[u]How do I convert a FreeImage image to a HBITMAP ?
 
FIBITMAP *dib = FreeImage_Load(FIF_PNG, "test.png", PNG_DEFAULT);
// ...
HBITMAP bitmap = CreateDIBitmap(hDC, FreeImage_GetInfoHeader(dib),
	CBM_INIT, FreeImage_GetBits(dib), FreeImage_GetInfo(dib), DIB_RGB_COLORS);
// ...
FreeImage_Unload(dib);
 
[u]How do I convert a HBITMAP to a FreeImage image ?
 
HBITMAP hbmp;
// ...
// the following code assumes that you have a valid HBITMAP loaded into the _
  memory
FIBITMAP *dib = NULL;
if(hbmp) { 
  BITMAP bm;
  GetObject(hbmp, sizeof(BITMAP), (LPSTR) &bm);
  dib = FreeImage_Allocate(bm.bmWidth, bm.bmHeight, bm.bmBitsPixel);
  HDC dc = GetDC(NULL);
  int Success = GetDIBits(dc, hbmp, 0, FreeImage_GetHeight(dib), 
  FreeImage_GetBits(dib), FreeImage_GetInfo(dib), DIB_RGB_COLORS);
  ReleaseDC(NULL, dc);
}
// ...
// don't forget to call FreeImage_Unload when you no longer need the dib
FreeImage_Unload(dib);