這個是此換膚方法的基礎函數: 相關資料：Microsoft Knowledge Base Article - Q79212
///{{{{  for global function
///HOWTO: Drawing Transparent Bitmaps  see: Microsoft Knowledge Base Article - Q79212
// TransparentBlt - Copies a bitmap transparently onto the destination DC
// hdcDes - Handle to destination device context
// xDes  - x-coordinate of destination rectangle's upper-left corner
// yDes  - y-coordinate of destination rectangle's upper-left corner
// width - Width of destination rectangle
// height - height of destination rectangle
// hbmSrc - Handle of the source bitmap
// xSrc  - x-coordinate of source rectangle's upper-left corner
// ySrc  - y-coordinate of source rectangle's upper-left corner
// crTrans  - The transparent color
// hPal     - Logical palette to be used with bitmap. Can be NULL
BOOL TransparentBitBlt(HDC hdcDes,
        int xDes,
        int yDes,
        int width,
        int height,
        HBITMAP hbmSrc,
        int xSrc,
        int ySrc,
        COLORREF crTrans,
        HPALETTE hPal
        )

{
 ASSERT(hdcDes!=NULL);//if(hdcDes == NULL) return FALSE;
 ASSERT(hbmSrc!=NULL);//if(hbmSrc == NULL) return FALSE;

 CDC dc, memDC, maskDC, tempDC;
 dc.Attach(hdcDes);
 maskDC.CreateCompatibleDC(&dc);
 CBitmap maskBmp;
 
 //add these to store return of SelectObject() calls
 CBitmap *pOldMemBmp = NULL;
 CBitmap *pOldMaskBmp = NULL;
 HBITMAP hOldTempBmp = NULL;
 
 memDC.CreateCompatibleDC(&dc);
 tempDC.CreateCompatibleDC(&dc);
 CBitmap bmpImage;
 bmpImage.CreateCompatibleBitmap(&dc, width, height);
 pOldMemBmp = memDC.SelectObject(&bmpImage);
 
 // Select and realize the palette
 if( dc.GetDeviceCaps(RASTERCAPS) & RC_PALETTE && hPal )
 {
  ::SelectPalette(dc, hPal, FALSE);
  dc.RealizePalette();
  
  ::SelectPalette(memDC, hPal, FALSE);
 }
 
 hOldTempBmp = (HBITMAP)::SelectObject(tempDC.m_hDC, hbmSrc);
 
 memDC.BitBlt(0, 0, width, height, &tempDC, xSrc, ySrc, SRCCOPY);
 
 // Create monochrome bitmap for the mask
 maskBmp.CreateBitmap(width, height, 1, 1, NULL);
 pOldMaskBmp = maskDC.SelectObject(&maskBmp);
 memDC.SetBkColor(crTrans);
 
 // Create the mask from the memory DC
 maskDC.BitBlt(0, 0, width, height, &memDC, 0, 0, SRCCOPY);
 
 // Set the background in memDC to black. Using SRCPAINT with black
 // and any other color results in the other color, thus making
 // black the transparent color
 memDC.SetBkColor(RGB(0,0,0));
 memDC.SetTextColor(RGB(255,255,255));
 memDC.BitBlt(0, 0, width, height, &maskDC, 0, 0, SRCAND);
 
 // Set the foreground to black. See comment above.
 dc.SetBkColor(RGB(255,255,255));
 dc.SetTextColor(RGB(0,0,0));
 dc.BitBlt(xDes, yDes, width, height, &maskDC, 0, 0, SRCAND);
 
 // Combine the foreground with the background
 dc.BitBlt(xDes, yDes, width, height, &memDC, 0, 0, SRCPAINT);
 
 
 if (hOldTempBmp)
  ::SelectObject(tempDC.m_hDC, hOldTempBmp);
 if (pOldMaskBmp)
  maskDC.SelectObject(pOldMaskBmp);
 if (pOldMemBmp)
  memDC.SelectObject(pOldMemBmp);
 
 dc.Detach();

 maskBmp.DeleteObject();
 bmpImage.DeleteObject();

 maskDC.DeleteDC();
 memDC.DeleteDC();
 tempDC.DeleteDC();

 pOldMemBmp = NULL;
 pOldMaskBmp = NULL;
 hOldTempBmp = NULL;

 return TRUE;
}

///}}} for global function

另三個很有意思的類，從高手那“盜”來的，呵呵:

class CWinRect: public CRect
{
public:
 CWinRect(HWND hWnd)
 {
  ::GetWindowRect(hWnd, this);
 }
 CWinRect(const CWnd *pWnd)
 {
  ::GetWindowRect(pWnd->GetSafeHwnd(), this);
 }

};

class CWinText: public CString
{
public:
 CWinText(HWND hWnd)
 {
  (CWnd::FromHandle(hWnd))->GetWindowText(*this); 
 }
 CWinText(const CWnd *pWnd)
 {
  pWnd->GetWindowText(*this);
 }
};

class CClientRect: public CRect
{
public:
 CClientRect(HWND hWnd)
 {
  ::GetClientRect(hWnd, this);
 }
 CClientRect(CWnd *pWnd)
 {
  ::GetClientRect(pWnd->GetSafeHwnd(), this);
 }
};