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Loads a DICOM Data Set from memory.
#include "Ltdic.h"
L_UINT16 EXT_FUNCTION LDicomDS::LoadDSMemory(pBuffer, uBufferSize, nFlags)
Pointer to the file in memory to be loaded.
Size of the file in memory (in bytes).
Meta-header flags, Transfer Syntax flags and other flags that indicate the file characteristics to use when loading the file. Possible values for the Meta-header flags are:
| Value | Meaning |
|---|---|
| 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. |
| Value | Meaning |
|---|---|
| 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_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 |
|---|---|
| 0 | SUCCESS |
| >0 | An error occurred. Refer to Return Codes. |
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 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 DICOM file in memory, set nFlags to 0 and LEADTOOLS will automatically determine all the file characteristics and load the file accordingly.
Win32, x64
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 diskhFile = 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 sizeuBufferSize = GetFileSize(hFile, NULL);if(uBufferSize == INVALID_FILE_SIZE){CloseHandle(hFile);return -1;}//Allocate a buffer that will hold the data in the filepBuffer = (L_UCHAR*) malloc(uBufferSize);if(pBuffer == NULL){CloseHandle(hFile);return -1;}//Read the file data into a bufferbResult = ReadFile(hFile, pBuffer, uBufferSize, (LPDWORD) (&NumberOfBytesRead), NULL);if(bResult == FALSE){free(pBuffer);CloseHandle(hFile);return -1;}//Load DICOM file from memoryuDICOMRet = 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 cleanupfree(pBuffer);CloseHandle(hFile);return DICOM_SUCCESS;}