Question

Splashscreen with progressbar for query

Asked by: delphibeginner

I have made a splashscreen which I'm showing before the start of my application, on this splashscreen there is a progressbar which should display the progress of a query getting data from a remote database.

At this point the splash opens and closes quick after each other, but I want to see the splashscreen and the progressbar as well.

Can anyone help me with this?

Here the code of the project source code:

And the code to get the database from the remote database:

program songlisteditor;
 
uses
  Forms,
  songlisteditor1 in 'songlisteditor1.pas' {Form1},
  ABOUT in 'ABOUT.pas' {AboutBox},
  repunit2 in 'repunit2.pas' {Reportfrm},
  songlist1 in 'songlist1.pas' {Form2},
  repunit in 'repunit.pas' {Listfrm},
  mailsonglist1 in 'mailsonglist1.pas' {Form3},
  addressbook1 in 'addressbook1.pas' {Form4},
  splashscreen1 in 'splashscreen1.pas' {Form5};
 
{$R *.res}
 
begin
  Application.Initialize;
  Form5 := TForm5.Create(Application);
  Form5.Show;
  Form5.Update;
  // Time when Splash screen has to close after update database
  Form5.Hide;
  Form5.Free;
  Application.MainFormOnTaskbar := True;
  Application.Title := 'Songlist Editor';
  Application.CreateForm(TForm1, Form1);
  Application.CreateForm(TAboutBox, AboutBox);
  Application.CreateForm(TReportfrm, Reportfrm);
  Application.CreateForm(TReportfrm, Reportfrm);
  Application.CreateForm(TForm2, Form2);
  Application.CreateForm(TListfrm, Listfrm);
  Application.CreateForm(TForm3, Form3);
  Application.CreateForm(TForm4, Form4);
  Application.Run;
end.
 
 
procedure TForm5.FormCreate(Sender: TObject);
var ConTypes : Integer;
    Source, Target : TAdQuery;
    teller : integer;
begin
  ConTypes := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN + INTERNET_CONNECTION_PROXY;
  if InternetGetConnectedState(@ConTypes, 0) = True then
    begin
      AD_MySQL.Connected := True;
      AccessConnect;
      Source := TADQuery.create(nil);
      Target := TADQuery.create(nil);
      try
        Source.connection := AD_MySQL;
        Target.connection := AD_Access;
        Source.Close();
        Target.Close();
        Target.SQL.Add('DELETE * FROM songs');
        Target.ExecSQL;
        Source.SQL.Text := 'SELECT * FROM songs';
        Target.SQL.Text := Source.SQL.Text;
        Source.Active := True;
        Target.Active := True;
        while not Source.eof do
        begin
          Target.Append;
          for teller := 0 to Source.fieldcount -1 do
           Target.Fields[teller].Value := Source.Fields[teller].value;
          Target.Post;
          Source.next;
        end;
      finally
        if Source.active then Source.active := false;
        if Target.active then Target.active := false;
        Source.free;
        Target.Free;
      end;
    end;
end;

                                  
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Asked On
2009-09-11 at 16:39:06ID24726201
Tags

delphi 2009

,

splashscreen

,

query

Topics

Delphi Programming

,

Delphi IDE

,

Delphi Components

Participating Experts
2
Points
50
Comments
13

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Answers

 

by: preppydudePosted on 2009-09-11 at 20:14:57ID: 25314904

Well, the reason to why the splash form disappears quickly might be that the query runs fast (?).

The progressbar you have to control yourself. Like, say you wanted it to progress further for every row you parse in your loop and that you have a progressbar named pbQuery on your splash form. Then you'd do the following:

// ...
SplashForm.pbQuery.Position := 0;
SplashForm.pbQuery.Max      := Source.RowCount; // dont know about this one
while not Source.eof do
begin
  Target.Append;
  for teller := 0 to Source.fieldcount -1 do
    Target.Fields[teller].Value := Source.Fields[teller].value;
  Target.Post;
  Source.next;
  // update the progressbar
  Inc(SplashForm.pbQuery.Position);
  Application.ProcessMessages;
end;
// ...

                                              
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by: delphibeginnerPosted on 2009-09-12 at 02:43:31ID: 25315769

I've tried your code but got an error on line 12 (Inc(SplashForm.pbQuery.Position);)

"Left side cannot be assigned to"

 

by: preppydudePosted on 2009-09-12 at 02:46:15ID: 25315773

Ima test it when I boot into Windows... currently on osx :p meanwhile try:
SplashForm.pbQuery.Position := SplashForm.pbQuery.Position+1

 

by: delphibeginnerPosted on 2009-09-12 at 02:57:15ID: 25315797

Ok now no error on that, but when trying it again, I get an access violation of line:

"SplashForm.pbQuery.Position := 0;"

 

by: preppydudePosted on 2009-09-12 at 03:10:14ID: 25315825

I'll write a working example for you when I can get into Windows.. currently install the Wacraft client (58%).. takes ages. :(

 

by: delphibeginnerPosted on 2009-09-12 at 03:13:31ID: 25315836

OK thanks.

