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

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

Namespace:  XSharp.RDD
Assembly:  XSharp.Core (in XSharp.Core.dll) Version: 2.19
Syntax
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METHOD HeaderLock(
	uiMode AS DbLockMode
) AS LOGIC
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Parameters

uiMode
Type: DbLockMode
An enum value specifying the kind of lock to acquire.

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..
See Also