Does anybody have a snippet where they use PQgetCopyData? I must be calling it
wrong as it keep crashing my program. I've attached my code below. I am writing
this for a Code Interface Node in LabVIEW.
Thanks,
Dave
MgErr CINRun(LStrHandle conninfo, LStrHandle copystr, TD1Hdl resultValues) {
MgErr err = noErr;
PGconn *pConn;
PGresult* pResult = NULL;
char* szCopyStr = NULL;
char* errormsg = NULL;
char** buffer = NULL; // for retrieving the data
int nLen; // length of returned data
// connect to the database
char* szConnInfo = new char[LHStrLen(conninfo)+1];
LToCStr((*(conninfo)), (CStr)szConnInfo);
pConn = PQconnectdb(szConnInfo);
delete [] szConnInfo;
// check for errors connecting to database
if (PQstatus(pConn) != CONNECTION_OK)
{
DbgPrintf("Connection to database failed: %s",
PQerrorMessage(pConn));
}
else
{
// start the copy command
szCopyStr = new char[LHStrLen(copystr)+1];
LToCStr((*(copystr)), (CStr)szCopyStr);
pResult = PQexec(pConn, szCopyStr);
delete [] szCopyStr;
// get the data
int i = 0;
while (nLen = PQgetCopyData(pConn, buffer, false) > 0)
{
if (err = SetCINArraySize((UHandle)resultValues, 2, ++i))
goto out;
if (err = NumericArrayResize(uB, 1L,
(UHandle*)(&(*resultValues)->elt[i-1]), nLen-1))
goto out;
LStrLen(*(*resultValues)->elt[i-1]) = nLen-1;
// set the Labview String size
MoveBlock(*buffer, LStrBuf(*(*resultValues)->elt[i-1]),
nLen-1); // copy the data to a new string
PQfreemem(*buffer);
// free the memory from getCopy
}
(*resultValues)->dimSize = i;
out:
PQclear(pResult);
// see if there were errors
if (nLen == -2)
{
DbgPrintf("Copy Out failed: %s", PQerrorMessage(pConn));
}
}
// close the connection
PQfinish(pConn);
return err;
}
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