QPluginLoader instance always returns null

[high_flyer]

No, Both are in debug!

do you have any other 3rd party dependencies which might be in release?

I'd try to build your project in release and try to see if it works, its an easy test worth trying.

[meysam_hashemi]

do you have any other 3rd party dependencies which might be in release?

I'd try to build your project in release and try to see if it works, its an easy test worth trying.

No man i dont

I made simple console application and included my library header and lib file and called the function and this is the error i get when i run the application. So it must be it. But seriously why!!!

The Code:

LPWFSRESULT result = new WFSRESULT();
WFSFreeResult(result)

LPWFSRESULT result = new WFSRESULT();
WFSFreeResult(result)

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mingw.jpg

[high_flyer]

Is this typo 'DeviceMAnager' really in the code or only in the code posted here?:

if (plugin)
{
    deviceManager = qobject_cast<DeviceMAnager *>(plugin);
    return true;
}

if (plugin)
{
    deviceManager = qobject_cast<DeviceMAnager *>(plugin);
    return true;
}

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I'd add some defencive code here:

QPluginLoader * pluginLoader = new QPluginLoader(pluginPath.c_str());
QObject * plugin = pluginLoader->instance();
 
if (plugin)
{
    deviceManager = qobject_cast<DeviceMAnager *>(plugin);
    if(deviceManager) return true;
    return false;;
}
else
{
    delete pluginLoader;
    return false;
}

QPluginLoader * pluginLoader = new QPluginLoader(pluginPath.c_str());
QObject * plugin = pluginLoader->instance();

if (plugin)
{
    deviceManager = qobject_cast<DeviceMAnager *>(plugin);
    if(deviceManager) return true;
    return false;;
}
else
{
    delete pluginLoader;
    return false;
}

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[ChrisW67]

Your screenshot clearly shows error 0xc0000135, which means STATUS_DLL_NOT_FOUND. This goes back to:

Are all of the external runtime dependencies of the plugin DLL met in the environment in which it is running? That is, if Device-Manager.dll depends on foolib.dll is that in the PATH?

Is the MSXFS.DLL in the run time PATH of the process or in the same directory as the plugin DLL? Is everything the MSXFS.DLL depends on also in one of those locations?

[meysam_hashemi]

Your screenshot clearly shows error 0xc0000135, which means STATUS_DLL_NOT_FOUND. This goes back to:

Is the MSXFS.DLL in the run time PATH of the process or in the same directory as the plugin DLL? Is everything the MSXFS.DLL depends on also in one of those locations?

Yes.

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Well, I found the problem however its so silly. I run project over windows 10 32 bit and it work fine. Maybe something is not incompatible with 64 bit and that caused this mess.

Thanks everyone for all your solution and i hope your solutions help others problem.

Thanks alot!