If you declare a method in a descendant class that has the same name as a method in an ancestor class then you are hiding that ancestor method — meaning if you have an instance of that descendant class (that is referenced as that class) then you will not get the behavior of the ancestor. … Read more
The biggest danger of with, outside of pathological conditions like “with A, B, C, D” is that your code can silently change meaning with no notice to you. Consider this example: with TFoo.Create try Bar := Baz; DoSomething(); finally Free; end; You write this code knowing that Bar is a property of TFoo, and Baz … Read more
A very simple work around is to re-use the thread and not create and destroy them. Threads are pretty expensive, you’ll probably get a perf boost too… Kudos on the debugging though…
I Can reproduce with D7/Win7. I don’t use wsMaximized at all (similar random problems as you describe). Workaround: use OnActivate -> ShowWindow(Handle, SW_MAXIMIZE) e.g.: procedure TForm1.FormActivate(Sender: TObject); begin // Maximize only once when the Form is first activated if not FMaxsimized then begin FMaxsimized := True; ShowWindow(Handle, SW_MAXIMIZE); end; end; This method will not work … Read more
TWebBrowser is IE. It is not a plugable construction for browsers. You can have other browsers integrated in your application. See http://www.adamlock.com/mozilla/ http://delphi.mozdev.org/articles/taming_the_lizard_with_delphi.html http://ftp.newbielabs.com/Delphi%20Gecko%20SDK/ Time has moved on This answer is from ’08 and since then time has moved on. The links don’t work anymore and there are probably better alternatives now.
My list: The Dev.Express Quantum grid: enhanced grid component: once you get the hang of this component, you can use it in all sorts of scenarios (at least I have) Dev.Express Quantum Tree list: if you know the grid component, you can use this component as well (treelist and grid combined) Dev.Express Express bars: menu … Read more
You need to understand the reason, to avoid “cargo-cult programming.” Marking strings as const makes a performance difference because you no longer need to use an interlocked increment and decrement of the refcount on the string, an operation that actually becomes more expensive, not less, as time goes by because more cores means more work … Read more
From my knowledge, the most accurate method is by using QueryPerformanceFrequency: code: var Freq, StartCount, StopCount: Int64; TimingSeconds: real; begin QueryPerformanceFrequency(Freq); QueryPerformanceCounter(StartCount); // Execute process that you want to time: … QueryPerformanceCounter(StopCount); TimingSeconds := (StopCount – StartCount) / Freq; // Display timing: … end;
A simple cast will suffice: select cast(XMLCol as nvarchar(max)) as XMLCol Or for non-unicode: select cast(XMLCol as varchar(max)) as XMLCol You can’t convert explicitly to a ‘text’ data type. I’ve added the as XMLCol to ensure that the converted data has the the same name as the column. You needn’t have this, of course. EDIT: … Read more
As of Delphi 4, Delphi supports dynamic arrays. You can modify their sizes at run time and they will retain the data you stored in other elements at the old size. They can hold elements of any homogeneous type, including records and other arrays. You can declare a dynamic array the same as you declare … Read more