如何获得图像的像素在win8的应用

Question

在C＃来比较像素的图片，我们可以使用，

 Bitmap b1 = new Bitmap(textBox1.Text); 
     Bitmap b2 = new Bitmap(textBox2.Text);  
      for (int x = 0; x < b1.Width; x++) 
      { 
       for (int y = 0; y < b1.Height; y++) 
       { 
        if (b1.GetPixel(x, y) != b2.GetPixel(x, y)) 
        { 
         Console.Out.Write("Mismatch"); 
        } 
       } 
      } 

在WinRT中应用像素怎样才能获得通过这种方式比较呢？

在此先感谢

Answer 1

using System; 
using System.Diagnostics; 
using System.IO; 
using System.Linq; 
using System.Runtime.InteropServices.WindowsRuntime; 
using System.Threading.Tasks; 
using Windows.ApplicationModel; 
using Windows.UI.Popups; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Media.Imaging; 

namespace App110 
{ 
    public sealed partial class MainPage : Page 
    { 
     public MainPage() 
     { 
      this.InitializeComponent(); 
      Test(); 
     } 

     private async void Test() 
     { 
      // Comparing image to itself should return true 
      Debug.Assert(await ComparePackageImages("Assets\\Logo.png", "Assets\\Logo.png")); 

      // "Copy of Logo.png" is "Logo.png" with changed one pixel 
      // and should return false when compared with "Logo.png" 
      Debug.Assert(!await ComparePackageImages("Assets\\Logo.png", "Assets\\Copy of Logo.png")); 

      // Two images of different size should 
      Debug.Assert(!await ComparePackageImages("Assets\\Logo.png", "Assets\\SmallLogo.png")); 

      await new MessageDialog("Success!").ShowAsync(); 
      Application.Current.Exit(); 
     } 

     private async Task<bool> ComparePackageImages(string packageFilePath1, string packageFilePath2) 
     { 
      var b1 = await LoadWriteableBitmapFromPackageFilePath(packageFilePath1); 
      var b2 = await LoadWriteableBitmapFromPackageFilePath(packageFilePath2); 

      var pixelStream1 = b1.PixelBuffer.AsStream(); 
      var pixelStream2 = b2.PixelBuffer.AsStream(); 

      return StreamEquals(pixelStream1, pixelStream2); 
     } 

     private static async Task<WriteableBitmap> LoadWriteableBitmapFromPackageFilePath(string packageFilePath1) 
     { 
      var bitmap = new WriteableBitmap(1, 1); 
      var storageFile = await Package.Current.InstalledLocation.GetFileAsync(packageFilePath1); 

      using (var streamWithContentType = await storageFile.OpenReadAsync()) 
      { 
       await bitmap.SetSourceAsync(streamWithContentType); 
      } 

      return bitmap; 
     } 

     static bool StreamEquals(Stream stream1, Stream stream2) 
     { 
      const int bufferSize = 2048; 
      byte[] buffer1 = new byte[bufferSize]; //buffer size 
      byte[] buffer2 = new byte[bufferSize]; 

      while (true) 
      { 
       int count1 = stream1.Read(buffer1, 0, bufferSize); 
       int count2 = stream2.Read(buffer2, 0, bufferSize); 

       if (count1 != count2) 
        return false; 

       if (count1 == 0) 
        return true; 

       // You might replace the following with an efficient "memcmp" 
       if (!buffer1.Take(count1).SequenceEqual(buffer2.Take(count2))) 
        return false; 
      } 
     } 
    } 
} 

的Compare binary files in C#流比较礼貌。

位图接入代码片段WinRT XAML Toolkit礼貌。