Hi All,

After converting a MT4 indicator, I get 2 errors which I can't figure out :

10:44:31 Error in indicator: java.lang.NullPointerException @ jforex.converted.Chart_Infos.start(Chart_Infos.java:98)

10:44:31 WARNING: selected Instrument is null, take: EURUSD

If someone can help me to solve these errors.

Thank you very much.
Eric

Please provide the indicator mq4 file.

Here is attached.

Thank you.

Launch the script as a strategy, not an indicator, because there is no trading data available from an indicator. For launch instructions see "Convert a strategy" section in the description topic viewtopic.php?f=16&t=47063

Thank you.

Will look at this and will let you know.

When I open it as a strategy, it gives error at compile :

13:41:57 public class Chart_Infos extends MQL4ConnectorIndicator {
13:41:57 ^^^^^^^^^^^
13:41:57 The public type Chart_Infos must be defined in its own file
13:41:57 ----------

Thank you for your support.

Please delete the .java and .jfx files and repeat the conversion.

Compiled fine. Thank you.

Once applied, the display on chart doesn't respect the proper corner, color, font size ... etc ... of the original mq4 coding. Is that due to a convertion issue ?

It's because there is no such Label object in JForex-API which can be plotted in a relative distance from a chart corner. Therefore the visualization that you see is a workaround, which makes use of the chart comment.

So why if I apply the mq4 converted in an indicator, the display (the part with no error) respect perfectly the original mq4 display ?

Because an indicator has a direct access to chart, whilst strategies can create their objects only through determined API methods (i.e. IChartObjectFactory).

Ok. Thank you.

Will try to manage this ...

I'm back on this answer. Does that mean that there's no way to create an object (for strategy) with settable Font, FontSize, Corner, etc ... ?

I didn't figure out how to do. If this is possible, it would be great to have just an example of code for an object with defined Font, FontSize, Corner, etc ... Or even just a link in the forum pointing to a strategy already coded with objects plotted on chart.

Thank you again for your support.

From strategy one can plot only objects in time-price coordinate system (also with font, font size properties); a single comment (see IChart methods setComment, setCommentFont, setCommentHorizontalPosition, setCommentVerticalPosition); ohlc object, one can't, however, plot a label in a certain pixel distance from a corner.
See the text object:
https://www.dukascopy.com/wiki/#Chart_object_catalog/Text
You can try out plotting the comment within the template:
https://www.dukascopy.com/wiki/#Chart_object_catalog

Thank you.