* For useage examples, please see the rrd_binding_test project.
****************************************************************************/
using System;
+using System.Collections.Generic;
using System.Runtime.InteropServices;
/// <summary>
public class rrd
{
// Set this path to the location of your "rrdlib.dll" file
- const string dll = @"rrdlib.dll";
+ const string dll = @"C:\Programming\RRDTool\SVN\win32\DebugDLL\rrdlib.dll";
// IMPORTS - Main methods
[DllImport(dll)] static extern Int32 rrd_create(Int32 argc, string[] argv);
ref Int32 xsize, ref Int32 ysize, /* TODO - FILE, */ ref double ymin, ref double ymax);
[DllImport(dll)] static extern Int32 rrd_graph_v(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_fetch(Int32 argc, string[] argv, ref Int32 start,
- ref Int32 end, ref UInt32 step, ref UInt32 ds_cnt, ref string[] ds_namv, ref IntPtr data);
+ ref Int32 end, ref UInt32 step, [Out] out UInt32 ds_cnt, [Out] out IntPtr ds_namv, [Out] out IntPtr data);
[DllImport(dll)] static extern Int32 rrd_first(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_first_r(string filename, Int32 rraindex);
[DllImport(dll)] static extern Int32 rrd_last(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_last_r(string filename, Int32 rraindex);
[DllImport(dll)] static extern Int32 rrd_lastupdate(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_lastupdate_r(string filename, ref Int32 ret_last_update,
- ref UInt32 ret_ds_count, ref string[] ret_ds_names, ref string[] ret_last_ds);
+ ref UInt32 ret_ds_count, [Out] out IntPtr ret_ds_names, [Out] out IntPtr ret_last_ds);
[DllImport(dll)] static extern Int32 rrd_dump(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_dump_r(string filename, string outname);
[DllImport(dll)] static extern Int32 rrd_xport(Int32 argc, string[] argv, Int32 unused,
ref Int32 start, ref Int32 end, ref UInt32 step, ref UInt32 col_cnt,
- ref string[] leggend_v, ref IntPtr data);
+ [Out] out IntPtr leggend_v, [Out] out IntPtr data);
[DllImport(dll)] static extern Int32 rrd_restore(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_resize(Int32 argc, string[] argv);
[DllImport(dll)] static extern Int32 rrd_tune(Int32 argc, string[] argv);
// IMPORTS - Utility methods
[DllImport(dll)] static extern string rrd_strversion();
[DllImport(dll)] static extern Int32 rrd_random();
- [DllImport(dll)] static extern string rrd_get_error();
+ [DllImport(dll)] static extern IntPtr rrd_get_error();
// MAIN FUNCTIONS
public static Int32 Fetch(string[] argv, ref Int32 start, ref Int32 end, ref UInt32 step,
ref UInt32 ds_cnt, ref string[] ds_namv, ref IntPtr data)
{
- return rrd_fetch(argv.GetUpperBound(0) + 1, argv, ref start, ref end, ref step, ref ds_cnt,
- ref ds_namv, ref data);
+ IntPtr ptr = new IntPtr();
+ Int32 rv = rrd_fetch(argv.GetUpperBound(0) + 1, argv, ref start, ref end, ref step, out ds_cnt,
+ out ptr, out data);
+ ds_namv = GetStringArray(ptr, ds_cnt);
+ return rv;
}
/// <summary>
public static Int32 Last_Update(string filename, ref Int32 ret_last_update, ref UInt32 ret_ds_count,
ref string[] ret_ds_names, ref string[] ret_last_ds)
{
- return rrd_lastupdate_r(filename, ref ret_last_update, ref ret_ds_count, ref ret_ds_names,
- ref ret_last_ds);
+ IntPtr ds_names = new IntPtr();
+ IntPtr last_ds = new IntPtr();
+ Int32 rt = rrd_lastupdate_r(filename, ref ret_last_update, ref ret_ds_count, out ds_names,out last_ds);
+ ret_ds_names = GetStringArray(ds_names, ret_ds_count);
+ ret_last_ds = GetStringArray(last_ds, 1);
+ return rt;
}
/// <summary>
/// <param name="data">Values from the rrd as double type</param>
/// <returns>0 if successful, -1 if an error occurred</returns>
public static Int32 Xport(string[] argv, ref Int32 start, ref Int32 end, ref UInt32 step,
- ref UInt32 col_cnt, ref string[] leggend_v, ref IntPtr data)
+ ref UInt32 col_cnt, ref string[] legend_v, ref IntPtr data)
{
- return rrd_xport(argv.GetUpperBound(0) + 1, argv, 0, ref start, ref end, ref step, ref col_cnt,
- ref leggend_v, ref data);
+ IntPtr legend = new IntPtr();
+ Int32 rt = rrd_xport(argv.GetUpperBound(0) + 1, argv, 0, ref start, ref end, ref step, ref col_cnt,
+ out legend, out data);
+ legend_v = GetStringArray(legend, col_cnt);
+ return rt;
}
/// <summary>
/// <returns>A string with the error message, or an emtpy string if no error occurred</returns>
public static string Get_Error()
{
- return rrd_get_error();
+ IntPtr ptr = rrd_get_error();
+ if (ptr == IntPtr.Zero)
+ return "";
+ return Marshal.PtrToStringAnsi(ptr);
}
/// <summary>
Marshal.StructureToPtr(info, newptr, true);
rrd_info_print(newptr);
}
+
+ /// <summary>
+ /// Converts a Char ** array of characters from the RRDLib returned as an IntPtr and converts
+ /// it to a String array given the number of items in the ptr array.
+ /// Re: http://stackoverflow.com/questions/1498931/marshalling-array-of-strings-to-char-in-c-must-be-quite-easy-if-you-know-ho
+ /// </summary>
+ /// <param name="ptr">Pointer to a character array returned from the RRDLib</param>
+ /// <param name="size">Number of items in the character array (not the number of characters)</param>
+ /// <returns>A string array</returns>
+ private static string[] GetStringArray(IntPtr ptr, UInt32 size)
+ {
+ var list = new List<string>();
+ for (int i = 0; i < size; i++)
+ {
+ var strPtr = (IntPtr)Marshal.PtrToStructure(ptr, typeof(IntPtr));
+ list.Add(Marshal.PtrToStringAnsi(strPtr));
+ ptr = new IntPtr(ptr.ToInt64() + IntPtr.Size);
+ }
+ return list.ToArray();
+ }
}
}
projects / rrdtool.git / blobdiff