Replaces a color with a fill color in a given area of a Device Context

//! Replaces a color with a fill color in a given area of a
//! Device Context
//!
//! \param hDC : Specifies the Device Context
//! \param rcReplaceArea : Specifies the portion of the DC area
//! to apply the replace operation
//! \param clrColorReplace : Specifies the color to be replaced
//! \param clrColorFill : Specifies the fill color

void ReplaceColor(HDC hDC, CRect rcReplaceArea, COLORREF clrColorReplace,
COLORREF clrColorFill)
{
CDC* pDC = CDC::FromHandle(hDC);

CPoint pt = rcReplaceArea.TopLeft();

CDC memDCMonoChrome;
memDCMonoChrome.CreateCompatibleDC(pDC);
CBitmap bmpMonoChrome;
bmpMonoChrome.CreateCompatibleBitmap(&memDCMonoChrome,
rcReplaceArea.Width(), rcReplaceArea.Height());
CBitmap* pOldMonoBitmap =
memDCMonoChrome.SelectObject(&bmpMonoChrome);

COLORREF nOldBkColor = pDC->SetBkColor(clrColorReplace);
// BLT to mono dc so that mask color will have 1 set and the other colors 0
memDCMonoChrome.BitBlt(0, 0, rcReplaceArea.Width(),
rcReplaceArea.Height(), pDC, pt.x, pt.y, SRCCOPY);

CDC memDC;
memDC.CreateCompatibleDC(pDC);
CBitmap bmp;
bmp.CreateCompatibleBitmap(pDC, rcReplaceArea.Width(),
rcReplaceArea.Height());
CBitmap* pOldBitmap = memDC.SelectObject(&bmp);

COLORREF nOldMemDCBkColor = memDC.SetBkColor(clrColorFill);
COLORREF nOldMemDCTextColor =
memDC.SetTextColor(RGB(255, 255, 255));
// BLT to mem DC so that the monochrome white is set to fill color and the
// monochrome black is set to white
memDC.BitBlt(0, 0, rcReplaceArea.Width(), rcReplaceArea.Height(),
&memDCMonoChrome, 0, 0, SRCCOPY);

// AND pDC with mem dc so that the replace color part is blackened out and
// all other colors remains same
pDC->BitBlt(pt.x, pt.y, rcReplaceArea.Width(), rcReplaceArea.Height(),
&memDC, 0, 0, SRCAND);

memDC.SetTextColor(RGB(0, 0, 0));
// BLT to mem DC so that the monochrome white is set to fill color and the
// monochrome black is set to black
memDC.BitBlt(0, 0, rcReplaceArea.Width(), rcReplaceArea.Height(),
&memDCMonoChrome, 0, 0, SRCCOPY);

// OR pDC with mem dc so that all colors remains as they where except the
// blackened out (replace color) part receives the fill color
pDC->BitBlt(pt.x, pt.y, rcReplaceArea.Width(), rcReplaceArea.Height(),
&memDC, 0, 0, SRCPAINT);

// Set the original values back
memDC.SetTextColor(nOldMemDCTextColor);
memDC.SetBkColor(nOldMemDCBkColor);

pDC->SetBkColor(nOldBkColor);

// Set the original bitmaps back
memDCMonoChrome.SelectObject(pOldMonoBitmap);
memDC.SelectObject(pOldBitmap);
}

Sequence of messages sent on Double Click Event

1. LButtonDown
2. LButtonUp
3. LButtonDblClick
4. LButtonUp

Wild-Card Comparison

Sometimes we have needed to compare a Wild-Card string in a given string. Here is a handy function for doing this:

int WildCmp(const TCHAR* wild, const TCHAR* string)

{

const TCHAR *cp = NULL, *mp = NULL;

while ((*string) && (*wild != '*'))

{

if ((*wild != *string) && (*wild != '?'))

{

return 0;

}

wild++;

string++;

}

while (*string)

{

if (*wild == '*')

{

if (!*++wild)

{

return 1;

}

mp = wild;

cp = string+1;

}

else if ((*wild == *string) || (*wild == '?'))

{

wild++;

string++;

}

else

{

wild = mp;

string = cp++;

}

}

while (*wild == '*')

{

wild++;

}

return !*wild;

}