http://www.elberon5.com/typo/ en-us 40 elberon5.com comments I needed to convert points from different Geographic, State Plane, Universal Transverse Mercator (UTM) and US National Grid systems. There isn't much out there but the military does have a nice program called <A href="http://crunch.tec.army.mil/software/corpscon/corpscon.html">CorpsCon </A>which you can use to do bulk transformations. You can also use the corpscon dll in your code if you know how to wrap it using DLLImport. I was able to successfully implement it. <br><br><p>You'll need this - <a href="http://crunch.tec.army.mil/software/corpscon/using_the_corpscon_dll.pdf">using_the_corpscon_dll.pdf</a> <br><br><p>You'll need to create a new class that incorporates all of this. Drop the corpscon.dll file into your bin folder. <br><br><p>In your class in order to link in the corpscon6.dll file you use System.Runtime.InteropServices and [DllImport] to do this. The dll is written in C so you'll have a tough time sorting out what datatypes to pass for your wrapper. The toughest will be the char* types. I used a System.Text.StringBuilder for it. I only needed this to grab the error message. You'll want to wrap everything specified in the algorithm function that the PDF tells you to use. Like i did in convertNJPoint. <br><br> <p>Feel free to reuse this code. No guarantees that it'll even do anything. Any suggestions are definitely welcome. I know DllImport is dangerous with how it handles memory and i'm probably letting the GC do too much for me. <p>Here's how i call it in my project <pre> GIS.CorpsCon cc = new GIS.CorpsCon(); double[] dblarr = cc.convertNJPoint(Double.Parse(txtN.Text), Double.Parse(txtE.Text)); txtLat.Text = dblarr[0].ToString(); txtLon.Text = '-' + dblarr[1].ToString(); </pre> <br> Here's the Class <pre> using System; using System.Text; using System.Runtime.InteropServices; using System.Collections.Generic; namespace GIS { public class CorpsCon { public int InUnits { get { return GetInUnits(); } set { SetInUnits(value); } } public CorpsCon() { } public static string getErrorMessage(int error_code) { StringBuilder msg = new StringBuilder(); msg.Length = 2000; //This is not right. Will error if returned values is more than 2000 characters. GetErrorMessage(error_code, msg); corpscon_clean_up(); return msg.ToString(); } public double[] convertNJPoint(double Northing, double Easting) { double[] dblResults = new double[3]; corpscon_default_config(); SetNadconPath("c:\\program files\\Corpscon6x\\Nadcon\\".ToCharArray()); SetVertconPath("c:\\program files\\Corpscon6x\\vertcon\\".ToCharArray()); SetGeoidPath("c:\\program files\\Corpscon6x\\Geoid\\".ToCharArray()); SetInSystem(2); SetInDatum(1983); SetInUnits(1); SetInZone(2900); SetOutSystem(1); SetOutDatum(1983); SetOutUnits(3); SetOutZone(18); corpscon_initialize_convert(); SetXIn(Easting); SetYIn(Northing); int result = corpscon_convert(); dblResults[0] = GetYOut(); dblResults[1] = GetXOut(); dblResults[2] = result; corpscon_clean_up(); return dblResults; } [DllImport("corpscon_v6.dll")] static extern int corpscon_default_config(); [DllImport("corpscon_v6.dll")] static extern int SetInSystem(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutSystem(int val); [DllImport("corpscon_v6.dll")] static extern int SetInDatum(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutDatum(int val); [DllImport("corpscon_v6.dll")] static extern int SetInUnits(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutUnits(int val); [DllImport("corpscon_v6.dll")] static extern int SetInZone(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutZone(int val); [DllImport("corpscon_v6.dll")] static extern int SetInVDatum(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutVDatum(int