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Sends a C-FIND-REQ message to a peer member of a connection. This function is available in the PACS Imaging Toolkit.
#include "ltdic.h"
L_LTDIC_API L_INT L_DicomSendCFindRequest(hNet, nPresentationID, nMessageID, pszClass, nPriority, hDS)
A DICOM Network handle to the peer member of the connection.
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.
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.
Class affected by the request. This will be an SOP Class or an SOP MetaClass.
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. |
Pointer to the data set to be found.
| Value | Meaning |
|---|---|
| DICOM_SUCCESS | The function was successful. |
| >0 | An error occurred. Refer to Return Codes. |
Calling this function generates a call to RECEIVECFINDREQUESTCALLBACK on the SCP. The SCP should respond by calling L_DicomSendCFindResponse which will generate a call to RECEIVECFINDRESPONSECALLBACK.
You must create a data set and insert elements corresponding to the data you wish to find. A pointer to this data set is then passed as a parameter to this function.
Win32, x64, Linux.
#include <windowsx.h>#define FIND_TYPE_STUDY 1#define FIND_TYPE_SERIES 2#define FIND_TYPE_IMAGE 3L_INT DicomSendCFindRequestExample(HWND hStudyList,HDICOMNET hNet,L_INT* gnFindType,L_INT* gnFindCount){HDICOMPDU hPDU;L_UCHAR nID;HDICOMDS hDS=NULL;L_TCHAR szUID[200];L_TCHAR szMsg[200];long x;long lCount;L_TCHAR szFile[L_MAXPATH];HANDLE hFile=NULL;pDICOMTAG pTag=NULL;pDICOMELEMENT pElement=NULL;L_INT nRet;/* this example sends a command that will find all STUDIES on a called AE thatsupports the Study Root Query/Retrieve Information Model - FIND SOP ClassThe results are stored in a ListBox named StudyList as each resultis received in the NetReceiveCStoreRequest event *//* delete all previous find results */lCount = ListBox_GetCount(hStudyList);for(x=0; x<lCount; x++){ListBox_GetText(hStudyList, x, szFile);hFile = CreateFile(szFile, GENERIC_READ, 0, NULL,OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE,NULL);if(hFile)CloseHandle(hFile);}ListBox_ResetContent(hStudyList);*gnFindType = FIND_TYPE_STUDY; /* global variable used to distingish this find *//* send a Find request to the server */hPDU = L_DicomGetAssociate(hNet);lstrcpy(szUID, UID_STUDY_ROOT_QUERY_FIND);nID = L_DicomFindAbstract(hPDU, szUID);if(nID == 0){wsprintf(szMsg, TEXT("Abstract Syntax %s Not Supported by Association!"), szUID);MessageBox(NULL, szMsg, TEXT("Error"), MB_OK);}else{/* create a find attribute data set */hDS = L_DicomCreateDS(NULL);L_DicomInitDS(hDS, CLASS_UNKNOWN, 0);L_DicomResetDS(hDS);/* add the required fields for this seach */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;}/* we are searching at the study level */L_DicomSetStringValue(hDS, pElement, TEXT("STUDY "), 1, DICOM_CHARACTER_SET_DEFAULT);pTag = L_DicomFindTag(TAG_STUDY_DATE);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_STUDY_DATE, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_STUDY_TIME);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_STUDY_TIME, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_ACCESSION_NUMBER);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_ACCESSION_NUMBER, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_PATIENT_NAME);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_PATIENT_NAME, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_PATIENT_ID);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_PATIENT_ID, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_STUDY_ID);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_STUDY_ID, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_STUDY_INSTANCE_UID);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_STUDY_INSTANCE_UID, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}/* optional tags */pTag = L_DicomFindTag(TAG_STUDY_DESCRIPTION);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_STUDY_DESCRIPTION, 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_PATIENT_BIRTH_DATE, 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_PATIENT_SEX, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}pTag = L_DicomFindTag(TAG_OTHER_PATIENT_IDS);pElement = L_DicomInsertElement(hDS, NULL, FALSE, TAG_OTHER_PATIENT_IDS, pTag->nVR, FALSE, 0);if (pElement == NULL){L_DicomFreeDS(hDS);return DICOM_ERROR_MEMORY;}/* now, send the command set and data set */*gnFindCount = 0; /* global variable to cound results */nRet = L_DicomSendCFindRequest(hNet, nID, 1, szUID, COMMAND_PRIORITY_MEDIUM, hDS);if (nRet != DICOM_SUCCESS){L_DicomFreeDS(hDS);return nRet;}L_DicomFreeDS(hDS);}return DICOM_SUCCESS;}