Android Question [SOLVED] Send LINE Notifity With B4A

Jones Hone · Nov 18, 2020

There is an error message in my program, how can I solve it.

B4X:

'Reference: HTTP & HttpUtils2 Library
Dim http As HttpJob
Dim url As String
url = "https://notify-api.line.me/api/notify"
http.Initialize("",Me)
http.GetRequest.SetHeader("Authorization", "Bearer ZOWe17zgDOzPCwcgBvugMg4ADFeLKenIj7zmJP9MTYs")
http.GetRequest.SetContentType("application/x-www-form-urlencoded")
http.PostString(url,"message=Hollo!")

The following error message occurred: The error position is in the sixth column.

b4x]main_qr_result_found (java line: 518)
java.lang.NullPointerException: Attempt to invoke virtual method 'void org.apache.http.message.AbstractHttpMessage.setHeader(java.lang.String, java.lang.String)' on a null object reference
at anywheresoftware.b4a.http.HttpClientWrapper$HttpUriRequestWrapper.SetHeader(HttpClientWrapper.java:449)
at JHS.QRCodeReaderView.main._qr_result_found(main.java:518)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:196)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:180)
at qrcodereaderviewwrapper.qrCodeReaderViewWrapper$1.result_found(qrCodeReaderViewWrapper.java:103)
at com.dlazaro66.qrcodereaderview.QRCodeReaderView.invokeResultFound(QRCodeReaderView.java:272)
at com.dlazaro66.qrcodereaderview.QRCodeReaderView.onPreviewFrame(QRCodeReaderView.java:153)
at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1263)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:169)
at android.app.ActivityThread.main(ActivityThread.java:6578)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
java.lang.NullPointerException: Attempt to invoke virtual method 'void org.apache.http.message.AbstractHttpMessage.setHeader(java.lang.String, java.lang.String)' on a null object reference

DonManfred · Nov 18, 2020

You are using the old and deprecated httputils routines?
Switch to okhttputils2

HttpUtils2 was replaced with OkHttpUtils2 (5 Years ago): https://www.b4x.com/android/forum/threads/okhttp-replaces-the-http-library.54723/

eps · Nov 18, 2020

The Authorization part of the Header you are setting looks odd to me... Is this as per the documentation for that endpoint?

Jones Hone · Nov 19, 2020

@DonManfred:
I has switch to okhttputils2. However, there are still errors.

java.lang.RuntimeException: java.lang.NullPointerException: Attempt to invoke virtual method 'okhttp3.Request$Builder okhttp3.Request$Builder.header(java.lang.String, java.lang.String)' on a null object reference
at anywheresoftware.b4a.keywords.Common$13.run(Common.java:1692)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:169)
at android.app.ActivityThread.main(ActivityThread.java:6578)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'okhttp3.Request$Builder okhttp3.Request$Builder.header(java.lang.String, java.lang.String)' on a null object reference
at anywheresoftware.b4h.okhttp.OkHttpClientWrapper$OkHttpRequest.SetContentEncoding(OkHttpClientWrapper.java:500)
at JHS.QRCodeReaderView.main$ResumableSub_b1_Click.resume(main.java:411)
at anywheresoftware.b4a.keywords.Common$13.run(Common.java:1690)
... 7 more

@eps:
Yes, The Authorization part is as per the documentation for that endpoint.

This code was successfully executed in VB6, I want to port it to B4A.

Jones Hone · Nov 19, 2020

Maybe ask another way.
How to transfer the following vb6 code to b4a. Thank you.

VB6 Code:

Dim HttpClient As Object,url As String
Set HttpClient = CreateObject("MSXML2.ServerXMLHTTP")
mKEY = "ZOWe17zgDOzPCwcgBvugMg4ADFeLKenIj7zmJP9MTYs"
msg = "message=" & vbCrLf & "This is test message."
url = "https://notify-api.line.me/api/notify"
HttpClient.Open "POST", url, False
HttpClient.SetRequestHeader "Authorization", "Bearer " & mKEY
HttpClient.SetRequestHeader "Content-Type", "application/x-www-form-urlencoded"
HttpClient.Send msg

Erel · Nov 19, 2020

You need to call Job.PostString before making the changes to the request object.

Set HTTP Request Header with OkHttpUtils2

Description: The following code allows you to set the request headers before the request is sent. This is useful for example with sites that block requests without a User-Agent header. This code depends on HttpUtils2 and Http libraries: Dim j As HttpJob j.Initialize("job name", Me)...

www.b4x.com

Jones Hone · Nov 20, 2020

Oh, that's it! Just move ".PostString" to the front and it's ok.
Erel, Thank you very much.

B4X:

Dim http As HttpJob
Dim url As String
url = "https://notify-api.line.me/api/notify"
http.Initialize("",Me)
http.PostString(url,"message=Hollo!")
http.GetRequest.SetHeader("Authorization", "Bearer ZOWe17zgDOzPCwcgBvugMg4ADFeLKenIj7zmJP9MTYs")
http.GetRequest.SetContentType("application/x-www-form-urlencoded")

Android Question [SOLVED] Send LINE Notifity With B4A

Jones Hone

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DonManfred

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eps

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Jones Hone

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Jones Hone

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Erel

B4X founder

Set HTTP Request Header with OkHttpUtils2

Jones Hone

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Android Question [SOLVED] Send LINE Notifity With B4A

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