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DcmSCU Class Reference

Base class for implementing DICOM Service Class User functionality. More...

Inheritance diagram for DcmSCU:
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Collaboration diagram for DcmSCU:
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Classes

struct  DcmSCUPresContext
 Defines presentation context, consisting of one abstract syntax name and a list of transfer syntaxes for this abstract syntax. More...
 

Public Member Functions

 DcmSCU ()
 Constructor, just initializes internal class members.
 
virtual ~DcmSCU ()
 Virtual destructor.
 
OFCondition addPresentationContext (const OFString &abstractSyntax, const OFList< OFString > &xferSyntaxes)
 Add presentation context to be used for association negotiation.
 
virtual OFCondition initNetwork ()
 Initialize network, i.e. prepare for association negotiation.
 
virtual OFCondition negotiateAssociation ()
 Negotiate association by using presentation contexts and parameters as defined by earlier function calls.
 
T_ASC_PresentationContextID findPresentationContextID (const OFString &abstractSyntax, const OFString &transferSyntax)
 After negotiation association, this call returns the first usable presentation context given the desired abstract syntax and transfer syntax.
 
virtual OFCondition sendECHORequest (const T_ASC_PresentationContextID presID)
 This function sends a C-ECHO command via network to another DICOM application.
 
virtual OFCondition sendSTORERequest (const T_ASC_PresentationContextID presID, const OFString &dicomFile, DcmDataset *dset, DcmDataset *&rspCommandSet, DcmDataset *&rspStatusDetail, Uint16 &rspStatusCode)
 This function sends a C-STORE request on the currently opened association and receives the corresponding response then.
 
virtual OFCondition sendFINDRequest (T_ASC_PresentationContextID presID, DcmDataset *queryKeys, FINDResponses *responses)
 Sends a C-FIND Request on given presentation context and receives list of responses.
 
virtual OFCondition handleFINDResponse (Uint16 presContextID, FINDResponse *response, OFBool &waitForNextResponse)
 This is the standard handler for C-FIND message responses: It just adds up all responses it receives and prints a DEBUG message.
 
virtual OFCondition sendCANCELRequest (Uint16 presContextID)
 Send C-FIND-CANCEL and, therefore, ends the C-FIND session, i.e. no further responses will be handled.
 
virtual OFCondition sendACTIONRequest (const T_ASC_PresentationContextID presID, const OFString &sopInstanceUID, const Uint16 actionTypeID, DcmDataset *reqDataset, Uint16 &rspStatusCode)
 This function sends a N-ACTION request on the currently opened association and receives the corresponding response then.
 
virtual OFCondition handleEVENTREPORTRequest (DcmDataset *&reqDataset, Uint16 &eventTypeID, const int timeout=0)
 Receives N-EVENT-REPORT request on the currently opened association and sends a corresponding response.
 
virtual void closeAssociation (const DcmCloseAssociationType closeType)
 Closes the association created by this SCU.
 
void setMaxReceivePDULength (const unsigned long maxRecPDU)
 Set maximum PDU length (to be received by SCU)
 
void setDIMSEBlockingMode (const T_DIMSE_BlockingMode blockingMode)
 Set whether to send in DIMSE blocking or non-blocking mode.
 
void setAETitle (const OFString &myAETtitle)
 Set SCU's AETitle to be used in association negotiation.
 
void setPeerHostName (const OFString &peerHostName)
 Set SCP's host (hostname or IP address) to talk to in association negotiation.
 
void setPeerAETitle (const OFString &peerAETitle)
 Set SCP's AETitle to talk to in association negotiation.
 
void setPeerPort (const Uint16 peerPort)
 Set SCP's port number to connect to for association negotiation.
 
void setDIMSETimeout (const Uint32 dimseTimeout)
 Set timeout for receiving DIMSE messages.
 
void setACSETimeout (const Uint32 acseTimeout)
 Set timeout for receiving ACSE messages.
 
void setAssocConfigFileAndProfile (const OFString &filename, const OFString &profile)
 Set an association configuration file and profile to be used.
 
void setVerbosePCMode (const OFBool mode)
 Set whether to show presentation contexts in verbose or debug mode.
 
OFBool isConnected () const
 Get current connection status.
 
Uint32 getMaxReceivePDULength () const
 Returns maximum PDU length configured to be received by SCU.
 
