halcon基础数据类型详解

时间 2019-11-22

标签 halcon 基础数据类型详解繁體版

原文原文链接

#if defined(__CHAR_UNSIGNED__) || defined(__sgi) 
#define  INT1      signed char       /* integer, signed 1 Byte         */
#define  INT1_MIN  SCHAR_MIN
#define  INT1_MAX  SCHAR_MAX
#else
#define  INT1      char              /* integer, signed 1 Byte         */
#define  INT1_MIN  CHAR_MIN
#define  INT1_MAX  CHAR_MAX
#endif
#define  UINT1     unsigned char     /* integer, unsigned 1 Byte       */
#define  UINT1_MIN 0
#define  UINT1_MAX UCHAR_MAX

#define LONG_FORMAT _INT64_FORMAT typedef INT4_8 Hlong; typedef UINT4_8 Hulong;

　　看粗体部分，能够看到 Hlong型在32位的机器上其实就是long型表明4个字节 32位，在64位机器上有另外一种定义数组

　　再来看看halcon中最重要的数据类型HTuple，在C++里面，halcon将HTuple类型封装了类，其始祖类HRootObject，这个类至关于MFC里面的CObject，halcon从HRootObject派生了HBaseArray，固然这两个类是虚基类，有一些方法须要我HTuple本身实现，固然也有一些方法能够直接用的。这两个类在HCPPUtil里，能够看看。函数

　　HTuple类就是从HBaseArray派生，元组基类，至关于数组，具备以下的构造函数：spa

  HTuple(int l);
  HTuple(float f);
  HTuple(double d);
  HTuple(const char *s);
  HTuple(const HCtrlVal &c);
  HTuple(const HTuple &in):HBaseArray() {CopyTuple(in);}
  HTuple(Hlong length, const HTuple &value);
  HTuple(const HTuple &length, const HTuple &value);
  HTuple(SpecialTuple d);

　　HTuple对各类操做符进行了重载：指针

  operator     HCtrlVal(void) const;
  HTuple       operator () (Hlong min, Hlong max) const;
  HTuple       operator () (const HTuple &min, const HTuple &max) const;
  HCtrlVal    &operator [] (Hlong index);
  HCtrlVal     operator [] (Hlong index) const;
  HCtrlVal    &operator [] (const HTuple &index);
  HCtrlVal     operator [] (const HTuple &index) const;
  HTuple      &operator ++ (void); // nur fuer double und Hlong
  HBool        operator !  (void) const;
  HTuple       operator ~  (void) const;
  HTuple       operator << (const HTuple &val) const;
  HTuple       operator << (Hlong val) const;
  HTuple       operator >> (const HTuple &val) const;
  HTuple       operator >> (Hlong val) const;
  HTuple       operator +  (const HTuple &val) const;
  HTuple       operator +  (double val) const;
  HTuple       operator +  (int val) const;

　　在讲解halcon是如何维护这样一个HTuple中各类数据以前，先来看看这样一个类：code

class LIntExport HCtrlVal  {
  friend class HTuple;
public:
  HCtrlVal(void)      {val.type  = UndefVal;  val.par.l = 0;}
#if !defined(_TMS320C6X)
  HCtrlVal(Hlong l)   {val.type  = LongVal;   val.par.l = l;}
#endif
  HCtrlVal(int l)     {val.type  = LongVal;   val.par.l = l;}
  HCtrlVal(double d)  {val.type  = DoubleVal; val.par.f = d;}
  HCtrlVal(const char *s);
  HCtrlVal(const HCtrlVal &v) {CopyCtrlVal(v);}
  ~HCtrlVal(void)             {ClearCtrlVal();}
  HCtrlVal& operator = (const HCtrlVal &v);
 
