コード例 #1
0
ファイル: Cursor.cs プロジェクト: jonfortescue/winforms
        /// <summary>
        ///  Loads a picture from the requested stream.
        /// </summary>
        private void LoadPicture(UnsafeNativeMethods.IStream stream)
        {
            if (stream == null)
            {
                throw new ArgumentNullException(nameof(stream));
            }
            try
            {
                Guid g = typeof(UnsafeNativeMethods.IPicture).GUID;
                UnsafeNativeMethods.IPicture picture = null;

                try
                {
                    picture = UnsafeNativeMethods.OleCreateIPictureIndirect(null, ref g, true);
                    UnsafeNativeMethods.IPersistStream ipictureAsIPersist = (UnsafeNativeMethods.IPersistStream)picture;
                    ipictureAsIPersist.Load(stream);

                    if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
                    {
                        IntPtr cursorHandle = picture.GetHandle();
                        Size   picSize      = GetIconSize(cursorHandle);
                        if (DpiHelper.IsScalingRequired)
                        {
                            picSize = DpiHelper.LogicalToDeviceUnits(picSize);
                        }

                        handle = SafeNativeMethods.CopyImage(
                            new HandleRef(this, cursorHandle),
                            NativeMethods.IMAGE_CURSOR,
                            picSize.Width,
                            picSize.Height,
                            0);

                        ownHandle = true;
                    }
                    else
                    {
                        throw new ArgumentException(string.Format(SR.InvalidPictureType,
                                                                  "picture",
                                                                  "Cursor"), "picture");
                    }
                }
                finally
                {
                    // destroy the picture...
                    if (picture != null)
                    {
                        Marshal.ReleaseComObject(picture);
                    }
                }
            }
            catch (COMException e)
            {
                Debug.Fail(e.ToString());
                throw new ArgumentException(SR.InvalidPictureFormat, "stream", e);
            }
        }
コード例 #2
0
        /// <include file='doc\Cursor.uex' path='docs/doc[@for="Cursor.CopyHandle"]/*' />
        /// <devdoc>
        ///    Duplicates this the Win32 handle of this <see cref='System.Windows.Forms.Cursor'/>.
        /// </devdoc>
        public IntPtr CopyHandle()
        {
            Size sz = Size;

            return(SafeNativeMethods.CopyImage(new HandleRef(this, Handle), NativeMethods.IMAGE_CURSOR, sz.Width, sz.Height, 0));
        }