Android Question http post and parse xml info

grant1842

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I need to make a post to
http://xmldata.qrz.com/xml/current/?username=xx1xxx;password=abcdef;
the result will be in xml
B4X:
<QRZDatabase xmlns="http://xmldata.qrz.com" version="1.33">
<Session>
<Key>640ff538f6f1bd3490614f0f9c7e6e01</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Wed Apr 22 23:24:17 2015</GMTime>
<Remark>cpu: 0.024s</Remark>
</Session>
</QRZDatabase>

I need to get the Key and use it to make a different request.
I am useing HttpUtils2.
Here is the code i have started.
I am trying to figure out how to post to the url and get the key from the xml.


B4X:
Dim getsessionkey As HttpJob
Dim key As String
    getsessionkey.Initialize("getsession","Me")
    getsessionkey.PostString("http://xmldata.qrz.com/xml/current/?username=someuser;password=somepassword;agent=gdf.0","key")
    'key = get key from xml response from post
Thanks for your help.
 

walterf25

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I need to make a post to
http://xmldata.qrz.com/xml/current/?username=xx1xxx;password=abcdef;
the result will be in xml
B4X:
<QRZDatabase xmlns="http://xmldata.qrz.com" version="1.33">
<Session>
<Key>640ff538f6f1bd3490614f0f9c7e6e01</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Wed Apr 22 23:24:17 2015</GMTime>
<Remark>cpu: 0.024s</Remark>
</Session>
</QRZDatabase>

I need to get the Key and use it to make a different request.
I am useing HttpUtils2.
Here is the code i have started.
I am trying to figure out how to post to the url and get the key from the xml.


B4X:
Dim getsessionkey As HttpJob
Dim key As String
    getsessionkey.Initialize("getsession","Me")
    getsessionkey.PostString("http://xmldata.qrz.com/xml/current/?username=someuser;password=somepassword;agent=gdf.0","key")
    'key = get key from xml response from post
Thanks for your help.
You can use the xml parser library, take a look at the tutorial here: https://www.b4x.com/android/forum/threads/xml-parsing-with-the-xmlsax-library.6866/#content

Good luck!
Walter
 
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grant1842

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Thanks for the comment Walter.
I have to figure out how to do the post first to get the xml.........
 
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grant1842

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Not sure about that. Need to post to that url and get the key from the xml.
Should I be using get ?
 
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grant1842

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Ok one snag.
I get an main.java:623: error: inconvertible types.
here is code.
B4X:
Sub Button1_Click
ToastMessageShow("sdfsd",True)

    'getsessionkey.Download("http://xmldata.qrz.com/xml/current/?username=someuser;password=somepassword;agent=gdf.0")
    Dim job1, job2, job3 As HttpJob
   job1.Initialize("Job1", Me)
   'Send a GET request
   job1.Download2("http://xmldata.qrz.com/xml/current/?username=11111;password=44444;agent=gdf.0", _
      Array As String("first key", "first value :)", "second key", "value 2"))
 


End Sub


Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
      Select Job.JobName
         Case "Job1", "Job2"
            'print the result to the logs
            Log(Job.GetString)
            ToastMessageShow(Job.GetString,True)
            key= Job.GetString
          
            'parse the xml file
            Dim In As InputStream
            In = key   <<<<<<<<<<<<<<<<<<<<<<<<<<<<<error
            parser.Parse(In, "Parser")
                          
      End Select
   Else
      Log("Error: " & Job.ErrorMessage)
      ToastMessageShow("Error: " & Job.ErrorMessage, True)
   End If
   Job.Release
End Sub

Sub Parser_StartElement (Uri As String, Name As String, Attributes As Attributes)

End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("item") > -1 Then
        If Name = "Key" Then
            Title = Text.ToString
        Else If Name = "Count" Then
            Link = Text.ToString
      
        End If
    End If
    If Name = "Key" Then
  
    ToastMessageShow(Name,True)
      
    End If
End Sub

The error is on In= Key.
Do I need to change Dim In As InputStream to something else.
 
Last edited:
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fixit30

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You cannot directly assign a string to an inputstream. You will need to convert it to a byte array first.

B4X:
    Key = Job.GetString
    Dim In As InputStream
    Dim data() As Byte = Key.GetBytes("UTF8")
    In.InitializeFromBytesArray(data, 0, data.Length)
    Parser.Parse(In, "Parser")
 
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fixit30

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You will also need to change the following for your code to work correctly...

B4X:
If Parser.Parents.IndexOf("item") > -1 Then

To

B4X:
If Parser.Parents.IndexOf("Session") > -1 Then
 
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grant1842

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Longtime User
Thanks a lot for your help.
looks like an null ponter.
B4X:
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:18:13 2015</GMTime>
<Remark>cpu: 0.031s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:20:21 2015</GMTime>
<Remark>cpu: 0.037s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:22:39 2015</GMTime>
<Remark>cpu: 0.027s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)

Here is the modified code.
B4X:
Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
      Select Job.JobName
         Case "Job1", "Job2"
            'print the result to the logs
            Log(Job.GetString)
            ToastMessageShow(Job.GetString,True)
            key = Job.GetString
                Dim In As InputStream
                Dim data() As Byte = Key.GetBytes("UTF8")
                In.InitializeFromBytesArray(data, 0, data.Length)
              parser.Parse(In, "Parser")
                           
