Can't load nppdf.so. How to load lib without dlopen()?

From: ebleble (ebleble_at_poczta.fm)
Date: 05/29/04

  • Next message: Jens.Toerring_at_physik.fu-berlin.de: "Re: Can't load nppdf.so. How to load lib without dlopen()?" 
    Date: 29 May 2004 09:53:27 -0700

    Hi,
    I try to load 'nppdf.so' library

    #include <dlfcn.h>
    #include <iostream>
    using namespace std;
     
    int main()
    {
            cerr << "Loading library..." << endl;
            void *handle = dlopen("/usr/local/Acrobat5/Browsers/intellinux/nppdf.so",
    RTLD_LAZY);
            
            if (handle)
            {
                    cerr << "Unloading library..." << endl;
                    dlclose(handle);
                    return 0;
            }

            cerr << "error: " << dlerror() << endl;

            return 0;
    }

    but when I run this program I get an error
    "/usr/local/Acrobat5/Browsers/intellinux/nppdf.so: undefined symbol:
    XtStrings"

    Any ideas why?

    Do you know any alternative way (without using dlopen()) of loading
    ".so" libs ?

    //////////////////////////////////////////////////////
    Mozilla loads plugins in a following way
    //////////////////////////////////////////////////////
    PRLibrary *dlopen_obj;
        info->dlopen_obj = NULL;
        info->dlopen_obj = NULL;
        if (plugin->dlopen_obj == NULL) {
            plugin->dlopen_obj = PR_LoadLibrary(plugin->filename);
            if (plugin->dlopen_obj == NULL) {
                (NP_CREATEPLUGIN)PR_FindSymbol("NP_CreatePlugin",
    plugin->dlopen_obj);
                (NP_CREATEPLUGIN)PR_FindSymbol(plugin->dlopen_obj,
    "NP_CreatePlugin");
                    int err = PR_UnloadLibrary(plugin->dlopen_obj);
                    plugin->dlopen_obj = NULL;
                f = (NPError(*)(NPNetscapeFuncs *, NPPluginFuncs *))
    PR_FindSymbol("NP_Initialize", plugin->dlopen_obj);
                f = (NPError(*)(NPNetscapeFuncs *, NPPluginFuncs *))
    PR_FindSymbol(plugin->dlopen_obj, "NP_Initialize");
                    int err = PR_UnloadLibrary(plugin->dlopen_obj);
                    plugin->dlopen_obj = NULL;
                    int err = PR_UnloadLibrary(plugin->dlopen_obj);
                    plugin->dlopen_obj = NULL;
                plugin->shutdown = (NPError(*)(void))
    PR_FindSymbol("NP_Shutdown", plugin->dlopen_obj);
                plugin->shutdown = (NPError(*)(void))
    PR_FindSymbol(plugin->dlopen_obj, "NP_Shutdown");
            int err = PR_UnloadLibrary(plugin->dlopen_obj);
            plugin->dlopen_obj = NULL;
    /////////////////////////////////////////////////////
    but I can't find definition of PRLibrary, PR_LoadLibrary(),
    PR_UnloadLibrary() in Mozilla's source code. It seems that plugin is
    loading without dlopen.

    Does anybody know how to load plugins (HOWTO or tutorial)?

    Thanks in advance
    ebleble

  • Next message: Jens.Toerring_at_physik.fu-berlin.de: "Re: Can't load nppdf.so. How to load lib without dlopen()?"

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