Tilesoft
Member
Hi,
My app must Download a file > then read it (a number) > then (number+1=result) > write result to same file.
But i get some errors. My code is:
And errors:
My app must Download a file > then read it (a number) > then (number+1=result) > write result to same file.
But i get some errors. My code is:
B4X:
Sub Globals
Dim NumberVar As Int
Dim NumberMath As Int
End Sub
Sub Button1_Click
Dim j As HttpJob 'redim and initialize
j.Initialize("", Me)
j.Download("https://x.ir/number.txt")
Wait For (j) JobDone(j As HttpJob)
If j.Success Then
Dim out1 As OutputStream = File.OpenOutput(File.DirInternal, "number.txt", False)
File.Copy2(j.GetInputStream, out1)
out1.Close '<------ very important
If File.Exists(File.DirInternal, "number.txt") = True Then
Log("yes")
NumberVar=File.ReadString(File.DirInternal, "number.txt")
Log(NumberVar)
NumberMath=NumberVar+1
File.WriteString(File.DirInternal, "number.txt", NumberMath)
Log(NumberMath)
End If
'StartActivity(Post_Publish)
End If
j.Release
End SubAnd errors:
B4X:
number_download$ResumableSub_Button1_Clickresume (java line: 450)
java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at lila.project.number_download$ResumableSub_Button1_Click.resume(number_download.java:450)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:267)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:207)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1178)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7561)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:995)