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Wed, Jun 26 2013 4:13 PM | Permanent Link |
Ronald | Hi,
I tried to create my own component, based on a TCustompanel. If I create an instance of my component I get a stackoverflow error (the error is in Duth, so I hope the translation is correct). This is my (very) basic source of the component, what is wrong withit? unit cells; interface uses WebCore,WebCtrls; type TCell = class(TCustomPanel) private public constructor Create(AOwner: TComponent); override; destructor Destroy; override; end; implementation constructor TCell.Create(AOwner: TComponent); begin inherited Create(AOwner); end; destructor TCell.Destroy; begin inherited Destroy; end; end. Thanks, Ronald |
Thu, Jun 27 2013 3:30 AM | Permanent Link |
Mark Brooks Slikware | When do you get the stack overflow?
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Thu, Jun 27 2013 3:35 AM | Permanent Link |
Ronald | If I create an instance of TCell:
procedure TForm1.Form1Create(Sender: TObject); begin aCell:=TCell.Create(Self); aCell.Left:=100; aCell.Top:=100; aCell.Show; end; If I comment this out, it works fine. "Mark Brooks" schreef in bericht news:3616E07B-11CA-44A8-BA92-E0CC6B1D327D@news.elevatesoft.com... When do you get the stack overflow? |
Thu, Jun 27 2013 3:37 AM | Permanent Link |
Ronald | If I translate the error more accurate it says:
"Insufficient stack space" "Mark Brooks" schreef in bericht news:3616E07B-11CA-44A8-BA92-E0CC6B1D327D@news.elevatesoft.com... When do you get the stack overflow? |
Thu, Jun 27 2013 4:12 AM | Permanent Link |
Matthew Jones | Use Chrome to open it, press F12 to get the debug options, access the source tab
(IIRC), and find the Form1Create (Ctrl-F works). Then put a breakpoint on it. Now open the page again, and step through it. You will see what it is actually doing, and how the stack is growing. /Matthew Jones/ |
Thu, Jun 27 2013 4:22 AM | Permanent Link |
Mark Brooks Slikware | >>procedure TForm1.Form1Create(Sender: TObject);
>>begin >>aCell:=TCell.Create(Self); >>aCell.Left:=100; >>aCell.Top:=100; >>aCell.Show; >>end; Are you able to put this code into a button press rather than the FormCreate? Does the same problem occur? |
Thu, Jun 27 2013 4:48 AM | Permanent Link |
Walter Matte Tactical Business Corporation | >>procedure TForm1.Form1Create(Sender: TObject); >>begin >>aCell:=TCell.Create(Self); >>aCell.Left:=100; >>aCell.Top:=100; >>aCell.Show; >>end; I believe EWB behaves differently that Delphi. In the FormCreate "Self" (the form object) has not yet been initialized. See: http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb_general&page=1&msg=852#852 So try procedure TForm1.Form1Create(Sender: TObject); begin aCell:=TCell.Create(Form1); // <<<<<<<<< aCell.Left:=100; aCell.Top:=100; aCell.Show; end; Walter |
Thu, Jun 27 2013 4:48 AM | Permanent Link |
Mark Brooks Slikware | Mark Brooks wrote:
>>procedure TForm1.Form1Create(Sender: TObject); >>begin >>aCell:=TCell.Create(Self); >>aCell.Left:=100; >>aCell.Top:=100; >>aCell.Show; >>end; >>Are you able to put this code into a button press rather than the FormCreate? >>Does the same problem occur? And, what happens if you remove the call to the Show method? |
Thu, Jun 27 2013 4:52 AM | Permanent Link |
Mark Brooks Slikware | >>I believe EWB behaves differently that Delphi. In the FormCreate "Self" (the form object) has not yet been >>initialized.
>>See: >>http://www.elevatesoft.com/forums?action=view&category=ewb&id=ewb_general&page=1&msg=852#852 I thought that too, however I think Tim may have fixed this, primarily because my code uses "Self" in this scenario all over the place and it works just fine. I am running 1.02B1. Nonetheless, certainly worth a check. |
Thu, Jun 27 2013 5:01 AM | Permanent Link |
Ronald | I get the same error if I put the code under a button and replacing Self
with Form1 does not solve the problem either. "Mark Brooks" schreef in bericht news:BF20D6B8-5112-4485-B779-E3D82EAFE07B@news.elevatesoft.com... Mark Brooks wrote: >>procedure TForm1.Form1Create(Sender: TObject); >>begin >>aCell:=TCell.Create(Self); >>aCell.Left:=100; >>aCell.Top:=100; >>aCell.Show; >>end; >>Are you able to put this code into a button press rather than the >>FormCreate? >>Does the same problem occur? And, what happens if you remove the call to the Show method? |
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