Get/Set image paths in drawing using .NET API

By Balaji Ramamoorthy

To Get and set Image file name use the properties SourceFileName and ActiveFileName of RasterImageDef.
 
Here is a sample code that changes the image file path of a raster image.
To try the below code add a raster image from UI, load the .Net dll and
issue the command “editImage”.

Note:
Change the file name specified (for functions SourceFileName and ActiveFileName )in the below code
to some valid file name.

[CommandMethod("editImagePath")]
public void EditImagePath() 
{
    Database db = HostApplicationServices.WorkingDatabase;
    Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
 
    PromptEntityOptions peo = new PromptEntityOptions("nSelect an Image");
    peo.SetRejectMessage("nSelected entity must be an image.");
    peo.AddAllowedClass(typeof(RasterImage), false);
 
    PromptEntityResult per = ed.GetEntity(peo);
    if (per.Status != PromptStatus.OK)
        return;
 
    ObjectId imageId = per.ObjectId;
 
    try
    {
        using (Transaction trans = db.TransactionManager.StartTransaction())
        {
            RasterImage myImage = trans.GetObject(imageId, OpenMode.ForRead) as RasterImage;
            RasterImageDef imageDef = trans.GetObject(myImage.ImageDefId, OpenMode.ForWrite) as RasterImageDef;
 
            ed.WriteMessage(imageDef.ActiveFileName);
 
            imageDef.SourceFileName = "C:\Temp\Bruno.jpg";
            imageDef.ActiveFileName = "C:\Temp\Bruno.jpg";
 
            imageDef.Load();
 
            trans.Commit();
        }
    }
    catch (System.Exception ex)
    {
        ed.WriteMessage(ex.Message);
    }
}