T_DIMSE_BlockingMode getDIMSEBlockingMode () const
 Returns whether DIMSE messaging is configured to be blocking or unblocking.
 
const OFStringgetAETitle () const
 Returns the SCU's own configured AETitle.
 
const OFStringgetPeerHostName () const
 Returns the SCP's (peer's) host name configured.
 
const OFStringgetPeerAETitle () const
 Returns the SCP's (peer's) AETitle configured.
 
Uint16 getPeerPort () const
 Returns the SCP's (peer's) TCP/IP port configured.
 
Uint32 getDIMSETimeout () const
 Returns the DIMSE timeout configured defining how long SCU will wait for DIMSE responses.
 
Uint32 getACSETimeout () const
 Returns the timeout configured defining how long SCU will wait for messages during ACSE messaging (association negotiation)
 
OFBool getVerbosePCMode () const
 Returns the verbose presentation context mode configured specifying whether details on the presentation contexts (negotiated during association setup) should be shown in verbose or debug mode.
 
OFBool getTLSEnabled () const
 Returns whether SCU is configured to create a TLS connection with the SCP.
 

Protected Member Functions

OFCondition sendDIMSEMessage (const T_ASC_PresentationContextID presID, T_DIMSE_Message *msg, DcmDataset *dataObject, DIMSE_ProgressCallback callback, void *callbackContext, DcmDataset **commandSet=NULL)
 Sends a DIMSE command and possibly also a dataset from a data object via network to another DICOM application.
 
OFCondition getDatasetInfo (DcmDataset *dataset, OFString &sopClassUID, OFString &sopInstanceUID, E_TransferSyntax &transferSyntax)
 Returns SOP Class UID, SOP Instance UID and original transfer syntax for a given dataset.
 
OFCondition useSecureConnection (DcmTransportLayer *tlayer)
 Tells DcmSCU to use a secure TLS connection described by the given TLS layer.
 
OFCondition receiveDIMSECommand (T_ASC_PresentationContextID *presID, T_DIMSE_Message *msg, DcmDataset **statusDetail, DcmDataset **commandSet=NULL, const Uint32 timeout=0)
 Receive DIMSE command (excluding dataset!) over the currently open association.
 
OFCondition receiveDIMSEDataset (T_ASC_PresentationContextID *presID, DcmDataset **dataObject, DIMSE_ProgressCallback callback, void *callbackContext)
 Receives one dataset (of instance data) via network from another DICOM application.
 
void findPresentationContext (const T_ASC_PresentationContextID presID, OFString &abstractSyntax, OFString &transferSyntax)
 After negotiation association, this call returns the presentation context belonging to the given presentation context ID.
 
virtual Uint16 checkEVENTREPORTRequest (T_DIMSE_N_EventReportRQ &request, DcmDataset *reqDataset)
 Check given N-EVENT-REPORT request and dataset for validity.
 

Private Member Functions

 DcmSCU (const DcmSCU &src)
 Private undefined copy-constructor.
 
DcmSCUoperator= (const DcmSCU &src)
 Private undefined operator=.
 
Uint16 nextMessageID ()
 Returns next available message ID free to be used by SCU.
 

Private Attributes

T_ASC_Associationm_assoc
 Associaton of this SCU. This class only handles 1 association at a time.
 
T_ASC_Networkm_net
 The DICOM network the association is based on.
 
T_ASC_Parametersm_params
 Association parameters.
 
OFString m_assocConfigFilename
 Configuration file for presentation contexts (optional)
 
OFString m_assocConfigProfile
 Profile in configuration file that should be used (optional)
 
OFList< DcmSCUPresContextm_presContexts
 List of presentation contexts that should be negotiated.
 
OFString m_assocConfigFile
 Configuration file containing association parameters.
 
T_DIMSE_Messagem_openDIMSERequest
 The last DIMSE successfully sent, unresponded DIMSE request.
 
Uint32 m_maxReceivePDULength
 Maximum PDU size.
 
T_DIMSE_BlockingMode m_blockMode
 DIMSE blocking mode.
 
OFString m_ourAETitle
 AEtitle of this application.
 
OFString m_peer
 Peer hostname.
 
OFString m_peerAETitle
 AEtitle of remote application.
 
Uint16 m_peerPort
 Port of remote application entity.
 
