LDicomNet::SendCGetRequest

Summary

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

Syntax

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

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:

LDicomDS *pDS

Pointer to the data set to be found.

Returns

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

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; 
   }