TECH TIP: Using the JITPipeilne OnGetPicture Event to Display Images

Question: “I am using a JITPipeline to output data stored in a series of stringlists,
one of these stringlists contains the names of a graphic. How can I use the JITPipeline.OnGetPicture Event to display an image?”

Solution:

1. Use JITPipeline fields editor to declare a Field with FieldType = dtGraphic. For this example, set the FieldName to ‘Graphic’. Create a second Field with FieldType = dtString and set the FieldName to ‘GraphicFile’.
2. In the Report Designer, create a DBImage component and connect to the Graphic field.
3. Use the Delphi code editor to declare a private variable for your form:

     private
        FPicture: TPicture;

    

4. In the FormCreate event instantiate the picture object:

   procedure TForm1.FormCreate(Sender: TObject);
   begin
   
     FPicture := TPicture.Create;
   
   end;

    

5. In the FormDestroy event, free the picture object:

   procedure TForm1.FormDestroy(Sender: TObject);
   begin
   
     FPicture.Free;
   
   end;

    

6. In the JITPipeline.OnGetPicture event, load the picture:

   function TForm1.ppJITPipeline1GetFieldAsPicture(aFieldName: String): TPicture;
   var
     lsFileName: String;
   begin
   
     if aFieldName = 'Graphic' then
       begin
         lsFileName := JITPipeline['GraphicFile'];
   
         FPicture.LoadFromFile(lsFileName);
       end;
      
     Result :=  FPicture;
   
   end;