我正在VS2010中将32位代码移植到64位代码。我的应用程序在尝试打开其中一个对话框时崩溃了,但我发现它在32位配置中运行得很好,但在64位配置中却不行。我发现有一个包含字符数组的对象数组,64位平台中的数据不正确。假设有一个字符串列表:红色,黑色,。。。。在32位中,列表显示正确,但在64位中,第二个对象的字符指针指向黑色的k,即实际数据前4个字节。对象大小在32位平台中为144字节,但在64位平台中,每个对象的大小为148字节。
BOOL SomeDlg::OnInitDialog( HWND hwnd, HWND hwndFocus, LPARAM lParam )
{
MEMBERASSERT();
CABCDialog::OnInitDialog( hwnd, hwndFocus, lParam );
int nHeight = ListBox_GetItemHeight( GetDlgItem(hwnd, IDC_DUMMYLIST), -1 );
m_myLst.SetItemHeight(-1, nHeight);
m_ClrLst.SetItemHeight(-1, nHeight);
char smyItem[64];
for (UINT i=0; i < 10; i++)
{
LoadString(g_hInstance, IDS_COLORNAMES+i, smyItem, ELEMENTS_IN(smyItem));
m_ZAItems[i].SetColor(m_pSettings->m_rgbColors[i]);
m_ZAItems[i].SetText(smyItem);
//debug issue, check size of object
int a = sizeof(m_ZAItems[i]);
m_myLst.AddItem( &m_ZAItems[i] );
}
//some other stuff
}
class SomeDlg : public CABCDialog
{
private:
MyDrwaLstBox m_myLst;
My_ColorComboBox m_ClrLst;
My_ColorText m_ZAItems[11];
private:
SomeDlg();
SomeDlg(const SomeDlg &);
const SomeDlg &operator=(const SomeDlg &);
public:
SomeDlg(HWND hwndZW, MCURRENT* pSettings , LPCSTR szName );
virtual void Notification( ADM_Wnd *pWnd, UINT uID, int nNotificationCode, LPARAM lData );
virtual BOOL OnInitDialog( HWND hwnd, HWND hwndFocus, LPARAM lParam );
};
class MyDrwaLstBox : public MY_ListBox
{
protected:
BOOL m_bpmn;
private:
MyDrwaLstBox( const MyDrwaLstBox& );
const MyDrwaLstBox & operator=( const MyDrwaLstBox & );
public:
MyDrwaLstBox ();
virtual void OnDrawItem( HWND hwnd,
const DRAWITEMSTRUCT * lpDrawItem );
};
class My_ColorText : public My_Color
{
private:
enum { txtLen = 128 };
TCHAR m_szText[ txtLen ];
My_ColorText ( const My_ColorText & );
const My_ColorText &operator=( const My_ColorText & );
public:
My_ColorText ();
My_ColorText ( COLORREF rgbColor, LPCTSTR pszText );
void SetText( LPCTSTR pszText );
void SetText( HINSTANCE hInstance, UINT uID );
LPCTSTR GetText();
virtual void Draw( HDC hDC, RECT rRect, BOOL bChecked, BOOL bDisabled,
BOOL bFocus, BOOL bGrayed, BOOL bSelected );
};
My_ColorText::My_ColorText()
{
m_szText[0] = ' ';
}
My_ColorText::My_ColorText( COLORREF rgbColor, LPCTSTR pszText )
: My_Color( rgbColor )
{
MDC_strncpyz( m_szText, pszText );
}
void My_ColorTex::SetText( LPCTSTR pszText )
{
MDC_strncpyz( m_szText, pszText );
}
void My_ColorText::SetText( HINSTANCE hInstance, UINT uID )
{
*m_szText = ' ';
LoadString( hInstance, uID, m_szText, ELEMENTS_IN( m_szText ) );
}
LPCTSTR My_ColorText::GetText()
{
return m_szText;
}
template <size_t size>
LPSTR MDC_strncpyz(CHAR (&dest)[size], LPCSTR srce) { return MDC_strncpyz(dest, srce, size); }
class My_Color : public My_DrawItem
{
private:
COLORREF m_rgbColor;
private:
My_Color( const My_Color & );
const My_Color & operator=( const My_Color & );
public:
My_Color( void );
My_Color( COLORREF rgbColor );
virtual void Draw( HDC hDC,
RECT rRect,
BOOL bChecked,
BOOL bDisabled,
BOOL bFocus,
BOOL bGrayed,
BOOL bSelected );
};
My_Color::My_Color void )
: m_rgbColor( RGB_BLACK )
{
}
My_Color::My_Color( COLORREF rgbColor )
: m_rgbColor( rgbColor )
{
}
class My_DrawItem
{
protected:
BOOL m_bInListBox;
DWORD m_dwUser;
private:
My_DrawItem( const My_DrawItem & );
const My_DrawItem & operator=( const My_DrawItem & );
public:
My_DrawItem();
virtual ~My_DrawItem();
virtual void Draw( HDC hDC,
RECT rRect,
BOOL bChecked,
BOOL bDisabled,
BOOL bFocus,
BOOL bGrayed,
BOOL bSelected );
};
My_DrawItem::My_DrawItem()
: m_bInListBox( FALSE ),
m_dwUser( 0 )
{
}
"SomeDlg"类包含My_ColorComboBox类的对象,而My_ColorText类又包含对象的数组。当通过My_ColorComboBox类调用My_ColorText类的构造函数时,m_ColorItems[0]的m_szText和m_ColorItems[1]的m_szText的基址之差等于152字节。意味着My_ColorText()构造函数为m_szText变量分配152字节差的基地址。但是当通过SomeDlg类调用My_ColorText类的构造函数时,则m_ZAItems[0]的m_szText和m_ZAItems[1]的m_szText的基址之差等于148字节。因此,字符串并没有被插入到152字节差的适当位置。
当我检查sizeof(My_ColorText)时,在这两种情况下,它都会给我152个字节。
我在堆上创建了对象,而不是在堆栈上创建。下面的行已经添加以解决问题。
for (UINT i=0; i < 10; i++)
{
LoadString(g_hInstance, IDS_COLORNAMES+i, smyItem, ELEMENTS_IN(smyItem));
//m_ZAItems[i].SetColor(m_pSettings->m_rgbColors[i]);
//m_ZAItems[i].SetText(smyItem);
myLst.AddItem( new My_ColorText( m_pSettings->m_rgbColors[i], smyItem ) );
}