Uint32 m_dimseTimeout
 DIMSE timeout.
 
Uint32 m_acseTimeout
 ACSE timeout.
 
OFBool m_verbosePCMode
 Verbose PC mode.
 

Detailed Description

Base class for implementing DICOM Service Class User functionality.

The class offers support for negotiating associations and sending and receiving arbitrary DIMSE messages on that connection. DcmSCU has built-in C-ECHO support so derived classes do not have to implement that capability on their own.

Warning
This class is EXPERIMENTAL. Be careful to use it in production environment.

Definition at line 110 of file scu.h.

Constructor & Destructor Documentation

DcmSCU::DcmSCU ( const DcmSCU src)
private

Private undefined copy-constructor.

Shall never be called.

Parameters
srcSource object

Member Function Documentation

OFCondition DcmSCU::addPresentationContext ( const OFString abstractSyntax,
const OFList< OFString > &  xferSyntaxes 
)

Add presentation context to be used for association negotiation.

Parameters
abstractSyntax[in] Abstract syntax name in UID format
xferSyntaxes[in] List of transfer syntaxes to be added for the given abstract syntax
Returns
EC_Normal if adding was successful, otherwise error code
virtual Uint16 DcmSCU::checkEVENTREPORTRequest ( T_DIMSE_N_EventReportRQ request,
DcmDataset reqDataset 
)
protectedvirtual

Check given N-EVENT-REPORT request and dataset for validity.

This method is called by handleEVENTREPORTRequest() before sending the response in order to determine the DIMSE status code to be used for the response message.

Parameters
request[in] The N-EVENT-REPORT request message data structure
reqDataset[in] The N-EVENT-REPORT request dataset received. Might be NULL.
Returns
DIMSE status code to be used for the N-EVENT-REPORT response. Always returns STATUS_Success (0). Derived classes should, therefore, overwrite this method and return a more appropriate value based on the result of the checks performed.
virtual void DcmSCU::closeAssociation ( const DcmCloseAssociationType  closeType)
virtual

Closes the association created by this SCU.

Also resets the current association.

Parameters
closeType[in] Define whether to release or abort the association

Reimplemented in DcmTLSSCU.

void DcmSCU::findPresentationContext ( const T_ASC_PresentationContextID  presID,
OFString abstractSyntax,
OFString transferSyntax 
)
protected

After negotiation association, this call returns the presentation context belonging to the given presentation context ID.

Parameters
presID[in] The presentation context ID to look for
abstractSyntax[out] The abstract syntax (UID) for that ID. Empty, if such a presentation context does not exist.
transferSyntax[out] The transfer syntax (UID) for that ID. Empty, if such a presentation context does not exist.
T_ASC_PresentationContextID DcmSCU::findPresentationContextID ( const OFString abstractSyntax,
const OFString transferSyntax 
)

After negotiation association, this call returns the first usable presentation context given the desired abstract syntax and transfer syntax.

Parameters
abstractSyntax[in] The abstract syntax (UID) to look for
transferSyntax[in] The transfer syntax (UID) to look for. If empty, the transfer syntax is not checked.
Returns
Adequate Presentation context ID that can be used. 0 if none found.
Uint32 DcmSCU::getACSETimeout ( ) const

Returns the timeout configured defining how long SCU will wait for messages during ACSE messaging (association negotiation)

Returns
The ACSE timeout configured
const OFString& DcmSCU::getAETitle ( ) const

Returns the SCU's own configured AETitle.

Returns
The AETitle configured for this SCU
OFCondition DcmSCU::getDatasetInfo ( DcmDataset dataset,
OFString sopClassUID,
OFString sopInstanceUID,
E_TransferSyntax &  transferSyntax 
)
protected

Returns SOP Class UID, SOP Instance UID and original transfer syntax for a given dataset.

Parameters
dataset[in] The dataset to read from
sopClassUID[out] The value of attribute SOP Class UID if present
sopInstanceUID[out] The value of attribute SOP Instance UID if present
transferSyntax[out] The value of transfer syntax that originally was read from disk
Returns
Error if dataset is NULL, otherwise EC_Normal. All return parameters will be empty if not found (transferSyntax will be set to EXS_Unknown) in the file.
T_DIMSE_BlockingMode DcmSCU::getDIMSEBlockingMode ( ) const

Returns whether DIMSE messaging is configured to be blocking or unblocking.