      End Select
   Else
      Log("Error: " & Job.ErrorMessage)
      ToastMessageShow("Error: " & Job.ErrorMessage, True)
   End If
   Job.Release
End Sub

Sub Parser_StartElement (Uri As String, Name As String, Attributes As Attributes)

End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Session") > -1 Then
        If Name = "Key" Then
            Title = Text.ToString
        Else If Name = "Count" Then
            Link = Text.ToString
       
        End If
    End If
    If Name = "Key" Then
   
    ToastMessageShow(Name,True)
       
    End If
End Sub
Sub Button2_Click
   
End Sub
 
Upvote 0

DonManfred

Expert
Licensed User
Longtime User
i´m not sure but i would try it like this

B4X:
Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
      Select Job.JobName
         Case "Job1", "Job2"
            'print the result to the logs
            Log(Job.GetString)
            ToastMessageShow(Job.GetString,True)
            key = Job.GetString
                Dim In As InputStream = Job.Getinputstream
                'Dim data() As Byte = Key.GetBytes("UTF8")
                'In.InitializeFromBytesArray(data, 0, data.Length)
              parser.Parse(In, "Parser")
                          
      End Select
   Else
      Log("Error: " & Job.ErrorMessage)
      ToastMessageShow("Error: " & Job.ErrorMessage, True)
   End If
   Job.Release
End Sub
 
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walterf25

Expert
Licensed User
Longtime User
Thanks a lot for your help.
looks like an null ponter.
B4X:
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:18:13 2015</GMTime>
<Remark>cpu: 0.031s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:20:21 2015</GMTime>
<Remark>cpu: 0.037s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
JobName = Job1, Success = true
<?xml version="1.0" encoding="iso-8859-1" ?>
<QRZDatabase version="1.33" xmlns="http://xmldata.qrz.com">
<Session>
<Key>ae408468a3aab37fc1372735d8402255</Key>
<Count>9387</Count>
<SubExp>Mon Nov 23 00:00:00 2015</SubExp>
<GMTime>Thu Apr 23 15:22:39 2015</GMTime>
<Remark>cpu: 0.027s</Remark>
</Session>
</QRZDatabase>
Error occurred on line: 187 (main)
java.lang.NullPointerException
    at anywheresoftware.b4a.objects.SaxParser.parse(SaxParser.java:78)
    at anywheresoftware.b4a.objects.SaxParser.Parse(SaxParser.java:73)
    at gra.du.fu.main._jobdone(main.java:630)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:305)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
    at anywheresoftware.b4a.BA$3.run(BA.java:320)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5633)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:896)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:712)
    at dalvik.system.NativeStart.main(Native Method)

Here is the modified code.
B4X:
Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
      Select Job.JobName
         Case "Job1", "Job2"
            'print the result to the logs
            Log(Job.GetString)
            ToastMessageShow(Job.GetString,True)
            key = Job.GetString
                Dim In As InputStream
                Dim data() As Byte = Key.GetBytes("UTF8")
                In.InitializeFromBytesArray(data, 0, data.Length)
              parser.Parse(In, "Parser")
                          
      End Select
   Else
      Log("Error: " & Job.ErrorMessage)
      ToastMessageShow("Error: " & Job.ErrorMessage, True)
   End If
   Job.Release
End Sub

Sub Parser_StartElement (Uri As String, Name As String, Attributes As Attributes)

End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Session") > -1 Then
        If Name = "Key" Then
            Title = Text.ToString
        Else If Name = "Count" Then
            Link = Text.ToString
      
        End If
    End If
    If Name = "Key" Then
  
    ToastMessageShow(Name,True)
      
    End If
End Sub
Sub Button2_Click
  
End Sub
You forgot to initialize the Parser variable that's why you're getting this error.

Cheers,
Walter
 
Upvote 0

walterf25

Expert
Licensed User
Longtime User
Try this should work.

B4X:
Sub Button1_ClickToastMessageShow("sdfsd",True)
Parser.Initialize   'Initialize parser first
'getsessionkey.Download("http://xmldata.qrz.com/xml/current/?username=someuser;password=somepassword;agent=gdf.0")Dim job1, job2, job3 AsHttpJob
 job1.Initialize("Job1", Me)'Send a GET request job1.Download2("http://xmldata.qrz.com/xml/current/?username=km4bob;password=airfile*1;agent=gdf.0", _ArrayAsString("first key", "first value :)", "second key", "value 2"))
End Sub


Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
      Select Job.JobName
         Case "Job1", "Job2"
            'print the result to the logs
            Log(Job.GetString)
            ToastMessageShow(Job.GetString,True)
            key = Job.GetString
                Dim In As InputStream
                Dim data() As Byte = Key.GetBytes("UTF8")
                In.InitializeFromBytesArray(data, 0, data.Length)
              parser.Parse(In, "Parser")
                          
      End Select
   Else
      Log("Error: " & Job.ErrorMessage)
      ToastMessageShow("Error: " & Job.ErrorMessage, True)
   End If
   Job.Release
End Sub

Sub Parser_StartElement (Uri As String, Name As String, Attributes As Attributes)

End Sub
Sub Parser_EndElement (Uri As String, Name As String, Text As StringBuilder)
    If parser.Parents.IndexOf("Session") > -1 Then
        If Name = "Key" Then
            Title = Text.ToString
        Else If Name = "Count" Then
            Link = Text.ToString
      
        End If
    End If
    If Name = "Key" Then
  
    ToastMessageShow(Text.ToString,True)
      
    End If
End Sub
 
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