This example loads the PBVM and calls the f_ret and f_in functions in the custom class user object n_rs in the PBL pbrs.pbl. The PowerScript for the functions is shown after the C++ code:

#include "stdafx.h"
#include "windows.h"
#include "pbni.h"
#include "vector"
using std::vector;
 
void main(int argc, char* argv[])
{
   HINSTANCE hinst = LoadLibrary("pbvm125.dll");
 
   typedef PBXRESULT (*P_PB_GetVM)(IPB_VM** vm);
 
   P_PB_GetVM getvm = (P_PB_GetVM)GetProcAddress(hinst,
      "PB_GetVM");
   IPB_VM*   pbvm;
 
   getvm(&pbvm);
 
   IPB_Session* session = NULL;
   vector<LPCSTR> ll(1);
 
   ll[0] = "pbrs.pbl";
   
   pbvm->CreateSession("pbrs", &ll[0], 1, &session);
 
   pbgroup group = session->FindGroup("n_rs",
      pbgroup_userobject);
   if (group == NULL) return;
   
   pbclass cls = session->FindClass(group, "n_rs");
   if (cls == NULL) return;
      
   pbobject obj = session->NewObject(cls);
   if (obj == NULL) return;
 
   pbmethodID mid = session->GetMethodID(cls, "f_ret",
      PBRT_FUNCTION, "Cresultset.");
   PBCallInfo ci;
   session->InitCallInfo(cls, mid, &ci);
   session->InvokeObjectFunction(obj, mid, &ci);   
  

// Use the result set returned from f_ret to
   // create an IPB_ResultSetAccessor rsa
   pbobject rs = ci.returnValue->GetObject();
   IPB_ResultSetAccessor* rsa = 
      session->GetResultSetAccessor(rs);
 
   // Create a result set object from rsa
   pbobject rsobj = session->CreateResultSet(rsa);
   
 
   // Call the f_in method
   mid = session->GetMethodID(cls, "f_in",
      PBRT_FUNCTION, "IRCresultset.");
   PBCallInfo ci1;
   session->InitCallInfo(cls, mid, &ci1);
   // Set the result set object rsobj as the
   // argument for f_in
   ci1.pArgs->GetAt(0)->SetObject(rsobj);
   session->InvokeObjectFunction(obj, mid, &ci1);
 

   session->FreeCallInfo(&ci);
   session->FreeCallInfo(&ci1);
}

f_ret retrieves data from a database into a DataStore and generates a result set:

ResultSet rs
DataStore ds
 
Long sts
Integer li_ret
 
// Profile EAS Demo DB V125
SQLCA.DBMS = "ODBC"
SQLCA.AutoCommit = False
SQLCA.DBParm = &
   "ConnectString='DSN=EAS Demo DB V125;UID=dba;PWD=sql'"
connect using sqlca;
 
ds = Create DataStore
ds.DataObject = ""
ds.DataObject = "d_rs"
ds.SetTransObject(sqlca)
w_main.dw_1.SetTransObject(sqlca)
 
long ll_ret, rows, rows2
ll_ret = ds.Retrieve()
ll_ret = w_main.dw_1.Retrieve()
//ds.sharedata(w_main.dw_1)
rows = ds.RowCount()
rows2 = w_main.dw_1.RowCount()
messagebox("info from f_ret", " row count is " &
   + string(rows) + " or " + string(rows2))
sts = ds.GenerateResultSet(rs)
 
Return rs

f_in takes a result set, rs, as an argument and uses it to create a DataStore:

DataStore ds
Int cnt, li_ret
 
ds = Create DataStore
ds.CreateFrom(rs)
cnt = ds.RowCount()
messagebox("info from f_in", "row count is " + string(cnt))
Return cnt