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the run is no more than 255 bytes in length. There is more information about resource file compression in the UIQ SDK. Taking this explanation into account, you can see from the following table how the data is distributed between the elements of which the resource is composed. What you see is that, apart from the effects of data compression, the compiled resource just contains the individual elements, listed sequentially. A WORD, for example, occupies two bytes and an LTEXT is represented by a byte specifying the length, followed by the text. Where there are embedded STRUCTs, the effect is to flatten the structure. As we shall see later, the runtime interpretation of the data is the responsibility of the class or function that uses it. Start of MENU-PANE 00 [compressed data run length] 0F [uncompressed data run length] 02 00 array item count First MENU-ITEM 00 10 00 00 command = EHelloGuiCmd0 00 00 00 00 cascade=0 (default) 00 00 00 00 flags=0 (default) 06 [string count byte] 06 [compressed data run length] 49 74 65 6D 20 30 txt = "Item 0" 17 [uncompressed data run length] 00 extratxt=""(default) 00 bmpfile=""(default) FF FF bmpid=0xffff (default) FF FF bmpmask=0xffff (default) 00 00 00 00 extension=0 (default) Second MENU-ITEM 00 01 00 00 command = EEikCmdExit 00 00 00 00 cascade=0 (default) 00 00 00 00 flags=0 (default) 0D [string count byte] 0D [compressed data run length] 43 6C 6F 73 65 20 txt = "Close (Debug)" 28 64 65 62 75 67 29
0E [uncompressed data run length] 00 extratxt=""(default) 00 bmpfile=""(default) FF FF bmpid=0xffff (default) FF FF bmpmask=0xffff (default) 00 00 00 00 extension=0 (default) Completion of MENU-PANE 00 00 00 00 extension=0 (default) APIs for reading resources BAFL provides the basic APIs for reading resources: � The oddly named RResourceFile class, in barsc.h, is used for opening resource files, finding a numbered resource, and reading its data. (RResourceFile behaves more like a C class than an R class.) � TResourceReader in barsread.h is a kind of stream-oriented reader for data in an individual resource. TResourceReader functions are provided that correspond to each of the resource compiler's built-in data types. As an example of the use of TResourceReader functions, here's the code to read in a MENU_ITEM resource, extracted from eikmenup.cpp(see \Release\Generic\appframework\uikon\coctlsrc\eikmenup.cpp in the source supplied with the UIQ SDK): EXPORT_C void CEikMenuPaneItem::ConstructFromResourceL (TResourceReader& aReader) { iData.iCommandId=aReader.ReadInt32(); iData.iCascadeId=aReader.ReadInt32(); iData.iFlags=aReader.ReadInt32(); iData.iText=aReader.ReadTPtrC(); iData.iExtraText=aReader.ReadTPtrC(); TPtrC bitmapFile=aReader.ReadTPtrC(); TInt bitmapId=aReader.ReadInt16(); TInt maskId=aReader.ReadInt16(); aReader.ReadInt32(); // extension link if (bitmapId != -1) } { SetIcon(CEikonEnv::Static()->CreateIconL( } bitmapFile, bitmapId, maskId));
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Table of Contents Symbian OS C++ fo
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Reprinted August 2003 All Rights Re
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� consultants, trainers, and auth
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Symbian OS C++ for Mobile Phones fo
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When you're ready to use the Symbia
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improvement. She has a reputation f
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John works in the partner projects
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If you've never seen Symbian OS bef
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within a particular application. In
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There are a number of other ways in
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programs - namely, to handle and re
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There is no need to trap the call t
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abld build winscw udeb The winscw p
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If you're curious, you might want t
Page 29 and 30:
If your connectivity software does
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Chapter 2: System Structure Overvie
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Figure 2.2 Figure 2.3 Symbian OS OE
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Note Actually, for performance reas
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To be executed, an executable has t
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The kernel itself has two major com
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ROM handling is easy. The ROM consi
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You can control the stack size in a
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industry standard, slightly smaller
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A server also uses its own active o
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In order to minimize any difficulty
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� The top-level project name in t
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Title DLL Source Group Headers Desc
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Chapter 3: C++ and Object Orientati
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The fundamental rule is, use names
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Category Examples Description Const
