
DBF.GoToId Method
DBF.GoTop Method
DBF.HeaderLock Method
DBF.Info Method
DBF.Lock Method
DBF.Open Method
DBF.OpenMemFile Method
DBF.OrderCondition Method
DBF.OrderCreate Method
DBF.OrderDestroy Method
DBF.OrderInfo Method
DBF.OrderListAdd Method
DBF.OrderListDelete Method
DBF.OrderListFocus Method
DBF.OrderListRebuild Method
DBF.Pack Method
DBF.PutRec Method
DBF.PutValue Method
DBF.PutValueFile Method
DBF.Recall Method
DBF.RecInfo Method
DBF.Refresh Method
DBF.RelArea Method
DBF.RelEval Method
DBF.RelText Method
DBF.Seek Method
DBF.SetFieldExtent Method
DBF.SetFilter Method
DBF.SetRel Method
DBF.SetScope Method
DBF.Skip Method
DBF.SkipFilter Method
DBF.SkipRaw Method
DBF.SkipScope Method
DBF.Sort Method
DBF.SyncChildren Method
DBF.Trans Method
DBF.TransRec Method
DBF.UnLock Method
DBF.Zap Method
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DBF.HeaderLock Method

X#
Lock or unlock the header of a database file.

Namespace:  XSharp.RDD
Assembly:  XSharp.Rdd (in XSharp.Rdd.dll) Version: 2.21
Syntax
Copy
 VIRTUAL METHOD HeaderLock(
	lockMode AS DbLockMode
) AS LOGIC
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Parameters

lockMode
Type: DbLockMode

Return Value

Type: Logic
TRUE when the operation succeeded or FALSE when the operation failed.
Some RDD operations do not really return FALSE but throw an exception to indicate failure.
These exceptions are caught in the higher level code and registered in the LastRddError property in the runtime state..

Implements

HeaderLock(DbLockMode)
See Also