Joe*_*arp 7 c# wpf serialization image richtextbox
我有一个richtextbox,我打算保存到数据库,可以将其加载回同一个richtextbox.我已经将它工作,以便我可以将flowdocument保存为DataFormats.XamlPackage,它可以保存图像,但问题是文本无法搜索.使用DataFormats.Xaml,我当然有文本,但没有图像.图像将由最终用户粘贴,而不是应用程序附带的图像.
我尝试使用XamlWriter将文本转换为XML,然后单独从文档中获取图像并将它们作为二进制文件插入到XML中,但我似乎无法找到将图像转换为二进制文件的方法...
有没有人有关于如何将图像分成二进制,与文本分开的想法？
提前致谢!
GetImageByteArray()就是问题所在.
码:
private void SaveXML()
{
TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
FlowDocument flowDocument = richTextBox.Document;
using (StringWriter stringwriter = new StringWriter())
{
using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
{
XamlWriter.Save(flowDocument, writer );
}
testRTF t = new testRTF();
t.RtfText = new byte[0];
t.RtfXML = GetImagesXML(flowDocument);
t.RtfFullText = stringwriter.ToString();
//save t to database
}
richTextBox.Document.Blocks.Clear();
}
private string GetImagesXML(FlowDocument flowDocument)
{
using (StringWriter stringwriter = new StringWriter())
{
using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
{
Type inlineType;
InlineUIContainer uic;
System.Windows.Controls.Image replacementImage;
byte[] bytes;
System.Text.ASCIIEncoding enc;
//loop through replacing images in the flowdoc with the byte versions
foreach (Block b in flowDocument.Blocks)
{
foreach (Inline i in ((Paragraph)b).Inlines)
{
inlineType = i.GetType();
if (inlineType == typeof(Run))
{
//The inline is TEXT!!!
}
else if (inlineType == typeof(InlineUIContainer))
{
//The inline has an object, likely an IMAGE!!!
uic = ((InlineUIContainer)i);
//if it is an image
if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
{
//grab the image
replacementImage = (System.Windows.Controls.Image)uic.Child;
//get its byte array
bytes = GetImageByteArray((BitmapImage)replacementImage.Source);
//write the element
writer.WriteStartElement("Image");
//put the bytes into the tag
enc = new System.Text.ASCIIEncoding();
writer.WriteString(enc.GetString(bytes));
//close the element
writer.WriteEndElement();
}
}
}
}
}
return stringwriter.ToString();
}
}
//This function is where the problem is, i need a way to get the byte array
private byte[] GetImageByteArray(BitmapImage bi)
{
byte[] result = new byte[0];
using (MemoryStream ms = new MemoryStream())
{
XamlWriter.Save(bi, ms);
//result = new byte[ms.Length];
result = ms.ToArray();
}
return result;
}
UPDATE
我想我可能终于找到了一个解决方案,我将在下面发布.它使用BmpBitmapEncoder和BmpBitmapDecoder.这允许我从位图图像中获取二进制文件,将其存储到数据库中,然后将其加载回来并将其显示回FlowDocument.初步测试证明是成功的.出于测试目的,我绕过了我的数据库步骤,基本上通过创建二进制文件来复制图像,然后获取二进制文件并将其转换为新图像并将其添加到FlowDocument中.唯一的问题是当我尝试使用修改后的FlowDocument并使用XamlWriter.Save函数时,它在新创建的图像上出现错误,"无法序列化非公共类型'System.Windows.Media.Imaging.BitmapFrameDecode".这将需要进一步调查.不过,我现在必须不管它.
private void SaveXML()
{
TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
FlowDocument flowDocument = richTextBox.Document;
string s = GetImagesXML(flowDocument);//temp
LoadImagesIntoXML(s);
using (StringWriter stringwriter = new StringWriter())
{
using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
{
XamlWriter.Save(flowDocument, writer );//Throws error here
}
}
}
private string GetImagesXML(FlowDocument flowDocument)
{
string s= "";
using (StringWriter stringwriter = new StringWriter())
{
Type inlineType;
InlineUIContainer uic;
System.Windows.Controls.Image replacementImage;
byte[] bytes;
BitmapImage bi;
//loop through replacing images in the flowdoc with the byte versions
foreach (Block b in flowDocument.Blocks)
{
foreach (Inline i in ((Paragraph)b).Inlines)
{
inlineType = i.GetType();
if (inlineType == typeof(Run))
{
//The inline is TEXT!!!
