Re: Segmentation fault while creating a class object by dlsym-ed function

[Konstantin J. Chernov]

Thank you for your replies!

I've found a working solution - all I needed is to change wstring 
to const wstring, and pass it not as func("something"), but as

  wstring tmp = "something"; func(tmp);

That's really odd, because I don't understand, how those changes 
made segfault disappear.

Here's the working code:

test.d:

import std.c.linux.linux;
import std.stdio;
import testclass;

int main(string[] args)
{
    void* handle = dlopen("./testclass.so", RTLD_LAZY | 
RTLD_LOCAL);
    testclass function(const wstring) a;
    a = cast(testclass function(const wstring))dlsym(handle, 
"loadClass");
    wstring tmp = "Test";
    testclass b = a(tmp);
    return 0;
}

testclass.di:

class testclass
{
    this(const wstring loadmsg);
    ~this();
    wstring foo();
};

testclass.d:

import std.stdio;

class testclass
{
    private wstring msg;
    this(const wstring loadmsg)
    {
        writeln("Class constructor");
        this.msg = loadmsg;
    }
    ~this()
    {
    }
    wstring foo()
    {
        return msg;
    }
};

extern(C) testclass loadClass(const wstring loadmsg)
{
    return new testclass(loadmsg);
}


dmd test.d -L-ldl
dmd testclass.d -fPIC -shared