Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


Problem with the ABORT procedure

Posted on 1998-12-09
Medium Priority
Last Modified: 2011-09-20
I was developing apps in Delphi 1.0. I migrated the project
to Delphi 3.0. But I got the compiling error with the following code:

procedure TfCliente.TableBeforeCancel(DataSet: TDataset);

   If MessageDlg('Cancel?', mtConfirmation,
                 [mbYes, mbNo], 0) = mrNo Then

Delphi says "Statement expected, but expression of type 'integer' found."

It's strange because I always used the ABORT procedure to cancel the TTable's Before procedures, but now in Delphi 3.0 it won't compile. I tried to put the ABORT procedure in other codes, it just shows the same error.

In this case will this be Delphi 3.0's bug?
Question by:davihongsikchoi
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Accepted Solution

gallaghe earned 600 total points
ID: 1350091
I think the problem has something to do with either the order of the units USES clause or a unit is missing from the unit.

try using my "Message" unit, (this isolates the call to MessageDlg) add it to the form;s uses clause which is causing the problem. Then use the function called "Question".

Caveat: Each of my routines allow you to do multi-lines in the messages by using a semi-colon rather then #13.

For example:
'This is line 1' + #13 + 'Line 2' ;

My method
'This is line 1;Line 2' ;

Demo call
procedure TfrmMain.Table1BeforeCancel(DataSet: TDataSet);
  if not Question('Cancel?') then
    abort ;

-------------Source code -------------------------
unit kg_MsgDlg ;


  Windows, Messages, Classes, Graphics;

function  Confirmation(const S: String): Word ;
function  Question(const S: String):Boolean ;
procedure Information(const S: String) ;
procedure InformationPos(const S: String;nRow,nCol:Integer) ;
procedure Alert(const S: String) ;
procedure ErrMsg(const S: String) ;
function  RetryBox(const S: String):Boolean ;
function  StrCrLf(const cMsg:String):String ;


uses SysUtils, Controls, Forms, Consts, Dialogs ;

function StrCrLf(const cMsg:String):String ;
var nLen,i:Integer ;

  nLen := Length(cMsg) ;
  i := 1 ;
  while i <= nLen do begin
    if cMsg[i] in [';','~'] then
      Result := Result + #13
      Result := Result + cMsg[i] ;
    Inc(i) ;
  end ;
end ;

function Confirmation(const S: String): Word ;
  case MessageDlg(StrCrLf(S),mtConfirmation,[mbYes,mbNo,mbCancel],0) of
     IDYES    : Result := mrYes ;
     IDNO     : Result := mrNo ;
     IDCANCEL : Result := mrCancel ;
     else       Result := mrCancel ;
end ;

procedure Alert(const S: String) ;
  MessageDlg(StrCrLf(S),mtWarning,[mbOk],0) ;
end ;

procedure Information(const S: String) ;
  MessageDlg(StrCrLf(S),mtInformation,[mbOk],0) ;
end ;

procedure InformationPos(const S: String;nRow,nCol:Integer) ;
  MessageDlgPos(StrCrLf(S),mtInformation,[mbOk],0,nCol,nRow) ;
end ;

procedure ErrMsg(const S: String) ;
  MessageDlg(StrCrLf(S),mtError,[mbOk],0) ;
end ;

function Question(const S: String):Boolean ;
  case MessageDlg(StrCrLf(S),mtConfirmation,[mbYes,mbNo],0) of
     IDYES    : Result := True ;
     IDNO     : Result := False ;
  else          Result := False ;
  end ;
end ;

function RetryBox(const S: String):Boolean ;
  case MessageDlg(StrCrLf(S),mtConfirmation,[mbRetry,mbNo],0) of
     IDRETRY  : Result := True ;
     IDNO     : Result := False ;
  else          Result := False ;
  end ;
end ;


Kevin S. Gallagher
LVL 27

Expert Comment

ID: 1350092
hi davihongsikchoi,

are you sure that your codefragment causes your problem? I've checked out and compiled it with D3 without errors.

Or if there a other defined by own Abort procedure? if so use sysutils.abort instead.


Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
Suggested Courses

715 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question