  // Type conversion
  int         ValType() const          {return val.type;}
  operator    int(void) const          {return I();}
#if !defined(_TMS320C6X)
  operator    Hlong(void) const        {return L();}
#endif
  operator    double(void) const       {return D();}
  operator    const char*(void) const  {return S();}
  operator    const Hcpar&(void)const  {return HCPAR();}
  // Access contents
  double          D() const;
  Hlong           L() const;
  int             I() const;
  const char *    S() const;
  const Hcpar&    HCPAR()const;
  // Arithmetics
  HCtrlVal     operator + (const HCtrlVal &val) const;
  HTuple       operator + (const HTuple &val) const;
  HCtrlVal     operator - (const HCtrlVal &val) const;
  HTuple       operator - (const HTuple &val) const;
  HCtrlVal     operator * (const HCtrlVal &val) const;
  HTuple       operator * (const HTuple &val) const;
  HCtrlVal     operator / (const HCtrlVal &val) const;
  HTuple       operator / (const HTuple &val) const;
  HCtrlVal     operator % (const HCtrlVal &val) const;
  HTuple       operator % (const HTuple &val) const;
  HBool        operator != (const HCtrlVal &val) const;
  HBool        operator != (const HTuple &val) const;
  HBool        operator == (const HCtrlVal &val) const;
  HBool        operator == (const HTuple &val) const;
  HBool        operator >= (const HCtrlVal &val) const;
  HBool        operator >= (const HTuple &val) const;
  HBool        operator <= (const HCtrlVal &val) const;
  HBool        operator <= (const HTuple &val) const;
  HBool        operator > (const HCtrlVal &val) const;
  HBool        operator > (const HTuple &val) const;
  HBool        operator < (const HCtrlVal &val) const;
  HBool        operator < (const HTuple &val) const;

  const char *ClassName(void) const { return "HCtrlVal"; }
  int Version(void) const;
  int Revision(void) const;
  const char *Creation(void) const;
  
private:
  // Data
  Hcpar val;        // Value: one of the three types and type specifyer
  // Support operationen
  void ClearCtrlVal();
  void CopyCtrlVal(const HCtrlVal& source);
};

typedef struct
{
  Hpar   par;             /* values                                          */
  INT1   type;            /* type flag                                       */
} Hcpar; /* parameter passing for the C interface           */

typedef union 
{
  INT4_8  l;              /* 4/8 byte integer                       (input)  */
  double  f;              /* 8 byte real                            (input)  */
  char    *s;             /* pointer to strings                     (input)  */
} Hpar;                   /* parameter passing for the C interface           */

typedef union 
{
  INT4_8  *l;             /* 4/8 byte integer                       (output) */
  double  *f;             /* 8 byte real                            (output) */
  char    *s;             /* pointer to strings                     (output) */
  VOIDP   p;              /* pointer to var. of any type (e.g. tuple)(output)*/
} Hvar;                   /* parameter passing for the C interface           */

　　仔细看我用红色粗体并加大的部分，这四段代码能够说是halcon维护HTuple这种数据类型的精髓了。下面咱们来说解一下：blog

　　首先HTuple类中有私有成员变量：three

private:
  HCtrlVal    *tuple;       // values (array of Hlong/float/string)

　　halcon给的注释写的很清楚，tuple是一群值，指向一个数组，数组里面有long型，浮点型及字符串型数据。这是一个指针，这个类就是维护这样一个指针，具体此指针的内容，咱们往下看HCtrlVal：（这里说一下这几个单词的意义吧：H->Halcon Ctrl->Control Val->Values 表示Halcon的控制变量，固然还有图形变量，之后再讲吧。）ci

private:
  // Data
  Hcpar       val;        // Value: one of the three types and type specifyer

　　HCtrlVal类就维护了这样一个成员变量，halcon给的注释是说 val 表明数据的三种类型中的一个，并指向一个值。那么HTuple中的tuple指针就是维护了val组成的链表，这样HTuple就能够维护多种不一样类型的数据。字符串

　　HTuple用起来的确很方便，halcon对其进行了大量的运算符重载包括像强制类型转换，都不须要咱们手动去作，只须要在前面加个数据类型就好了。input

　　好了，因为本人水平有限，文中可能会有纰漏，敬请指出！

　　added by xiejl