LDicomDS::LoadDSMemory

#include "Ltdic.h"

L_UINT16 EXT_FUNCTION LDicomDS::LoadDSMemory(pBuffer, uBufferSize, nFlags)

Loads a DICOM Data Set from memory.

Returns

Comments

Unless you pass the DS_LOAD_CLOSE flag, this function DOES NOT make a copy of the memory pointed to by pBuffer. Therefore, DO NOT free this memory as long as you are using the dataset referenced by this instance of the class, or until you have reset the dataset by calling LDicomDS::ResetDS.

Once you have called LDicomDS::ResetDS, you can repopulate the data set by calling LDicomDS::InitDS, LDicomDS::LoadDS, or LDicomDS::LoadDSMemory.

If you know certain characteristics of the DICOM file in memory, you can set those in nFlags. Any characteristic that you dont set will be automatically determined. For example, if you know that the metaheader is present, but you do not know the byte order, or whether the Value Representation is implicit or explicit, you can set only DS_METAHEADER_PRESENT in nFlags. During loading LEADTOOLS will determine the byte order and whether the byte order is implicit or explicit.

If you do not know any of the characteristics of the DICOM file in memory, set nFlags to 0 and LEADTOOLS will automatically determine all the file characteristics and load the file accordingly.

Required DLLs and Libraries

Platforms

Win32, x64

See Also

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LDicomDS_LoadDSMemoryExample()
{
   LDicomDS    Dataset;
   HANDLE      hFile; 
   L_UCHAR*    pBuffer = NULL;
   L_UINT32    uBufferSize = 0;
   L_BOOL      bResult;
   L_UINT32    NumberOfBytesRead;
   L_UINT16    uDICOMRet;
   L_UINT32    nClass;
   L_UINT16    nFlags;
   L_TCHAR     szUnknown[]=TEXT("Unknown Class");
   L_TCHAR*    pClassName;
   pDICOMIOD   pIOD;
   //Create a handle to the DICOM file on disk
   hFile = CreateFile( MAKE_IMAGE_PATH(TEXT("IMAGE2.dcm")),
                       GENERIC_READ,
                       FILE_SHARE_READ,
                       NULL,
                       OPEN_EXISTING,
                       FILE_ATTRIBUTE_NORMAL,
                       NULL);
   if (hFile == INVALID_HANDLE_VALUE)
   {
      return -1;
   }
   //Get the file size
   uBufferSize = GetFileSize(hFile, NULL);
   if(uBufferSize == INVALID_FILE_SIZE)
   {
      CloseHandle(hFile); 
      return -1;
   }
   //Allocate a buffer that will hold the data in the file
   pBuffer = (L_UCHAR*) malloc(uBufferSize);
   if(pBuffer == NULL)
   {
      CloseHandle(hFile); 
      return -1;
   }
   //Read the file data into a buffer
   bResult = ReadFile(hFile, pBuffer, uBufferSize, (LPDWORD) (&NumberOfBytesRead), NULL); 
   if(bResult == FALSE)
   {
      free(pBuffer);
      CloseHandle(hFile); 
      return -1;
   }
   //Load DICOM file from memory
   uDICOMRet = Dataset.LoadDSMemory(pBuffer, uBufferSize, 0);
   if(uDICOMRet != DICOM_SUCCESS)
   {
      free(pBuffer);
      CloseHandle(hFile);
      return -1;
   }
   //Get the information about the DICOM file.
   Dataset.GetInfoDS(&nClass, &nFlags);
   pIOD = LDicomIOD::FindClass(nClass);
   if (pIOD != NULL)
   {
      pClassName = pIOD->pszName;
   }
   else
   {
      pClassName = szUnknown;
   }
   MessageBox(NULL, pClassName, TEXT("Notice"), MB_OK);
   //Make sure to cleanup
   free(pBuffer);
   CloseHandle(hFile);
   return DICOM_SUCCESS;
}