Class Helpers and Field Definations

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1 total messages Started by ziddiri40 Thu, 05 Jun 2008 13:46

#138

Author: ziddiri40
Date: Thu, 05 Jun 2008 13:46

33 lines
2289 bytes

Hi,
I'm trying to add some properties and functions to
System.Drawing.Bitmap class. My code is below:

type
  [StructLayout(LayoutKind.Sequential)]
  TPixelData = record
    Blue: Byte;
    Green: Byte;
    Red: Byte;
  end;

  BitmapHelper = class helper for System.Drawing.Bitmap
  strict private
    FRegionTransparentColor: System.Drawing.Color;
    function GetRegionTransparentColor: Color;
    procedure SetRegionTransparentColor(const Value: Color);
    function GetRegionPath: GraphicsPath;
    {$UNSAFECODE ON}function GetPixelFromPointer(Base: IntPtr; X, Y:
Integer): TPixelData; unsafe;{$UNSAFECODE OFF}
  public
    property RegionTransparentColor: Color read
GetRegionTransparentColor
      write SetRegionTransparentColor;
    property RegionPath: GraphicsPath read GetRegionPath;
  end;

Compiler says "Field definition not allowed after methods or
properties" in this line:
    FRegionTransparentColor: System.Drawing.Color;

But I think, there is no methods or properties before this field. Does
the class helper supports field definitions?

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