Loads the Data Set from the specified file.


#include "Ltdic.h"

L_LTDIC_API L_UINT16 L_DicomLoadDS(hDS, pszName, nFlags)



A DICOM handle.

L_TCHAR* pszName

Character string that contains the name of the file.

L_UINT16 nFlags

Meta-header flags, Transfer Syntax flags and other flags that indicate the file characteristics to use when loading the file. Possible values are:

Value Meaning
Meta-header flags:
0 [0x0000] LEADTOOLS will automatically determine the presence or absence of the Meta-header.
DS_METAHEADER_PRESENT [0x0001] The header is present.
DS_METAHEADER_ABSENT [0x0002] The header is absent.
Transfer Syntax flags:
0 [0x0000] LEADTOOLS will automatically determine the Transfer Syntax.
DS_LITTLE_ENDIAN [0x0004] Byte order is Little Endian.
DS_BIG_ENDIAN [0x0008] Byte order is Big Endian.
DS_IMPLICIT_VR [0x0010] The Value Representation is implicit.
DS_EXPLICIT_VR [0x0020] The Value Representation is explicit.
DS_LITTLE_ENDIAN | DS_IMPLICIT_VR Little Endian Byte Order/Implicit Value Representation
DS_LITTLE_ENDIAN | DS_EXPLICIT_VR Little Endian Byte Order/Explicit Value Representation
DS_BIG_ENDIAN | DS_EXPLICIT_VR Big Endian Byte Order/Explicit Value Representation
Other flags:
DS_LOAD_CLOSE [0x0200] The complete dataset will be loaded into memory and the file handle closed.

Any of the available Meta-header flags given above may be combined with any of the available values or combinations of values for the Transfer Syntax flags given above. For example, you may combine DS_METAHEADER_ABSENT with DS_EXPLICIT_VR, or you may combine DS_METAHEADER_PRESENT with DS_BIG_ENDIAN | DS_EXPLICIT_VR, etc.


Value Meaning
DICOM_SUCCESS The function was successful.
>0 An error occurred. Refer to Return Codes.


You must call L_DicomCreateDS to allocate memory for the Data Set, prior to calling this function.

If you know certain characteristics of the file, you can set those in nFlags. Any characteristic that you do not 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 file, set nFlags to 0 and LEADTOOLS will automatically determine all the file characteristics and load the file accordingly.

If DS_LOAD_CLOSE is used, for large images, this may slow performance, however, the file handle will be released. If set to None, large images will load quickly, and image traverse can begin immediately. However, until the file handle is released, nothing can be done to the image.

If DS_LOAD_CLOSE is not included in nFlags, the file will remain open until one of the following functions is called: L_DicomFreeDS, L_DicomResetDS, L_DicomInitDS, or L_DicomLoadDS (again).

To load a data set from memory, call L_DicomLoadDSMemory.

Required DLLs and Libraries


Win32, x64, Linux.

See Also




This example loads the Data Set from a file

L_INT DicomLoadDSExample(L_VOID) 
   L_INT nRet; 
   hDS = L_DicomCreateDS(NULL); 
   nRet = L_DicomLoadDS(hDS, MAKE_IMAGE_PATH(TEXT("Image1.dcm")), 0); 
   if (nRet != DICOM_SUCCESS) 
      return nRet; 
   return DICOM_SUCCESS; 

Help Version 22.0.2022.12.7
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.


Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.