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BOOK: Ivor Horton's Beginning Visual C++ 2008 ISBN: 978-0-470-22590-5
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Old May 23rd, 2009, 02:23 AM
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Question Jagged Arrays in Managed code

Im working on a Windows Forms project and I cant seem to figure this out. The code compiles without error or warnings however during runtime I get the following error:

An unhandled exception of type 'System.NullReferenceException' occurred
Additional information: Object reference not set to an instance of an object.

I am including a very shortened example of my coding.

In a class header file I have the following:

public ref class Profile
{
public:
Profile(void)
{
Init();
}
array<String^>^ Keys;

Init()
{
Keys = gcnew array<String^>(10);
}
};


In the Main header file I have the following(some stuff such as #include left out for conciseness):
public ref class Main
}
public:
Main(void)
{
Init();
}
Profile^ Profiles;
Init()
{
array<Profile^>^ Profiles = gcnew array<Profile^>(10);
Profiles[0]->Keys[0] = "TEST"; //This line generates the error during runtime.
}


If the object Keys is defined as String^ rather than array<String^>^ I can access that member with Profiles[0]->Keys; However when it is defined as an array I cant access it. This is an array defined in the class that I am making an array of. Ive tried to figure out what Im doing wrong for over 8 hours with no luck.

Last edited by sweinhart2006; May 23rd, 2009 at 02:30 AM..


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