B4J Question b4j and thread library issue

[behnam_tr]

hi
i have a b4j app and i use threading library (b4a version in b4j)
when i use "mythread.start" method i dont have a problem\
but when i use "mythread.RunOnGuiThread" my app is hang until the operation end.
in this method the sub are runing that load panel and leyout and tableview
this app is telegram bot and have many users
perhaps in onetime many users use the program and run this sub

actually no different between use and not use thread in RunOnGuiThread for me
It still hangs in two case (with thread and without thread)

anyone can help me to solve this problem ??

Dim args(2) As Object
args(0)=from.Id
args(1)=counter1
              
mythread.Priority=mythread.MinPriority
mythread.RunOnGuiThread("snapshot",args)

my sub :

Sub snapshot(uid As Int,counter As Int)
  
    Dim p As Pane
    p.Initialize("")
    p.LoadLayout("hesabdari_printley")
    'p.SetSize(1100dip,900dip)
    p.Visible=False
    MainForm.RootPane.AddNode(p,0,0,1100,900)
  
    lbl_userfullname.Text=bardasht_list.get_fullname(uid)
lbl_datehesabdari.Text=today&" "&DateTime.time(DateTime.Now)
  
    TableView1.SetColumnWidth(0,110)
    TableView1.SetColumnWidth(1,610)
    TableView1.SetColumnWidth(2,110)
    TableView1.SetColumnWidth(3,100)
    TableView1.SetColumnWidth(4,108)
    TableView1.SetColumnWidth(5,50)
    TableView1.SingleCellSelection=False
    TableView1.Items.Clear
  
    asJO(TableView1).RunMethod("setFixedCellSize",Array(40.0))
  
    TableView1.Style="-fx-font-size: 14;-fx-font-family: tahoma;"
    SetColumnStyle(0, "-fx-alignment: CENTER;")
    SetColumnStyle(1, "-fx-alignment: CENTER_right;")
    SetColumnStyle(2, "-fx-alignment: CENTER;")
    SetColumnStyle(3, "-fx-alignment: CENTER;")
    SetColumnStyle(4, "-fx-alignment: CENTER;")
    SetColumnStyle(5, "-fx-alignment: CENTER;")
  
    File.MakeDir(File.DirApp, "/user_reports")
  

    Dim RS As ResultSet=Sql1.ExecQuery2("SELECT * FROM hesabdari OFFSET LIMIT ?,?",Array As String(counter,19))
    Dim ii As Int=counter+1
    Do While RS.NextRow
      
        If RS.GetString("userid")=uid Then
      
            Dim Row(6) As Object
            Row(5)=ii
            Row(4)=RS.GetString("type")
            Row(3)=NumberFormat( RS.GetString("mablagh"),0,0)
            Row(2)=NumberFormat( RS.GetString("mandeh") ,0,0)
            Row(1)=RS.GetString("tozihat")
            Row(0)= unix_to_time(RS.GetString("date"))
      
            TableView1.Items.Add(Row)
            ii=ii+1
                  
        End If
      
    Loop
  
    
    Dim bmp As B4XBitmap = Pane1.Snapshot
    Dim out As OutputStream
    Dim filename As String=uid&Rnd(1,200)&".png"
    out = File.OpenOutput(File.DirApp&"/user_reports", filename, False)
    bmp.WriteToStream(out, 100, "PNG")
    out.Close
    ''''''''''''''''''''''''''''''
    jtb2.sendPhoto(jtb2.byId(uid),jtb2.MediaByFile(File.DirApp&"/user_reports",filename),"test",True,Null,Null)
    '''''''''''''''''''''''''''
    File.Delete(File.DirApp&"/user_reports", filename)
      
End Sub

 

[Erel]

Don't use the Threading library.

The correct solution is to switch to B4XTable.

RunOnGuiThread means that you are running the sub on the main thread. It is better to call it directly. You cannot run that sub on a different thread as only the main thread can access the UI.

 

[behnam_tr]

thanks Erel

in b4xtable for creating snapshot it should be visible =true
but it not needed in tableview
i need the visible = false

i change sub and rewrite sub with b4xtable but It still hangs again
when running this sub the app is not useable and cant do anythings in main form or other forms until compele sub

in this code must p.visible=true else final image is empty

Sub snapshot(uid As Int,counter As Int)

Dim args(1) As Object
args(0)=from.Id
mythread.Priority=mythread.MinPriority
mythread.Start(Me,"send_supp_info",args)



       Dim p As Pane
    p.Initialize("")
    p.LoadLayout("hesabdari_printley")
        p.Visible=False
    MainForm.RootPane.AddNode(p,0,0,1100,900)
    
    lbl_userfullname.Text=bardasht_list.get_fullname(uid)
    lbl_datehesabdari.Text=today&"  "&DateTime.time(DateTime.Now)
    
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("تاریخ",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 110
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("توضیحات",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 600
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("مانده حساب",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 110
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("مبلغ",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 100
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("نوع",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 108
    Dim StateColumn As B4XTableColumn=B4XTable1.AddColumn("ردیف",B4XTable1.COLUMN_TYPE_TEXT)
    StateColumn.Width = 50
    
    B4XTable1.RowHeight=37
    

    
    File.MakeDir(File.DirApp, "/user_reports")
    
    Dim data As List
    data.Initialize
    
'    Dim RS As ResultSet=Sql1.ExecQuery2("SELECT * FROM hesabdari WHERE userid = ? ", Array As Int(uid))
    Dim RS As ResultSet=Sql1.ExecQuery2("SELECT * FROM hesabdari OFFSET LIMIT ?,?",Array As String(counter,19))
    Dim ii As Int=counter+1
    Do While RS.NextRow
        
        If RS.GetString("userid")=uid Then
        
        Dim Row(6) As Object
        Row(5)=ii
        Row(4)=RS.GetString("type")
        Row(3)=NumberFormat( RS.GetString("mablagh"),0,0)
        Row(2)=NumberFormat( RS.GetString("mandeh") ,0,0)
        Row(1)=RS.GetString("tozihat")
        Row(0)= unix_to_time(RS.GetString("date"))
        
            
        data.Add(Array(Row(0), Row(1), Row(2),Row(3),Row(4),Row(5)))
            
        ii=ii+1
                    
        End If
        
    Loop
    B4XTable1.SetData(data)
    Sleep(500)
      
        Dim bmp As B4XBitmap = Pane1.Snapshot
        Dim out As OutputStream
        Dim filename As String=uid&Rnd(1,20)&".png"
        out = File.OpenOutput(File.DirApp&"/user_reports", filename, False)
        bmp.WriteToStream(out, 100, "PNG")
        out.Close

End sub

 

[Erel]

1. I write my answer again:

Don't use the Threading library.

2. You should never load layouts to zero sized panels.