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3.2.6 Summary Naming conventions ar
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Convenience functions are trivial w
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� When declaring a virtual functi
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used in preference to old style C c
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Java uses interfaces too: in Java,
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� Whether these are private or pu
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If the cardinality is not 1-to-1, t
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Figure 4.1 At the bottom is the GDI
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In addition to the four C++ classes
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In addition, as indicated by the SO
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Figure 4.3 SDK and then browse to t
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eturn KErrNone; } Important You mus
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private: // from CEikDocument CEikA
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ConstructL() performs second-phase
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hellogui's application view is a co
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The other things we haven't seen in
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form described above advertises the
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} RESOURCE TBUF r_hellogui_text_hel
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CQikAppUi::HandleWsEventL(const TWs
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4.9 Terminating the Application By
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debug stepping, variable watching,
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5.1 Strings and Memory To understan
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� HBufC* is a pointer to a heap-b
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strlen() doesn't include the traili
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The Des() function returns a TPtr c
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TBuf helloWorld(_L("hello")); greet
Page 113 and 114: TDes& parameters. Symbian OS itself
Page 115 and 116: 5.4 More Text APIs Symbian OS uses
Page 117 and 118: encodings of Unicode that use seque
Page 119 and 120: Chapter 6: Error Handling and Clean
Page 121 and 122: Even user input errors can be handl
Page 123 and 124: Note It also demonstrates that the
Page 125 and 126: eak; So, the New 1 menu item alloca
Page 127 and 128: this line yourself, and then rerun
Page 129 and 130: case EMagicCmdNew2: delete iObject2
Page 131 and 132: If the new(ELeave) fails, then iObj
Page 133 and 134: If you're writing a function, and t
Page 135 and 136: } You can invoke these functions fr
Page 137 and 138: Any one of the calls to UseL() may
Page 139 and 140: case EMagicCmdUse4: { CY* y = new(E
Page 141 and 142: � Functions that can leave must o
Page 143 and 144: CZ::NewL() was actually coded waste
Page 145 and 146: TAny*. The cleanup code will deallo
Page 147 and 148: successfully). This means you have
Page 149 and 150: User::Leave(KErrNone). This appears
Page 151 and 152: systems outside my control, and res
Page 153 and 154: Chapter 7: Resource Files Overview
Page 155 and 156: Data Type Description BUF A Unicode
Page 157 and 158: } MENU_ITEM { command = EExampleCmd
Page 159 and 160: A single resource file supports 409
Page 161 and 162: Filename Description EeikCmdExit, a
Page 163: RESOURCE MENU_PANE r_hellogui_hello
Page 167 and 168: Chapter 8: Basic APIs Overview We'v
Page 169 and 170: IMPORT_C void Write(TInt aPos, cons
Page 171 and 172: _LIT8(KTxt2," world"); buf->InsertL
Page 173 and 174: Dynamic buffers are also used to st
Page 175 and 176: Class name Description [*] CArrayFi
Page 177 and 178: In v7.0, the structure of ROM image
Page 179 and 180: } In a function such as FormatList(
Page 181 and 182: library. The next few pages should
Page 183 and 184: Using this technique, your program
Page 185 and 186: � The original program consisted
Page 187 and 188: pointer, and no method of directly
Page 189 and 190: Figure 9.1 It's a pretty Spartan di
Page 191 and 192: Note 9.2.3 The Controller As descri
Page 193 and 194: TInt iLength; // Length - determine
Page 195 and 196: void SetHit(TInt aX, TInt aY); // H
Page 197 and 198: The functions to do this are Functi
Page 199 and 200: User::After(1) is guaranteed to wai
Page 201 and 202: { public: // Construct/destruct/set
Page 203 and 204: This begins by creating a new windo
Page 205 and 206: ); aRect.iTl.iX+iBorderSize+i*iTile
Page 207 and 208: else gc.SetPenColor(KRgbYellow); gc
Page 209 and 210: control framework needs to know whe
Page 211 and 212: the board. It then uses these coord
Page 213 and 214: Calculate board size in twips, and
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iRightBorder.Move(offset); iBoardRe
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private: // Construct/restore void
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ViewCmdHitFleet() shows how the con
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There are no surprises in the comma
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}; MENU_ITEM {command=EEikCmdZoomIn
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The framework handles creating a fi
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void TShip::ExternalizeL(RWriteStre
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void CGameAppUi::HandleCommandL(TIn
