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C語言宏定義技巧（常用宏定義） 
寫好C語言,漂亮的宏定義很重要,使用宏定義可以防止出錯(cuò),提高可移植性,可讀性,方便性 等等。下面列舉一些成熟軟件中常用得宏定義。。。。。。

1,防止一個(gè)頭文件被重復(fù)包含
#ifndef COMDEF_H
#define COMDEF_H
  //頭文件內(nèi)容
#endif
2,重新定義一些類型,防止由于各種平臺(tái)和編譯器的不同,而產(chǎn)生的類型字節(jié)數(shù)差異,方便移植。
typedef  unsigned char      boolean;     /* Boolean value type. */

typedef  unsigned long int  uint32;      /* Unsigned 32 bit value */

typedef  unsigned short     uint16;      /* Unsigned 16 bit value */

typedef  unsigned char      uint8;       /* Unsigned 8  bit value */

typedef  signed long int    int32;       /* Signed 32 bit value */

typedef  signed short       int16;       /* Signed 16 bit value */

typedef  signed char        int8;        /* Signed 8  bit value */

//下面的不建議使用
typedef  unsigned char     byte;         /* Unsigned 8  bit value type. */

typedef  unsigned short    word;         /* Unsinged 16 bit value type. */

typedef  unsigned long     dword;        /* Unsigned 32 bit value type. */

typedef  unsigned char     uint1;        /* Unsigned 8  bit value type. */

typedef  unsigned short    uint2;        /* Unsigned 16 bit value type. */

typedef  unsigned long     uint4;        /* Unsigned 32 bit value type. */

typedef  signed char       int1;         /* Signed 8  bit value type. */

typedef  signed short      int2;         /* Signed 16 bit value type. */

typedef  long int          int4;         /* Signed 32 bit value type. */

typedef  signed long       sint31;       /* Signed 32 bit value */

typedef  signed short      sint15;       /* Signed 16 bit value */

typedef  signed char       sint7;        /* Signed 8  bit value */

3,得到指定地址上的一個(gè)字節(jié)或字