LPBYTE宏在编译时生成错误-C ++

Question

I have the following code that is generating an error when I try to build the application:

#define LPAFDU LPBYTE;

typedef struct appAfDataIndIeee_tag
{
    integrPktHead_t head;
    BYTE flags;
    WORD dstShort;
    BYTE dstEndpoint;
    BYTE srcShort;
    BYTE srcIeee[8];
    WORD clusterId;
    BYTE afduLength;
    LPAFDU afdu;       // <-- error
} appAfDataIndIeee_t;

This is the error it generates:

error C2208: 'BYTE *' : no members defined using this type
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

If I switch out LPADFU for LPBYTE it compiles successfully. I would prefer to use a define or type-definition of LPADFU . Does anyone know how I can make this work? Thanks.

Answer 1

Get rid of the semicolon at the end of your #define (it's part of the macro):

#define LPAFDU LPBYTE

A far better way to do this, however, is to use typedef rather than #define :

typedef LPBYTE LPAFDU;

The most important advantage of typedefs is that they obey scope rules.

Answer 2

Remove the semicolon from your declaration of LPAFDU.

#define LPAFDU LPBYTE

You're probably thinking of a typedef statement, which would have a semicolon. With #define , the definition is inserted wherever the macro is, including your semicolon.