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the target view. Because such messa
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TInt iCursorX; TInt iCursorY; TUid
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display area) and to handle a parti
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Create and load a bitmap iHideBitma
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This version formats the message ID
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Chapter 10: Dialogs and Concrete Co
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Figure 10.2 I got this by typing Ct
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Finally, note that buttons can't be
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for 'control'. I'll always use 'con
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CEikDialog* dialog = new(ELeave) CE
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Simply put, the dialog has a title,
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OK is handled by OkToExitL(). In fa
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Any of the checks or file operation
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}; id = EGameControlIdProtocol; con
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Listen"; } type = EEikCtChoiceList;
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TUid protocol = TUid::Uid(choicelis
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10.3.2 Adding Buttons If you want t
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Function Description virtual void S
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� specify initialization data for
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CEikBorderedControl CEikBorderedCon
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� eikon.rh and Qikon.rh contain t
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Class Header ID CEikGlobalTextEdito
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UIs provide many other standard dia
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Figure 11.1 As it happens, this scr
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gc.DrawText(*iHelloWorld, rect, bas
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The two points that define Trect ca
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The clipping region defines the reg
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virtual void DrawBitmap(const TRect
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Figure 11.5 From the diagram: � T
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In theory, then, you don't need to
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So far, we have suggested that you
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DrawBorders(); DrawTiles(); } but t
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It turns out that working out exact
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Now it's time to be precise about h
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Figure 11.10 It has a single window
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{ public: . . . static CExampleHell
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case 2: return EAmountOfControls; }
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finished. When the BeginRedraw()fun
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Default settings are assured here:
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First and foremost, a control is a
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class CCoeControl : public CBase {
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You can set a control's position an
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IMPORT_C virtual void Draw(const TR
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� If you select OK on a dialog -
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In this chapter, I've concentrated
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TKeyResponse COppFleetView::OfferKe
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TEventCode is the type of window se
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notification, and changing the curs
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From the preceding discussion, it s
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� if the Set interval button is s
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� The general-purpose control des
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private: ... MCoeControlObserver* i
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Special-purpose events should be ha
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Figure 12.4 Key events are offered
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A control should change its appeara
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12.4.3 Grabbing the Pointer-down Co
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ProcessPointerEventL() implements t
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In the last chapter, we concentrate
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making them lighter or darker. For
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Chapter 13: Files, Streams, and Sto
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Note Strictly, documents are not th
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Figure 13.2 The file server provide
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� changing directory and file att
