Question

I am getting an error in the following code. I could not guess what mistake i have done for such error to come up.

remote.h

 struct RMH_REQUEST_SESSION_MSG  //Message Data
 {
  int  uDeviceID;
  int  uProtocolVersion;
  int  uReserved[5];
 };

RS232MsgRequestSession.m

@implementation RS232MsgRequestSession

-(id)init
{
    if (self = [super init]) {
        struct RMH_REQUEST_SESSION_MSG st;
    }
    return self;
}
@end

xyz.h

#import "RS232MsgRequestSession.h"

@implementation xyz

     -(void)Open{

         RS232MsgRequestSession* pMsg = [[RS232MsgRequestSession alloc]init];

    pMsg->st.uProtocolVersion = RS232_VERSION; //error
    pMsg->st.uDeviceID = RS232_PROTOCOL_DEVICE_ID; //error
    memset(pMsg->st.uReserved,0x00,sizeof(pMsg->st.uReserved)); //error

    }
@end

Error:’struct RS232MsgRequestSession’ has no member named ‘st’

Answer 1

Put iVar declaration in class’s @interface block. In your code st is just a local variable in init method:

@interface RS232MsgRequestSession : NSObject{
...
@public
struct RMH_REQUEST_SESSION_MSG st;
}
...
@end