HICON与HBITMAP相互转换

HICON HICONFromCBitmap( CBitmap& bitmap)
{
BITMAP bmp;
bitmap.GetBitmap(&bmp);

HDC hDC = ::GetDC(NULL);
HBITMAP hbmMask = ::CreateCompatibleBitmap(hDC,
bmp.bmWidth, bmp.bmHeight);

ICONINFO ii = {0};
ii.fIcon = TRUE;
ii.hbmColor = bitmap;
ii.hbmMask = hbmMask;

HICON hIcon = ::CreateIconIndirect(&ii);  // 一旦不再需要，注意用DestroyIcon函数释放占用的内存及资源，否则会导致内存和GDI资源的泄漏
::DeleteObject(hbmMask);

::ReleaseDC(NULL, hDC);
return hIcon;
}

#include <gdiplus.h>
#pragma comment(lib,"GdiPlus.lib")

HICON CreateIcon(HBITMAP hBitmap)
{
Gdiplus::Bitmap* pTmpBitmap=Gdiplus::Bitmap::FromHBITMAP(hBitmap,NULL);
HICON hIcon=NULL;
pTmpBitmap->GetHICON(&hIcon);
delete pTmpBitmap;   // 注意此处一定要delete掉，因为调用Gdiplus::Bitmap::FromHBITMAP方法会在函数内部new一个Bitmap对象，外部要将其释放掉
return hIcon;
}

HBITMAP ConvertIconToBitmap(HICON  hIcon)
{
HBITMAP   hBmp;
BITMAP   bmp;
CDC   bmpDC;
CDC   iconDC;
ICONINFO csII;
int bRetValue = ::GetIconInfo(hIcon, &csII);
if (bRetValue == FALSE)   return NULL;

HDC hDC = ::GetDC(NULL);
bmpDC.Attach(hDC);
iconDC.CreateCompatibleDC(&bmpDC);
if (::GetObject(csII.hbmColor,   sizeof(BITMAP),   &bmp))
{
DWORD       dwWidth   =   csII.xHotspot*2;
DWORD       dwHeight   =   csII.yHotspot*2;
hBmp=   ::CreateBitmap(dwWidth,   dwHeight,   bmp.bmPlanes,
bmp.bmBitsPixel,   NULL);
iconDC.SelectObject(csII.hbmColor);
bmpDC.SelectObject(hBmp);
bmpDC.BitBlt(0,0,dwWidth,dwHeight,&iconDC,0,0,SRCCOPY);
return   hBmp;
}

return NULL;
}