[WISH] Compiler support for .so library files

wonder said:

So, I have the following kind of "Hello World" C++ project going on here: http://cpp.sh/2ttqh

B4X:

// Example program Distance Between two points in 2D space.
#include <iostream>
#include <math.h>

long distance_between(long x1, long x2, long y1, long y2);

int main()
{
  // this is just an example
  std::cout << distance_between(123, 456, 789, 101) << "\n";
}

long distance_between(long x1, long x2, long y1, long y2)
{
    return sqrt( ((x2-x1)*(x2-x1)) + ((y2-y1)*(y2-y1)) );
}

...and I would like to have a head-to-head performance comparison with its B4A counterpart:

B4X:

Sub DistanceBetween(x1 as Long, x2 as Long, y1 as Long, y2 as Long) as Long
    Return Sqrt(((x2 - x1) * (x2 - x1)) + ((y2 - y1) * (y2 - y1)))
End Sub

How to do it?

Click to expand...

wonder said:

So, I have the following kind of "Hello World" C++ project going on here: http://cpp.sh/2ttqh

B4X:

// Example program Distance Between two points in 2D space.
#include <iostream>
#include <math.h>

long distance_between(long x1, long x2, long y1, long y2);

int main()
{
  // this is just an example
  std::cout << distance_between(123, 456, 789, 101) << "\n";
}

long distance_between(long x1, long x2, long y1, long y2)
{
    return sqrt( ((x2-x1)*(x2-x1)) + ((y2-y1)*(y2-y1)) );
}

...and I would like to have a head-to-head performance comparison with its B4A counterpart:

B4X:

Sub DistanceBetween(x1 as Long, x2 as Long, y1 as Long, y2 as Long) as Long
    Return Sqrt(((x2 - x1) * (x2 - x1)) + ((y2 - y1) * (y2 - y1)))
End Sub

How to do it?

Click to expand...

wonder said:

Alright, I think I made some progress and was able to do everything right in Eclipse, which I downloaded earlier today. Project file attached.

Can anyone help me wrap this Eclipse project into a B4A lib?

Click to expand...

wonder said:

Yes I did, Walter, but I discarded Eclipse in favor of the SLC.

I'm using my Hadouken app for this purposes.
https://www.b4x.com/android/forum/threads/hadouken-b4a-native-library-generator-prototype.60050/

Click to expand...

walterf25 said:

Great, maybe you can shed some light on an issue i'm currently having with an .so library, i'm writing a wrapper for a POS System with card reader and thermal printer, when i call a function that requires the .so file, i get an error telling me that i can't load the .so file and that is not an elf valid executable file, i did some research and using cygwin i tried to read the symbols in the file, that did not work it gave me the same error, telling me that it is not a elf format file, i tried to read two other files and i can read the symbols just fine, my first guess is that the .so file i'm trying to use is not of a compatible architecture or it was compiled for a different system, or the file is corrupted. Sorry i can't provide exact details about the error i get but i'm not home right now and forgot the exact wording of the error!

When i open the jar file of the wrapper, i can see the .so file in the lib folder.

Any thoughts, ideas?

Thanks,
Walter

Click to expand...

wonder said:

Well, I've just started taking my first steps in NDK/JNI, I don't know if I can be of much help.
You might be right, perhaps you got the wrong architecture. Do you have access to the native source code?

Click to expand...

JordiCP said:

Strange... where did you get these so files?

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