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:
and it will looks like
i:=0;
repeat Memo1.Lines.Append('Enter field values '+IntToStr(i)); P[i]:=%MyInput%; //Edit1.text; i:=i+1; until i=10; > 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 |
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? |
Re: Realtime Input? Thread?
ok thanks, thats it, but can i make my custom input box?
|
Re: Realtime Input? Thread?
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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:
edit: In D7 it`s in File - New - (in german version "Weitere") in the register "Dialogs"
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; |
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:
i hope its a bit clearer now :-D
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; |
Re: Realtime Input? Thread?
You can do this with WaitForSingleObject and an Event
Your function
Delphi-Quellcode:
Create the event:
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;
Delphi-Quellcode:
Set the event:
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;
Delphi-Quellcode:
Close the event:
procedure ButtonClick;
begin SetEvent(event) end;
Delphi-Quellcode:
Now a lot of Pseudocode (not tested)
procedure TForm1.FormClose(Sender: TObject);
begin CloseHandle(event) end; for additional informatin wiew the SDK. |
Re: Realtime Input? Thread?
If it runs in a separate thread SuspendThread and ResumeThread 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 ;) |
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:
EDIT: if you don't know how to make a form act modal, there should be enough material in the forum. or just ask ;)
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; |
Re: Realtime Input? Thread?
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@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: |
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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