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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!
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