"Object reference not set to an instance of an object"

[RileyCat]

I have a C++ DLL which is called from a C# GUI. I know that part of it works. Where I'm getting "stuck" is when I try to fill in some data to a class member which is a structure. I keep getting hit with ...

"Object reference not set to an instance of an object."

My class looks like this ....

class CNmsOperator
{

public:
CNmsOperator(void);

void Oper_CallOper (int oper, bool reserve) ;
void Oper_RecvOper (MSG_JOB_DATA * pOprMsg) ;

bool getOperInfo () { return (OperInfo); }

private:
OPERATOR_INFO m_OperInfoObj ;

volatile JOB_INDEX_RECORD * OperKey ;

bool OperInfo ;
// TODO: add your methods here.
};

In my CPP file I declare the following ...

static JOB_INDEX_RECORD volatile GOperKey ;

/* Class Constructor ... */

CNmsOperator::CNmsOperator(void)
{
OperKey = &GOperKey ;
}

/* And the function I'm touching OperKey ... */

void CNmsOperator::Oper_CallOper (int oper, bool reserve)
{
OperInfo = false ;

ZERO (OperKey) ;
ICN_1ST_PART(OperKey->icn) = ICN_OPERATOR_PREFIX ;
if (oper != OP_DEFAULT_NEW_DB_OP)
{
ICN_2ND_PART(OperKey->icn) = oper % 100000 ;
}
else
{
ICN_2ND_PART(OperKey->icn) = oper ;
}
OperKey->headslip = 0 ;
OperKey->record_type = J_OPERATOR_INFO ;
OperKey->piece = 0 ;
OperKey->anything = reserve ;

// TODO:
NmsMsg_ProcessSend ((JOB_INDEX_RECORD *)OperKey, NmsOper_RecvOper) ;
//NmsMsg_ProcessSend (&OperKey, NmsOper_RecvOper) ;
}


I'm getting the exception as soon as I start toughing OperKey in function Oper_CallOper.

Any ideas/suggestions/recommendations would be appreciated. I'm stumped on this one.

Thanks in advance!

 

[timmay3141]

What exactly does ZERO(OperKey) do? Your description makes it sound like OperKey is NULL, which would understandably cause some problems.

 

[mrscary]

What is the c# signature?

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[Legionaire]

I don't think you set your static variable "OperKey" correctly.

 

[Cagliostro]

it means GOperKey is not initialized or some member og GOperKey is not initialized. Read more attentive the description of error to see exactly which one.

Ion Filipski