loading .so library C++

Question

I'm trying load library library.so, when i try if exist return true, but when I use dlopen return library doesn't exist.

std::ifstream ifile("library.so"); if (ifile) { cout << "Exist!" << std::endl; } cout << "C++ dlopen demo\n\n"; // open the library cout << "Opening hello.so...\n"; void* handle = dlopen("library.so", RTLD_LAZY); if (!handle) { cerr << "Cannot open library: " << dlerror() << '\n'; return 1; }

It might be that the ifstream object locks the file object, try doing a ifile.close() before using dlopen. — Robert
– Robert, Commented May 2, 2013 at 10:33

syam · Accepted Answer · 2013-05-02 10:40:59Z

dlopen is quite restricted in the paths it can search (to keep it short: the default paths plus LD_LIBRARY_PATH variable -- see the full documentation for a complete list). Your ifstream looks in the current directory (whatever it is), which is quite probably not included by default in the paths that dlopen considers.

Solutions include:

Setting LD_LIBRARY_PATH accordingly (which is usually the preferred method).
Using an absolute path instead of a relative one.
Putting your library in one of the default paths (eg. /lib or /usr/lib).

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