Essential Delphi 2.0 Fast : How to Develop Applications in by John Cowell BSc(Hons), MPhil, PhD (auth.)

By John Cowell BSc(Hons), MPhil, PhD (auth.)

Delphi is a brand new home windows software program improvement atmosphere from Borland. published in 1995, it has quick outfitted up a good attractiveness as the most effective home windows software program improvement tools.
John Cowell exhibits the way to software in Delphi utilizing a number of instruments. He presents plenty of examples and illustrations and describes quite a few database particular instruments integrated with the Delphi package deal. The booklet indicates the way to use the Borland database engine besides different database codecs (including Microsoft's Access). there are various chapters which disguise the object-oriented elements of Pascal, and complicated programming thoughts similar to drag-and-drop, DDE, OLE, and the construction of online aid platforms also are checked out. New clients, in addition to present visible uncomplicated clients desirous to wake up to hurry on Delphi, will locate this transparent and informative booklet offers all of the info they should strengthen home windows purposes fast, adequately, and easily.

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V""v 12Mb On Fig. I~ ~ [~ <400 Mb 400 - 599 Mb 600 - 799 Mb , I :111 >lGb .. Using (ombo boxes Run-time Properties The properties that you have seen so far have been available both at design-time and at run-time, but some properties are only available at run-time. When you run this program, you do not want to see the text combobox1 in the first edit box. To change this, the Itemlndex property is used. This is a run-time property that cannot be changed at design-time. If Itemlndex is set to minus 1, the combo box is initially blank.

The TRadioButton Component The TRadioButton (fig. 6) is similar to the TCheckBox component in that it is used to indicate a true or false option. The difference is that radio buttons are usually grouped together in either a TPanel, TGroupBox, or TScrollBox component. If this is the case, only one of the group of TRadioButtons components can be set to true. ~ntiijiij r Fig. 6 Pentium Pro The TRadioButton component In common with check boxes, radio buttons can be made unavailable by using the Enabled property, and the Alignment property used to place the button on the right or left of the text.

Return Values from MessageDlg The MessageDlg function returns a value that indicates which-button has been clicked. The possible return values are: mrNone, mrOk, mrCancel, mrAbort, mrRetry, mrIgnore, mrYes, mrNo and mrAll. Creating Input Forms Dialog boxes can also be used to prompt for input, using two functions, InputBox and InputQuery. The InputBox function is defined as: Function InputBox(const ACaption, APrompt, ADe/ault: string) : string; Parameter Meaning ACaptlon The caption of the dialog box.

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