PowerShell 技能连载 - 用 WPF 窗口加载 Base64 编码的图片

在前一个技能中我们演示了如何将任何图片转换为 Base64 编码的字符串。今天,我们将演示如何加载 Base64 编码的图片并显示它。

这个窗口显示官方会议 logo 并且不需要独立的图片文件。该图像已经嵌入到脚本中并且直接从内存中加载。

在脚本头部的嵌入图片十分大。最重要的部分是在 Base64 编码字符串之后的 Convert-Base64Bitmap2Picture 函数。它接受 Base64 编码的文本并且返回一个 bitmap 对象。这个对象可以设为任何 WPF image 控件的源。

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Add-Type -AssemblyName PresentationFramework

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function Convert-Base64Bitmap2Picture
{
param([Parameter(Mandatory=$true)]$Base64Text)

$bitmap = New-Object System.Windows.Media.Imaging.BitmapImage
$bitmap.BeginInit()
$bitmap.StreamSource = [System.IO.MemoryStream][System.Convert]::FromBase64String($base64Text)
$bitmap.EndInit()
$bitmap.Freeze()
$bitmap
}


$xaml = @'
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
FontFamily="SegoeUI" Foreground="White" SizeToContent="Width"
Title="Join the PowerShell Conference EU 2016, April 20-22">
<Grid>
<Image Name="Img1" Margin="20" HorizontalAlignment="Center"/>
<TextBlock TextAlignment="Center" VerticalAlignment="Center" FontSize="40" HorizontalAlignment="Center">
<TextBlock.Effect><DropShadowEffect ShadowDepth="4" Color="DarkGray" BlurRadius="4"/></TextBlock.Effect>
Join the PowerShell<LineBreak/>Conference EU 2016!<LineBreak/><LineBreak/>www.psconf.eu
</TextBlock>
</Grid>
</Window>
'@

$reader = [System.XML.XMLReader]::Create([System.IO.StringReader]$XAML)
$window = [System.Windows.Markup.XAMLReader]::Load($reader)
$image = $window.FindName('Img1')
$image.Source = Convert-Base64Bitmap2Picture -Base64Text $Picture1
$window.ShowDialog()

本文国际来源:Loading a Base64-encoded Picture into WPF Window

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