Example C# Project

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Example C# Project

After you install MapForce, an example MapForce API client project for C# is available in the directory C:/Users/<username>/Documents/
Altova/MapForce2019/MapForceExamples/API.

 

You can compile and run the project with Visual Studio 2008 or later. To compile and run the example, open the solution .sln file in Visual Studio and run Debug | Start Debugging or Debug | Start Without Debugging.

 

Note:If you have a 64-bit operating system and are using a 32-bit installation of MapForce, add the x86 platform in the solution's Configuration Manager and build the sample using this configuration. A new x86 platform (for the active solution in Visual Studio) can be created in the New Solution Platform dialog (Build | Configuration Manager | Active solution platform | <New…>).

 

When you run the example, a Windows form is displayed, containing buttons that invoke basic MapForce operations:

 

Start MapForce
Create a new mapping design
Open the CompletePO.mfd file from the ...\MapForceExamples folder (note that you may need to adjust the path to point to the \MapForceExamples folder on your machine)
Generate C# code in a temp directory
Shut down MapForce

mfapi_cs_sample

 

Code listing

The listing is commented for ease of understanding. The code essentially consists of a series of handlers for the buttons in the user interface shown above.

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsFormsApplication2
{
  public partial class Form1 : Form
  {
      public Form1()
      {
          InitializeComponent();
      }
 
      // An instance of MapForce accessed via its automation interface.
      MapForceLib.Application MapForce;
 
      // Location of examples installed with MapForce
      String strExamplesFolder;
 
      private void Form1_Load(object sender, EventArgs e)
      {
      }
 
      // handler for the "Start MapForce" button
      private void StartMapForce_Click(object sender, EventArgs e)
      {
          if (MapForce == null)
          {
              Cursor.Current = Cursors.WaitCursor;
 
              // if we have no MapForce instance, we create one a nd make it visible.
              MapForce = new MapForceLib.Application();
              MapForce.Visible = true;
 
              // locate examples installed with MapForce.
              int majorVersionYear = MapForce.MajorVersion + 1998;
              strExamplesFolder = Environment.GetEnvironmentVariable("USERPROFILE") + "\\My Documents\\Altova\\MapForce" + Convert.ToString(majorVersionYear) + "\\MapForceExamples\\";
 
              Cursor.Current = Cursors.Default;
          }
          else
          {
              // if we have already an MapForce instance running we toggle its visibility flag.
              MapForce.Visible = !MapForce.Visible;
          }
      }
 
      // handler for the "Open CompletePO.mfd" button
      private void openCompletePO_Click(object sender, EventArgs e)
      {
          if (MapForce == null)
              StartMapForce_Click(null, null);
 
          // Open one of the sample files installed with the product.
          MapForce.OpenDocument(strExamplesFolder + "CompletePO.mfd");
      }
 
      // handler for the "Create new mapping" button
      private void newMapping_Click(object sender, EventArgs e)
      {
          if (MapForce == null)
              StartMapForce_Click(null, null);
 
          // Create a new mapping
          MapForce.NewMapping();
      }
 
      // handler for the "Shutdown MapForce" button
      // shut-down application instance by explicitly releasing the COM object.
      private void shutdownMapForce_Click(object sender, EventArgs e)
      {
          if (MapForce != null)
          {
              // allow shut-down of MapForce by releasing UI
              MapForce.Visible = false;
 
              // explicitly release COM object
              try
              {
                  while (System.Runtime.InteropServices.Marshal.ReleaseComObject(MapForce) > 0) ;
              }
              finally
              {
                  // avoid later access to this object.
                  MapForce = null;
              }
          }
      }
 
      // handler for button "Generate C# Code"
      private void generateCppCode_Click(object sender, EventArgs e)
      {
          if (MapForce == null)
              listBoxMessages.Items.Add("start MapForce first.");
          // COM errors get returned to C# as exceptions. We use a try/catch block to handle them.
          try
          {
              MapForceLib.Document doc = MapForce.ActiveDocument;
 
              listBoxMessages.Items.Add("Active document " + doc.Name);
              doc.GenerateCHashCode();
 
          }
          catch (Exception ex)
          {
              // The COM call was not successful.
              // Probably no application instance has been started or no document is open.
              MessageBox.Show("COM error: " + ex.Message);
          }
      }
 
      delegate void addListBoxItem_delegate(string sText);
      // called from the UI thread
      private void addListBoxItem(string sText)
      {
          listBoxMessages.Items.Add(sText);
      }
      // wrapper method to allow to call UI controls methods from a worker thread
      void syncWithUIthread(Control ctrl, addListBoxItem_delegate methodToInvoke, String sText)
      {
          // Control.Invoke: Executes on the UI thread, but calling thread waits for completion before continuing.
          // Control.BeginInvoke: Executes on the UI thread, and calling thread doesn't wait for completion.
          if (ctrl.InvokeRequired)
              ctrl.BeginInvoke(methodToInvoke, new Object[] { sText });
      }
 
      // event handler for OnDocumentOpened event
      private void handleOnDocumentOpened(MapForceLib.Document i_ipDocument)
      {
          String sText = "";
 
          if (i_ipDocument.Name.Length > 0)
              sText = "Document " + i_ipDocument.Name + " was opened!";
          else
              sText = "A new mapping was created.";
 
          // we need to synchronize the calling thread with the UI thread because
          // the COM events are triggered from a working thread
          addListBoxItem_delegate methodToInvoke = new addListBoxItem_delegate(addListBoxItem);
          // call syncWithUIthread with the following arguments:
          // 1 - listBoxMessages - list box control to display messages from COM events
          // 2 - methodToInvoke  - a C# delegate which points to the method which will be called from the UI thread
          // 3 - sText           - the text to be displayed in the list box
          syncWithUIthread(listBoxMessages, methodToInvoke, sText);
      }
     
      private void checkBoxEventOnOff_CheckedChanged(object sender, EventArgs e)
      {
          if (MapForce != null)
          {
              if (checkBoxEventOnOff.Checked)
                  MapForce.OnDocumentOpened += new MapForceLib._IApplicationEvents_OnDocumentOpenedEventHandler(handleOnDocumentOpened);
              else
                  MapForce.OnDocumentOpened -= new MapForceLib._IApplicationEvents_OnDocumentOpenedEventHandler(handleOnDocumentOpened);
          }
      }
  }
}


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