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halcon基础数据类型详解

#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_FORMATtypedef INT4_8  Hlong;typedef UINT4_8 Hulong;

 

  看粗体部分,可以看到 Hlong型在32位的机器上其实就是long型 代表4个字节 32位,在64位机器上有另一种定义

 

  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,这个类相当于MFC里面的CObject,halcon从HRootObject派生了HBaseArray,当然这两个类是虚基类,有一些方法需要我HTuple自己实现,当然也有一些方法可以直接用的。这两个类在HCPPUtil里,可以看看。

  HTuple类就是从HBaseArray派生,元组基类,相当于数组,具有如下的构造函数:

  

  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对各种操作符进行了重载:

  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中各种数据之前 ,先来看看这样一个类:

  

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,这四段代码可以说是halcon维护HTuple这种数据类型的精髓了。下面我们来讲解一下:

  首先HTuple类中有私有成员变量:

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,我们往下看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,当然还有图形变量,以后再讲吧。)

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 代表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就可以维护多种不同类型的数据。

  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,都不需要我们手动去做,只需要在前面加个数据类型就行了。

  好了,由于本人水平有限,文中可能会有纰漏,敬请指出!

  added by xiejl