LEADTOOLS DICOM Features > 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 |
|---|---|---|
| LDicomNet::StartUp | Initializes the DICOM DLL. This must be done before calling any DICOM operation functions, but only needs to be called once per application. | LDicomNet::StartUp |
| LDicomNet::LDicomNet | Creates a DICOM Network object. | LDicomNet::LDicomNet |
| The SCP listens for incoming connection requests. | LDicomNet::Listen | |
| LDicomNet::Connect |  The SCU calls this function to connect to an SCP. This generates a call to this function on the SCP |
LDicomNet::OnAccept |
| LDicomNet::OnConnect |  The SCP calls LDicomNet::CreateNet for each connection it accepts. This provides the SCP memory to store information about this specific connection. LDicomNet::Accept is called to accept the connection. This generates a call to this function on the SCU. |
LDicomNet::LDicomNet LDicomNet::Accept |
| DICOM Network Connection established | ||
| LDicomNet::SendAssociateRequest | The SCU calls this function to request a DICOM Associate connection. This generates calls to these functions on the SCP. |
LDicomNet::OnReceive LDicomNet::OnReceiveAssociateRequest |
| LDicomNet::OnReceive LDicomNet::OnReceiveAssociateAccept or LDicomNet::OnReceive LDicomNet::OnReceiveAssociateReject |
The SCP calls LDicomNet::SendAssociateAccept to accept the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAssociateAccept on the SCU. LDicomNet::SendAssociateReject is sent to reject the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAssociateReject on the SCU. |
LDicomNet::SendAssociateAccept or LDicomNet::SendAssociateReject |
| DICOM Associate Connection established | ||
| LDicomNet::SendCStoreRequest | The SCU calls this function to request the storage of data. This generates calls to these functions on the SCP. |
LDicomNet::OnReceive LDicomNet::OnReceiveData LDicomNet::OnReceiveCStoreRequest |
| LDicomNet::OnReceive LDicomNet::OnReceiveData LDicomNet::OnReceiveCStoreResponse |
The SCP calls this function to respond to the storage request. This generates calls to these functions on the SCU. |
LDicomNet::SendCStoreResponse |
| LDicomNet::SendReleaseRequest or LDicomNet::SendAbort |
The SCP calls LDicomNet::SendReleaseRequest to request a release from the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveReleaseRequest on the SCP. This is the preferred method of closing a connection. LDicomNet::SendAbort can also be sent to close a connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAbort on the SCP. |
LDicomNet::OnReceive LDicomNet::OnReceiveReleaseRequest or LDicomNet::OnReceive [LDicomNet::OnReceiveAbort](LDicomNet-OnReceiveAbort.md |
| LDicomNet::OnReceive LDicomNet::OnReceiveReleaseResponse |
The SCP calls this function to respond to the release request. This generates calls to the following functions on the SCU. |
LDicomNet::SendReleaseResponse |
| LDicomNet::Close | The SCU calls this function to close the DICOM Associate connection. This generates a call to this function on the SCP. |
LDicomNet::OnClose |
| LDicomNet::ShutDown | When the DICOM DLL is no longer needed, call this function to shut down the DLL and free all associated memory. This function should be called once for every call to LDicomNet::StartUp. | LDicomNet::ShutDown |
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