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RECEIVECGETREQUESTCALLBACK

Summary

Notifies a connection that a C-GET-REQ command was received. This function is available in the Medical Imaging Suite Medical Imaging Suite.

Syntax

#include "ltdic.h"

L_VOID pEXT_CALLBACK Your Function(hNet, nPresentationID, nMessageID, pszClass, nPriority, hDS, pUserData)

Parameters

HDICOMNET hNet

A DICOM Network handle.

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.

HDICOMDS hDS

Pointer to the data set to be found.

L_VOID * pUserData

Void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function.

Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.

Returns

None.

Comments

A call to this function is generated on an SCP when L_DicomSendCGetRequest is called by the SCP.

To use this callback function, RECEIVECGETREQUESTCALLBACK must be set using L_DicomSetCallback.

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

Example

static HWND hList; /* handle to list box */ 
 
L_VOID EXT_CALLBACK OnReceiveCGetRequest(HDICOMNET hNet, L_UCHAR nPresentationID, L_UINT16 nMessageID, L_TCHAR *pszClass, L_UINT16 nPriority, HDICOMDS hDS, L_VOID *pUserData) 
{ 
   UNREFERENCED_PARAMETER(pUserData); 
   L_TCHAR szMsg[800]; 
   L_TCHAR szAE[200]; 
   L_TCHAR szFile[L_MAXPATH]; 
   L_INT nRet; 
   HDICOMDS hDSRet=NULL; 
   HDICOMPDU hPDU; 
   pDICOMELEMENT pElement=NULL; 
   L_TCHAR *pszInstance=NULL; 
 
   ListBox_AddString(hList, TEXT("Command Set - C-STORE-RESPONSE")); 
   wsprintf(szMsg, TEXT("     Presentation ID: %d"), nPresentationID); 
   ListBox_AddString(hList, szMsg); 
   wsprintf(szMsg, TEXT("     Message ID: %d"), nMessageID); 
   ListBox_AddString(hList, szMsg); 
   wsprintf(szMsg, TEXT("     Affected SOP Class: %s"), pszClass); 
   ListBox_AddString(hList, szMsg); 
   wsprintf(szMsg, TEXT("     Priority: %d"), nPriority); 
   ListBox_AddString(hList, szMsg); 
    
   /* perform the get */ 
   /* 
      here, the AE should check the data set, and perform 
      matching against the files stored on the AE to determine 
      what data set(s) should be sent back to the calling AE. 
      In our case, we just send back a predetermined file for 
      this demo! 
   */ 
    
   /* load the sample file */ 
   /* NOTE: this sample is looking for a particular filename TEST2.dcm */ 
   lstrcpy(szFile, MAKE_IMAGE_PATH(TEXT("IMAGE2.dcm"))); 
   hDSRet = L_DicomCreateDS(NULL); 
   nRet = L_DicomLoadDS(hDSRet, szFile, 0); 
   if (nRet != DICOM_SUCCESS) 
      MessageBox(NULL, TEXT("Error Inside Callback Function"), TEXT("OnReceiveCGetRequest"), MB_OK); 
    
   /* now, send a store command for the get sub-operation */ 
   hPDU = L_DicomGetAssociate(hNet); 
 
   L_DicomGetCalling(hPDU, szAE, 200); 
    
   pElement = L_DicomFindFirstElement(hDSRet, NULL, TAG_SOP_INSTANCE_UID, FALSE); 
   if(pElement) 
      pszInstance = L_DicomGetStringValue(hDSRet, pElement, 0, 1); 
    
   nRet = L_DicomSendCStoreRequest(hNet, nPresentationID, nMessageID + 1, pszClass, pszInstance, nPriority, szAE, nMessageID, hDSRet); 
   if (nRet != DICOM_SUCCESS) 
      MessageBox(NULL, TEXT("Error Inside Callback Function"), TEXT("OnReceiveCGetRequest"), MB_OK); 
 
   /* the above will cause a ReceiveCStoreResponse event on this machine */ 
   /* we will send a get response after we have received the CStoreResponse from the calling AE */ 
   L_DicomFreeDS(hDS); 
}

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