LPlayBack::GetIndex

#include "ltwrappr.h"

virtual L_INT LPlayBack::GetIndex()

Gets the list index of the current bitmap during animation playback.

Returns

The index of the current bitmap.

Required DLLs and Libraries

LTDIS
LTFIL

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:

Class Members

Topics:

Raster Image Functions: Creating and Maintaining Lists of Images

 

Implementing Animation

Example

This example uses LPlayBack::GetIndex and LPlayBack::SetIndex to skip bitmaps during a playback. 

L_INT LPlayBack__GetIndexExample(HWND hWnd, L_TCHAR *pszFileName) 
 
{ 
   L_INT nRet; 
   L_UINT uState; /* Next state in the playback */ 
   RECT rcUpdate; /* Source clipping rectangle used in playback */ 
   RECT rcDisplay; /* Display rectangle used in playback */ 
   HDC hdc; /* Device context of the current window */ 
   L_UINT uIndex = 0; /* Current index to the bitmap list */ 
   L_UINT uCount = 0; /* Number of bitmaps in the list */ 
   LBitmapBase TargetBitmap; 
   LBitmapList BitmapList; 
   LPlayBack   PlayBack ;     /* Animation playback */ 
 
   /* Create the bitmap list from the input file (GIF or AVI) */ 
 
   nRet = BitmapList.Load (pszFileName); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Set the background bitmap*/ 
   nRet = TargetBitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp"))); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Use the client area as the display rectangle */ 
   GetClientRect(hWnd,&rcDisplay); 
 
   /* Get the number of bitmaps in the list */ 
   uCount = BitmapList.GetItemsCount();  
 
   /* Create and run the playback */ 
   nRet = PlayBack.Create(&TargetBitmap, &BitmapList); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   do 
   { 
      uState = PlayBack.Process(); 
      switch(uState) 
      { 
      case PLAYSTATE_PRERENDER: 
         uIndex = PlayBack.GetIndex(); 
         nRet = PlayBack.SetIndex( ++uIndex); 
         if(nRet != SUCCESS) 
            return nRet; 
         break; 
 
      case PLAYSTATE_POSTRENDER: 
         nRet = PlayBack.GetUpdateRect(&rcUpdate, TRUE); 
         if(nRet != SUCCESS) 
            return nRet; 
         hdc = GetDC(hWnd); 
 
         nRet = PlayBack.GetBitmap()->SetClipSrcRect(&rcUpdate); 
         if(nRet != SUCCESS) 
            return nRet; 
 
         nRet = PlayBack.GetBitmap()->SetDstRect(&rcDisplay); 
         if(nRet != SUCCESS) 
            return nRet; 
 
         nRet = PlayBack.GetBitmap()->SetClipDstRect(&rcDisplay); 
         if(nRet != SUCCESS) 
            return nRet; 
 
         PlayBack.GetBitmap()->Paint()->SetDC(hdc); 
 
         PlayBack.GetBitmap()->CreatePaintPalette (hdc); 
 
         nRet = PlayBack.GetBitmap()->Paint()->PaintDC(); 
         if(nRet != SUCCESS) 
            return nRet; 
 
         ReleaseDC(hWnd, hdc); 
 
         break; 
      } 
 
   } while(uIndex < uCount); 
 
   return SUCCESS; 
}

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