Returns
The blocking mode configured
Uint32 DcmSCU::getDIMSETimeout ( ) const

Returns the DIMSE timeout configured defining how long SCU will wait for DIMSE responses.

Returns
The DIMSE timeout configured
Uint32 DcmSCU::getMaxReceivePDULength ( ) const

Returns maximum PDU length configured to be received by SCU.

Returns
Maximum PDU length in bytes
const OFString& DcmSCU::getPeerAETitle ( ) const

Returns the SCP's (peer's) AETitle configured.

Returns
The AETitle configured to be talked to
const OFString& DcmSCU::getPeerHostName ( ) const

Returns the SCP's (peer's) host name configured.

Returns
The hostname (or IP) configured to be talked to
Uint16 DcmSCU::getPeerPort ( ) const

Returns the SCP's (peer's) TCP/IP port configured.

Returns
The port configured to talked to
OFBool DcmSCU::getTLSEnabled ( ) const

Returns whether SCU is configured to create a TLS connection with the SCP.

Returns
OFFalse for this class but may be overriden by derived classes
OFBool DcmSCU::getVerbosePCMode ( ) const

Returns the verbose presentation context mode configured specifying whether details on the presentation contexts (negotiated during association setup) should be shown in verbose or debug mode.

The latter is the default.

Returns
The verbose presentation context mode configured
virtual OFCondition DcmSCU::handleEVENTREPORTRequest ( DcmDataset *&  reqDataset,
Uint16 &  eventTypeID,
const int  timeout = 0 
)
virtual

Receives N-EVENT-REPORT request on the currently opened association and sends a corresponding response.

Calls checkEVENTREPORTRequest() in order to determine the DIMSE status code to be used for the N-EVENT-REPORT response.

Parameters
reqDataset[out] Pointer to the dataset received
eventTypeID[out] Event Type ID from the command set received
timeout[in] Optional timeout in seconds for receiving data. This value (if not 0) overwrites the standard DIMSE timeout and also enables the non-blocking mode for receiving the request.
Returns
status, EC_Normal if successful, an error code otherwise
virtual OFCondition DcmSCU::handleFINDResponse ( Uint16  presContextID,
FINDResponse response,
OFBool &  waitForNextResponse 
)
virtual

This is the standard handler for C-FIND message responses: It just adds up all responses it receives and prints a DEBUG message.

Therefore, it is called by for each response received in sendFINDRequest(). The idea is of course to overwrite this function in a derived, actual SCU implementation if required. Thus, after each response, the caller of sendFINDRequest() can decide on its own whether he wants to cancel the C-FIND session, terminate the association, do something useful or whatever. That way this is a more object oriented kind of callback.

Parameters
TODO
Returns
TODO
virtual OFCondition DcmSCU::initNetwork ( )
virtual

Initialize network, i.e. prepare for association negotiation.

Returns
EC_Normal if initialization was successful, otherwise error code

Reimplemented in DcmTLSSCU.

OFBool DcmSCU::isConnected ( ) const

Get current connection status.

Returns
OFTrue if SCU is currently connected, OFFalse otherwise
virtual OFCondition DcmSCU::negotiateAssociation ( )
virtual

Negotiate association by using presentation contexts and parameters as defined by earlier function calls.

If negotiation fails, there is no need to close the association or to do anything else with this class.

Returns
EC_Normal if negotiation was successful, otherwise error code

Reimplemented in DcmTLSSCU.

Uint16 DcmSCU::nextMessageID ( )
private

Returns next available message ID free to be used by SCU.

Returns
Next free message ID
DcmSCU& DcmSCU::operator= ( const DcmSCU src)
private

Private undefined operator=.

Shall never be called.

Parameters
srcSource object
Returns
Reference to this
OFCondition DcmSCU::receiveDIMSECommand ( T_ASC_PresentationContextID *  presID,
T_DIMSE_Message msg,
DcmDataset **  statusDetail,
DcmDataset **  commandSet = NULL,
const Uint32  timeout = 0 
)
protected

Receive DIMSE command (excluding dataset!) over the currently open association.

