控制台中加CCoeEnv

Reviewer Approved

If we now wanted to create and display a CCoeControl, we'd need to have a CONE environment (CCoeEnv)

as a minimum, as this class is used internally by the control. This makes things easier, given that CCoeEnv, as

its name implies, creates a whole environment for us, thus limiting our task to the proper control creation:

Library required:

LIBRARY euser.lib //CTrapCleanup

LIBRARY ws32.lib //RWsSession,RWindow

LIBRARY cone.lib //CCoeEnv

LIBRARY eikcoctl.lib //CEikTextListBox,CTextListBoxModel

class CMyControl : public CCoeControl

{

public:

void ConstructL(const TRect& aRect);

private:

void Draw(const TRect& aRect) const;

};

void CMyControl::ConstructL(const TRect& aRect)

{

CreateWindowL();

CWindowGc& gc = SystemGc();

gc.SetBrushStyle(CGraphicsContext::ESolidBrush);

gc.SetBrushColor(KRgbBlue);

gc.SetPenStyle(CGraphicsContext::ENullPen);

gc.Clear(aRect);

}

// S60 screen size

const TUint screenWidth = 176;

const TUint screenHeight = 208;

LOCAL_C void ExeMainL()

ctrl->ConstructL(TRect(0, 0, screenWidth, screenHeight));

ctrl->DrawNow();

CCoeEnv::Static()->WsSession().Flush();

CleanupStack::PopAndDestroy(ctrl);

}

GLDEF_C TInt E32Main()

{

#if defined(__WINS__)

// WINS already creates environment for us

CCoeEnv* coe = CCoeEnv::Static();

__ASSERT_ALWAYS(!error, User::Panic(_L("EXECTRL"), error));

User::After(3*1000*1000);

#if !defined(__WINS__)

coe->DestroyEnvironment();

#endif

return 0;

}

#if defined(__WINS__)

EXPORT_C TInt WinsMain()

{

return KErrNone;

}

#endif

Note that the emulator creates on our behalf an environment when loading an exedll/epocexe as .app, so we

have to avoid creating a new environment on emulator builds, otherwise, we'd get a CONE 2 panic

(Environment already exists)

Now moving a step further, we'd like to use existing controls, such as listboxes, dialogs, etc. In most cases, a

CONE environment won't be enough, so we'll have to resort on the Eikon environment:

#include <coedef.h> // TCoeWinPriority

#include <e32base.h> // CTrapCleanup