Combox的Item前如何插入ICON ?

http://www.codeproject.com/combobox/
http://www.codeguru.com/Cpp/controls/combobox/

// IconComboBox.h : header file
//#ifndef _ICONCOMBOBOX_H_
#define _ICONCOMBOBOX_H_//////////////////////////////////////////////////////
//                                                  //
//                   CIconComboBox                  //
//                                                  //
// Copyright (c) Joel Wahlberg ENATOR Networks 1997 //
//               [email protected]            //
//                                                  //
//////////////////////////////////////////////////////class CIconComboBox : public CComboBox
{
// Contruction/Destruction
public:
CIconComboBox();
virtual ~CIconComboBox();// Attributes
public:
CSize m_sizeIcon;// Operations
public:
virtual int AddIcon(LPCTSTR lpszIconFile);
virtual int InsertIcon(int nIndex, LPCTSTR lpszIconFile);
virtual int SelectIcon(LPCTSTR lpszIconFile);
virtual int SelectIcon(int nIndex);
virtual int DeleteIcon(LPCTSTR lpszIconFile);
virtual int DeleteIcon(int nIndex);// Implementation
protected:
virtual void OnOutputIcon(LPDRAWITEMSTRUCT lpDIS, BOOL bSelected);// Overrides
virtual int AddString(LPCTSTR lpszString);
virtual int InsertString(int nIndex, LPCTSTR lpszString);
virtual int DeleteString(int nIndex);
virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMIS);
virtual void DrawItem(LPDRAWITEMSTRUCT lpDIS);
};#endif // _ICONCOMBOBOX_H_

#include "stdafx.h"
#include "IconComboBox.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif//////////////////////////////////////////////////////
//                                                  //
//                   CIconComboBox                  //
//                                                  //
// Copyright (c) Joel Wahlberg ENATOR Networks 1997 //
//               [email protected]            //
//                                                  //
//////////////////////////////////////////////////////CIconComboBox::CIconComboBox()
{
m_sizeIcon.cx = ::GetSystemMetrics(SM_CXICON);
m_sizeIcon.cy = ::GetSystemMetrics(SM_CXICON);
}CIconComboBox::~CIconComboBox()
{
}int CIconComboBox::AddIcon(LPCTSTR lpszIconFile)
{
HICON hIcon = ::ExtractIcon(AfxGetInstanceHandle(), lpszIconFile, 0); if (hIcon == (HICON)1 || hIcon == NULL)
return CB_ERR; int nIndex = CComboBox::AddString(lpszIconFile); if (nIndex != CB_ERR && nIndex != CB_ERRSPACE)
SetItemData(nIndex, (DWORD)hIcon);

return nIndex;
}int CIconComboBox::InsertIcon(int nIndex, LPCTSTR lpszIconFile)
{
HICON hIcon = ::ExtractIcon(AfxGetInstanceHandle(), lpszIconFile, 0); if (hIcon == (HICON)1 || hIcon == NULL)
return CB_ERR; nIndex = CComboBox::InsertString(nIndex, lpszIconFile); if (nIndex != CB_ERR && nIndex != CB_ERRSPACE)
SetItemData(nIndex, (DWORD)hIcon);

return nIndex;
}int CIconComboBox::SelectIcon(LPCTSTR lpszIconFile)
{
int nIndex = CComboBox::FindStringExact(-1, lpszIconFile);

