我有一个richtextbox，我计划保存到数据库，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的想法，与文本分开？
提前致谢！
GetImageByteArray（）就是问题所在。
代码：
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;
}
更新
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。我现在不得不暂时不管它。
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);
}
答案 0 :(得分：3)
好消息。我不得不在其他地方工作一段时间，但这让我带着一双新鲜的眼睛回来。我很快意识到我可以把我知道的工作结合起来。我怀疑这个解决方案会赢得任何奖项，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。我也知道我可以使用XamlFormat将FlowDocument转换为二进制文件。所以我有了获取FlowDocument的想法，并使用我已编写的函数来迭代查找图像，我拍摄每个图像，基本上克隆它并将克隆放入新的FlowDocument中。我采用现在包含单个图像的新FlowDocument，将其转换为二进制，然后获取生成的二进制文件，将其转换为base64字符串并将其粘贴到原始FlowDocument中的图像的tag属性中。这会将原始FlowDocument中的图像数据保存为文本。这样我就可以将带有图像数据的FlowDocument（我称之为SUBString Format）传递到XamlReader中以获取可搜索的文本。当它从数据库出来时，我正常地将FlowDocument拉出Xaml，但随后遍历每个图像，使用XamlFormat从tag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的Source属性图片。我已经提供了下面的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());
}
}
答案 1 :(得分：0)
将图像保存到MemoryStream并将该流写入XML文件。
内存流将其转换为字节[]。
答案 2 :(得分：0)
以下是我已经提出的两个建议的示例代码，如果我的示例不起作用，则必须查看有效负载问题...
// get raw bytes from BitmapImage using BaseUri and SourceUri
private byte[] GetImageByteArray(BitmapImage bi)
{
byte[] result = new byte[0];
string strImagePath = Path.Combine(Path.GetDirectoryName(bi.BaseUri.OriginalString), bi.UriSource.OriginalString);
byte[] fileBuffer;
using (FileStream fileStream = new FileStream(strImagePath, FileMode.Open))
{
fileBuffer = new byte[fileStream.Length];
fileStream.Write(fileBuffer, 0, (int)fileStream.Length);
}
using (MemoryStream ms = new MemoryStream(fileBuffer))
{
XamlWriter.Save(bi, ms);
//result = new byte[ms.Length];
result = ms.ToArray();
}
return result;
}
// get raw bytes from BitmapImage using BitmapImage.CopyPixels
private byte[] GetImageByteArray(BitmapSource bi)
{
int rawStride = (bi.PixelWidth * bi.Format.BitsPerPixel + 7) / 8;
byte[] result = new byte[rawStride * bi.PixelHeight];
bi.CopyPixels(result, rawStride, 0);
return result;
}
private BitmapSource GetImageFromByteArray(byte[] pixelInfo, int height, int width)
{
PixelFormat pf = PixelFormats.Bgr32;
int stride = (width * pf.BitsPerPixel + 7) / 8;
BitmapSource image = BitmapSource.Create(width, height, 96, 96, pf, null, pixelInfo, stride);
return image;
}