 

by: Geert_GruwezPosted on 2009-09-12 at 05:21:09ID: 25316198

have you ever heard of encapsulation ?
this is enclosing all needed into a box (and not surfacing too much) ...

i'll show you a better way of writing your units
you may benefit from it with bigger projects

also some remarks:
try and give a decent name to your components ... all of em
you'll benefit from it later in your life

your query gets run while the splash form is not visible yet
it is only visible after formshow (and processing the paint message)
the trick which allways works is posting a message in the same form in formShow event
and then handling that message
from then on the form is visible

you want as little code in your project file as possible
program prjTestApp1;

uses
  Forms,
  uMain in 'uMain.pas' {frmMain},
  uSplash in 'uSplash.pas' {frmSplash};

{$R *.res}

begin
  Application.Initialize;
  RunSplash;
  Application.MainFormOnTaskbar := True;

unit uSplash;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;
 
type
  TfrmSplash = class(TForm)
    progressCopy: TProgressBar;
    procedure FormShow(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    fRunning: Boolean;
    procedure LoadExternalDB(var Msg: TMessage); message WM_USER;
  public
    procedure Start;
  end;
 
var
  frmSplash: TfrmSplash;
 
procedure RunSplash;
 
implementation
 
{$R *.dfm}
 
procedure RunSplash;
begin
  if not Assigned(frmSplash) then
    frmSplash := TfrmSplash.Create(Application);
  frmSplash.Start;
end;
 
procedure TfrmSplash.Start;
begin
  if not fRunning then
  begin
    Show;
    BringToFront;
    Update;
  end;
end;
 
procedure TfrmSplash.LoadExternalDB(var Msg: TMessage);
var ConTypes : Integer;
    //Source, Target : TAdQuery;
    teller : integer;
begin
  case Msg.WParam of
    0:
    if not fRunning then
    begin
      fRunning := True;
      try
        (*
        ConTypes := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN + INTERNET_CONNECTION_PROXY;
        if InternetGetConnectedState(@ConTypes, 0) = True then
        begin
          AD_MySQL.Connected := True;
          AccessConnect;
          Source := TADQuery.create(Self);
          try
            Target := TADQuery.create(self);
            try
              Source.connection := AD_MySQL;
              Target.connection := AD_Access;
              Source.Close();
              Target.Close();
              Target.SQL.Add('DELETE * FROM songs');
              Target.ExecSQL;
              Source.SQL.Text := 'SELECT * FROM songs';
              Target.SQL.Text := Source.SQL.Text;
              Source.Active := True;
              Target.Active := True;
              while not Source.eof do
              begin
                Target.Append;
                for teller := 0 to Source.fieldcount -1 do
                  Target.Fields[teller].Value := Source.Fields[teller].value;
                Target.Post;
                progressCopy.Position :=  progressCopy.Position + 1;
                Source.next;
              end;
              Source.active := false;
              Target.active := false;
            finally
              Target.Free;
            end;
          finally
            Source.free;
          end;
        end;
        *)
      finally
        fRunning := False;
      end;
      PostMessage(Handle, WM_USER, 1, 0);
    end;
    1: Close;
  end;
end;
 
procedure TfrmSplash.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Action := caFree;
  frmSplash := nil;
end;
 
procedure TfrmSplash.FormShow(Sender: TObject);
begin
  PostMessage(Handle, WM_USER, 0, 0);
end;
 
initialization
  frmSplash := nil;
finalization
end.
                                              
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by: Geert_GruwezPosted on 2009-09-12 at 05:21:51ID: 25316205

if you want your splash modal:

procedure TfrmSplash.Start;
begin
  if not fRunning then
    ShowModal;
end;

                                              
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by: delphibeginnerPosted on 2009-09-12 at 06:21:54ID: 25316441

Your the greatest Geert_Gruwez, I can learn a lot from you.

The only thing remains is that I have some label on the frmSplash but they are not shown when frmSplash is shown. Maybe that's because of loading, but I would like to see the text when frmSplash is shown.

Thanks

 

by: delphibeginnerPosted on 2009-09-12 at 07:21:36ID: 25316593

Geert_Gruwez, I have a small favor to ask from you, I know it has not really something to do with this question, but the code you gave is part of it.

With the "procedure TfrmSplash.LoadExternalDB(var Msg: TMessage);" I copy data from a remote db to my ms access database (that already exists), I noticed that the size of that database grows (but the data is almost everytime the same), so how can impliment the compact fucntion in the procedure (above here), the database has to be the same name.

I hope you are willing to help me with this?

Thanks in advanged

 

by: Geert_GruwezPosted on 2009-09-12 at 14:09:23ID: 25317890

your local database msaccess is growing ?
well, one of the things about local databases is they mark records as deleted
but do not fysically delete the records
this increases performance for deleting, but alas, after some time, all other things like update/select/insert do actually slow down

i am not experienced with msaccess, i tend to go for oracle express/ sql express or firebird/interbase
it looks like you need this:
http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_21369434.html

 

by: delphibeginnerPosted on 2009-09-12 at 14:35:19ID: 25317987

Thanks, I already saw that code before but it uses an opendialog, and I want to implement the database already not that people need to chose it.

But I think I'll ask an other question for that.

I will give you the point, because you deserve it.

Many thanks on your help.

 

by: delphibeginnerPosted on 2009-09-12 at 14:35:58ID: 31627822

Thanks again

20120131-EE-VQP-002

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