For example, for our main program form to receive the messages use: DragAcceptFiles(Form1.Handle, True); Listing 2 Handle the WM_DROPFILES message. In Delphi we can declare a message handler for this event in the main form's class declaration: procedure WMDropFiles(var Msg: TWMDropFiles);...
Further down in the protected section we declare the methods of IDropTarget. We have used Delphi's method resolution clauses to rename each of the methods. This has been done because TForm already has a method called DragOver that clashes with, and gets hidden by, the method of the same ...
An example project is presented below. This project implements a very basic text editor that has buttons to cut, copy and paste text. ThePastebutton is enabled only when there is text on the clipboard. In order to implement thePastebutton functionality, the program's main window is registered...
I'm translating some legacy stuff from another language to Delphi/Pascal. It has several arrays of variable sizes. I can't figure out how the function is declared. Codewise, I have Code: type CustomTable = record m_kind: integer; m_value: integer; m_name: array[1..16] of char; ...
The fix is simple - just declare conn before entering the try block Connection conn =null;// Note the assignment to null to avoid error CS0165 - Use of possibly unassigned local variable 'conn'. try { conn =newConnection(); conn.Open(); ...
[3] := 8; // Update the record with this modified object instance Clear; SQL.Text := 'update cola_markets set shape = :polygon where mkt_id = 1'; DeclareVariable('polygon', otObject); SetComplexVariable('polygon', Polygon); Execute; Session.Commit; // Free the object Polygon.Free;...
AM Hello, in the header file youonly "" the static variables and in the source file you must "define" them. Declaration means that the compilerknows there is a variable of this name and type. Definition means that memory reserved for the variable. In your source file, no static...
Recent evidence has suggested that valuing happiness to an extreme degree has a potential downside in Western but not in East Asian countries. We tested ho
In the realm of higher education, e-learning has emerged as a game-changer, reshaping the way students engage with their studies. The purpose of this study
InRuby, you don't have to declare variables, but you do have to assign something to them before they can be referred to. If you're referring to alocal variablethat doesn't yet exist, you may see one of two errors. Ruby NameError Messages ...