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-   Object-Pascal / Delphi-Language (https://www.delphipraxis.net/32-object-pascal-delphi-language/)
-   -   Delphi Realtime Input? Thread? (https://www.delphipraxis.net/69337-realtime-input-thread.html)

sk.Silvia 13. Mai 2006 19:01


Realtime Input? Thread?
 
hi there, lets say i have this simple code

i:=0;
repeat
i:=i+1;
until i=10;

and i will enter numbers from a edit component - i write a number to edit and press the button, then the cycle continues

like :

Delphi-Quellcode:
i:=0;
repeat
  Memo1.Lines.Append('Enter field values '+IntToStr(i));
  P[i]:=%MyInput%; //Edit1.text;
  i:=i+1;
until i=10;
and it will looks like

> program starts
> it displays -> Enter field values 1
> then i write the values to an edit component and press the ok button //smt like the program stops and w8 for input from anothe component
> then again it displays -> Enter field values 2
> then again enter the numbers to edit component and click ok

it looks simple, but i have no clue how to do this, how to stop a procedure at a certain point, work with another procedure and the result inputs and continue from the neeede point

maybe to give the procedure to a threat, but thats also :/ for me

thanks

C.Schoch 13. Mai 2006 19:34

Re: Realtime Input? Thread?
 
why you dont try

Delphi-Quellcode:
i:=0;
repeat
  inputbox('Enter Number', ''Enter field values '+IntToStr(i)', '') // here i changed
  P[i]:=%MyInput%; //Edit1.text;
  i:=i+1;
until i=10;
?
The code waits while the Inputbox is diplayed.

Or don`t I understand the question?

sk.Silvia 13. Mai 2006 21:44

Re: Realtime Input? Thread?
 
ok thanks, thats it, but can i make my custom input box?

C.Schoch 13. Mai 2006 22:09

Re: Realtime Input? Thread?
 
Liste der Anhänge anzeigen (Anzahl: 1)
Yes you can. go to File - New - (in german version "Weitere") the rest is shown in the screenshot of course you can use the red marked.

you can add buttons, fields ... .
But you have to write every funktion by own hand.
like this:
Delphi-Quellcode:
procedure TMainForm.pmAddClick(Sender: TObject);
// Job hinzufügen
begin
  // here you can set standart values if you need
  TEditChange.ShowModal;
  if not (TEditChange.ModalResult = mrCancel) then // maybe use mrOK and leave "not"
    begin
      // do sometheng whith the Input Data
      lvSourceDestination.Items.Add;
      lvSourceDestination.Items[lvSourceDestination.Items.Count-1].SubItems.clear;
      lvSourceDestination.Items[lvSourceDestination.Items.Count-1].SubItems.add(TEditChange.eSourcePath.Text);
      lvSourceDestination.Items[lvSourceDestination.Items.Count-1].SubItems.add(TEditChange.eDestinationPath.Text);
      lvSourceDestination.Items[lvSourceDestination.Items.Count-1].SubItems.add(TEditChange.eApplicationPath.Text);
      // reset the edit fields, if you don`t do the old is shown at next show
      TEditChange.eSourcePath.Text := '';
      TEditChange.eDestinationPath.Text := '';
      TEditChange.eApplicationPath.Text := '';
    end
end;
edit: In D7 it`s in File - New - (in german version "Weitere") in the register "Dialogs"

sk.Silvia 14. Mai 2006 09:43

Re: Realtime Input? Thread?
 
but thats not exactly what i wanted... i will make smt like this // StopProcedure(Haf); and ContinueProcedure(Haf); this procedures dont exist, but i will make smt like this

Delphi-Quellcode:
procedure Haf;
var i:integer;
 begin
 i:=0;
 repeat
  StopProcedure(Haf); //this stops the procedure, but local variables, nothing will be lost, smt like it freezes the procedure for a            while
  input[i]:=Edit1.text;
  i:=i+1;
 until i=3;
 end;

//we can work with the program and when we press Button, Haf will contiue
procedure ButtonClick;
 begin
 ContinueProcedure(Haf);
 end;
i hope its a bit clearer now :-D

C.Schoch 14. Mai 2006 12:16

Re: Realtime Input? Thread?
 
