LDicomNet::SendCGetRequest

#include "ltdic.h"

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

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

Parameters

L_UCHAR 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.

L_UINT16 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.

L_TCHAR * pszClass

Class affected by the request. This will be an SOP Class or an SOP MetaClass.

L_UINT16 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.

LDicomDS *pDS

Pointer to the data set to be found.

Returns

Value Meaning
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

Platforms

Win32, x64

See Also

Functions

Topics

Example

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) identifies 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

    L_INT LDicomNet__SendCGetRequestExample(LMyDicomNet *m_pDicomNet ) 
    { 
       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; 
    } 

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