Features of LEADTOOLS DICOM > DICOM Communication > Service Class User (SCU) and Service Class Provider (SCP) > Diagram of an SCU-SCP Set-up
Diagram of an SCU-SCP Set-Up
The diagram given below shows a simple example of an SCU-SCP connection and a series of function calls used to transfer messages and data.
| SCU | Description | SCP |
|---|---|---|
| L_DicomCreateNet | Creates a DICOM Network handle. | L_DicomCreateNet |
| L_DicomStartUp | Initializes the DICOM Network handle. | L_DicomStartUp |
| L_DicomSetCallback | Sets the callbacks to be used. The SCP listens for incoming connection requests. |
L_DicomSetCallback L_DicomListen |
| L_DicomConnect |  The SCU calls this function to connect to an SCP. This generates a call to this callback function on the SCP |
ACCEPTCALLBACK |
| CONNECTCALLBACK |  The SCP calls L_DicomCreateNet and L_DicomSetCallback for each connection it accepts. This provided the SCP memory to store information about this specific connection. L_DicomAccept is called to accept the connection. This generates a call to this callback function on the SCU. DICOM Network Connection established |
L_DicomCreateNet L_DicomSetCallback L_DicomAccept |
| L_DicomSendAssociateRequest | The SCU calls this function to request a DICOM Associate connection. This generates calls to these callback functions on the SCP. |
RECEIVECALLBACK RECEIVEASSOCIATEREQUESTCALLBACK |
| RECEIVECALLBACK RECEIVEASSOCIATEACCEPTCALLBACK or RECEIVECALLBACK RECEIVEASSOCIATEREJECTCALLBACK |
The SCP calls L_DicomSendAssociateAccept to accept the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEACCEPTCALLBACK on the SCU. L_DicomSendAssociateReject is sent to reject the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEREJECTCALLBACK on the SCU. DICOM Associate Connection established |
L_DicomSendAssociateAccept or L_DicomSendAssociateReject |
| L_DicomSendCStoreRequest | The SCU calls this function to request the storage of data. This generates calls to these callback functions on the SCP. | RECEIVECALLBACK RECEIVEDATACALLBACK RECEIVECSTOREREQUESTCALLBACK |
| RECEIVECALLBACK RECEIVEDATACALLBACK RECEIVECSTORERESPONSECALLBACK |
The SCP calls this function to respond to the storage request. This generates calls to these callback functions on the SCU. |
L_DicomSendCStoreResponse |
| L_DicomSendReleaseRequest or L_DicomSendAbort |
The SCP calls L_DicomSendReleaseRequest to request a release from the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVERELEASEREQUESTCALLBACK on the SCP. This is the preferred method of closing a connection. L_DicomSendAbort can also be sent to close a connection. This generates calls to RECEIVECALLBACK and RECEIVEABORTCALLBACK on the SCP. |
RECEIVECALLBACK RECEIVERELEASEREQUESTCALLBACK or RECEIVECALLBACK RECEIVEABORTCALLBACK |
| RECEIVECALLBACK RECEIVERELEASERESPONSECALLBACK |
The SCP calls this function to respond to the release request. This generates calls to the following callback functions on the SCU. |
L_DicomSendReleaseResponse |
| L_DicomClose | The SCU calls this function to close the DICOM Associate connection. This generates a call to this callback function on the SCP. |
CLOSECALLBACK |
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