Symbian 程序隐藏到后台，返回到主页面，按下特定的键值显示程序。

最新推荐文章于 2023-06-09 18:37:32 发布

原创最新推荐文章于 2023-06-09 18:37:32 发布 · 882 阅读

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CC 4.0 BY-SA版权

文章标签：

#symbian #class #user #任务

本文深入探讨了程序后台管理的关键技术，包括如何将应用隐藏到后台、显示到前台以及通过热键触发特定操作。详细介绍了窗口组、热键捕获器等组件的使用方法，并提供了实例代码解析。

            //------------------------------------------------------程序隐藏到后台-----------------------------------------------------
            TApaTask task(iEikonEnv->WsSession());
            task.SetWgId(CEikonEnv::Static()->RootWin().Identifier());
            task.SendToBackground();

            //HideApplicationFromFSW(ETrue);
            //ETrue的时候，在主界面的任务列表中不显示本程序，EFalse显示本程序


            //------------------------------------------------------程序显示到前台-----------------------------------------------------
            TApaTask task(iEikonEnv->WsSession());
            task.SetWgId(CEikonEnv::Static()->RootWin().Identifier());
            task.BringToForeground();

            //------------------------------------------------------程序后台监听某些键值-----------------------------------------------------
            //这一般都是配合热键而用的，也就是当我隐藏到后台后，返回到主页面上，按下某个特定的键，就会调用此程序。

            //------------------------------------------------------头文件-----------------------------------------------------
#include <w32std.h>
#include <apgwgnam.h> //CApaWindowGroupName
class MKeyCallBack
    {
public:
    virtual TBool KeyCapturedL(TWsEvent aEvent) = 0;
    };

class CHandleItem
    {
public:
    CHandleItem();
    ~CHandleItem();
    TInt iHandle;
    };

class CKeyCapturer : public CActive
    {
public:
    static CKeyCapturer* NewL(MKeyCallBack& aObserver);
    static CKeyCapturer* NewLC(MKeyCallBack& aObserver);
    virtual ~CKeyCapturer();
private:
    CKeyCapturer(MKeyCallBack& aObserver);
    void ConstructL();
    void RunL();
    void DoCancel();
    void Listen();
private:
    MKeyCallBack& iObserver;
    RWsSession iWsSession;
    RWindowGroup iWg;
    RPointerArray<CHandleItem> iHandleArray;
    };



            //------------------------------------------------------定义文件-----------------------------------------------------
            #include "CapturingKeys.h"

CHandleItem::CHandleItem()
    {

    }

CHandleItem::~CHandleItem()
    {

    }

CKeyCapturer* CKeyCapturer::NewL(MKeyCallBack& aObserver)
    {
    CKeyCapturer* self = CKeyCapturer::NewLC(aObserver);
    CleanupStack::Pop(self);
    return self;
    }

CKeyCapturer* CKeyCapturer::NewLC(MKeyCallBack& aObserver)
    {
    CKeyCapturer* self = new (ELeave) CKeyCapturer(aObserver);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

CKeyCapturer::CKeyCapturer(MKeyCallBack& aObserver) :
    CActive(EPriorityStandard), iObserver(aObserver)
    {
    }

CKeyCapturer::~CKeyCapturer()
    {
    /*
    if (iHandle > -1)
    {
    iWg.CancelCaptureKey(iHandle);
    }
    iHandle = -1;
    */

    //注销
    TInt nCount = iHandleArray.Count();
    for (TInt i = 0; i < nCount; i++)
        {
        if (iHandleArray[i]->iHandle > -1)
            {
            iWg.CancelCaptureKey(iHandleArray[i]->iHandle);
            }
        iHandleArray[i]->iHandle = -1;
        }

    //
    iHandleArray.ResetAndDestroy();

    Cancel();

    iWg.Close();
    iWsSession.Close();
    }

void CKeyCapturer::ConstructL()
    {
    CActiveScheduler::Add(this);

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

    iWg = RWindowGroup(iWsSession);
    User::LeaveIfError(iWg.Construct((TUint32) &iWg, EFalse));
    iWg.SetOrdinalPosition(-1);
    iWg.EnableReceiptOfFocus(EFalse);

    CApaWindowGroupName* wn = CApaWindowGroupName::NewLC(iWsSession);
    wn->SetHidden(ETrue);
    wn->SetWindowGroupName(iWg);
    CleanupStack::PopAndDestroy();

    //iHandle = iWg.CaptureKey(EKeyDevice0, 0,0);
    TInt nStart = 14;
    TInt nEnd = 17;

    for (TInt i = nStart; i <= nEnd; i++)
        {
        CHandleItem * pItem = new (ELeave) CHandleItem;
        pItem->iHandle = iWg.CaptureKey(i, 0, 0);
        iHandleArray.Append(pItem);
        }

    nStart = 48;
    nEnd = 57;

    for (TInt i = nStart; i <= nEnd; i++)
        {
        CHandleItem * pItem = new (ELeave) CHandleItem;
        pItem->iHandle = iWg.CaptureKey(i, 0, 0);
        iHandleArray.Append(pItem);
        }

    nStart = 164;
    nEnd = 167;

    for (TInt i = nStart; i <= nEnd; i++)
        {
        CHandleItem * pItem = new (ELeave) CHandleItem;
        pItem->iHandle = iWg.CaptureKey(i, 0, 0);
        iHandleArray.Append(pItem);
        }

    Listen();
    }

void CKeyCapturer::RunL()
    {
    if (iStatus == KErrNone)
        {
        TWsEvent e;
        iWsSession.GetEvent(e);

        if (iObserver.KeyCapturedL(e))
            {
            TInt wgId = iWsSession.GetFocusWindowGroup();
            iWsSession.SendEventToWindowGroup(wgId, e);
            }
        }

    if (iStatus != KErrCancel)
        {
        Listen();
        }
    }

void CKeyCapturer::DoCancel()
    {
    iWsSession.EventReadyCancel();
    }

void CKeyCapturer::Listen()
    {
    iWsSession.EventReady(&iStatus);
    SetActive();
    }