Implementing a C STORE AddIn

1. Choose File->New->Project from the menu.
2. In the New Project dialog box, choose either "Visual C#" or "VB" in the Projects Type List, and choose " Class Library" in the Templates List.
3. Type the project name as "SampleAddIn" in the Project Name field, and then choose OK. If desired, type a new location for your project or select a directory using the Browse button, and then choose OK.

4. In the "Solution Explorer" window right-click on the "References" folder, and select "Add Reference..." from the context menu. In the "Add Reference" dialog box, select the "Browse" tab and browse to the Leadtools for .NET "C:\LEADTOOLS 20\Bin\DotNet\Win32" folder and select the following DLLS:

   • Leadtools.dll
   • Leadtools.Dicom.dll
   • Leadtools.Dicom.AddIn.dll
   • Microsoft.Practices.Unity

5. Click the OK button to add the above DLLs to the application.

6. In the "Solution Explorer" window right-click "SampleAddIn" and select Add->Class from the context menu. In the "Add New Item" dialog, type Module.cs in the "Name" field. Click "Add" to add the class to the project.

7. Open the Module.cs file and add the following using statements:

   C#

   using Leadtools.Dicom.AddIn; 
   using Leadtools.Dicom.AddIn.Attributes; 
   using System.IO; 

8. Define the module class as listed below:

   C#

   public class Module : ModuleInit 
   { 
      private static string _ImageDirectory = string.Empty; 
      public static string ImageDirectory 
      { 
         get 
         { 
            return _ImageDirectory; 
         } 
      } 
                       
      public override void Load(string ServiceDirectory, string DisplayName) 
      { 
         string dir = ServiceDirectory + @"\Images\"; 
         if(!Directory.Exists(dir)) 
            Directory.CreateDirectory(dir); 
                          
         _ImageDirectory = dir; 
      } 
   }        

   When this add-in loads, the Load function is called by the LEADTOOLS PACS Framework. This class checks for the Images directory. If the directory does not exist, it is created by the add-in.

9. In the "Solution Explorer" window right-click Class1.cs and select Rename from the context menu. Type CStoreAddIn.cs and press Enter.

10. Open the CStoreAddIn.cs file and add the following using statements:

    C#

    using Leadtools.Dicom; 
    using Leadtools.Dicom.AddIn; 
    using Leadtools.Dicom.AddIn.Interfaces; 
    using Microsoft.Practices.Unity; 

11. Add IProcessCStore to the CStoreAddIn class derivation list. Your class should look like the following:

    C#

    public class CStoreAddIn : IProcessCStore 
    { 
    }        

12. Right-click on IProcessCStore and select "Implement Interface-> Implement Interface" from the context menu. Your class should now look as follows:

    C#

    [DicomAddInAttribute("CStore","1.0.0.0",Description="DICOM Storage",Author="")] 
    public class CStoreAddIn : IProcessCStore 
    { 
       #region IProcessCStore Members 
       public DicomCommandStatusType OnStore(DicomClient Client, byte PresentationId, int MessageId, string AffectedClass, string Instance, DicomCommandPriorityType Priority, string MoveAE, int MoveMessageId, DicomDataSet Request) 
       { 
          throw new NotImplementedException(); 
       } 
                        
       #endregion 
       #region IProcessBreak Members 
       public void Break(BreakType type) 
       { 
          throw new NotImplementedException(); 
       } 
       #endregion 
    } 

13. To tell the server what we are interested in, we need to specify PresentationContextAttributes for the OnStore method. This will allow the server to build an association for use when a client connections. For this example we will only store CT images. Thus, we need to enter the following attributes for the OnStore method:

    C#

    [PresentationContext(DicomUidType.CTImageStorage,  
    DicomUidType.ImplicitVRLittleEndian, 
    DicomUidType.JPEG2000, 
    DicomUidType.JPEG2000LosslessOnly, 
    DicomUidType.JPEGBaseline1, 
    DicomUidType.JPEGExtended2_4, 
    DicomUidType.ExplicitVRBigEndian, 
    DicomUidType.ExplicitVRLittleEndian, 
    DicomUidType.JPEGLosslessNonhier14,                                                  
    DicomUidType.JPEGLosslessNonhier14B)] 
    public DicomCommandStatusType OnStore(DicomClient Client, byte PresentationId, int MessageId, string AffectedClass, string Instance, DicomCommandPriorityType Priority, string MoveAE, int MoveMessageId, DicomDataSet Request) 

    This makes it possible to store CT images with the above transfer syntaxes.

14. Add the code to the OnStore method to save the image to disk. Your OnStore method should look like the following:

    C#

    public DicomCommandStatusType OnStore(DicomClient Client, byte PresentationId, int MessageId, string AffectedClass, string Instance, DicomCommandPriorityType Priority, string MoveAE, int MoveMessageId, DicomDataSet Request) 
    { 
       DicomCommandStatusType status = DicomCommandStatusType.Success; 
       try 
       { 
          if(Request!=null) 
          { 
             string sop = Request.GetValue(DicomTag.SOPInstanceUID, string.Empty); 
             if(string.IsNullOrEmpty(sop)) 
                status = DicomCommandStatusType.ProcessingFailure; 
             else 
             { 
                string file = string.Format("{0}{1}.dic", Module.ImageDirectory,sop); 
                Request.Save(file, DicomDataSetSaveFlags.None); 
             } 
          } 
       } 
       catch(Exception e) 
       { 
          status = DicomCommandStatusType.ProcessingFailure; 
       } 
       return status; 
    }        

15. Build the class library and take the output and put it in the 'AddIn' directory of your previously created server.

16. If the server is running, stop it. Start the server.
17. Connect and store a CT Image.