if (nIndex == CB_ERR && CComboBox::GetCount() > 0)
nIndex = 0; // select the first icon if not found return CComboBox::SetCurSel(nIndex);
}int CIconComboBox::SelectIcon(int nIndex)
{
return CComboBox::SetCurSel(nIndex);
}int CIconComboBox::DeleteIcon(LPCTSTR lpszIconFile)
{
int nIndex = CComboBox::FindStringExact(-1, lpszIconFile); return CComboBox::DeleteString(nIndex);
}int CIconComboBox::DeleteIcon(int nIndex)
{
return CComboBox::DeleteString(nIndex);
}int CIconComboBox::AddString(LPCTSTR lpszString)
{
ASSERT(FALSE); // cannot add strings
return CB_ERR;
}int CIconComboBox::InsertString(int nIndex, LPCTSTR lpszString)
{
ASSERT(FALSE); // cannot insert strings
return CB_ERR;
}int CIconComboBox::DeleteString(int nIndex)
{
ASSERT(FALSE); // cannot delete strings
return CB_ERR;
}void CIconComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMIS)
{
lpMIS->itemHeight = (m_sizeIcon.cy + 2);
}void CIconComboBox::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
    CDC* pDC = CDC::FromHandle(lpDIS->hDC); if (!IsWindowEnabled())
{
        CBrush brDisabled(RGB(192,192,192)); // light gray
CBrush* pOldBrush = pDC->SelectObject(&brDisabled);
CPen penDisabled(PS_SOLID, 1, RGB(192,192,192));
        CPen* pOldPen = pDC->SelectObject(&penDisabled);
        OnOutputIcon(lpDIS, FALSE);
pDC->SelectObject(pOldBrush);
pDC->SelectObject(pOldPen);
return;
} // Selected
if ((lpDIS->itemState & ODS_SELECTED)
&& (lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
{
CBrush brHighlight(::GetSysColor(COLOR_HIGHLIGHT));
CBrush* pOldBrush = pDC->SelectObject(&brHighlight);
CPen penHighlight(PS_SOLID, 1, ::GetSysColor(COLOR_HIGHLIGHT));
CPen* pOldPen = pDC->SelectObject(&penHighlight);
pDC->Rectangle(&lpDIS->rcItem);
pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
        pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
OnOutputIcon(lpDIS, TRUE);
pDC->SelectObject(pOldBrush);
pDC->SelectObject(pOldPen);
} // De-Selected
if (!(lpDIS->itemState & ODS_SELECTED)
&& (lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
{
CBrush brWindow(::GetSysColor(COLOR_WINDOW));
CBrush* pOldBrush = pDC->SelectObject(&brWindow);
CPen penHighlight(PS_SOLID, 1, ::GetSysColor(COLOR_WINDOW));
CPen* pOldPen = pDC->SelectObject(&penHighlight);
pDC->Rectangle(&lpDIS->rcItem);
pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
        pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
OnOutputIcon(lpDIS, FALSE);
pDC->SelectObject(pOldBrush);
pDC->SelectObject(pOldPen);
}    // Focus
    if (lpDIS->itemAction & ODA_FOCUS)
{
        pDC->DrawFocusRect(&lpDIS->rcItem);
    }
}void CIconComboBox::OnOutputIcon(LPDRAWITEMSTRUCT lpDIS, BOOL bSelected)
{
if (GetCurSel() == CB_ERR || GetCount() == 0)
return; // no item selected

CDC* pDC = CDC::FromHandle(lpDIS->hDC); HICON hIcon = (HICON)lpDIS->itemData;
ASSERT(hIcon != NULL); int x = lpDIS->rcItem.left + ((lpDIS->rcItem.right - lpDIS->rcItem.left) / 2) - (m_sizeIcon.cx / 2);
int y = lpDIS->rcItem.top + ((lpDIS->rcItem.bottom - lpDIS->rcItem.top) / 2) - (m_sizeIcon.cy / 2);

pDC->DrawIcon(x, y, hIcon);
}

实现本程序方法如下：在工程文件中包含IconComboBox.cpp和IconComboBox.h。
在资源编辑器中，创建一个一般的组合框，并设置它具有下面风格： DropList, OwnerDraw Variable, Has Strings。
用ClassWizard创建一个控件成员变量。
替换CComboBox为CIconComboBox。
在IconComboBox创建后，使用下面的方法来插入、选择和删除图标：public:
virtual int AddIcon(LPCTSTR lpszIconFileName);
virtual int InsertIcon(int nIndex, LPCTSTR lpszIconFileName);
virtual int SelectIcon(LPCTSTR lpszIconFileName);
virtual int SelectIcon(int nIndex);
virtual int DeleteIcon(LPCTSTR lpszIconFileName);
virtual int DeleteIcon(int nIndex);下面方法可以被重载，以按不同的方式绘制图标。缺省情况下是，图标在组合框中中对齐。protected:
virtual void OnOutputIcon(LPDRAWITEMSTRUCT lpDIS, BOOL bSelected);

请问striking(硬撑者):这个类怎么用，我加了以后就没有AddString属性了啊。

要稍加修改.
int CIconComboBox::AddString(LPCTSTR lpszString)
{
ASSERT(FALSE); // cannot add strings
return CB_ERR;
}
这边要修改.还有DRAWITEM要改.

我的程序OwnerDraw不能设置为Variable晕掉。

调试易

Combox的Item前如何插入ICON ?

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