They are important especially if the StoredProc is a function returning something valid (a pointer would be a nice trap).
#FREE PASCAL BUTTON INSTALL#
There are many built-in units in Pascal and Pascal allows programmers to define and write their own units to be used later in various programs. For now, you should install PascalSCDADA through Lazarus OPM (Online Package Manager) installed by default in Lazarus 2.0. The blue cross with the yellow outline is the mouse cursor on the grey canvas/window.
The result looks like this: This image by is licensed under a Creative Commons Attribution 4.0 International License.
#FREE PASCAL BUTTON CODE#
A unit might consist of some code blocks, which in turn are made up of variables and type declarations, statements, procedures, etc. To have a custom mouse cursor we need a variable of type PSDLCursor. In our case, the button class would define the following property. StoredProc := you use OOP, you need to use "procedure of object" type for the procedure variable e.g:Īssignment is then basically the same, you just use can check if it's assigned by checking the StoredProc for nil (no need to set it to nil in objects or globals, both FPC and Delphi nil their variables in these cases) e.g.: A Pascal program can consist of modules called units. When the team that created what would inspire Free Pascal first sat down to design a. StoredProc: TProcedure // defined in system, but you can type specific ones as you needĪn you want to assign SomeProcedure to StoredProc. Then press F9 to run the application or click the button: After running the first program, we will get this output text: This is Free Pascal and Lazarus. This will be the default button (focused) Usually buttons in Lazarus dialogs have icons. What you're describing are basic callbacks. Advanced examples for buttons (from promptdialog.inc) mrOk, mrCancel, 'Cancel now', mrIgnore, 300, 'Do it', 'IsDefault' This will result in 4 buttons: 'Ok' returning mrOk. FPC is 100% compatible to delphi in Delphi mode (no need for altough using is much nicer IMHO, makes things clear).
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