WP7试图创建WriteableBitmap实例时出现崩溃

每个人，在将图片保存到媒体库时遇到了一个奇怪的问题，我的应用程序崩溃而未出现异常。这是我的保存代码。WP7试图创建WriteableBitmap实例时出现崩溃

using (MemoryStream stream = new MemoryStream()) 
{ 
    try 
    { 
     WriteableBitmap bitmap = new WriteableBitmap(InkPrest, InkPrest.RenderTransform); // Crash here, the actualHeight of InkPrest is 2370.0 

     bitmap.SaveJpeg(stream, (int)InkPrest.ActualWidth, (int)InkPrest.ActualHeight, 0, 100); 
     stream.Seek(0, SeekOrigin.Begin); 

     MediaLibrary library = new MediaLibrary(); 
     library.SavePicture(DateTime.Now.ToString(), stream.GetBuffer()); 
    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message); 
    } 
}

我已经debuged一步一个脚印，在

WriteableBitmap bitmap = new WriteableBitmap(InkPrest, InkPrest.RenderTransform); // Crash here, the actualHeight of InkPrest is 2370.0

解决这个问题的任何想法的应用程序崩溃？

============================================

尝试保存多个图像

的UIElement是704 * 2370

TranslateTransform transform = new TranslateTransform(); 
transform.Transform(new Point(0,0)); 
double MaxHeight = 800; 
double height = InkPrest.ActualHeight; 
int saveCount = 0; 
int succeedCount = 0; 
while (height > 0) 
{ 
    using (MemoryStream stream = new MemoryStream()) 
    { 
     try 
     { 
      double actualRenderHeight = Math.Min(height, MaxHeight); 
      WriteableBitmap bitmap = new WriteableBitmap((int)InkPrest.ActualWidth, (int)actualRenderHeight); 

      bitmap.Render(InkPrest, transform); //Crash here, also no exception. 
      bitmap.Invalidate(); 

      height -= actualRenderHeight; 
      transform.Y -= actualRenderHeight; 

      bitmap.SaveJpeg(stream, (int)InkPrest.ActualWidth, (int)actualRenderHeight, 0, 100); 
      stream.Seek(0, SeekOrigin.Begin); 

      MediaLibrary library = new MediaLibrary(); 
      Picture pic = library.SavePicture(manuscriptFile.Title + DateTime.Now.ToString(), stream.GetBuffer()); 
      saveCount++; 
      if (pic != null) 
      { 
       succeedCount++; 
      } 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show(ex.Message); 
     } 
    } 
}

来源

2012-05-01 Wp7Beginner

这是在模拟器上，还是只在真实的设备上？ –

都在仿真器和设备上。崩溃没有例外。 – Wp7Beginner

我想碰撞共振是我的图片比2000年更久。我正在测试它。 – Wp7Beginner

确定你是否在uithread或一些其他创建的线程WriteableBitmap的实例。你需要在uithread中创建writeablebitmap。

来源

2012-09-03 12:43:40 nucleons

WP7试图创建WriteableBitmap实例时出现崩溃

回答

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