}
else if (inlineType == typeof(InlineUIContainer))
{
//The inline has an object, likely an IMAGE!!!
uic = ((InlineUIContainer)i);
//if it is an image
if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
{
//grab the image
replacementImage = (System.Windows.Controls.Image)uic.Child;
bi = (BitmapImage)replacementImage.Source;
//get its byte array
bytes = GetImageByteArray(bi);
s = Convert.ToBase64String(bytes);//temp
}
}
}
}
return s;
}
}
private byte[] GetImageByteArray(BitmapImage src)
{
MemoryStream stream = new MemoryStream();
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create((BitmapSource)src));
encoder.Save(stream);
stream.Flush();
return stream.ToArray();
}
private void LoadImagesIntoXML(string xml)
{
byte[] imageArr = Convert.FromBase64String(xml);
System.Windows.Controls.Image img = new System.Windows.Controls.Image()
MemoryStream stream = new MemoryStream(imageArr);
BmpBitmapDecoder decoder = new BmpBitmapDecoder(stream, BitmapCreateOptions.None, BitmapCacheOption.Default);
img.Source = decoder.Frames[0];
img.Stretch = Stretch.None;
Paragraph p = new Paragraph();
p.Inlines.Add(img);
richTextBox.Document.Blocks.Add(p);
}
好消息。有一段时间我不得不做其他事情，但这让我带着一双新的眼睛回来。我很快意识到我可以将我所知道的有效方法结合起来。我怀疑这个解决方案是否会赢得任何奖项，但它确实有效。我知道我可以使用 XamlReader 将 FlowDocument 包装为文本，保留图像元素但丢失图像数据。我还知道可以使用 XamlFormat 将 FlowDocument 转换为二进制文件。因此，我有了获取 FlowDocument 的想法，并使用我已经编写的函数来迭代它以查找图像，我获取每个图像，基本上克隆它并将克隆放入新的 FlowDocument 中。我将现在包含单个图像的新 FlowDocument 转换为二进制，然后将生成的二进制文件转换为 Base64 字符串并将其粘贴到原始 FlowDocument 中图像的 tag 属性中。这会将原始 FlowDocument 中的图像数据保留为文本。这样，我可以将带有图像数据（我称之为 SUBString 格式）的 FlowDocument 传递到 XamlReader 中以获取可搜索文本。当它从数据库中出来时，我像平常一样将 FlowDocument 从 Xaml 中拉出，但然后迭代每个图像，使用 XamlFormat 从标记属性中提取数据，然后创建另一个克隆图像以提供我的实际图像的 Source 属性图像。我在下面提供了获取 SUBString 格式的步骤。
/// <summary>
/// Returns a FlowDocument in SearchableText UI Binary (SUB)String format.
/// </summary>
/// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
/// <returns>Returns a string representation of the FlowDocument with images in base64 string in image tag property</returns>
private string ConvertFlowDocumentToSUBStringFormat(FlowDocument flowDocument)
{
//take the flow document and change all of its images into a base64 string
FlowDocument fd = TransformImagesTo64(flowDocument);
//apply the XamlWriter to the newly transformed flowdocument
using (StringWriter stringwriter = new StringWriter())
{
using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(stringwriter))
{
XamlWriter.Save(flowDocument, writer);
}
return stringwriter.ToString();
}
}
/// <summary>
/// Returns a FlowDocument with images in base64 stored in their own tag property
/// </summary>
/// <param name="flowDocument">The FlowDocument containing images/UI formats to be converted</param>
/// <returns>Returns a FlowDocument with images in base 64 string in image tag property</returns>
private FlowDocument TransformImagesTo64(FlowDocument flowDocument)
{
FlowDocument img_flowDocument;
Paragraph img_paragraph;
InlineUIContainer img_inline;
System.Windows.Controls.Image newImage;
Type inlineType;
InlineUIContainer uic;
System.Windows.Controls.Image replacementImage;
//loop through replacing images in the flowdoc with the base64 versions
foreach (Block b in flowDocument.Blocks)
{
//loop through inlines looking for images
foreach (Inline i in ((Paragraph)b).Inlines)
{
inlineType = i.GetType();
/*if (inlineType == typeof(Run))
{
//The inline is TEXT!!! $$$$$ Kept in case needed $$$$$
}
else */if (inlineType == typeof(InlineUIContainer))
{
//The inline has an object, likely an IMAGE!!!
uic = ((InlineUIContainer)i);
//if it is an image
if (uic.Child.GetType() == typeof(System.Windows.Controls.Image))
{
//grab the image
replacementImage = (System.Windows.Controls.Image)uic.Child;
//create a new image to be used to get base64
newImage = new System.Windows.Controls.Image();
//clone the image from the image in the flowdocument
newImage.Source = replacementImage.Source;
//create necessary objects to obtain a flowdocument in XamlFormat to get base 64 from
img_inline = new InlineUIContainer(newImage);
img_paragraph = new Paragraph(img_inline);
img_flowDocument = new FlowDocument(img_paragraph);
//Get the base 64 version of the XamlFormat binary
replacementImage.Tag = TransformImageTo64String(img_flowDocument);
}
}
}
}
return flowDocument;
}
/// <summary>
/// Takes a FlowDocument containing a SINGLE Image, and converts to base 64 using XamlFormat
/// </summary>
/// <param name="flowDocument">The FlowDocument containing a SINGLE Image</param>
/// <returns>Returns base 64 representation of image</returns>
private string TransformImageTo64String(FlowDocument flowDocument)
{
TextRange documentTextRange = new TextRange(flowDocument.ContentStart, flowDocument.ContentEnd);
using (MemoryStream ms = new MemoryStream())
{
documentTextRange.Save(ms, DataFormats.XamlPackage);
ms.Position = 0;
return Convert.ToBase64String(ms.ToArray());
}
}