160 lines
4.2 KiB
C++
160 lines
4.2 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1999-2000 Microsoft Corporation
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//
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// Module Name:
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// CStr.cpp
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//
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// Description:
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// Contains the definition of the CStr class.
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//
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// Documentation:
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// TODO: Add pointer to external documentation later.
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//
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// Maintained By:
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// Vij Vasu (Vvasu) 08-MAR-2000
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//
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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// Include Files
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//////////////////////////////////////////////////////////////////////////////
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// The header file of this class
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#include "CStr.h"
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// For the exceptions thrown by CStr
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#include "CException.h"
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// void
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// CStr::LoadString()
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//
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// Description:
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// Lookup a string in a string table using a string id.
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//
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// Arguments:
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// hInstIn
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// Instance handle of the module containing the string table resource.
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//
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// uiStringIdIn
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// Id of the string to look up
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//
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// Return Value:
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// None.
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//
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// Exceptions Thrown:
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// CException
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// If the lookup fails.
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//
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// Remarks:
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// This function cannot load a zero length string.
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//--
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//////////////////////////////////////////////////////////////////////////////
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void
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CStr::LoadString( HINSTANCE hInstIn, UINT nStringIdIn )
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{
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UINT uiCurrentSize = 0;
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TCHAR * pszCurrentString = NULL;
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UINT uiReturnedStringLen = 0;
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do
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{
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// Free the string allocated in the previous iteration.
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delete pszCurrentString;
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// Grow the current string by an arbitrary amount.
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uiCurrentSize += 256;
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pszCurrentString = new TCHAR[ uiCurrentSize ];
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if ( pszCurrentString == NULL )
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{
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THROW_EXCEPTION( E_OUTOFMEMORY );
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} // if: the memory allocation has failed
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uiReturnedStringLen = ::LoadString(
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hInstIn
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, nStringIdIn
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, pszCurrentString
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, uiCurrentSize
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);
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if ( uiReturnedStringLen == 0 )
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{
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HRESULT hrRetVal = TW32( GetLastError() );
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hrRetVal = HRESULT_FROM_WIN32( hrRetVal );
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delete pszCurrentString;
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THROW_EXCEPTION( hrRetVal );
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} // if: LoadString() had an error
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++uiReturnedStringLen;
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}
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while( uiCurrentSize <= uiReturnedStringLen );
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// Free the existing string.
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Free();
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// Store details about the newly allocated string in the member variables.
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m_pszData = pszCurrentString;
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m_nLen = uiReturnedStringLen;
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m_cchBufferSize = uiCurrentSize;
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} //*** CStr::LoadString()
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//////////////////////////////////////////////////////////////////////////////
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//++
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//
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// void
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// CStr::AllocateBuffer( UINT cchBufferSizeIn )
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//
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// Description:
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// Allocate a buffer of cchBufferSizeIn characters. If the existing buffer is not
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// smaller than cchBufferSizeIn characters, nothing is done. Otherwise, a new
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// buffer is allocated and the old contents are filled into this buffer.
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//
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// Arguments:
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// cchBufferSizeIn
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// Required size of the new buffer in characters.
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//
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// Return Value:
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// None.
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//
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// Exceptions Thrown:
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// CException
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// If the memory allocation fails.
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//
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//--
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//////////////////////////////////////////////////////////////////////////////
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void
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CStr::AllocateBuffer( UINT cchBufferSizeIn )
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{
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// Check if the buffer is already big enough
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if ( m_cchBufferSize < cchBufferSizeIn )
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{
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TCHAR * psz = new TCHAR[ cchBufferSizeIn ];
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if ( psz == NULL )
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{
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THROW_EXCEPTION( E_OUTOFMEMORY );
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} // if: memory allocation failed
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// Copy the old data into the new buffer.
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_tcsncpy( psz, m_pszData, m_nLen + 1 );
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if ( m_pszData != &ms_chNull )
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{
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delete m_pszData;
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} // if: the pointer was dynamically allocated
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m_pszData = psz;
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m_cchBufferSize = cchBufferSizeIn;
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}
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} //*** AllocateBuffer()
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