L_AnnSaveMemory

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnSaveMemory(hObject, uFormat, fSelected, phMem, puMemSize, pSaveOptions)

Saves the specified annotations to a file in memory.

Parameters

HANNOBJECT hObject

Handle to the root annotation object that includes all objects to save in the file. This typically is a container object.

L_UINT uFormat

Format for saving annotation data. Possible values are:

L_BOOL fSelected

Flag that indicates which objects to save. Possible values are:

HGLOBAL *phMem

Address of a variable to be updated with the memory handle. This function uses the handle to allocate the memory. It unlocks the memory upon completion of the save.

L_SIZE_T *puMemSize

Address of a variable to be updated with the size of the file.

pSAVEFILEOPTION pSaveOptions

Pointer to a SAVEFILEOPTION structure that contains optional extended save options. This information is used to add annotation pages or replace annotation pages in a multipage annotation file. Pass NULL to save a one page annotation file.

Returns

Comments

In version 15.0, the text based format ANNFMT_XML is replacing ANNFMT_NATIVE and ANNFMT_ENCODED.  Note that ANNFMT_NATIVE and ANNFMT_ENCODED are no longer supported as options with L_AnnSave, L_AnnSaveOffset, and L_AnnSaveMemory.

For backward compatibility, this latest version of LEADTOOLS can read the discontinued formats (ANNFMT_NATIVE and ANNFMT_ENCODED) with the following functions:

• L_AnnLoad
• L_AnnLoadOffset
• L_AnnLoadMemory
• L_AnnDeletePage
• L_AnnDeletePageOffset
• L_AnnDeletePageMemory

The ANNFMT_XML format offers many advantages over the older annotation formats:

• Both forward and backward compatible.
• It is human readable.
• It can be easily modified using a standard text editor (i.e. notepad.exe).
• It can be easily parsed using any standard XML parser.
• It can be used with any of the growing number of utilities that work with XML.

Save annotations in the WMF format only for use in another application. LEADTOOLS reads annotations only in the native format.

To retain scaling and positioning information, this function always saves the root container, along with the specified object or selected objects. Use the hObject and fSelected parameters as follows:

• To save the specified object, set hObject to that object and set fSelected to FALSE.
• To save only selected objects in a container, set hObject to the container and set fSelected to TRUE.
• To save all objects in a container, set hObject to the container and set fSelected to FALSE.
• L_AnnSaveTag is an alternative to L_AnnSaveMemory and L_AnnSetTag, if you are going to save it as a TIF or WANG tag format

Both the ANNFMT_TIFFTAG and the ANNFMT_WANGTAG can be saved inside a TIFF file using L_SetTag with uTag set to ANNTAG_TIFF and uType set to TAG_BYTE.

To detect whether a TIF file has annotation information, you should call L_ReadFileTag and see if ANNTAG_TYPE is present.

If uFormat is ANNFMT_XML, phMem is updated with a memory handle to the annotation file in memory.

If uFormat is ANNFMT_TIFFTAG or ANNFMT_WANGTAG, phMem is updated with a memory handle to the tag.

If you save a memory handle to a tag in TIF or WANG format, using L_AnnSaveMemory, you must write the memory handle to the tag into a file using L_SetTag and L_SaveBitmapMemory before you can load it using the L_AnnLoadMemory function.

If this function returns SUCCESS and phMem is updated with NULL, there are no annotations objects to save.

The information in the SAVEFILEOPTION structure can be used to add new pages or replace existing pages in a multipage annotation file of type ANNFMT_XML. Note that all the pages of an annotation multipage file must be all of type ANNFMT_XML. An annotation file cannot contain pages of different format types.

To insert new pages to an annotation multipage file:

1. Declare a variable of type SAVEFILEOPTION.
2. Set the SAVEFILEOPTION.uFlags field to ESO_INSERTPAGE.
3. Set the SAVEFILEOPTION.PageNumber field to the location for insertion. The new page will be inserted in front of the page specified in the PageNumber field.

To replace an existing page in an annotation multipage file:

1. Declare a variable of type SAVEFILEOPTION.
2. Set the SAVEFILEOPTION.uFlags field to ESO_REPLACEPAGE.
3. Set the SAVEFILEOPTION.PageNumber field to the page to replace.

To delete a page from an annotation multipage file, use L_AnnDeletePage, L_AnnDeletePageMemory, L_AnnDeletePageOffset.

When adding or replacing an annotation page in an existing memory file, pass the address of a valid HGLOBAL hMem (non zero). When creating a new memory file, declare a variable of type HGLOBAL and set it to zero before passing the address to L_AnnSaveMemory.

Required DLLs and Libraries

• LTANN
• 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.

L_INT AnnSaveMemoryExample(HWND       hWnd,HANNOBJECT hContainer) 
{ 
   HANNOBJECT  TmpContainer;  /* Temporary container for the annotations */ 
   HGLOBAL     hTag;          /* Memory handle */ 
   L_SIZE_T    zMemSize;      /* Size of the data in memory */ 
   L_UCHAR*    pData;         /* Pointer to the data in memory */ 
   L_INT       nRet; 
   HDC         hdc; 
   RECT        rAnnBounds; 
   RECT        rAnnBoundsName; 
 
   /* Load the initial annotations  */ 
   nRet = L_AnnLoad(MAKE_IMAGE_PATH(TEXT("cannon.ann")), &TmpContainer, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
   /* Save the annotations as a TIFF TAG in memory */ 
   hTag = 0; 
   nRet = L_AnnSaveMemory(TmpContainer, ANNFMT_TIFFTAG, FALSE, &hTag, &zMemSize, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Get the pointer to the memory-resident tag */ 
   pData = (L_UCHAR*) GlobalLock (hTag); 
 
   /* Set the tag so when the bitmap is saved as TIFF, the tag 
      is also saved */ 
   nRet = L_SetTag(ANNTAG_TIFF, TAG_BYTE, (L_UINT) zMemSize, pData); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   L_AnnDestroy(TmpContainer, ANNFLAG_RECURSE); 
 
   /* Load the new file from memory  */ 
   nRet = L_AnnLoadMemory(pData, zMemSize, &TmpContainer, NULL); 
    
   if (nRet == SUCCESS) 
   { 
     /* Insert the annotations  into the main container, hContainer, so they will be active. */ 
     nRet = L_AnnInsert(hContainer, TmpContainer, TRUE); 
     if(nRet != SUCCESS) 
        return nRet; 
     hdc = GetDC(hWnd); 
     nRet = L_AnnGetBoundingRect(hContainer, &rAnnBounds, &rAnnBoundsName); 
     if(nRet != SUCCESS) 
        return nRet; 
     nRet = L_AnnDraw(hdc, &rAnnBounds, hContainer); 
     if(nRet != SUCCESS) 
        return nRet; 
     ReleaseDC(hWnd, hdc); 
   } 
   else 
      return nRet; 
 
   L_AnnDestroy(TmpContainer, ANNFLAG_RECURSE); 
 
   /* Clean up */ 
   GlobalUnlock (hTag); 
   GlobalFree (hTag); 
    
   return SUCCESS; 
}