LDicomNet::SendCGetRequest

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#include "ltdic.h"

L_INT LDicomNet::SendCGetRequest(nPresentationID, nMessageID, pszClass, nPriority, pDS)

L_UCHAR nPresentationID;	/* presentation ID */
L_UINT16 nMessageID;	/* message ID */
L_TCHAR * pszClass;	/* class type */
L_UINT16 nPriority;	/* priority of the message */
LDicomDS *pDS;	/* data set to get */

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

Parameter	Description
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_PRIORITY_HIGH	[0x0001] High priority message.
pDS	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 LDicomNet::OnReceiveCGetRequest on the SCP. The SCP should respond by calling LDicomNet::SendCGetResponse which will generate a call to LDicomNet::OnReceiveCGetResponse.

You must create a data set and insert elements corresponding to the data you wish to find. 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:	LDicomNet::SendCGetResponse, LDicomNet::OnReceiveCGetRequest, LDicomNet::OnReceiveCGetResponse
Topics:	Working with DICOM Network Connections

Example

L_INT LDicomNet__SendCGetRequestExample(LMyDicomNet *m_pDicomNet )
{
   //This example sends an C-Get Request to a server
   //In this example:
   //
   //1. LMyDicomNet is a class derived from LDicomNet; 
   //2. LMyDicomNet has the following member variables:
   //       m_nClientOrServer:  can be (STATUS_NONE, STATUS_SERVER, STATUS_CLIENT)
   //                           identifieds the LMyDicomNet object as a server or a client
   //       m_nDataCommand:     can be (COMMAND_C_MOVE,COMMAND_C_GET) 
   //                           set so the server knows how a C-Store Response was generated
   //
   //3. m_pDicomNet points to a valid LMyDicomNet object
   //      LMyDicomNet *m_pDicomNet
   // 
   //4. A connection exists between client and server
   //5. An association exists between the client and server
   CString strMsg = TEXT("C-Get\n");
   L_INT nRet;
   
   //Choose a class
   CString strClassUID = UID_SC_IMAGE_STORAGE;
   //create the data set that encodes the identifier to be matched
   LDicomDS DicomDS;
   DicomDS.InitDS(CLASS_UNKNOWN, 0);
   
   //Add the required elements
   //   TAG_QUERY_RETRIEVE_LEVEL
   //   TAG_PATIENT_NAME
   pDICOMTAG pDicomTag = LDicomTag::Find(TAG_QUERY_RETRIEVE_LEVEL);
   pDICOMELEMENT pElement = DicomDS.InsertElement( 
      NULL,                      //pDICOMELEMENT pNeighbor
      FALSE,                     //L_BOOL bChild
      TAG_QUERY_RETRIEVE_LEVEL,  //L_UINT32 nTag
      pDicomTag->nVR,            //L_UINT16 nVR
      FALSE,                     //L_BOOL bSequence,
      0                          //L_UINT32 nIndex
      );
   DicomDS.SetStringValue(pElement, TEXT("PATIENT"),1, DICOM_CHARACTER_SET_DEFAULT);
   
   pDicomTag = LDicomTag::Find(TAG_PATIENT_NAME);
   DicomDS.InsertElement( 
      pElement,                  //pDICOMELEMENT pNeighbor
      FALSE,                     //L_BOOL bChild
      TAG_PATIENT_NAME,          //L_UINT32 nTag
      pDicomTag->nVR,             //L_UINT16 nVR
      FALSE,                     //L_BOOL bSequence,
      0                          //L_UINT32 nIndex
      );
   DicomDS.SetStringValue(pElement, TEXT("*"),1, DICOM_CHARACTER_SET_DEFAULT); //get all patients
   //Add the optional fields that we want returned
   //   TAG_PATIENT_ID
   //   TAG_PATIENT_BIRTH_DATE
   //   TAG_PATIENT_SEX
   //   TAG_NUMBER_OF_STUDY_RELATED_INSTANCES
   pDicomTag = LDicomTag::Find(TAG_PATIENT_ID);
   DicomDS.InsertElement( 
                        pElement,                  //pDICOMELEMENT pNeighbor
                        FALSE,                     //L_BOOL bChild
                        TAG_PATIENT_ID,            //L_UINT32 nTag
                        pDicomTag->nVR,             //L_UINT16 nVR
                        FALSE,                     //L_BOOL bSequence,
                        0                          //L_UINT32 nIndex
                        );
   
   pDicomTag = LDicomTag::Find(TAG_PATIENT_BIRTH_DATE);
   DicomDS.InsertElement( 
                        pElement,                  //pDICOMELEMENT pNeighbor
                        FALSE,                     //L_BOOL bChild
                        TAG_PATIENT_BIRTH_DATE,    //L_UINT32 nTag
                        pDicomTag->nVR,             //L_UINT16 nVR
                        FALSE,                     //L_BOOL bSequence,
                        0                          //L_UINT32 nIndex
                        );
   
   pDicomTag = LDicomTag::Find(TAG_PATIENT_SEX);
   DicomDS.InsertElement( 
                        pElement,                  //pDICOMELEMENT pNeighbor
                        FALSE,                     //L_BOOL bChild
                        TAG_PATIENT_SEX,           //L_UINT32 nTag
                        pDicomTag->nVR,            //L_UINT16 nVR
                        FALSE,                     //L_BOOL bSequence,
                        0                          //L_UINT32 nIndex
                        );
   
   pDicomTag = LDicomTag::Find( TAG_NUMBER_OF_STUDY_RELATED_INSTANCES);
   DicomDS.InsertElement( 
                        pElement,                  //pDICOMELEMENT pNeighbor
                        FALSE,                     //L_BOOL bChild
                        TAG_NUMBER_OF_STUDY_RELATED_INSTANCES, //L_UINT32 nTag
                        pDicomTag->nVR,             //L_UINT16 nVR
                        FALSE,                     //L_BOOL bSequence,
                        0                          //L_UINT32 nIndex
                        );
   
   
   //Get the associate object
   LDicomAssociate *pDicomAssociate = m_pDicomNet->GetAssociate();
   
    //Is class supported in the assocation?
   L_UCHAR nPresentationID = pDicomAssociate->FindAbstract((L_TCHAR *)(LPCTSTR)strClassUID);
   
   //nPresentationID must be odd--0 indicates failure
   if (nPresentationID==0)
   {
      CString strTmp;
      strTmp.Format(TEXT("Abstract Syntax[%s] Not Included in the Association"), strClassUID);
      strMsg = strMsg + strTmp;
   }
   else 
      //success
   {
      L_UINT16 uUniqueID = 99;
      m_pDicomNet->m_FileCount = 0;  //used for file name in OnReceiveCStoreRequest event
      
      nRet =m_pDicomNet->SendCGetRequest(
                                          nPresentationID, 
                                          uUniqueID, 
                                          (L_TCHAR *)(LPCTSTR)strClassUID,
                                          COMMAND_PRIORITY_MEDIUM,
                                          &DicomDS
                                        );
      if(nRet > 0)
         return nRet;
   }
   AfxMessageBox(strMsg);
   //now wait for one or more C-STORE sub-operations and finally the C-Get response
   
   return DICOM_SUCCESS;
}