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Command line issue

Hello,

Sorry for spamming you with this, but I don't know if you check your email address in the readme.

I am trying to use GCR to command line extract SystemData\start.dol from the game Starfox Adventures.

However it gives me this error at Windows command line:

System.NullReferenceException: Object reference not set to an instance of an object.
   at GCRebuilder.MainForm.Export(String expPath)
   at GCRebuilder.Program.Main(String[] args)

Commands tried so far:

gcr "C:\starfox\game.iso" "&&SystemData\start.dol" "e" "C:\starfox"
gcr "C:\starfox\game.iso" "SystemData\start.dol" "e" "C:\starfox"
gcr C:\starfox\game.iso &&SystemData\start.dol e C:\starfox
gcr "C:\starfox\game.iso" "SystemData\start.dol" "e" "C:\starfox\start.dol"
gcr "C:\starfox\game.iso" "root\SystemData\start.dol" "e" "C:\starfox"
gcr "C:\starfox\game.iso" "\SystemData\start.dol" "e" "C:\starfox"

Looking at the source code, the issue may be in here somewhere:

public void Export(string expPath)
{
    expImpPath = expPath;
    expImpIdx = Convert.ToInt32(selNode.Name);      // is selNode.Name null?
    if (toc.fils[expImpIdx].isDir)                  // is toc.fils null?
        ExportDir();
    else
        Export(expImpIdx, expPath);
}

Starfox and some other GCN games have a unique deflicker vfilter which ruins the graphics a bit. We can patch them in start.dol, and I'm trying to write a tool that automates this patching and then repacking back into the ISO using GCR's command line.

GCR is the only tool that can re-insert files without having to rebuild the entire ISO which saves a lot of time.

Thanks

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