CException::Delete

請參閱這個功能會檢查，如果是， CException 物件是否在堆積會呼叫物件的 刪除 運算子。

void Delete( );

備註

當刪除 CException 物件時，請使用 刪除 成員函式來刪除例外狀況。 因為 CException 物件在堆疊上，可能是全域物件或建立不要直接使用 刪除 運算子。

您可以指定是否應刪除物件，在建構物件時。 如需詳細資訊，請參閱 CException::CException。

如果您使用 C++ try-catch 機制，您只需呼叫 刪除 。 如果您正在使用 MFC 巨集 TRY 和 CATCH，這些巨集就會自動呼叫這個函式。

範例

CFile* pFile = NULL;

// Constructing a CFile object with this override may throw
// a CFile exception, and won't throw any other exceptions.
// Calling CString::Format() may throw a CMemoryException,
// so we have a catch block for such exceptions, too. Any
// other exception types this function throws will be
// routed to the calling function.

// Note that this example performs the same actions as the 
// example for CATCH, but uses C++ try/catch syntax instead
// of using the MFC TRY/CATCH macros. This sample must use
// CException::Delete() to delete the exception objects
// before closing the catch block, while the CATCH example
// implicitly performs the deletion via the macros.

try
{
   pFile = new CFile(_T("C:\\WINDOWS\\SYSTEM.INI"),
      CFile::modeRead | CFile::shareDenyNone);

   ULONGLONG ullLength = pFile->GetLength();

   CString str;
   str.Format(_T("Your SYSTEM.INI file is %u bytes long."), ullLength);

   AfxMessageBox(str);
}
catch(CFileException* pEx)
{
   // Simply show an error message to the user.

   pEx->ReportError();
   pEx->Delete();
}
catch(CMemoryException* pEx)
{
   // We can't recover from this memory exception, so we'll
   // just terminate the app without any cleanup. Normally, an
   // an application should do everything it possibly can to
   // clean up properly and _not_ call AfxAbort().

   pEx->Delete();
   AfxAbort();
}

// If an exception occurrs in the CFile constructor,
// the language will free the memory allocated by new
// and will not complete the assignment to pFile.
// Thus, our clean-up code needs to test for NULL.

if (pFile != NULL)
{
   pFile->Close();
   delete pFile;
}   

需求

Header: afx.h

請參閱

參考

CException 類別

階層架構圖