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Posted 5 Jan 2002

Invasion - A computer game using DirectDraw

, 4 Jun 2002
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This "Space Invaders"-like game was originally writen in DirectX 6, but I've changed some things so that you can use it with the latest version of the DirecX SDK. It uses just the Windows API and DirectX library (no MFC here). Have fun!
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Sample Image - Invasion1.jpg Sample Image - Invasion2.jpg

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This was my first attempt writing a computer game using the DirectX library. It was originally written for DirectX 6 library, but I've made some changes that made it work with the latest SDK. The code is based on the Windows API, without any reference to the MFC library. The only thing you need to compile this is VC++ and DirectX SDK, which can be found at

All the processing is done when no messages are available in the application message queue, by calling the UpdateFrame() function. As you see in the code, I haven't used many classes, and almost all the code is based on function calls. The only classes that are available are:

Alpha: this class is used as a reference to draw characters to the screen. This allow us to use a bitmap to draw the letters to the screen (so that the user doesn't need to install extra fonts in the system).

Extra: Defines an "Extra" element in the screen, that can be an Ammo box, an Bonus Box, a Weapon Advance Box or a Shield Charge.

Ovni: This class represents the UFOs that are going to be shot! Just to explain the name of the class... Ovni means UFO in Portuguese. Since I'm a Brazilian and a Portuguese speaker, there are some things in the code that are with my local language (don't worry, the comments are all English :o) )

Bullet: This represents the bullets that fly around the galactic battlefield.

Each one of the classes has a 'built-in' linked list that will be used a lot in the code. Each one of the classes have a common Draw function the is used to draw the specific object on the screen in its current state.

Almost everything in the code is commented, but if you have any trouble just mail me.

Have fun!


4 June 2002: I´ve removed a memory leak (directdraw interface was not being released) and have improved the surface creation function (winmain.cpp, line 3190). Now I try to create every surface on VIDEOMEMORY. If the function returns a DDERR_OUTOFMEMORY, I try to recreate it on SYSTEMMEMORY (winmain.cpp, line 3242).


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Mauricio Ritter
Web Developer
Brazil Brazil
Mauricio Ritter lives in Brazil, in the city of Porto Alegre. He is working with software development for about 8 years, and most of his work was done at a bank, within a home and office banking system.
Mauricio also holds MCSD, MCSE, MCDBA, MCAD and MCT Microsoft certifications and work as a trainer/consultant in some MS CTEC in his city.
Mauricio also works in his own programming site, aimed to Brazilian Developers:

In his spare time he studys korean language...

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Comments and Discussions

GeneralRe: Request Pin
Mauricio Ritter9-Jun-02 15:12
memberMauricio Ritter9-Jun-02 15:12 
GeneralRe: Request Pin
Brian Delahunty1-Sep-02 8:28
editorBrian Delahunty1-Sep-02 8:28 
GeneralMy Space Invaders Pin
Anonymous6-Jun-02 17:27
memberAnonymous6-Jun-02 17:27 
GeneralRe: My Space Invaders Pin
The Eclypse7-Jun-02 1:26
memberThe Eclypse7-Jun-02 1:26 
GeneralRe: My Space Invaders Pin
Cardinal Darek5-Nov-03 7:07
memberCardinal Darek5-Nov-03 7:07 
GeneralRe: My Space Invaders Pin
Paulo4911-Nov-03 8:16
memberPaulo4911-Nov-03 8:16 
GeneralRe: My Space Invaders Pin
Yoshua8-Feb-04 21:27
memberYoshua8-Feb-04 21:27 
GeneralCompile errors under DirectX 8.1... Pin
Mike Janzen5-Jun-02 9:31
memberMike Janzen5-Jun-02 9:31 
When i try to compile the game, I get the following errors:
I think the problem has to do with the fact that directdraw is not part of directx8. Please tell me what I have to do to get this to work.

<compile error>
c:\projects\samples\directdraw_game1\ddutil.h(14) : error C2061: syntax error : identifier 'IDirectDraw7'

Mike Janzen
Chief Software Architect

Globaleye Network Intelligence Ltd.
GeneralRe: Compile errors under DirectX 8.1... Pin
Mauricio Ritter5-Jun-02 14:06
memberMauricio Ritter5-Jun-02 14:06 
GeneralRe: Compile errors under DirectX 8.1... Pin
Anonymous7-Jun-02 14:30
memberAnonymous7-Jun-02 14:30 
GeneralRe: Compile errors under DirectX 8.1... Pin
Mauricio Ritter8-Jun-02 5:13
memberMauricio Ritter8-Jun-02 5:13 
GeneralRe: Compile errors under DirectX 8.1... Pin
Cardinal Darek9-Nov-03 22:50
memberCardinal Darek9-Nov-03 22:50 
GeneralI wish more people put full games on here.. Pin
LiquidKnight9-Mar-02 17:05
memberLiquidKnight9-Mar-02 17:05 
GeneralRe: I wish more people put full games on here.. Pin
Nish [BusterBoy]9-Mar-02 18:40
memberNish [BusterBoy]9-Mar-02 18:40 
GeneralRe: I wish more people put full games on here.. Pin
Mauricio Ritter11-Mar-02 0:34
memberMauricio Ritter11-Mar-02 0:34 
GeneralRe: I wish more people put full games on here.. Pin
Mauricio Ritter11-Mar-02 0:32
memberMauricio Ritter11-Mar-02 0:32 
GeneralI was wondering.. Pin
LiquidKnight26-Mar-02 12:01
memberLiquidKnight26-Mar-02 12:01 
GeneralRe: I was wondering.. Pin
Mauricio Ritter26-Mar-02 17:01
memberMauricio Ritter26-Mar-02 17:01 
GeneralRe: I was wondering.. Pin
Selevercin25-May-02 18:16
memberSelevercin25-May-02 18:16 
GeneralRe: I was wondering.. Pin
Mauricio Ritter26-May-02 2:52
memberMauricio Ritter26-May-02 2:52 
GeneralRe: I was wondering.. Pin
Selevercin1-Jun-02 13:23
memberSelevercin1-Jun-02 13:23 
GeneralRe: I wish more people put full games on here.. Pin
Anonymous1-Sep-02 8:42
sussAnonymous1-Sep-02 8:42 
GeneralMore Fun with Invasion Pin
Matt Philmon21-Feb-02 4:34
memberMatt Philmon21-Feb-02 4:34 
GeneralRe: More Fun with Invasion Pin
Mauricio Ritter21-Feb-02 5:18
memberMauricio Ritter21-Feb-02 5:18 
GeneralSuggestion Pin
Nish [BusterBoy]12-Jan-02 20:29
memberNish [BusterBoy]12-Jan-02 20:29 

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