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# CAPLfunctionJ1939GetSpnFromDTC

# J1939GetSpnFromDTC

[Valid for](../../../Shared/FeatureAvailability.md):  CANoe DE • CANoe4SW DE

## Function Syntax

```
dword J1939GetSpnFromDTC(dword dtc)
```

## Description

Function extracts SPN from DTC.

## Parameters

* **dtc**: DTC from which an SPN is to be extracted.

## Return Values

Extracted SPN.

## Example

```plaintext theme={null}
on pg DM1
{
  int totalNumOfDTCs, curNumOfDTC;
  dword dtc;
  word fmi, oc;
  dword spn;

  // Iterate over all DTC blocks
  // and extract corresponding SPN, FMI and OC
  totalNumOfDTCs = (this.dlc - 2) / 4;
  for(curNumOfDTC = 0; curNumOfDTC < totalNumOfDTCs; curNumOfDTC++)
  {
    dtc = this.dword(2 + (curNumOfDTC * 4));
    spn = J1939GetSpnFromDTC(dtc);
    fmi = J1939GetFmiFromDTC(dtc);
    oc = J1939GetOcFromDTC(dtc);
    WriteEx(-3, 3, "DM1, DTC Nr. %d: SPN=%d, FMI=%d, OC=%d",
            curNumOfDTC+1, spn, fmi, oc);
  }
}
```