B4J Question OKHttputils has a FileNotFoundException

xulihang · May 30, 2022

I never encounter this error on my computer, but my users frequently report this to me. I cannot figure out the reason.

This happens when the app makes an HTTP request continuously (>2 times per second, sample code). Does this has anything to do with OKHttpUtils?

B4X:

error: java.io.FileNotFoundException: C:\Users\zero4\AppData\Local\Temp\14 (Access denied 拒绝访问。)
StackTrace: java.io.FileNotFoundException: C:\Users\zero4\AppData\Local\Temp\14 (�ܾ����ʡ�)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(Unknown Source)
at java.io.FileOutputStream.(Unknown Source)
at anywheresoftware.b4a.objects.streams.File.OpenOutput(File.java:439)
at org.xulihang.imagetrans.httputils2service._hc_responsesuccess(httputils2service.java:110)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
at anywheresoftware.b4a.BA$3.run(BA.java:247)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)

xulihang · May 30, 2022

libraries used.

xulihang · May 30, 2022

About this line in the OKHttpUtils's httputils2service class:

B4X:

Dim out As OutputStream = File.OpenOutput(TempFolder, TaskId, False)

Maybe there is a file with the same name but deleted by other programs.

aeric · May 30, 2022

xulihang said:
About this line:

B4X:

Dim out As OutputStream = File.OpenOutput(TempFolder, TaskId, False)

Maybe there is a file with the same name but deleted by other programs.

Maybe

behnam_tr · May 30, 2022

Permission denied

change file path and test again

xulihang · May 30, 2022

behnam_tr said:
change file path and test again

I can't test it. This only happens on my users' computer.

DonManfred · May 30, 2022

Upload a small project showing the problem.

behnam_tr · May 30, 2022

xulihang said:
I can't test it. This only happens on my users' computer.

I think the user is restricted and does not have permission to write to the desired folder.

xulihang · May 30, 2022

DonManfred said:
Upload a small project showing the problem.

Just making http requests about 2 times / second.

xulihang · May 30, 2022

behnam_tr said:
I think the user is restricted and does not have permission to write to the desired folder.

I don't think he does not have permissions to this Temp folder. In fact, sometimes the http request can be made, but when it runs batch requests (> 2 times per second), this error will happen.

Erel · May 30, 2022

Are you checking that Job.Success is true and aren't releasing the HttpJob prematurely?

xulihang · May 30, 2022

Erel said:
Are you checking that Job.Success is true and aren't releasing the HttpJob prematurely?

Here is the code:

B4X:

Sub Translate
    For i = 0 To 100
        Sleep(200)
        Wait For (MyMemory("Test text","en","zh")) Complete (result As String)
        Log(result)
    Next
End Sub

Sub MyMemory(source As String,sourceLang As String,targetLang As String) As ResumableSub
    Dim email As String = "test@163.com"
    Dim su As StringUtils
    source=su.EncodeUrl(source,"UTF-8")
    Dim job As HttpJob
    job.Initialize("job",Me)
    Dim langpair As String
    langpair=sourceLang&"|"&targetLang
    langpair=su.EncodeUrl(langpair,"UTF-8")
    Dim param As String
    param="?q="&source&"&langpair="&langpair
    If email<>"" Then
        param=param&"&de="&email
    End If
   
    job.Download("https://api.mymemory.translated.net/get"&param)
    Dim translatedText As String=""
    wait for (job) JobDone(job As HttpJob)
    If job.Success Then
        Try
            Log(job.GetString)
            Dim json As JSONParser
            json.Initialize(job.GetString)
            Dim response As Map
            response=json.NextObject.Get("responseData")
            translatedText=response.Get("translatedText")
        Catch
            Log(LastException)
        End Try
    End If
    job.Release
    Return translatedText
End Sub

DonManfred · May 30, 2022

xulihang said:
Here is the code

there is no Outputstream used in this code? It is different than the code you posted earlier in #3

xulihang · May 30, 2022

DonManfred said:
there is no Outputstream used in this code? It is different than the code you posted earlier in #3

That line is in the OKHttpUtils.

MarcoRome · May 30, 2022

What version of okhttputils2 are you using ?
Why don't you use okhttputils2 as a library ?

xulihang · May 30, 2022

MarcoRome said:
What version of okhttputils2 are you using ?
Why don't you use okhttputils2 as a library ?

Version 2.9.5 as in the screenshot I posted at #2. I use it as a library. I am just looking at the code to figure out which line causes the problem.

Erel · May 30, 2022

My guess is that another process locks the file. Might be an anti-virus software.

You can change the TempFolder and see if it makes any difference.

B4X:

HttpUtils2Service.Service_Create
 HttpUtils2Service.TempFolder = xui.DefaultFolder

Magma · May 30, 2022

Erel said:
My guess is that another process locks the file. Might be an anti-virus software.

You can change the TempFolder and see if it makes any difference.

B4X:

HttpUtils2Service.Service_Create HttpUtils2Service.TempFolder = xui.DefaultFolder

Is that possible to do it everytime you need to download ? ? (change temp folder)

xulihang · May 30, 2022

Erel said:
My guess is that another process locks the file. Might be an anti-virus software.

You can change the TempFolder and see if it makes any difference.

B4X:

HttpUtils2Service.Service_Create HttpUtils2Service.TempFolder = xui.DefaultFolder

Thanks. I will let them have a try.

Erel · May 30, 2022

Magma said:
Is that possible to do it everytime you need to download ? ? (change temp folder)

No. Do it once when the app starts. OkHttpUtils2 works asynchronously so it is not simple to change it later.

B4J Question OKHttputils has a FileNotFoundException

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