I want to save small images in my room database and I have two issues:
How do I save an image in my database?
How do I save multiple images in my database?
I tried saving a bitmap in the way recommended by the developers page (https://developer.android.com/training/data-storage/room/defining-data)
#Parcelize
#Entity(tableName = "image_table")
data class ImgMod(
#PrimaryKey(autoGenerate = true)
var invoiceId: Long = 0L,
#ColumnInfo(name = "image")
var single_img: Bitmap?
): Parcelable
However, I receive the following error:
Cannot figure out how to save this field into database. You can consider adding a type converter for it.
Secondly, I would like to save multiple images in one database entry. But I receive the same error with the following snippets:
#ColumnInfo(name = "imageList")
var img_list: ArrayList<BitMap>
or decoded bitmap as a String
#ColumnInfo(name = "imageList")
var decoded_img_list: ArrayList<String>
I am sorry if this is a very basic question. But how do I have to configure the database/process the data to an image list?
Thank you in advance,
rot8
A very simple way to get images into the database (although I personally discourage it) would be to base-64 encode the bitmaps into a String and put it into a row of the database.
Take in account that bitmaps are very memory heavy; and base64 encoding something increases it's size some more so be careful when loading a bunch of images... I do also think Room and SQLite supports binary data as blobs, so you could just declare a column as ByteArray and it should just work.
What I've been doing in my projects is to write them into the internal or external storage of my app and then store the reference Uri as a String to later be able to retrieve the image from disk.
Something that I discourage even more is to stuff more than one value per row; having a list of stuff inside a coulmn in SQL is definetely not a pattern you should follow. Creating a "join" table should be simple enough or simply an extra column you could use to group them by should be easy enough, right?
How can I convert a string to RTF format read from the database?
When read, in the richedit appears the string with tag : /par {ansistring.......
I tried using this code but the result is the same.
rtfString:= set1.fieldbyname('corpo_rtf').asansistring;
stream := TMemoryStream.Create;
stream.Clear;
stream.Write(PAnsiChar(rtfString)^, Length(rtfString));
stream.Position := 0;
corpo.PlainText := False;
corpo.Lines.LoadFromStream(stream);
stream.Free;
Your code works fine if the content of the memory stream is valid RTF. Ergo, that cannot be the case.
You need to dig deeper into the actual content of the memory stream. Write it out to a text file with .rtf extension. Try to load it with Wordpad. See what happens. You should see the same as your Delphi application displays.
So, where could this be going wrong? Some possible causes include:
The data in the database is not valid RTF.
There are some undesired text conversions being performed. We assume that rtfString is of type AnsiString. Is it?
For whatever reason the data I am getting from database is coming in this format: " 830AM"
Also notice that extra space before number 8
I need to format it to show as "08:30 AM" in Silverlight XAML or Styles.
How would we do that?
If you're sure that the incoming format is always the same, you could use DateTime.ParseExact to get the DateTime object -- then convert it back to a string with the format you want.
string timeStr = " 830AM";
string format = "h:mmtt";
DateTime time = DateTime.ParseExact(timeStr.Trim(), format, CultureInfo.InvariantCulture);
string timeStrFormatted = time.ToString("hh:mm tt", CultureInfo.InvariantCulture);
To do this in Silverlight XAML, you could use an IValueConverter in the binding. Better still, use a read-only property on the view-model, which performs the above conversion.
I'm trying out the EF 4.0 and using the Model first approach. I'd like to store images into the database and I'm not sure of the best type for the scalar in the entity.
I currently have it(the image scalar type) setup as a binary. From what I have been reading the best way to store the image in the db is a byte[]. So I'm assuming that binary is the way to go. If there is a better way I'd switch.
In my controller I have:
//file from client to store in the db
HttpPostedFileBase file = Request.Files[inputTagName];
if (file.ContentLength > 0)
{
keyToAdd.Image = new byte[file.ContentLength];
file.InputStream.Write(keyToAdd.Image, 0, file.ContentLength);
}
This builds fine but when I run it I get an exception writing the stream to keyToAdd.Image.
The exception is something like: Method does not exist.
Any ideas?
Note that when using a EF 4.0 model first approach I only have int16, int32, double, string, decimal, binary, byte, DateTime, Double, Single, and SByte as available types.
Thanks
Instead of using Write I should have been using Read. I'm still interested if there is a better way to store the image stream.
It was file.InputStream.Write(tmpBytes, 0, file.ContentLength);
byte[] tmpBytes = new byte[file.ContentLength];
file.InputStream.Read(tmpBytes, 0, file.ContentLength);
keyToAdd.Image = tmpBytes;
I'm working on a data migration task, where I have to export a somewhat large Lotus Notes application into a blogging platform. My first task was to export the articles from Lotus Notes into CSV files.
I created a Agent in LotusScript to export the data into CSV files. I use a modified version of this IBM DeveloperWorks forum post. And it basically does the job. But the contents of the Rich Text field is stripped of any formatting. And this is not what I want, I want the Rich Text field rendered as HTML.
The documentation for the GetItemValue method explicitly states that the text is rendered into plain text. So I began to research for something that would retrieve the HTML. I found the NotesMIMEEntity class and some sample code in the IBM article How To Access HTML in a Rich Text Field Using LotusScript.
But for the technique described in the above article to work, the Rich Text field need to have the property "Store Contents as HTML and MIME". And this is not the case with my Lotus Notes database. I tried to set the property on the fields in question, but it didn't do the trick.
