Delphi pass procedure as parameter
WebApr 26, 2011 · Change the type and number of parameters needed. type TMyProcEvent = procedure (const AIdent: string; const AValue: Integer) of object; TMyFuncEvent = function (const ANumber: Integer): Integer of object; In the class, you can add a DoEvent (rename for the proper event). SO you can call the DoEvent internally. WebSep 5, 2001 · Can anybody tell me how to execute a procedure that you pass as a parameter? I have: type DBproc = procedure (); procedure DBUpdateProcedure (a_procedure: DBproc); begin {statements} a_procedure; end; procedure proc_a (); begin {statements} end; Then I would like to execute proc_a like this: DbUpdateProcedure …
Delphi pass procedure as parameter
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WebJan 6, 1997 · Delphi handles multi-dimensional arrays as user defined type, so there is no syntax to tell a procedure that its parameter(s) are multi-dimensional arrays - without declaring a type. Creating a type, and using this type as the parameter is the correct method to pass a multi-dimensional array. WebHowever, your question is marked Delphi 7, which does not support anonymous procedures, anonymous threads, or tasks, so you are basically stuck manually passing your TThread object to your procedure code. You could use your own thread variable if you don't want to pass the object pointer as a procedure parameter.
WebAug 21, 2024 · You can pass to an overloaded routine parameters that are not identical in type with those in any of the declarations of the routine, but that are assignment-compatible with the parameters in more than one declaration. This happens most frequently when a routine is overloaded with different integer types or different real types - for example: WebApr 8, 2024 · 1 Answer. Just add parentheses at the end of the function call. In this way you are informing the compiler that you want to store the functions in the variables. Otherwise you are going to execute the functions and assign their results to the variables. var aMF1 : TMyFactory1; aMF2 : TMyFactory2; begin aMF1 := getMyFactory1 (); aMF2 ...
WebEqual operator in Generic holding Records in Delphi; JvListView - How to run code only when user clicks on checkbox? What is the equivalent of this construct in Delphi 2007 downward? Playing the MIDI at the iOS from Delphi XE - 5; How to check if a user is edting a table record before allowing another user to edit, not wait for post? WebJan 15, 2012 · In Delphi, a function has been declared as follows: function Point ( X, Y : integer ) : TPoint; begin Result.X := X; Result.Y := Y; end; You can then call this function 'inline' to create the record 'on the fly' to to quickly …
WebApr 1, 2009 · If you were using Delphi 2009, you could do this with an anonymous method: TSomeObject = class (TObject) public procedure Move (MoveProc: TProc); end; procedure Usage; var o: TSomeObject; i: ISomeInterface; begin o := TSomeObject.Create; i := GetSomeInterface; o.Move (procedure () begin i.Next end);
WebMay 22, 2014 · A var parameter cannot be optional, it must be passed a variable. For what you are looking for, use pointers instead: procedure StringProcess (StartString: string; S1:PString; S2:Pstring; S3:Pstring); begin ... if S1 <> nil then begin // Use S1^ as needed... end; ... end; Then you can do things like this: oversized clocks for wallsWebFeb 1, 2024 · Choose Parameters from the Run menu, and then add Delphi … rancher change portWebMay 10, 2024 · you have to assign the address of the procedure to OnClick, not call the procedure. the procedure must take only 1 input parameter, which is the TObject that fires the event (in this case, the TPanel that is being clicked on). So, for what you are attempting, you would need to do something more like this instead: procedure … rancher cis benchmarkoversized cloth covered casketsWebAug 29, 2011 · Untyped Parameters. You can omit type specifications when declaring var, const, and out parameters. (Value parameters must be typed.) For example: procedure TakeAnything(const C); declares a procedure called TakeAnything that accepts a parameter of any type. When you call such a routine, you cannot pass it a numeral or … oversized clothes hamperWebFeb 26, 2015 · type TRecordType = (rtPerson, rtSpider); procedure DoSomething (RecordType: TRecordType; const ARecord); begin case RecordType of rtPerson: DoSomethingWithThisPerson (TPerson (ARecord)); rtSpider: DoSomethingWithThisSpider (TSpider (ARecord)); end; end; You might contemplate putting the type code in the first … oversized clock wallWebJul 2, 2013 · The procedure does not modify the value of the variable passed for Source, so that parameter’s declaration uses const instead of var, which is the more common modifier for untyped parameters. In the case of TStream.Read , the source is the stream's contents, so you don't pass that in as a parameter, but the destination is the Buffer parameter ... oversized clothes for ladies