Java Question Native .so library for x86 and b4j

[DonManfred]

I am doing a wrapper which can be used in android (b4a library) and as there is a x86 native .so file available i thought it should work in b4j too.

The libtdjni.so is in the jar file unter {tdl4j.jar}\lib\x86

I get an error when running

main._process_globals (java line: 144)
java.lang.UnsatisfiedLinkError: no tdjni in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
at de.donmanfred.TDLApiwrapper.<clinit>(TDLApiwrapper.java:50)
at b4j.example.main._process_globals(main.java:144)
at b4j.example.main.initializeProcessGlobals(main.java:131)
at b4j.example.main.start(main.java:35)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$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(Thread.java:748

Do i need to place them in another directory?

 

[Erel]

The lib folder is specific to Android.

You will need to copy it to File.DirData and load it from there. You can let the developer pass the folder path to your library and only then load it.

 

[DonManfred]

copy it to File.DirData and load it from there

How can i load it from there?

    static {
        System.loadLibrary("tdjni");
    }

and in System.loadLibrary i can not use a path.

 

[stevel05]

Try System.load(FileName)

load(String filename)
Loads a code file with the specified filename from the local file system as a dynamic library.

 

[Erel]

Note that the call doesn't need to be in a static constructor.

 

[DonManfred]

Try System.load(FileName)

That works. Great. But now i get the error

main._process_globals (java line: 146)
java.lang.UnsatisfiedLinkError: D:\AppData\Roaming\TelegramTdLib\libtdjni.so: Can't load this .dll (machine code=0x34) on a IA 32-bit platform
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
at java.lang.Runtime.load0(Runtime.java:809)
at java.lang.System.load(System.java:1086)
at de.donmanfred.TDLApiwrapper.<clinit>(TDLApiwrapper.java:50)
at b4j.example.main._process_globals(main.java:146)
at b4j.example.main.initializeProcessGlobals(main.java:133)
at b4j.example.main.start(main.java:35)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$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(Thread.java:748)

 

[JordiCP]

Seems as if the library was built for 64bit architecture?

 

[DonManfred]

It is distributed in a x86 folder
See https://core.telegram.org/tdlib/tdlib.zip

 

[JordiCP]

You are right, it is 32bit (can be checked with this or similar tools: https://sourceforge.net/projects/elfviewer/ )
Also, it seems to be the same case as HERE but wasn't solved.

Just guessing, is it possible that your first assumption isn't correct, and the x86 lib is also for x86 Android?

 

[Erel]

Just guessing, is it possible that your first assumption isn't correct, and the x86 lib is also for x86 Android?

That's a good point...

 

[DonManfred]

Just guessing, is it possible that your first assumption isn't correct, and the x86 lib is also for x86 Android?

That's a good point...

You mean it is possible that the .so is for x86 Android (and not for windows x86 as i initially thought)? I did not know that a x86 Android exists at all.
Ok then. I can probably run it on an android emulator on my PC?

So for windows i need to compile it by myself to get a dll which i could use in B4J?

 

[JordiCP]

You mean it is possible that the .so is for x86 Android (and not for windows x86 as i initially thought)? I did not know that a x86 Android exists at all.
Ok then. I can probably run it on an android emulator on my PC?

That's what I thought and made some sense to me, but not sure. Also, if you look at the source code files, there is a suspicious import "android.logs...." so it makes even a bit more of sense.

So for windows i need to compile it by myself to get a dll which i could use in B4J?

I think so (if the above is true)

 

[Erel]

The x86 is for the Android emulator.

 

[DonManfred]

Ohh, ok. Then the lib does work only on Android (for now).

I´ll ask someone to help compiling it maybe to a windows dll.

Based on the comment on Telegram website it should be possible (at least i think so).

https://telegram.org/blog/tdlib

Universally useful
TDLib supports all Telegram features and makes developing Telegram apps a breeze on any platform. It can be used on Android, iOS, Windows, macOS, Linux and virtually any other system. The library is compatible with any programming language that can execute C functions; it also has native bindings to Java and C#.