BIRT的HTMLRenderReport向嵌入的图像中添加了一个类似于file://的url(而不是将其嵌入到HTML中) [英] HTMLRenderReport of BIRT adds a `file://`-like url to embedded images (instead of embedding them into the HTML)

问题描述

我有一个BIRT报告，其主页上有一个图像.

I have a BIRT report with an image in the master page.

我在报告中嵌入了png，并在body标记后生成了以下XML:

I embedded a png inside the report and it generated the following XML after the body tag:

  <list-property name="images">
      <structure>
          <property name="name">filename.png</property>
          <property name="type">image/png</property>
          <property name="data">
            BASE64 of the image
          </property>
      </structure>
   </list-property>

然后，我将其包含在母版页中，并添加以下元素:

Then, I have included it into the master page, adding this element:

    <image id="828">
       <property name="source">embed</property>
       <property name="imageName">filename.png</property>
    </image>

我的BIRT设计文件的行为:

然后，如果我从BIRT设计器运行预览，则HTML和PDF输出都可以很好地工作.如果我使用IPDFRenderOption渲染(来自我的软件)，它将生成正确的pdf罚款. 但是，如果我使用HTMLRenderOption，则图像不会嵌入到HTML报告中，而是使用类似以下内容的图像呈现:

Behaviours of my BIRT design file:

Then, If I run the preview from the BIRT designer it works great with both HTML and PDF output. If I render it using IPDFRenderOption (from my software) it generates the correct pdf fine. But if I use HTMLRenderOption, then the image is not embeded into the HTML report, but it is rendered with something like:

 <img src="file:/.../apache-tomcat-7.0.35/design11.png">

我期望的是

虽然我期望像这样:

What I expect:

While I expected something like:

 <img src="data:image/png;base64,BASE64 STUFF THAT I PUT IN THE LIST-PROPERTIES ">

那么，当用HTMLRenderOption执行时，如何让BIRT将图像嵌入到HTML文件中，而不是创建指向该文件的链接?

So, how can I let BIRT, when executed with HTMLRenderOption, to embed my image into the HTML file instead of creating a link to it?

推荐答案

我通过向报表的主页添加两个不同的图像来解决了这个问题:

I solved this by adding two different images to the masterpage of the report:

由于PDF的渲染效果很好，所以我将图像保留为在问题中所写的位置，并在HTML输出中设置了该图像的可见性

Since the PDF is well rendered, I leaved the image as I wrote in the question, and I set off the visibility of this image in the HTML output

然后，在母版页中，添加了一个新图像.这次我没有将其设置为嵌入式.相反，我将其设置为由URI引用.作为URI，我在HTML输出中设置了所需的base64 URI.基本上，我在报告的XML中添加了以下图像:

Then, in the master page, I added a new image. This time I haven't set it as embedded. Instead I set it as referenced by an URI. As URI I set the base64 URI that I need in my HTML output. Basically, I added to the XML of the report the following image:

<image id="1972">
    <list-property name="visibility">
        <structure>
            <property name="format">pdf</property>
            <expression name="valueExpr" type="javascript">true</expression>
        </structure>
    </list-property>
        <property name="source">url</property>
        <expression name="uri" type="constant">data:image/png;base64, BASE 64 OF MY PNG IMAGE</expression>
 </image>

然后我将图像设置为仅对HTML输出可见.

I then set the image to be visibile only for the HTML output.

以这种方式BIRT渲染一个img标签，其中包含我放置在XML中的URL，无论它是什么.因此，将data:image/png;base64, BASE 64 OF MY PNG IMAGE放置为url.从而将图像嵌入到HTML输出中.

In this way BIRT renders an img tag with the URL i put in the XML, whatever it is. And thus, it puts the data:image/png;base64, BASE 64 OF MY PNG IMAGE as url. And thus it embeds the image in the HTML output.

BIRT支持blob字段中的图像，并且可以将其添加到报告中.要查看操作方法，请参见:

BIRT supports the images inside blob fiels, and can manage in adding them to your report. To see how, see there: http://help.eclipse.org/helios/index.jsp?topic=%2Forg.eclipse.birt.doc%2Fbirt%2Flayout.5.7.html

如果它不起作用，您可以管理在url上插入动态值，而无需编辑脚本(但是当然要使用一点Javascript来确定哪一列包含了图像数据).

If it does not works, you can manage inserting a dynamic value on your url, still without editing the scripts (but of course using a bit of Javascript to decide which column contains the data of teh image).

下面是从列中读取base64值的图像的XML代码:

Here below the XML code of an image that reads the base64 value from a column:

  <image id="1974">
        <property name="source">url</property>
        <expression name="uri" type="javascript">"data:image/png;base64,"+row["BASE_64_PNG_COLUMN"]     </expression>
  </image>

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