val); [DllImport("corpscon_v6.dll")] static extern int SetInVUnits(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutVUnits(int val); [DllImport("corpscon_v6.dll")] static extern int SetOutUSNGDigits(int val); [DllImport("corpscon_v6.dll")] static extern int SetNadconPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int SetInHPGNArea(char[] area); [DllImport("corpscon_v6.dll")] static extern int SetOutHPGNArea(char[] area); [DllImport("corpscon_v6.dll")] static extern int SetVertconPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int SetUseVertconCustomAreas(int opt); [DllImport("corpscon_v6.dll")] static extern int SetVertconCustomAreaListFile(char[] file); [DllImport("corpscon_v6.dll")] static extern int SetGeoidPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int SetGeoidCodeBase(int val); [DllImport("corpscon_v6.dll")] static extern int SetUseGeoidCustomAreas(int opt); [DllImport("corpscon_v6.dll")] static extern int SetGeoidCustomAreaListFile(char[] file); [DllImport("corpscon_v6.dll")] static extern int corpscon_initialize_convert(); [DllImport("corpscon_v6.dll")] static extern int SetXIn(double val); [DllImport("corpscon_v6.dll")] static extern int SetYIn(double val); [DllImport("corpscon_v6.dll")] static extern int SetZIn(double val); [DllImport("corpscon_v6.dll")] static extern int SetUSNGIn(char[] val); [DllImport("corpscon_v6.dll")] static extern int corpscon_convert(); [DllImport("corpscon_v6.dll", CharSet = CharSet.Ansi, SetLastError = true)] static extern int GetErrorMessage(int err_code, StringBuilder msg); [DllImport("corpscon_v6.dll")] static extern double GetXOut(); [DllImport("corpscon_v6.dll")] static extern double GetYOut(); [DllImport("corpscon_v6.dll")] static extern double GetZOut(); [DllImport("corpscon_v6.dll")] static extern int GetUSNGOut(char[] val); [DllImport("corpscon_v6.dll")] static extern int GetCorpsconValue(int code, double[] val); [DllImport("corpscon_v6.dll")] static extern int corpscon_clean_up(); [DllImport("corpscon_v6.dll")] static extern int GetInSystem(); [DllImport("corpscon_v6.dll")] static extern int GetOutSystem(); [DllImport("corpscon_v6.dll")] static extern int GetInDatum(); [DllImport("corpscon_v6.dll")] static extern int GetOutDatum(); [DllImport("corpscon_v6.dll")] static extern int GetInUnits(); [DllImport("corpscon_v6.dll")] static extern int GetOutUnits(); [DllImport("corpscon_v6.dll")] static extern int GetInZone(); [DllImport("corpscon_v6.dll")] static extern int GetOutZone(); [DllImport("corpscon_v6.dll")] static extern int GetInVDatum(); [DllImport("corpscon_v6.dll")] static extern int GetInVUnits(); [DllImport("corpscon_v6.dll")] static extern int GetOutVUnits(); [DllImport("corpscon_v6.dll")] static extern int GetOutUSNGDigits(); [DllImport("corpscon_v6.dll")] static extern int GetNadconPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int GetInHPGNArea(char[] area); [DllImport("corpscon_v6.dll")] static extern int GetOutHPGNArea(char[] area); [DllImport("corpscon_v6.dll")] static extern int GetVertconPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int GetVertconCustomAreaListFile(char[] filename); [DllImport("corpscon_v6.dll")] static extern int GetUseVertconCustomAreas(); [DllImport("corpscon_v6.dll")] static extern int GetGeoidCodeBase(); [DllImport("corpscon_v6.dll")] static extern int GetGeoidPath(char[] path); [DllImport("corpscon_v6.dll")] static extern int GetGeoidCustomAreaListFile(char[] filename); [DllImport("corpscon_v6.dll")] static extern int GetUseGeoidCustomAreas(); } } </pre> Wed, 30 Jan 2008 13:21:00 CST <a href="/typo/articles/2008/01/30/corpscon-6-c-dllimport">CorpsCon 6 - C# - DLLImport</a> <a href="/typo/articles/2008/01/30/corpscon-6-c-dllimport">CorpsCon 6 - C# - DLLImport</a>