Is it possible to use the NotesMIMEEntity and set the "Store Contents as HTML and MIME" property after the content has been added, to export the field rendered as HTML?
Or what are my options for exporting the Notes database Rich Text fields as HTML?
Bonus information: I'm using IBM Lotus Domino Designer version 8.5
There is this fairly unknown command that does exactly what you want: retrieve the URL using the command OpenField.
Example that converts only the Body-field:
http://SERVER/your%5Fdatabase%5Fpath.nsf/NEW%5FVIEW/docid/Body?OpenField
Here is how I did it, using the OpenField command, see D.Bugger's post above
Function GetHtmlFromField(doc As NotesDocument, fieldname As String) As String
Dim obj
Set obj = CreateObject("Microsoft.XMLHTTP")
obj.open "GET", "http://www.mydomain.dk/database.nsf/0/" + doc.Universalid + "/" + fieldname + "?openfield&charset=utf-8", False, "", ""
obj.send("")
Dim html As String
html = Trim$(obj.responseText)
GetHtmlFromField = html
End Function
I'd suggest looking at Midas' Rich Text LSX (http://www.geniisoft.com/showcase.nsf/MidasLSX)
I haven't used the personally, but I remember them from years ago being the best option for working with Rich Text. I'd bet it saves you a lot of headaches.
As for the NotesMIMEEntity class, I don't believe there is a way to convert RichText to MIME, only MIME to RichText (or retain the MIME within the document for emailing purposes).
If you upgrade to Notes Domino 8.5.1 then you can use the new ConvertToMIME method of the NotesDocument class. See the docs. This should do what you want.
Alternativly the easiest way to get the Domino server to render the RichText will be to actually retrieve it via a url call. Set up a simple form that just has the RichText field and then use your favourite HTTP api to pull in the page. It should then be pretty straight forward to pull out the body.
Keep it simple.
Change the BODY field to Store contents as HTML and MIME
Open the doc in editmode.
Save.
Close.
You can now use the NotesMIMEEntity to get what you need from script.
You can use the NotesDXLExporter class to export the Rich Text and use an XSLT to transform the output to what you need.
I know you mentioned using LotusScript, but if you don't mind writing a small Java agent (in the Notes client), this can be done fairly easily - and there is no need to modify the existing form design.
The basic idea is to have your Java code open a particular document through a localhost http request (which is simple in Java) and to have your code capture that html output and save it back to that document. You basically allow the Domino rendering engine to do the heavy lifting.
You would want do this:
Create a form which contains only the rich-text field you want to convert, and with Content Type of HTML
Create a view with a selection formula for all of the documents you want to convert, and with a form formula which computes to the new form
Create the Java agent which just walks your view, and for each document gets its docid, opens a URL in the form http://SERVER/your_database_path.nsf/NEW_VIEW/docid?openDocument, grabs the http response and saves it.
I put up some sample code in a similar SO post here:
How to convert text and rich text fields in a document to html using lotusscript?
Works in Domino 10 (have not tested with 9)
HTMLStrings$ = NotesRichTextItem .Converttohtml([options] ) As String
See documentation :
https://help.hcltechsw.com/dom_designer/10.0.1/basic/H_CONVERTOHTML_METHOD_NOTESRICHTEXTITEM.html
UPDATE (2022)
HCL no longer support this method since version 11. The documentation does not include any info about the method.
I have made some tests and it still works in v12 but HCL recommended to not use it.
Casper's recommendation above works well, but make sure the ACL is such to allow Anonymous Access otherwise your HTML will be the HTML from your login form
If you do not need to get the Richtext from the items specifically, you can use ?OpenDocument, which is documented (at least) here: https://www.ibm.com/developerworks/lotus/library/ls-Domino_URL_cheat_sheet/
https://www.ibm.com/support/knowledgecenter/SSVRGU_9.0.1/com.ibm.designer.domino.main.doc/H_ABOUT_URL_COMMANDS_FOR_OPENING_DOCUMENTS_BY_KEY.html
OpenDocument also allows you to expand sections (I am unsure if OpenField does)
Syntax is:
http://Host/Database/View/DocumentUniversalID?OpenDocument
But be sure to include the charset parameter as well - Japanese documents were unreadable without specifying utf-8 as the charset.
Here is the method I use that takes a NotesDocument and returns the HTML for the doc as a string.
private string ConvertDocumentToHml(Domino.NotesDocument doc, string sectionList = null)
{
var server = doc.ParentDatabase.Server.Split('/')[0];
var dbPath = doc.ParentDatabase.FilePath;
string viewName = "0";
string documentId = doc.UniversalID.ToUpper();
var ub = new UriBuilder();
ub.Host = server;
ub.Path = dbPath.Replace("\\", "/") + "/" + viewName + "/" + documentId;
if (string.IsNullOrEmpty(sectionList))
{
ub.Query = "OpenDocument&charset=utf-8";
}
else
{
ub.Query = "OpenDocument&charset=utf-8&ExpandSection=" + sectionList;
}
var url = ub.ToString();
var req = HttpWebRequest.CreateHttp(url);
try
{
var resp = req.GetResponse();
string respText = null;
using (var sr = new StreamReader(resp.GetResponseStream()))
{
respText = sr.ReadToEnd();
}
return respText;
}
catch (WebException ex)
{
return "";
}
}