Detecting record lock in Paradox Table

How about this:

Write a function that accepts the TDataSet name as a parameter and will return a TRUE value if the record is locked.

Then try and place the dataset in edit mode within a try except error handler. You could analyse the error in more detail to trap specifically for a situation where the record is locked. This function will however tell you if it is possible the allow the edit or not.

Example:

function IsLocked(TheDataSet: TDataSet): Boolean;
begin
   Result := False;
   try
     TheDataSet.Edit;
     TheDataSet.Cancel;
   Except
      Result := True;
   end;
end;

hi ray3898,

a other method

procedure TForm1.Button1Click(Sender: TObject); {Or other EventMethod}
var IsLocked : Bool;
begin
 if dbiisrecordlocked(table1.handle,IsLocked) = DBIERR_NONE then
   if IsLocked then showmessage ('Record Locked');
end;

This requires the unit BDE in the uses clause of your unit.

meikl

It seems to me that your method is reside on the client side rather than the application side (back-end).  Since both client A and client B would receive a copy of the actual data (table1.db) from the application server, so all locking are taken place on the local copy but not on the actual table (am I right ?)  Therefore, what I want is when client A want to edit a record, the program will check directly from the application server to determine the current status of the record. Is it possible to do it and how can I do it ?

Thank you