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Articles 71-80 of 118
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Ping without raw sockets - 21 January, 2003 - Serhiy Perevoznyk

Windows supports an Internet Control Message Protocol (ICMP) to determine whether or not a particular host is available. ICMP is a network layer protocol that delivers flow control, error messages, routing, and other data between Internet hosts....

Drawing Transparent Bitmaps - 21 January, 2003 - Serhiy Perevoznyk

A portion of a graphic image that does not change the contents of the screen is termed "transparent." The DrawIcon function can create an image that contains transparent portions. It is also possible to obtain this functionality using the...

Windows taskbar Tips&Tricks - 21 January, 2003 - Serhiy Perevoznyk

[delphi] How to press a "Start" button from your program: procedure TForm1.PressStart(Sender: TObject); var hTaskBar, hButton : HWND; hDCScreen : HDC; ScreenHeight : DWORD; begin //find "Start" button hDCScreen := GetDC(0);...

Bitmap rotation - 21 January, 2003 - Serhiy Perevoznyk

Bitmap rotation is a graphic effect that Delphi does not natively offer. This article shows how to rotate a given image in 90-degree increments. It allows you to rotate any image 0, 90, 180 or 270 degrees. With a little work, the code can be...

Drawing a Shaded Rectangle - 21 January, 2003 - Serhiy Perevoznyk

The GradientFill function fills rectangle and triangle structures. To add smooth shading to a triangle, call the GradientFill function with the three triangle endpoints. GDI will linearly interpolate and fill the triangle. To add smooth shading...

Distributed applications, the easy way (part 2) - 17 January, 2003 - Eugene Mayevski

In the first part of the article we took a brief look at the methods used to exchange information between different parts of the application. This part will deal with development of the simple chat system for Intranets. You will find an...

How to create balloon tooltips with API - 08 January, 2003 - Calin Marinescu

uses commctrl; ... const TTS_BALLOON = $40; TTM_SETTITLE = (WM_USER + 32); var Form1: TForm1; hTooltip: Cardinal; ti: TToolInfo; buffer : array[0..255] of char; ... procedure CreateToolTips(hWnd: Cardinal);...

Distributed applications, the easy way (part 1) - 18 December, 2002 - Eugene Mayevski

When your application consists of more than one process, you face the question of optimizing communications between the processes. Such distributed applications include computational grids, peer-to-peer networks, client-server and 3-tier business...

Alpha blending a bitmap - 28 October, 2002 - Serhiy Perevoznyk

Alpha blending is used to display an alpha bitmap, which is a bitmap that has transparent or semi-transparent pixels. In addition to a red, green, and blue color channel, each pixel in an alpha bitmap has a transparency component known as its...

Transparent forms - A simple solution - 21 October, 2002 - Toby Allen

In his previous articles Serhiy Perevoznyk explained how to create transparent forms (used to good effect by Textpad ). However from Delphi 6 there has been a simpler way as long as you want to make the entire form transparent, and not just...

Articles 71-80 of 118
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