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important in Symbian OS, so it's pr
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Figure 13.5: � Write file allows
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TryChangeFocusToL(EExampleControlId
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file.Close(); // Finished with user
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Update view iAppView->DrawNow(); }
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} // Finish CleanupStack::PopAndDes
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external stream and de-serialize wh
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RwriteStream Functions RReadStream
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You'll remember that I used this, w
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Technique Application descriptor wh
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Let's consider the file format of t
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� create, write, and close the ap
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Figure 13.10 The main document is a
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through the DBMS. For more on using
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Figure 13.13 There is a small class
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� Where an application's .ini fil
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The first step of the process is to
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END SOURCE 1 icon2mask.bmp SOURCE c
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id=EHelloGuiCmd0; flags=EEikToolBar
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Figure 14.4 abld build winscw udeb
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For the purpose of this book, we'll
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#include RESOURCE AIF_DATA { capti
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1 file(s) copied. When this has fin
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The way the Certificate Generator w
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The body of this file should be obv
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Don't expect the installed applicat
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� Every application should fill t
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� Use bold style for active text
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Overview This chapter discusses wri
Page 415 and 416:
Class Description CExampleApplicati
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Class Description Figure 15.3 conta
Page 419 and 420:
aDeviceRect.Center().iY - boxInPixe
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} fontSpec)); The key function here
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The second case will cause problems
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I'm careful to draw every pixel: I
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SetZoomOutL() works the other way r
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ealistic print code would take acco
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Figure 15.7 The base class for bitm
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lit them efficiently from a shared
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#define KRgbYellow TRgb(0x00ffff) #
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world colors mapped down onto black
Page 439 and 440:
Figure 15.8 The GUI used in the Psi
Page 441 and 442:
In terms of applications, the appli
Page 443 and 444:
Overview So far in this book, we've
Page 445 and 446:
Figure 16.2 The starting point for
Page 447 and 448:
if (iController->Engine().IsMyTurn(
Page 449 and 450:
device, I will have to publish thes
Page 451 and 452:
� If your request didn't get thro
Page 453 and 454:
Communications is full of this kind
Page 455 and 456:
The game will connect and you can s
Page 457 and 458:
Figure 16.9 The controller contains
Page 459 and 460:
iEngine->iOppFleet.SetShipType(aX,
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if(!iController->IsMyTurn()) iEikon
Page 463 and 464:
Of course, the opponent's response
Page 465 and 466:
wrong with it. And it may not alway
Page 467 and 468:
fleet.SetHit(x,y); // update view i
Page 469 and 470:
With this scheme, each chat message
Page 471 and 472:
For a minimum level of skill, the c
Page 473 and 474:
CONE maintains an outstanding reque
Page 475 and 476:
Figure 17.2 It is also worth mentio
Page 477 and 478:
some function that will later gener
Page 479 and 480:
So the scheduler handles precisely
Page 481 and 482:
CActive implements the Cancel() fun
Page 483 and 484:
A RunL() function can stop the acti
Page 485 and 486:
}; Figure 17.9 Member functions her
Page 487 and 488:
Function Description Stop() Decreas
Page 489 and 490:
17.3.1 Maintaining an Outstanding R
Page 491 and 492:
Change visibility of app view text
Page 493 and 494:
static CMultiPartHello* NewL(CActiv
Page 495 and 496:
iTimer.After(iStatus, iDelay); SetA
Page 497 and 498:
I prefer to hide active objects fro
Page 499 and 500:
In active objects, higher priority
Page 501 and 502:
Figure 18.1 Some simple server tran
Page 503 and 504:
A new session has a handle that is
Page 505 and 506:
Figure 18.4 Before any subsessions
Page 507 and 508:
Figure 18.5 When the buffer is full
Page 509 and 510:
Related servers can be run in the s
Page 511 and 512:
� Request the window server to dr
Page 513 and 514:
This is because, when a client thre
Page 515 and 516:
Figure 18.8 18.4.1 Thread Basics Th
