【C语言】实现类效果

【C语言】实现类的继承

C语言如何实现类的效果？

结构体跟类是一种比较类似的结构，都对成员进行了一定程度的封装。区别在于，结构体的成员默认是public，类的成员默认是private。

.h文件

#ifdef __cplusplus  //******  ADD
extern "C" {        //******  ADD
#endif              //******  ADD

#ifdef BCCWIN

#ifdef DOEXPORT
#define EXPORTSPEC __declspec (dllexport)
#else
#define EXPORTSPEC __declspec (dllimport)
#endif

EXPORTSPEC HANDLE __stdcall setPort(char * name, char* baud,char parity);

EXPORTSPEC int __stdcall closePort(HANDLE port);
#endif

//#ifdef __cplusplus  //******  REMOVE moved to top
//extern "C" {        //******  REMOVE moved to top
//#endif              //******  REMOVE moved to top

#define LINUX

#ifdef LINUX

typedef struct ppi{
	long a,b,c,e;
    int int_a;
    int res;
    float d;
    bool isSucceed;
    daveInterface * di;
    daveConnection * dc;
    _daveOSserialType fds;
    void (*ReadBytes)(struct ppi this,int area,int para1,int para2 ,int para3,int *CopyToBuffer);
    void (*WriteBytes)(struct ppi this,int area,int para1,int para2,int para3,int *theAreaOfValue);
}ppi;


void ReadBytes(struct ppi this,int area ,int para1,int para2,int para3,int *CopyToBuffer);

void WriteBytes(struct ppi this,int area ,int para1,int para2,int para3,int *theAreaOfValue);

ppi *NewPPI(ppi *this);
#endif

#ifdef __cplusplus
}
#endif

.c文件

#include
#include
#include
#include"nodavesimple.h"
#include"setport.h"
#include"ppi.h"

void ReadBytes(struct ppi this,int area ,int para1,int para2,int para3,int *CopyToBuffer){
	if(this.isSucceed){
	//	printf("",);
		this.res = daveReadBytes(this.dc,area,para1,para2,para3,CopyToBuffer);
		printf("res=%d\n",this.res);
		this.int_a = daveGetU16(this.dc);
	    	printf("U16:0x%X\n",this.int_a);

	}else{
		printf("error!could not open serial port /dev/ttyUSB0 \n");
	}
}

void WriteBytes(struct ppi this,int area ,int para1,int para2,int para3,int *theAreaOfValue){
	if(this.isSucceed){
		printf("Write\n");
		this.res = daveWriteBytes(this.dc,area,para1,para2,para3,theAreaOfValue);
	}else{
		printf("error!could not open serial port /dev/ttyUSB0 \n");
	}
}

ppi *NewPPI(ppi *this){
//	(this->fds).rfd = serPort("/dev/ttyUSB0","9600",'E');
//	(this->fds).wfd = (this->fds).rfd;
	if((this->fds).rfd>0){
		this->isSucceed = true;
		this->di =daveNewInterface(this->fds, "IF1", 0, daveProtoPPI, daveSpeed187k);
		this->dc =daveNewConnection(this->di, 2, 0, 0);  
		daveConnectPLC(this->dc);
	}else{
		this->isSucceed = false;
	}
	this->ReadBytes = ReadBytes;
	this->WriteBytes = WriteBytes;
}

【C语言】实现类的继承