Parameters
presID[out] Contains in the end the ID of the presentation context which was specified in the DIMSE command received
msg[out] The message received
statusDetail[out] If a non-NULL value is passed this variable will in the end contain detailed information with regard to the status information which is captured in the status element (0000,0900). Note that the value for element (0000,0900) is not contained in this return value but in internal msg. For details on the structure of this object, see DICOM standard part 7, annex C).
commandSet[out] If this parameter is not NULL, it will return a copy of the DIMSE command which was received from the other DICOM application. The caller is responsible to de-allocate the returned object!
timeout[in] If this parameter is not 0, it specifies the timeout (in seconds) to be used for receiving the DIMSE command. Otherwise, the default timeout value is used (see setDIMSETimeout()).
Returns
EC_Normal if command could be received successfully, an error code otherwise
OFCondition DcmSCU::receiveDIMSEDataset ( T_ASC_PresentationContextID *  presID,
DcmDataset **  dataObject,
DIMSE_ProgressCallback  callback,
void *  callbackContext 
)
protected

Receives one dataset (of instance data) via network from another DICOM application.

Parameters
presID[out] Contains in the end the ID of the presentation context which was used in the PDVs that were received on the network. If the PDVs show different presentation context IDs, this function will return an error.
dataObject[out] Contains in the end the information which was received over the network
callback[in] Pointer to a function which shall be called to indicate progress
callbackContext[in] Pointer to data which shall be passed to the progress indicating function
Returns
EC_Normal if dataset could be received successfully, an error code otherwise
virtual OFCondition DcmSCU::sendACTIONRequest ( const T_ASC_PresentationContextID  presID,
const OFString sopInstanceUID,
const Uint16  actionTypeID,
DcmDataset reqDataset,
Uint16 &  rspStatusCode 
)
virtual

This function sends a N-ACTION request on the currently opened association and receives the corresponding response then.

Parameters
presID[in] The ID of the presentation context to be used for sending the request message. Should not be 0.
sopInstanceUID[in] The requested SOP Instance UID
actionTypeID[in] The action type ID to be used
reqDataset[in] The dataset to be sent
rspStatusCode[out] The response status code received. 0 means success, others can be found in the DICOM standard.
Returns
EC_Normal if request could be issued and response was received successfully, an error code otherwise. That means that if the receiver sends a response denoting failure of the storage request, EC_Normal will be returned.
virtual OFCondition DcmSCU::sendCANCELRequest ( Uint16  presContextID)
virtual

Send C-FIND-CANCEL and, therefore, ends the C-FIND session, i.e. no further responses will be handled.

A call to this function only makes sense if an association is open, the given presentation context represents a valid C-FIND-enabled SOP class and usually only, if the last command send on that presentation context was a C-FIND message.

Parameters
TODO
Returns
TODO
OFCondition DcmSCU::sendDIMSEMessage ( const T_ASC_PresentationContextID  presID,
T_DIMSE_Message msg,
DcmDataset dataObject,
DIMSE_ProgressCallback  callback,
void *  callbackContext,
DcmDataset **  commandSet = NULL 
)
protected

Sends a DIMSE command and possibly also a dataset from a data object via network to another DICOM application.

Parameters
presID[in] Presentation context ID to be used for message
msg[in] Structure that represents a certain DIMSE command which shall be sent
dataObject[in] The instance data which shall be sent to the other DICOM application; NULL, if there is none
callback[in] Pointer to a function which shall be called to indicate progress
callbackContext[in] Pointer to data which shall be passed to the progress indicating function
commandSet[out] If this parameter is not NULL it will return a copy of the DIMSE command which is sent to the other DICOM application
Returns
Returns EC_Normal if sending request was successful, an error code otherwise
virtual OFCondition DcmSCU::sendECHORequest ( const T_ASC_PresentationContextID  presID)
virtual

This function sends a C-ECHO command via network to another DICOM application.

Parameters
presID[in] Presentation context ID to use. A value of 0 lets SCP class tries to choose one on its own.
Returns
EC_Normal if echo was successful, an error code otherwise
virtual OFCondition DcmSCU::sendFINDRequest ( T_ASC_PresentationContextID  presID,
DcmDataset queryKeys,
FINDResponses responses 
)
virtual

Sends a C-FIND Request on given presentation context and receives list of responses.

The function receives the first response and then calls the function handleFINDResponse which gets the relevant presentation context together with the response dataset and status information. Then it waits again for the next response, if there are more to come (i.e. response status is PENDING). In the end, after receiving all responses, the full list of responses is returned to the caller. If he is not interested, he just sets responses=NULL when calling the function. This function can be overwritten by actual SCU implementations but just should work fine for most people.