You can do this with WaitForSingleObject and an Event

Your function
Delphi-Quellcode:
procedure Haf;
var i:integer;
begin
i:=0;
repeat
//////Wait///////////////////////////////////
repeat
  WaitResult := DWORD WaitForSingleObject(HANDLE hHandle, { handle of object to wait for} DWORD dwMilliseconds    { time-out interval in milliseconds}); // for Handele use "event" and you must set an timeout that the funktion returns and Messages are viewed and worked on
  if WaitResult <> WAIT_OBJECT_0 then
  begin
    Application.ProcessMessages;
  end;
until WaitResult = WAIT_OBJECT_0;
/////////////////////////////////////////////
// here you can use reset event if you want to wait contiously
  input[i]:=Edit1.text;
  i:=i+1;
until i=3;
end;
Create the event:
Delphi-Quellcode:
procedure TForm1.FormShow(Sender: TObject);
begin
event := HANDLE CreateEvent(

    LPSECURITY_ATTRIBUTES lpEventAttributes,   // pointer to security attributes
    BOOL bManualReset,   // flag for manual-reset event
    BOOL bInitialState,   // flag for initial state
    LPCTSTR lpName    // pointer to event-object name
   );
end;
Set the event:
Delphi-Quellcode:
procedure ButtonClick;
begin
SetEvent(event)
end;
Close the event:
Delphi-Quellcode:
procedure TForm1.FormClose(Sender: TObject);
begin
 CloseHandle(event)
end;
Now a lot of Pseudocode (not tested)
for additional informatin wiew the SDK.

Olli 14. Mai 2006 12:23

Re: Realtime Input? Thread?
 
If it runs in a separate thread MSDN-Library durchsuchenSuspendThread and MSDN-Library durchsuchenResumeThread might be exactly what you are searching for.

However, if you suspend the thread from the outside, the context is undetermined. So if you want the thread to be suspended at a certain position, it may suspend itself using SuspendThread and be woken up from another thread using ResumeThread.

Note: if you have the usual Delphi-like architecture of an application, there is only one main thread with a message queue. So to achieve the above you need to have a secondary thread at least. And be sure to sync them because the VCL does not like threads too much ;)

DGL-luke 14. Mai 2006 12:31

Re: Realtime Input? Thread?
 
So you have like 10 input params you want to fetch from the user?

Why not just make a second form:

Delphi-Quellcode:
for i := 0 to 9 do
  if form2.ShowModal = mrOK then
    begin
      values[i] := form2.some_public_field_assigned_before_closing;
    end
  else
    begin
      ShowMessage('Naaah... don''t press cancel!'); // ;-)
      Break;
    end;
EDIT: if you don't know how to make a form act modal, there should be enough material in the forum. or just ask ;)

C.Schoch 14. Mai 2006 13:06

Re: Realtime Input? Thread?
 
Liste der Anhänge anzeigen (Anzahl: 1)
@Olli the mainform is a thread too, and bacause of this you can use the wait function too.
Here i work with events and thay you can set from everywhere in the programm.

I made a little test program:

sk.Silvia 14. Mai 2006 13:11

Re: Realtime Input? Thread?
 
thanks for your help, threat are looking good, but what am i making wrong, why does it do - nothing - ?

Delphi-Quellcode:
var fiber:TThread;

procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
  begin
  fiber:=TTHread.Create(false);
  //fiber.Synchronize(???);
  i:=0;
  repeat
    Memo1.Lines.Append(IntToStr(i));
    fiber.Suspend;
    i:=i+1;
  until i=3;
  fiber.Terminate;
  end;

procedure TForm1.Button2Click(Sender: TObject);
  begin
  fiber.Resume;
  end;


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