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halcon基础数据类型详解

2014-07-02 10:08 531 查看
#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,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
[b] Hcpar       val;[/b]        // 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                                       */
}[b] Hcpar;                  [/b]/* 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
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