在Symbian exe 程序中显示图形

核心提示：NewApplication() factoryfunction is called by the framework, the CCoeAppUi (from where the application's AppUiderives) creates the control stack, view manag

NewApplication() factory

function is called by the framework, the CCoeAppUi (from where the application's AppUi

derives) creates the control stack, view manager, etc. and the CCoeControl derived class

will create a window (RWindow) to provide a basic view. As you can see, this snippet

provides all this basic functionality at once, without extra bloat such as a control stack,

etc. which aren't needed in this simple case. I haven't included comments, as most of the

code speaks by itself.

当CONE环境建立后设置清理栈活动对象规划器(CCoeScheduler)，建立和文件，窗口服务器的会话(以后

会在调用CCoeEnv::FsSession() 和 CCoeEnv::WsSession()时用到)。接着创建屏幕，窗口组和图形上

下文。再下来，在工厂函数NewApplication()被框架调用后，CCoeAppUi (来自应用程序的AppUi驱动)

建立控件栈，视图管理器等等。CCoeControl的继承类将建立窗口(RWindow)来提供基本的视图。就像你

所看到的，这个程序片断只提供了所以基本的功能，并没有像控件栈等这些多余的东西，它们是这个简

单例子程序中所不需要的。我们并没有注释，因为代码本身已经说明问题了。

LOCAL_C void ExeMainL()

{

RWsSession ws;

User::LeaveIfError(ws.Connect());

CleanupClosePushL(ws);

CWsScreenDevice* screen = new(ELeave) CWsScreenDevice(ws);

CleanupStack::PushL(screen);

screen->Construct();

RWindowGroup wg(ws);

User::LeaveIfError(wg.Construct(reinterpret_cast(&wg), EFalse));

CleanupClosePushL(wg);

wg.SetOrdinalPosition(10, ECoeWinPriorityAlwaysAtFront);

CWindowGc* gc;

User::LeaveIfError(screen->CreateContext(gc));

CleanupStack::PushL(gc);

RWindow window(ws);

User::LeaveIfError(window.Construct(wg, reinterpret_cast(&wg) + 1));

CleanupClosePushL(window);