MonoTouch의 CGBitmapContext가 잘못된 핸들 예외를 던졌습니다

Question

MonoTouch를 처음 사용하고 있으며 표준 C# 코드를 MonoTouch 호환 코드로 변환하여 최근에 iPhone 응용 프로그램 내에서 사용할 수있게되었습니다.

System.Exception: Invalid handle 
    at MonoTouch.CoreGraphics.CGContext..ctor (IntPtr handle, Boolean owns) [0x00022] in /Developer/MonoTouch/Source/monotouch/src/shared/CoreGraphics/CGContext.cs:136 
    at MonoTouch.CoreGraphics.CGBitmapContext..ctor (IntPtr data, Int32 width, Int32 height, Int32 bitsPerComponent, Int32 bytesPerRow, MonoTouch.CoreGraphics.CGColorSpace colorSpace, CGImageAlphaInfo bitmapInfo) [0x00000] in <filename unknown>:0 
    at Jargoon.Data.Arcs.Loader.ExtractWriteableBitmap (Jargoon.Data.Arcs.Records.RGBPaletteRecord rgbPalette, Double dpi, Jargoon.Data.Arcs.Raschts.ChartIndexFile indexFile, Jargoon.Data.Arcs.Raschts.RasterChartFile chartFile) [0x00079] in /Users/jacknutkins/Desktop/Jargoon/ARCSViewer/ARCSViewer/Loader.cs:569 
    at Jargoon.Data.Arcs.Loader.GetHiResImage (Jargoon.Data.Arcs.Records.RGBPaletteRecord rgbPalette) [0x00000] in /Users/jacknutkins/Desktop/Jargoon/ARCSViewer/ARCSViewer/Loader.cs:361 
    at ARCSViewer.ARCSViewerViewController.ViewDidLoad() [0x0001c] in /Users/jacknutkins/Desktop/Jargoon/ARCSViewer/ARCSViewer/ARCSViewerViewController.cs:37 
    at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) 
    at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00042] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:29 
    at ARCSViewer.Application.Main (System.String[] args) [0x00000] in /Users/jacknutkins/Desktop/Jargoon/ARCSViewer/ARCSViewer/Main.cs:17 

: 여기

private CGBitmapContext ExtractWriteableBitmap(RGBPaletteRecord rgbPalette, double dpi, ChartIndexFile indexFile, RasterChartFile chartFile) 
     { 
      CGBitmapContext bitmapImage = null; 
      TileRecord tile; 

      // calc the number of tiles in each plane 
      int tileCountX = indexFile.TileIndexRecords.Max(ti => ti.X); 
      int tileCountY = indexFile.TileIndexRecords.Max(ti => ti.Y); 

      // create the big picture 
      int pixelWidth = (tileCountX + 1) * TileRecord.PixelWidth; 
      int pixelHeight = (tileCountY + 1) * TileRecord.PixelHight; 

      int intDPI = Convert.ToInt32(dpi); 

      int bytesPerRow = (int)TileRecord.PixelWidth * 4; // note that bytes per row should 
    //be based on width, not height. 

      CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB(); 
      CGImageAlphaInfo info = CGImageAlphaInfo.NoneSkipFirst; 

      // create the big picture 
      bitmapImage = new CGBitmapContext(System.IntPtr.Zero, pixelWidth, pixelHeight, intDPI, intDPI, colorSpace, info); 

      byte[] sourceArray; 
      RectangleF sourceRect; 

      //copy the tiles into the big picture 
      int index = 0; 
      foreach (TileIndexRecord tileIndexRecord in indexFile.TileIndexRecords) 
      { 
       // get the tile record 
       tile = chartFile.TileRecords[index]; 

       // extract the byte array for the given palette 
       sourceArray = tile.GetBytes(rgbPalette); 

       GCHandle pinnedArray = GCHandle.Alloc(sourceArray, GCHandleType.Pinned); 
       IntPtr pointer = pinnedArray.AddrOfPinnedObject(); 
       //do your stuff 
       //pinnedArray.Free(); 

       CGImage image = new CGImage(pointer); 
       sourceRect = new RectangleF(0, 0, TileRecord.PixelWidth, TileRecord.PixelHight); 

       bitmapImage.DrawImage(new RectangleF(0,0,128,128),image); 

       // copy the tile image into the big picture 
       //bitmapImage.WritePixels(sourceRect, sourceArray, TileRecord.Stride, (tileIndexRecord.X * TileRecord.PixelWidth), (tileIndexRecord.Y * TileRecord.PixelHight)); 

       // increment the index 
       index++; 
      } 
      return bitmapImage; 
     } 

스택 추적입니다 : 그러나 나는 내가 비트 맵 컨텍스트를 반환하는 데 사용하는이 방법에 문제로 실행 한 코드를 변환하는 데 성공했습니다 세드릭 MonoTouch 그렇게 시도하고 부담 나와 함께 그 눈부시게 분명하지만 만약 누군가가 설명 할 수에 내가 아주 새로운 해요

// create the big picture 
      bitmapImage = new CGBitmapContext(System.IntPtr.Zero, pixelWidth, pixelHeight, intDPI, intDPI, colorSpace, info); 

: 오류가 줄에서 발생?

Answer 1

일반적으로 메모리 부족 현상이 발생합니다. (장치) 콘솔은 일반적으로 더 많은 정보를 인쇄합니다.

내 생각 엔 당신이 만들고있는 CGBitmapContext를 해제하지 않는다고 생각합니다.