Using static variables->Objective C

I am getting warnings when declaring and using the static variables.

static int m_chSequenceChar; 

@interface data : NSObject
{

}
-(id)init;
-(void)initialze;
@end

@implementation data

- (id)init
{

 m_chSequenceChar= 0;
}

+ (void)initialize
{

  m_chSequenceChar= 0;

}

@end

Warning: 'm_chSequenceChar' defined but not used

EDITED:

data.h
------

static int m_nMessageId;      //Message ID
static int m_uSessionId;      //Session ID
static int m_chSequenceChar;  //Sequence ID

static int* m_pData;          //Integer buffer to carry dat开发者_JAVA技巧a
static int m_uDataSize;       //Datasize

@interface data : NSObject {

    @public


}


data.m
------

@implementation data

+ (void)initialize
{
    m_uSessionId    = 0;
    m_chSequenceChar= 0;

    m_nMessageId    = 0;
    m_pData         = 0;              
    m_uDataSize     = 0; 

}
- (id) initWithID:(int) uMessageId withData:(id)pData withSize:(size_t) uDataSize
{
        if(self=[super init])
        {
           // Initialize the member variables
            m_uSessionId    = 0xFF;
            m_chSequenceChar= 10;

           // Initialize values from derived class
            m_nMessageId    = uMessageId;
            m_pData         = (int*)pData;              
            m_uDataSize     = (int)uDataSize;            
        }
        NSLog(@"Data size:%d",uDataSize);
        NSLog(@"m_pData:%d",m_pData);
        NSLog(@"pData:%d",pData);

     data* dat = [data alloc];
     return self;   
}

@end

That’s because you’re not reading the value of m_chSequenceChar in your code. If you’re not reading it, you’re not using it, hence the warning.

Also, are you sure you want to reset m_chSequenceChar to 0 whenever an instance of data receives -init? In general, +initialize should be enough. And, in fact, you don’t even need to explicitly set it to 0.