ERRPR: Object reference not set to an instance of an object

This is a discussion on ERRPR: Object reference not set to an instance of an object within the C++ Programming forums, part of the General Programming Boards category; Hey when ever i start debugging my program i get this one error that causes the program to crash. the ...

  1. #1
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    Jul 2005
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    ERRPR: Object reference not set to an instance of an object

    Hey when ever i start debugging my program i get this one error that causes the program to crash. the error is :Object reference not set to an instance of an object

    Here is the part of the code that needs to be seen:
    Code:
    Microsoft::Win32::RegistryKey^ key = Microsoft::Win32::Registry::CurrentUser->OpenSubKey( "Software\\Policies\\Microsoft\\Windows\\System\\DisableCMD");
    		System::Object^ result;
    		result = key->GetValue("DisableCMD");
    		String^ val = result->ToString();
    		System::Windows::Forms::MessageBox::Show(val);
    I always get the error at the line:
    result = key->GetValue("DisableCMD");

    Error:An unhandled exception of type 'System.NullReferenceException' occurred in mscorlib.dll

    Additional information: Object reference not set to an instance of an object.

    I checked to make sure the value existed and it did, but even if the value doesn't exist, i thought it would just set the variable equal to 'null' but maybe i am wrong. if someone could help me with this problem i would be very grateful.
    Last edited by blackhack; 07-13-2005 at 07:31 PM.

  2. #2
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    Is there a registry key at the address you're pointing to? The first thing that comes to my mind is that there isn't, so key actually gets set to null, and it crashed when you call GetValue on a null pointer.

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