B4J Question B4XTable Crashes with 8 Columns But Not With 7

[cklester]

If you run the attached B4XPages project, the app will crash when you attempt to search the B4XTable.

If you comment out line 30, reducing the table column count from 8 to 7, you can search just fine. No problem.

I also tried with 9 and 999 rows. The number of rows does not seem to matter.

 

[emexes]

You've probably already tried this but, in the programming fog-of-war, sometimes things slip by ? :

is it possible, when you set the table to 8 columns, that B4XTable1.SetData is expecting newrow()s of 8 strings, not 7 ?

Private newrow(7) As String
...
B4XTable1.SetData(randList)

 

[cklester]

is it possible, when you set the table to 8 columns, that B4XTable1.SetData is expecting newrow()s of 8 strings, not 7 ?

Private newrow(7) As String
...
B4XTable1.SetData(randList)

It's seemingly irrelevant, as both are receiving only newrows() of 4 strings.

In both cases, I am passing fewer-than-expected columns of data. Only the table with 8 columns crashes.

 

[LucaMs]

Only the table with 8 columns crashes.

It is not so. The size of the array must match the number of columns.

Try so, commenting/uncommenting some AddColumn lines.

    Private randList As List
    randList.Initialize
    Private i As Int
    For i = 0 To 99
        Private newrow(B4XTable1.Columns.Size) As String
        Private x As Int
        For x = 0 To B4XTable1.Columns.Size - 1
            newrow(x) = RandomString(3)
        Next
        randList.Add(newrow)
    Next

    B4XTable1.SetData(randList)

 

[emexes]

Only the table with 8 columns crashes.

Try 8 table columns with:

Private newrow(8) As String

 

[cklester]

The size of the array must match the number of columns.

If this were true, why does the table with 7 columns not crash?

Answer: Given @emexes answer above, it seems it is the size of the array with SetData() that matters. I didn't notice that before.

 

[cklester]

Try 8 table columns with:

Private newrow(8) As String

Ah! That must be it.

As long as the array is of sufficient size, it doesn't matter what you put into it.

Thank you!

 

[cklester]

I wonder, then, if an error message should be produced when trying to use SetData() with a list of arrays that aren't enough.