CODEWITHSUNDEEP
c++imagevisual-c++visual-studio-2012combobox
Eddie
Eddie

Reputation: 11

Combobox with JPEG images

I've an old Visual C++ program where a Owner Draw Combobox is filled with bitmap images. I need to rewrite the program making the combobox able to load jpeg or png instead of bitmaps. I've read about the CImage class and so i've rewritten the code changing CBitmap to CImage

Loading phase:

...
    CImage image;
    image.Load(filepath);
    _ComboBoxBmp.AddImage(image,filename);
...

Loading function

void CComboBoxBmp::AddImage(CImage img, CString text)
{
    int nIndex = GetCount();
    CImage* image = new CImage;
    image->Attach(img.Detach());
    m_pBmpList.AddTail(image);

    int n = CComboBox::AddString(text);
    if (n != CB_ERR && n != CB_ERRSPACE)
    {
       int r = SetItemData(n, (DWORD)image);
       int Width = image->GetWidth();
       int Height = image->GetHeight();
       m_nItemWidth = 50*Width/100;
       m_nItemHeight = 50*Height/100;

       for (int i = -1; i < GetCount(); i++) 
          SetItemHeight(i, m_nItemHeight + 6);

    }
}

Drawing phase

void CComboBoxBmp::OutputBitmap(LPDRAWITEMSTRUCT lpDIS, bool selected)
{
    const CImage *image = (CImage*)GetItemDataPtr(lpDIS->itemID);
    if (image && image != (const CImage *)(0xffffffff)) 
    {
       CDC* pDC = CDC::FromHandle(lpDIS->hDC);
       CString string; 
       CPoint point;
       point.x = lpDIS->rcItem.left + 2;
       point.y = lpDIS->rcItem.top + ((lpDIS->rcItem.bottom - lpDIS->rcItem.top) / 2) - (m_nItemHeight / 2);
       DrawBitmap(image, pDC, point);
    }
}

The problems are in the last function:

void CComboBoxBmp::DrawBitmap(const CImage *image, CDC *pDC, const CPoint &point)
{
    CDC memDC;
    memDC.CreateCompatibleDC((CDC*)pDC);

    BITMAP bm; 
    ((CBitmap*)bitmap)->GetBitmap(&bm);
    CBitmap *pBmp = memDC.SelectObject((CBitmap*)bitmap);
    pDC->StretchBlt(point.x, point.y, m_nItemWidth, m_nItemHeight, &memDC, 0, 0, bm.bmWidth, bm.bmHeight, SRCCOPY );
    memDC.SelectObject(pBmp);

}

I don't know how to rewrite it because CDC::SelectObject accepts CBitmap but not CImages and all that i can obtain avter after several attempts is a dropdown list from the combobox with all blank images

Anyone can help to find a similar function SelectObject for the CImage class?

Upvotes: 1

Views: 773

Answers (1)

hyun
hyun

Reputation: 2143

You can use CBitmap::FromHandle for conversion from CImage to CBitmap. CImage class has an operator HBITMAP(), so it is available.

CBitmap::FromHandle

CImage image;
// ...
CBitmap* pBitmap = CBitmap::FromHandle(image);

Upvotes: 0

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