{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from ctypes import *"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# Load the io_netcdf library\n",
    "\n",
    "#dll_path = r'..\\io_netcdf\\dll\\x64\\Release\\io_netcdf.dll'\n",
    "dll_path = r'..\\io_netcdf\\dll\\x64\\Debug\\io_netcdf.dll'\n",
    "libionc = CDLL(dll_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Prepare some C-compatible variables\n",
    "p = create_string_buffer(255)\n",
    "ival = c_int()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "('ierr = ', 0)\n",
      "('IONC_EBADID', c_long(-2001))\n"
     ]
    }
   ],
   "source": [
    "# Test 1: get constant value for a top-level io_netcdf constant\n",
    "p.value = b\"IONC_EBADID\"\n",
    "ierr = libionc.ionc_get_constant(p, byref(ival))\n",
    "print(\"ierr = \", ierr)\n",
    "print(p.value, ival)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "('ierr = ', 0)\n",
      "('UG_INVALID_DATALOCATION', c_long(-1013))\n"
     ]
    }
   ],
   "source": [
    "# Test 2: get constant value for an underlying io_ugrid constant\n",
    "p.value = b\"UG_INVALID_DATALOCATION\"\n",
    "ierr = libionc.ionc_get_constant(p, byref(ival))\n",
    "print(\"ierr = \", ierr)\n",
    "print(p.value, ival)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(c_long(-1013), 'Invalid topological data location')\n"
     ]
    }
   ],
   "source": [
    "# Test 3: request an error string for the error code from above.\n",
    "# NOTE: pass the integer error code by reference!\n",
    "# Returned string comes as a pointer to a character (array)\n",
    "libionc.ionc_strerror.restype = c_char_p\n",
    "print(ival, libionc.ionc_strerror(byref(ival)))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Close the io_netcdf library to release the file lock on the DLL.\n",
    "kernel32 = WinDLL('kernel32')    \n",
    "kernel32.FreeLibrary.argtypes = [wintypes.HMODULE]\n",
    "\n",
    "handle = libionc._handle # obtain the DLL handle\n",
    "kernel32.FreeLibrary(handle)"
   ]
  }
 ],
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    "name": "ipython",
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   "file_extension": ".py",
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