The first one does not give you any control over which part of the screen that you can copy, so it is probably best to use the 2nd one. The 1st parameter is the position in your bitmap that you want the part of the screen to go. The 2nd one is a screen gc, you can create one of these using the screen device available from the function: iFunctions->ScreenDevice(), except you will need to cast away the const'ness. The 3rd parameter is the rectangle on the screen that you want to copy. If you want to copy the entire content of the window that you are an Anim over then you will need to get the client side to tell you where it is. There is a function that can tell you the size of your window, but not one for the location: iFunctions->WindowSize() (or for post ER5 code iWindowFunctions->WindowSize()). Thus your code might look something like this:

TSize size=iFunctions->WindowSize(); //Ask the Anim the size of your window
iBitmap=new(ELeave) CFbsBitmap(); //Create a bitmap to store the window content
User::LeaveIfError(iBitmap->Create(size,EGray4)); //ditto
iBitmapDevice=CFbsBitmapDevice::NewL(iBitmap); //Create a bitmap device so we can draw to the bitmap
iBitmapGc=CFbsBitGc::NewL(); //Create a GC to draw to the bitmap
iBitmapGc->Activate(iBitmapDevice); //Active it on the bitmap we just created
CFbsBitGc* gc;
User::LeaveIfError(CONST_CAST(CFbsScreenDevice*,iFunctions->ScreenDevice())->CreateContext(gc)); //Create a screen gc
iBitmapGc->BitBlt(TPoint(0,0),*gc,TRect(iWindowTopLeft,size)); //Copy the window content