使用WriteableBitmapEx访问像素颜色时出现AccessViolationException [英] AccessViolationException when accessing pixel color using WriteableBitmapEx

问题描述

我正在使用 WriteableBitmapEx 库来编辑使用Windows 8 Pro平板电脑的凸轮拍摄的图像.每次我调用GetPixel()函数时都会得到一个AccessViolationException，这是代码:

I'm using WriteableBitmapEx library to edit an image taken with tablet's cam with Windows 8 Pro. I'm getting an AccessViolationException every time I call to GetPixel() function, here's the code:

Windows.Media.Capture.MediaCapture captureMgr = new MediaCapture();
await captureMgr.InitializeAsync();

IRandomAccessStream memoryStream = new InMemoryRandomAccessStream();
await captureMgr.CapturePhotoToStreamAsync(imageProperties, memoryStream);
await memoryStream.FlushAsync();
memoryStream.Seek(0);

WriteableBitmap tmpImage = new WriteableBitmap(1, 1); 
tmpImage.SetSource(memoryStream);
tmpImage.GetPixel(1, 1); // An AccessViolationException occurs.

我做错了什么?

推荐答案

尝试使用内置方法来创建您的WriteableBitmap.

Try using the built in methods to create your WriteableBitmap instead.

WriteableBitmap tmpImage = await BitmapFactory.New(1, 1).FromStream(memoryStream);  
tmpImage.GetPixel(1, 1);

这应该确保您的图像在访问之前已加载到WriteableBitmap中.

This should ensure that your image has been loaded into the WriteableBitmap before being accessed.

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