Page 517 and 518:
GetDesLength() return this as their
Page 519 and 520:
class RSessionBase : public RHandle
Page 521 and 522:
RSubSessionBase - client-side sub-s
Page 523 and 524:
Bootstrap code for a server should
Page 525 and 526:
The CSharableSession class provides
Page 527 and 528:
RMessage is not intended for deriva
Page 529 and 530:
The GSDP server presented here has
Page 531 and 532:
IMPORT_C TInt GetGdpProtocolInfo(TI
Page 533 and 534:
with all four slots, even if you do
Page 535 and 536:
}; RGsdpSession::Listen() calls CGs
Page 537 and 538:
inline RGsdpSession() : iHandler(0)
Page 539 and 540:
If, in the first step above, the ke
Page 541 and 542:
The GSDP client API implements a sy
Page 543 and 544:
� Function() gives me the request
Page 545 and 546:
Basically, the setter stores its ar
Page 547 and 548:
As we saw in Chapter 17, any API pr
Page 549 and 550:
Many Symbian OS servers use polymor
Page 551 and 552:
construct shutdown timer iShutdown=
Page 553 and 554:
void CGsdpProtocolUpdater::RunL() {
Page 555 and 556:
GSDP clients can select the protoco
Page 557 and 558:
} }; } }; } version_no = 1; display
Page 559 and 560:
} aFromPort, aData); If iLastError
Page 561 and 562:
� The datagram arrives via a GDP
Page 563 and 564:
AddPacket() is a method provided by
Page 565 and 566:
iReceiveMessage.Complete(KErrNone);
Page 567 and 568:
� The client program launches a n
Page 569 and 570:
server.Close(); return died.Int();
Page 571 and 572:
CGsdpScheduler::TServerStart start;
Page 573 and 574:
aStart.SignalL(); CActiveScheduler:
Page 575 and 576:
19.4 Summary In this chapter, we've
Page 577 and 578:
Figure 20.1 Typically, a communicat
Page 579 and 580:
This encapsulation is important, as
Page 581 and 582:
else // Everything was OK, leave th
Page 583 and 584:
suite of protocols: UDP, TCP, ICMP
Page 585 and 586:
member of the GDP-SMS session objec
Page 587 and 588:
This puts it into an initial state,
Page 589 and 590:
void CGdpSmsSender::TSendMsgState::
Page 591 and 592:
If, for some reason, the operation
Page 593 and 594:
RSmsSocketReadStream readstream(iRe
Page 595 and 596:
Bluetooth is composed of a hierarch
Page 597 and 598:
Figure 20.10 shows two sequential o
Page 599 and 600:
As with GDP-SMS, the SendL() functi
Page 601 and 602:
Once connected, the sockets interfa
Page 603 and 604:
err = iListenSocket.Listen(4); User
Page 605 and 606:
iReceiver.iReadSocket.Read(iReceive
Page 607 and 608:
Appendix 1: Example Projects Overvi
Page 609 and 610:
AppForge development software integ
Page 611 and 612:
Psion has a long history of using S
Page 613 and 614:
Appendix 3: TOGS Guide and Referenc
Page 615 and 616:
protected: TUid iDtor_ID_Key; }; CG
Page 617 and 618:
eturn KErrNone; } TInt CGdpLoopback
Page 619 and 620:
packet to the initiating partner: t
Page 621 and 622:
inline RGsdpSession() : iHandler(0)
Page 623 and 624:
Function Description MGsdpPacketHan
Page 625 and 626:
RGCP TOGS is designed to support tu
Page 627 and 628:
Packet structure RGCP uses GSDP as
Page 629 and 630:
State Meaning responses are handled
Page 631 and 632:
Figure A3.10 Here's CRgcpSession's
Page 633 and 634:
void GsdpHandleL(const TDesC8& aDat
Page 635 and 636:
virtual void RgcpHandleBound() = 0;
Page 637 and 638:
State Meaning Listening You have ch
Page 639 and 640:
From To Occurs When other player, t
Page 641 and 642:
Opcode Name Details want-second.Res
Page 643 and 644:
Appendix 4: Emulator Reference Over
Page 645 and 646:
Figure A4.2 This source compatibili
Page 647 and 648:
Figure A4.5 An emulator configurati
Page 649 and 650:
Each Symbian OS .exe built for the
Page 651 and 652:
In different UIs, there can be addi
Page 653 and 654:
ARM data alignment rules are strict
Page 655 and 656:
Key Description W Dump full window
Page 657 and 658:
event handling threads 569 events,
Page 659 and 660:
Application Programming Interfaces
Page 661 and 662:
Boolean data type 55 Boss Puzzle di
Page 663 and 664:
CGsdpSession 650 CanReceivePacket()
Page 665 and 666:
certificate file 472 Certificate Ge
Page 667 and 668:
ServiceL error handling 646 CGsdpSe
Page 669 and 670:
CObjectIx class 614 CodeWarrior deb
Page 671 and 672:
context switching 27 performance is
Page 673 and 674:
CSession class 598, 614, 624 CShara
Page 675 and 676:
text 501 fonts 495 GDI 507 line dra
Page 677 and 678:
const rule, breaking 334 descriptio
Page 679 and 680:
DrawVerticalBorder() function 238 D
Page 681 and 682:
ExternalizeL() function 261 testing
Page 683 and 684:
files 416 copying to emulator 773 s
Page 685 and 686:
G game datagram protocol see GDP pr
Page 687 and 688:
drawing 237 zooming 245 GetZoom() f
Page 689 and 690:
graphics interaction 370 pick corre
Page 691 and 692:
Install() function CActiveScheduler
Page 693 and 694:
graphics interaction handling 370 O
Page 695 and 696:
summary 485 MakeVisible() function
Page 697 and 698:
multithreading 43 MVC 287 controlle
Page 699 and 700:
packets see datagrams palettes 516
Page 701 and 702:
private key 472 privilege boundarie
Page 703 and 704:
ReceiveAllL() 697 ReceivePacket() f
Page 705 and 706:
Revo 23 RFCOMM 701 RFile class 46 v
Page 707 and 708:
RWriteStream 425 streams 430 vs. RF
Page 709 and 710:
CGraphicsContext class 324 SetBrush
Page 711 and 712:
simple getter functions 60 single-p
Page 713 and 714:
Static() function CCoeEnv class 357
Page 715 and 716:
ESOCK sockets server 526 ETEL telep
Page 717 and 718:
TDisplayMode 516 Telephony server 6
Page 719 and 720:
TParsePtr 418 TParsePtrC 418 TPckg
Page 721 and 722:
derivation relationships 75 Unicode
Page 723:
flicker-free redraw 354 invalid reg
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