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我需要將BitmapImage
轉換爲byte[]
,這樣我才能將這些數據存儲在SQLite數據庫中,而相反地加載它。在UWP中將BitmapImage轉換爲byte [],然後在sqlite中插入
我的XAML有一個形象:
<Image x:Name="image" HorizontalAlignment="Left" Height="254" Margin="50,117,0,0" VerticalAlignment="Top" Width="244" Source="Assets/LockScreenLogo.png"/>
我的C#代碼:
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
BitmapImage test = new BitmapImage();
test = (BitmapImage)image.Source;
image.Source = test;
byte[] array = ImageToByte(test);
Database.CreateDB();
Database.InsertData(array);
}
#region convert
public byte[] ImageToByte(BitmapImage image)
{
//WriteableBitmap wb;
using (InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream())
{
image.SetSource(ms);
WriteableBitmap wb = new WriteableBitmap(244, 254);
wb.SetSource(ms);
using (Stream stream = wb.PixelBuffer.AsStream())
using (MemoryStream memoryStream = new MemoryStream())
{
stream.CopyTo(memoryStream);
return memoryStream.ToArray();
}
}
}
public BitmapImage ByteToImage(byte[] array)
{
BitmapImage image = new BitmapImage();
using (InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream())
{
stream.AsStreamForWrite().Write(array, 0, array.Length);
stream.Seek(0);
image.SetSource(stream);
}
return image;
}
#endregion
}
這是行不通的。
異常消息:
「類型‘System.ArgumentNullException’的一個例外發生在mscorlib.ni.dll但在用戶代碼中沒有處理
其他信息:值不能爲空。」
有人可以幫助我嗎?
[在UWP中將BitmapImage轉換爲字節數組]可能的副本(http://stackoverflow.com/questions/36108056/convert-a-bitmapimage-to-byte-array-in-uwp) – Clemens