AllAccepted answers
Eduard Lebedyuk · Jul 6, 2020

It might sufficient to put your code just into a CODE Block of a BP generated with the wizard.

If you need to execute raw ObjectScript from BPL add assign activity and set status variable to the value of your classmethod. No need to add a code block.

Still, BP without BPL are quite easy to implement, here's the guide.

Eduard Lebedyuk · Jul 2, 2020

What's your file I/O default?

zn "%SYS"
do ^NLS
Choose 4) Display loaded settings
Choose 3) Display system defaults for I/O tables

Here's what I got:

-------------- System defaults for I/O tables --------------
 
Table               Name
-----------------   ---------------
Process             RAW
Cache Terminal      UTF8
Other terminal      UTF8
File                UTF8
Magtape             UTF8
TCP/IP              RAW
System call         RAW
Printer             CP1251
Eduard Lebedyuk · Jun 29, 2020

Get property parameter by global access:

/// Get property param
/// w ##class().GetPropertyParam("Form.Test.Simple", "Name", "MAXLEN")
ClassMethod GetPropertyParam(class As %Dictionary.CacheClassname = "", property As %String = "", param As %String = "") As %String [ CodeMode = expression ]
{
$$$comMemberArrayGet(class, $$$cCLASSproperty, property, $$$cPROPparameter, param)
}
Eduard Lebedyuk · Jun 28, 2020

If it's a File Stream you can set TranslateTable property to your charset before reading.

Otherwise you can use $zcvt function to convert strings.

Here's an example of iterating encodings for $zcvt to determine a correct encoding.

If you are interested in encoding internals use zzdump to check hexdumps.

If your encoding is region specific don't forget to set your locale.

Eduard Lebedyuk · Jun 28, 2020

Persistent classes:

SELECT Name
FROM %Dictionary.ClassDefinition_SubclassOf('%Persistent')

List properties and relationships (if you need subset - filter by parent - it's a class):

SELECT
parent,  Name, Cardinality, Collection, Id, _Identity,  Relationship, Type
FROM %Dictionary.CompiledProperty

Foreign keys:

SELECT
parent, Name, Properties, ReferencedClass, ReferencedKey
FROM %Dictionary.ForeignKeyDefinition

For everything %Dictionary.Compiled* - includes defined and inherited values, Definitions include only items defined in a current class.