Parameters
TODO
Returns
TODO
virtual OFCondition DcmSCU::sendSTORERequest ( const T_ASC_PresentationContextID  presID,
const OFString dicomFile,
DcmDataset dset,
DcmDataset *&  rspCommandSet,
DcmDataset *&  rspStatusDetail,
Uint16 &  rspStatusCode 
)
virtual

This function sends a C-STORE request on the currently opened association and receives the corresponding response then.

Parameters
presID[in] Contains in the end the ID of the presentation context which was specified in the DIMSE command. If 0 is given, the function tries to find an approriate presentation context itself.
dicomFile[in] The filename of the DICOM file to be sent. Alternatively, a dataset can be given in the next parameter. If both are given the dataset from the file name is used.
dset[in] The dataset to be sent. Alternatively, a filename can be specified in the previous parameter. If both are given the dataset from the file name is used.
rspCommandSet[out] If this parameter is not NULL it will return a copy of the DIMSE command which was received from the other DICOM application.
rspStatusDetail[out] If a non-NULL value is passed this variable will in the end contain detailed information with regard to the status information which is captured in the status element (0000,0900). Note that the value for element (0000,0900) is not contained in this return value but in internal msg. For details on the structure of this object, see DICOM standard part 7, annex C).
rspStatusCode[out] The response status code received. 0 means success, others can be found in the DICOM standard.
Returns
EC_Normal if request could be issued and response was received successfully, error code otherwise. That means that if the receiver sends a response denoting failure of the storage request, EC_Normal will be returned.
void DcmSCU::setACSETimeout ( const Uint32  acseTimeout)

Set timeout for receiving ACSE messages.

Parameters
acseTimeout[in] ACSE Timeout in seconds used by timer for message timeouts during association negotiation
void DcmSCU::setAETitle ( const OFString myAETtitle)

Set SCU's AETitle to be used in association negotiation.

Parameters
myAETtitle[in] The SCU's AETitle to be used
void DcmSCU::setAssocConfigFileAndProfile ( const OFString filename,
const OFString profile 
)

Set an association configuration file and profile to be used.

Parameters
filename[in] File name of the association configuration file
profile[in] Profile inside the association negotiation file
void DcmSCU::setDIMSEBlockingMode ( const T_DIMSE_BlockingMode  blockingMode)

Set whether to send in DIMSE blocking or non-blocking mode.

Parameters
blockingMode[in] Either blocking or non-blocking mode
void DcmSCU::setDIMSETimeout ( const Uint32  dimseTimeout)

Set timeout for receiving DIMSE messages.

Parameters
dimseTimeout[in] DIMSE Timeout in seconds for receiving data. If the blocking mode is DIMSE_NONBLOCKING and we are trying to read data from the incoming socket stream and no data has been received.
void DcmSCU::setMaxReceivePDULength ( const unsigned long  maxRecPDU)

Set maximum PDU length (to be received by SCU)

Parameters
maxRecPDU[in] The maximum PDU size to use in bytes
void DcmSCU::setPeerAETitle ( const OFString peerAETitle)

Set SCP's AETitle to talk to in association negotiation.

Parameters
peerAETitle[in] The SCP's AETitle to be used
void DcmSCU::setPeerHostName ( const OFString peerHostName)

Set SCP's host (hostname or IP address) to talk to in association negotiation.

Parameters
peerHostName[in] The SCP's hostname or IP address to be used
void DcmSCU::setPeerPort ( const Uint16  peerPort)

Set SCP's port number to connect to for association negotiation.

Parameters
peerPort[in] The SCP's port number
void DcmSCU::setVerbosePCMode ( const OFBool  mode)

Set whether to show presentation contexts in verbose or debug mode.

Parameters
mode[in] Show presentation contexts in verbose mode if OFTrue. By default, the presentation contexts are shown in debug mode.
OFCondition DcmSCU::useSecureConnection ( DcmTransportLayer tlayer)
protected

Tells DcmSCU to use a secure TLS connection described by the given TLS layer.

Parameters
tlayer[in] The TLS transport layer including all TLS parameters
Returns
EC_Normal if given transport layer is ok, an error code otherwise

The documentation for this class was generated from the following file:


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