我在存储 FlowDocument ( Card.xaml )和包含图像的文件夹( Media )时有一个zip文件。我的 FlowDocument 中的图像具有 Tag ,其中存储了相对于FlowDocument的路径。对于使用FlowDocument( FindImages 方法)的图像搜索:Finding all images in a FlowDocument
我如何在 RichTextBox 中打开此zip。请注意我如何创建此图像(位图),也许是那里的问题,但我不明白这是怎么回事:
string nameOfXamlCardDefault = "Card.xaml";
private void Open_Executed(object sender, ExecutedRoutedEventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
if (dlg.ShowDialog() == true)
{
//Open zip file
using (FileStream fullCardZipFile = File.Open(dlg.FileName, FileMode.Open, FileAccess.ReadWrite))
{
//Open zip by ZipArchive
using (ZipArchive archive = new ZipArchive(fullCardZipFile, ZipArchiveMode.Update))
{
//Get entry for xaml (FlowDocument)
ZipArchiveEntry xamlFileEntry = archive.GetEntry(nameOfXamlCardDefault);
//Open xaml
using (Stream xamlFileStreamInZip = xamlFileEntry.Open())
{
//Load FlowDocument into rtbEditor.Document
rtbEditor.Document = XamlReader.Load(xamlFileStreamInZip) as FlowDocument;
//Searching images
List<Image> images = FindImages(rtbEditor.Document).ToList();
foreach (var image in images)
{
var imageFileEntry = archive.GetEntry(image.Tag.ToString());
var bitmap = new BitmapImage();
using (Stream imageFileStream = imageFileEntry.Open())
{
var memoryStream = new MemoryStream();
imageFileStream.CopyTo(memoryStream);
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.StreamSource = memoryStream;
bitmap.EndInit();
image.Source = bitmap;
}
}
}
}
}
}
return;
}
RichTextBox 中的所有图像都能很好地显示,但是 BitmapImage 中没有 StreamSource 。以后会导致错误:
<FlowDocument xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" NumberSubstitution.CultureSource="User" AllowDrop="True" PagePadding="5,0,5,0">
<Paragraph>
<Image Tag="Media/image0.png">
<Image.Source>
<BitmapImage CacheOption="OnLoad" BaseUri="{x:Null}"/>
</Image.Source>
</Image>
<Image Tag="Media/image1.png">
<Image.Source>
<BitmapImage CacheOption="OnLoad" BaseUri="{x:Null}"/>
</Image.Source>
</Image>
</Paragraph>
如果仅复制图像并粘贴到 RichTextBox 中,则看起来像这样,这很好:
<Image Height="400" Width="600">
<Image.Source>
<BitmapImage CacheOption="OnLoad" UriSource="./Image1.bmp"
BaseUri="pack://payload:,,wpf1,/Xaml/Document.xaml"/>
</Image.Source>
是否可以嵌入 zip 中的图像,例如复制并粘贴?我尝试使用剪贴板并与 MemoryStream 一起使用。但这没有帮助。
答案 0 :(得分:1)
复制位图数据后,应通过设置其Position
属性或调用其Seek()
方法来倒回MemoryStream。
var imageFileEntry = archive.GetEntry(image.Tag.ToString());
if (imageFileEntry != null)
{
using (var imageFileStream = imageFileEntry.Open())
using (var memoryStream = new MemoryStream())
{
imageFileStream.CopyTo(memoryStream);
memoryStream.Position = 0; // here
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.StreamSource = memoryStream;
bitmap.EndInit();
image.Source = bitmap;
}
}
您也可以从流中解码BitmapImage
来代替BitmapFrame
。
var imageFileEntry = archive.GetEntry(image.Tag.ToString());
if (imageFileEntry != null)
{
using (var imageFileStream = imageFileEntry.Open())
using (var memoryStream = new MemoryStream())
{
imageFileStream.CopyTo(memoryStream);
memoryStream.Position = 0;
image.Source = BitmapFrame.Create(
memoryStream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
}
}