Problem in displaying/printing a predefined string as per packet in the tree.

Hello,

I am facing a problem in displaying the predefined string in the tree at a specific place. Below is the code using which I want to display the specific predefined string as per its packet info.

The code below corresponds to the failure messages which I want to print at a specific place:

    const value_string s1ap_CauseRadioNetwork_vals[] = {
  {   0, "unspecified" },
  {   1, "tx2relocoverall-expiry" },
  {   2, "successful-handover" },
  {   3, "release-due-to-eutran-generated-reason" },
  {   4, "handover-cancelled" },
  {   5, "partial-handover" },
  {   6, "ho-failure-in-target-EPC-eNB-or-target-system" },
  {   7, "ho-target-not-allowed" },
  {   8, "tS1relocoverall-expiry" },
  {   9, "tS1relocprep-expiry" },
  {  10, "cell-not-available" },
  {  11, "unknown-targetID" },
  {  12, "no-radio-resources-available-in-target-cell" },
  {  13, "unknown-mme-ue-s1ap-id" },
  {  14, "unknown-enb-ue-s1ap-id" },
  {  15, "unknown-pair-ue-s1ap-id" },
  {  16, "handover-desirable-for-radio-reason" },
  {  17, "time-critical-handover" },
  {  18, "resource-optimisation-handover" },
  {  19, "reduce-load-in-serving-cell" },
  {  20, "user-inactivity" },
  {  21, "radio-connection-with-ue-lost" },
  {  22, "load-balancing-tau-required" },
  {  23, "cs-fallback-triggered" },
  {  24, "ue-not-available-for-ps-service" },
  {  25, "radio-resources-not-available" },
  {  26, "failure-in-radio-interface-procedure" },
  {  27, "invalid-qos-combination" },
  {  28, "interrat-redirection" },
  {  29, "interaction-with-other-procedure" },
  {  30, "unknown-E-RAB-ID" },
  {  31, "multiple-E-RAB-ID-instances" },
  {  32, "encryption-and-or-integrity-protection-algorithms-not-supported" },
  {  33, "s1-intra-system-handover-triggered" },
  {  34, "s1-inter-system-handover-triggered" },
  {  35, "x2-handover-triggered" },
  {  36, "redirection-towards-1xRTT" },
  {  37, "not-supported-QCI-value" },
  {  38, "invalid-CSG-Id" },
  { 0, NULL }
};
static value_string_ext s1ap_CauseRadioNetwork_vals_ext = VALUE_STRING_EXT_INIT(s1ap_CauseRadioNetwork_vals);
static int
dissect_s1ap_CauseRadioNetwork(tvbuff_t *tvb U, int offset U, asn1_ctx_t *actx U, proto_tree *tree U, int hf_index U) {
offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
36, NULL, TRUE, 3, &CauseRadio);
return offset;
}

Below in proto_item_append_text() function, in its cause field I want to display it :

    static void
dissect_s1ap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item  *s1ap_item = NULL;
proto_tree  *s1ap_tree = NULL;

/* make entry in the Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "S1AP");

/* create the s1ap protocol tree */

s1ap_item = proto_tree_add_item(tree, proto_s1ap, tvb, 0, -1, ENC_NA);
s1ap_tree = proto_item_add_subtree(s1ap_item, ett_s1ap);
dissect_S1AP_PDU_PDU(tvb, pinfo, s1ap_tree, NULL);
proto_item_append_text(s1ap_item, ", Event-Message:%s ,Result:%s, Cause:%s ",val_to_str_ext(ProcedureCode, &s1ap_ProcedureCode_vals_ext,
"unknown message"),val_to_str(S1AP_PDU,s1ap_S1AP_PDU_vals, "unknown"),val_to_str(CauseRadio,s1ap_CauseRadioNetwork_vals, "unknown"));
}

Need help urgently,

Thanks in advance,

Regards,

Ankur