In This Topic ▼

LAnnContainer::FileInfoMemory

Summary

Loads information about the annotation file located in memory into the specified ANNFILEINFO structure.

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnContainer::FileInfoMemory(pMem, uMemSize, pAnnFileInfo, uStructSize)

Parameters

L_UCHAR * pMem

Pointer to the location in memory of the image file.

L_UINT32 uMemSize

The size, in bytes, of the file referenced by pMem.

pANNFILEINFO pAnnFileInfo

Pointer to the ANNFILEINFO structure to be filled with data from the image file.

L_UINT uStructSize

Size in bytes, of the structure pointed to by pAnnFileInfo, for versioning. Use sizeof(ANNFILEINFO).

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function can be used to get information about a LEAD annotation file that is stored in memory.

To use this function, do the following:

Assign variables for the memory location of the file located in memory and for its size.
Declare a variable of type ANNFILEINFO.
Fill in the nSize and nOffset fields of the ANNFILEINFO variable. The field nSize should contain the size of the ANNFILEINFO structure in bytes. The nOffset field should contain the byte location of the first byte of the annotation file.
Call the LAnnContainer::FileInfoMemory function, passing the pointer to the file in memory, the address of the ANNFILEINFO variable, and the file size as parameters.
Get the image information from the fields described in ANNFILEINFO structure.

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.

Example

L_INT LAnnContainer_FileInfoMemoryExample(LAnnContainer & AnnContainer, L_UINT uFormat) 
{ 
   L_INT nRet; 
 
   SAVEFILEOPTION SaveFileOption; 
 
   ANNFILEINFO AnnFileInfo; 
 
   L_TCHAR szMessage[256]; 
 
   L_TCHAR * szFormat; 
 
   HGLOBAL hMem = NULL; 
 
   L_SIZE_T uMemSize; 
 
   L_UCHAR * pMem; 
 
 
 
   // Save the annotations as the first page of the file in memory 
   nRet = AnnContainer.SaveMemory(uFormat,FALSE, &hMem, &uMemSize); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   // Flip and then save as the second page 
 
   nRet = AnnContainer.Flip(NULL, ANNFLAG_RECURSE); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   SaveFileOption.uStructSize = sizeof(SAVEFILEOPTION); 
 
   SaveFileOption.Flags = ESO_INSERTPAGE; 
 
   SaveFileOption.PageNumber = 2; 
 
   nRet = AnnContainer.SaveMemory(uFormat, FALSE, &hMem, &uMemSize, &SaveFileOption); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   // Rotate and then save as the third page 
 
   nRet = AnnContainer.Rotate(45.0, NULL, ANNFLAG_RECURSE); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   SaveFileOption.PageNumber = 3; 
 
   nRet = AnnContainer.SaveMemory(uFormat, FALSE, &hMem, &uMemSize, &SaveFileOption); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   // Get information about the file in memory 
 
   AnnFileInfo.uStructSize = sizeof(ANNFILEINFO); 
 
   AnnFileInfo.nOffset = 0; 
 
   pMem = (L_UCHAR *) GlobalLock(hMem); 
 
   nRet =AnnContainer.FileInfoMemory(pMem, (L_UINT)uMemSize, &AnnFileInfo, sizeof(AnnFileInfo)); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   GlobalUnlock(hMem); 
 
 
 
   switch (AnnFileInfo.uFormat) 
   { 
 
      case ANNFMT_NATIVE: 
         szFormat = TEXT("ANNFMT_NATIVE"); 
         break; 
      case ANNFMT_WMF: 
         szFormat = TEXT("ANNFMT_WMF"); 
         break; 
      case ANNFMT_ENCODED: 
         szFormat = TEXT("ANNFMT_ENCODED"); 
         break; 
      default: 
         szFormat = TEXT("Unknown"); 
      break; 
   } 
 
 
 
   wsprintf(szMessage, TEXT("Version: %d\nFormat: %s\nTotal Pages: %d"), AnnFileInfo.nVersion, szFormat, AnnFileInfo.nTotalPages); 
   MessageBox(NULL, szMessage, TEXT("Information"), MB_OK); 
 
   // Now, delete the second page 
 
   nRet = AnnContainer.DeletePageMemory(hMem, &uMemSize, 2); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   // Again, get information about the file in memory 
 
   AnnFileInfo.uStructSize = sizeof(ANNFILEINFO); 
 
   AnnFileInfo.nOffset = 0; 
 
   pMem = (L_UCHAR *) GlobalLock(hMem); 
 
   nRet =(L_INT) AnnContainer.FileInfoMemory(pMem,(L_UINT) uMemSize, &AnnFileInfo, sizeof(AnnFileInfo)); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   GlobalUnlock(hMem); 
 
   wsprintf(szMessage, TEXT("Version: %d\nFormat: %s\nTotal Pages: %d"), AnnFileInfo.nVersion,  
            szFormat, AnnFileInfo.nTotalPages); 
   MessageBox(NULL, szMessage, TEXT("Information"), MB_OK); 
 
   GlobalFree(hMem); 
 
   return SUCCESS; 
}