Displaying an image created at runtime.

Question

I am creating an image at run time (a bar code). How do I display this?
To test a static image I placed the bar code image in the src/mimes/components/packages directory, then compiled that application and it worked perfectly.
I then created the bar code image at run time and wrote it to the same src/mimes/components/packages directory as above. The file was succesfully placed there, but the application does not display the image. If the application is then recompiled with a a hard coded value of the previous bar code in the getImageImageSource method it works.
I'm guessing that the run time repository for images is different to the design time one; is this is the case where should I be writing the image file and what should I return from the getImageImageSource method?
Nigel

Answer 1

Hallo Nigel,
you can apply the Web Dynpro Binary Cache. Just store URL of the cached resource within a context attribute and bind the image url to this attribute.
Implement the following coding:
//@@begin javadoc:wdDoInit()
  /** Hook method called to initialize controller. */
  //@@end
  public void wdDoInit()
    //@@begin wdDoInit()
    wdContext.currentContextElement().setImgVisibility(WDVisibility.NONE);
    // Modify datatype, propare datatype for modifications done by the runtime
    wdContext.getNodeInfo().getAttribute("File").getModifiableSimpleType();
    //@@end
  //@@begin javadoc:onActionUpload(ServerEvent)
  /** Declared validating event handler. */
  //@@end
  public void onActionUpload(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionUpload(ServerEvent)
    IWDCachedWebResource cachedResource = null;
    String imgUrl = null;
    WDWebResourceType type =
      ((IWDModifiableBinaryType) wdContext.getNodeInfo().getAttribute("File").getModifiableSimpleType())
        .getMimeType();
    byte[] file = wdContext.currentContextElement().getFile();
    if (file != null) {
      cachedResource = WDWebResource.getWebResource(file, type);
      try {
        imgUrl = cachedResource.getURL();
        wdContext.currentContextElement().setUrl(imgUrl);
        wdContext.currentContextElement().setImgVisibility(WDVisibility.VISIBLE);
      } catch (WDURLException e) {
        wdComponentAPI.getMessageManager().reportException(e.getLocalizedMessage(), true);
    //@@end
Regards, Bertram