Latest Contributions by AndreasEkstrand

Hi, I'm using ArcObjects in C# .NET to create an ArcMap add-in for ArcGIS 10.2.1. I add the attached shape file as a layer to a document in ArcMap, enable Labels and set its Display Field to different fields, e.g. DETALJTYP. But the only field name that I can get programmatically from IFeatureLayer.DisplayField is EXTERNID, and I can't see why? It works fine with other layers. Any idea what's going on? Regards, Andreas Ekstrand ... View more

When creating a new point layer with picture symbols in ArcMap 10.2.1 using ArcObjects, I have tried several ways to load semi-transparent symbol images from .png files, but to no avail, the transparency is always lost and appearing opaque. Since IPictureMarkerSymbol.CreateMarkerSymbolFromFile doesn't handle .png, I think I will have to create the IPictureDisp myself. I know it should work somehow, since I can load the same semi-transparent .png file manually in the picture symbol in ArcMap, resulting in correct semi-transparency. And I know about the support for setting a transparency color, but it wouldn't handle semi-transparency. My current solution, inspired from this post, goes something like this (except for the creation of the actual layer) but doesn't work either: class IPictureDispConverter {   public static Guid iPictureDispGuid = typeof(stdole.IPictureDisp).GUID;   /// Converts an Icon into a IPictureDisp   public static IPictureDisp ConvertBitmapToIPictureDisp(Bitmap bitmap)   {     PICTDESC.Bitmap pictBit = new PICTDESC.Bitmap(bitmap);     return OleCreatePictureIndirect(pictBit, ref iPictureDispGuid, true);   }   [DllImport("OleAut32.dll", EntryPoint = "OleCreatePictureIndirect", ExactSpelling = true, PreserveSig = false)]   private static extern stdole.IPictureDisp OleCreatePictureIndirect([MarshalAs(UnmanagedType.AsAny)] object picdesc, ref Guid iid, bool fOwn);   // WINFORMS COMMENT:   // PICTDESC is a union in native, so we'll just   // define different ones for the different types   // the "unused" fields are there to make it the right   // size, since the struct in native is as big as the biggest   // union.   private static class PICTDESC   {     //Picture Types     public const short PICTYPE_UNINITIALIZED = -1;     public const short PICTYPE_NONE = 0;     public const short PICTYPE_BITMAP = 1;     public const short PICTYPE_METAFILE = 2;     public const short PICTYPE_ICON = 3;     public const short PICTYPE_ENHMETAFILE = 4;     [StructLayout(LayoutKind.Sequential)]     public class Icon     {       internal int cbSizeOfStruct = Marshal.SizeOf(typeof(PICTDESC.Icon));       internal int picType = PICTDESC.PICTYPE_ICON;       internal IntPtr hicon = IntPtr.Zero;       internal int unused1 = 0;       internal int unused2 = 0;       internal Icon(System.Drawing.Icon icon)       {         this.hicon = icon.ToBitmap().GetHicon();       }     }     [StructLayout(LayoutKind.Sequential)]     public class Bitmap     {       internal int cbSizeOfStruct = Marshal.SizeOf(typeof(PICTDESC.Bitmap));       internal int picType = PICTDESC.PICTYPE_BITMAP;       internal IntPtr hbitmap = IntPtr.Zero;       internal IntPtr hpal = IntPtr.Zero;       internal int unused = 0;       internal Bitmap(System.Drawing.Bitmap bitmap)       {         this.hbitmap = bitmap.GetHbitmap();       }     }   } } // FROM ANOTHER PART OF THE CODE: IPictureMarkerSymbol markerSymbol = new PictureMarkerSymbolClass(); Bitmap bitmap = new Bitmap(pngFilename); markerSymbol.Picture = IPictureDispConverter.ConvertBitmapToIPictureDisp(bitmap); ISimpleRenderer renderer = new SimpleRendererClass(); ((IGeoFeatureLayer)layer).Renderer = renderer as IFeatureRenderer; renderer.Symbol = markerSymbol.Picture as ISymbol; Here is the result with my code: And here it is when I have pointed out the same .png file manually for the same layer in ArcMap afterwards: Does anyone know how to do this properly? ... View more