L_DicomSendCGetRequest

#include "ltdic.h"

L_LTDIC_API L_INT L_DicomSendCGetRequest(hNet, nPresentationID, nMessageID, pszClass, nPriority, hDS)

HDICOMNET hNet;	/* a DICOM Network handle */
L_UCHAR nPresentationID;	/* presentation ID */
L_UINT16 nMessageID;	/* message ID */
L_TCHAR * pszClass;	/* class type */
L_UINT16 nPriority;	/* priority of the message */
HDICOMDS hDS;	/* data set to get */

Sends a C-GET-REQ message to a peer member of a connection. This function is available in the Medical Imaging Suite Toolkit.

Parameter	Description
hNet	A DICOM Network handle to the peer member of the connection.
nPresentationID	Presentation ID. The presentation ID provides information about both the class type of the data and the transfer syntax to use when transferring the data.
nMessageID	Message ID. Each message sent by a member of a connection should have a unique ID. Since a member of a connection may send several messages, this ID allows that member to identify when a specific request has been completed.
pszClass	Class affected by the request. This will be an SOP Class or an SOP MetaClass.
nPriority	The priority level of the message. The Service Class Provider may or may not support priority. Therefore, setting this parameter may or may not have any effect. Possible values are:
	Value	Meaning
	COMMAND_PRIORITY_LOW	[0x0002] Low priority message.
	COMMAND_PRIORITY_MEDIUM	[0x0000] Medium priority message.
	COMMAND_PRIORTY_HIGH	[0x0001] High priority message.
hDS	Pointer to the data set to be found.

Returns

0	SUCCESS
>0	An error occurred. Refer to Return Codes.

Comments

Calling this function generates a call to RECEIVECGETREQUESTCALLBACK on the SCP. The SCP should respond by calling L_DicomSendCGetResponse which will generate a call to RECEIVECGETRESPONSECALLBACK.

You must create a data set and insert elements corresponding to the data you wish to get. The data set returned will include the entire data set that includes the requested data.

Required DLLs and Libraries

LTDIC

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

See Also

Functions:	L_DicomSendCGetResponse, RECEIVECGETREQUESTCALLBACK, RECEIVECGETRESPONSECALLBACK
Topics:	Working with DICOM Network Connections

Example

L_INT DicomSendCGetRequestExample(HDICOMNET hNet, L_TCHAR gszGetFile[L_MAXPATH])
{
   L_TCHAR szMsg[200];
   L_TCHAR szClassUID[800];
   HDICOMDS hDS=NULL;
   pDICOMTAG pTag=NULL;
   pDICOMELEMENT pElement=NULL;
   HDICOMPDU hPDU;
   L_UCHAR   nID;
   L_INT nRet;
   
   if (gszGetFile == NULL)
      return ERROR_INV_PARAMETER;

   /* send a get request to the server */
   
   /* gszGetFile will be used when this AE receives the NetReceiveCStoreRequest */
   /* associated with this CGetRequest to save the data set                     */
   lstrcpy(gszGetFile, TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\Get_request.dcm"));

   /* this sample uses fixed values */
   lstrcpy(szClassUID, UID_SC_IMAGE_STORAGE);
   
   /* create the data set that encodes the identifier to be matched */
   hDS = L_DicomCreateDS(NULL);
   L_DicomInitDS(hDS, CLASS_UNKNOWN, 0);
   L_DicomResetDS(hDS);

   /* add the required elements */
   pTag = L_DicomFindTag(TAG_QUERY_RETRIEVE_LEVEL);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }

   L_DicomSetStringValue(hDS, pElement, TEXT("PATIENT"), 1,  DICOM_CHARACTER_SET_DEFAULT);
   
   pTag = L_DicomFindTag(TAG_PATIENT_NAME);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }

   L_DicomSetStringValue(hDS, pElement, TEXT("*"), 1, DICOM_CHARACTER_SET_DEFAULT);

   /* add the optional fields that we want returned */
   pTag = L_DicomFindTag(TAG_PATIENT_ID);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }

   pTag = L_DicomFindTag(TAG_PATIENT_BIRTH_DATE);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }
   
   pTag = L_DicomFindTag(TAG_PATIENT_SEX);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }

   pTag = L_DicomFindTag(TAG_NUMBER_OF_PATIENT_RELATED_INSTANCES);
   pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_QUERY_RETRIEVE_LEVEL, pTag->nVR, FALSE, 0);
   if (pElement == NULL)
   {
      L_DicomFreeDS(hDS);
      return DICOM_ERROR_MEMORY;
   }

   hPDU = L_DicomGetAssociate(hNet);
   
   /* now, send a request */
   nID = L_DicomFindAbstract(hPDU, szClassUID);
   if(nID == 0)
   {
      wsprintf(szMsg, TEXT("Abstract Syntax %s Not Supported by Association!"), szClassUID);
      MessageBox(NULL, szMsg, TEXT("Error"), MB_OK);
   }
   else
   {
      nRet = L_DicomSendCGetRequest(hNet, nID, 1, szClassUID, COMMAND_PRIORITY_MEDIUM, hDS);
      if (nRet != DICOM_SUCCESS)
      {
         L_DicomFreeDS(hDS);
         return nRet;
      }
   }

   L_DicomFreeDS(hDS);
   
   /* we now must wait for the response and for the C-STORE sub-operations */
   return DICOM_SUCCESS;
}