如何判断剪贴板是否为空？

CPlainText* BPlainText = CPlainText::NewL(); CleanupStack::PushL(BPlainText); CClipboard* cb = CClipboard::NewForReadingL( CCoeEnv::Static()->FsSession()); CleanupStack::PushL(cb); cb->StreamDictionary().At(KClipboardUidTypePlainText); BPlainText->PasteFromStoreL(cb->Store(), cb->StreamDictionary(), 0); // the text is now inside the BPlainText cb->CommitL(); CleanupStack::PopAndDestroy(); // cb CleanupStack::Pop(); // BPlainText TInt aint=BPlainText->WordCount(); TBuf<32> abuf; abuf.Format(_L("#%d##"),aint); WriteLog_S(abuf);这段代码在模拟器上显示 system error －21 （KErrAccessDenied）是权限不够吗？

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