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问 各位老大，我想用C描述对象，产品太大。

结构中定义的函数指针与函数名相同，想作为类的方法用的。

如这样的话，每个对象方法都要一个一个赋值. 答 1: 每个对象方法都要一个一个赋值，有什么问题吗？用C实现OOP的思路是一个好的实践，支持！ 答 2: 没法才这样做的，没掌握C++ 答 3: 估计LZ想这样用吧。支持！最好是说成类和实例比较清楚点。类是抽象的概念，实例是具体的存在。
LZ大概是要这样用C吧。支持！

#ifndef IIC_H
#define IIC_H

#include <CommonType.h>
#include <Delay.h>

#define IIC_BITSEQHL    0
#define IIC_BITSEQLH    1

typedef void (*PFNIICSetPin)(BIT btValue);                                           
typedef BIT (*PFNIICGetPin)(void);

typedef struct tagFNIIC
{
    BIT        btIIC_LL;        /*正逻辑或负逻辑*/
    BIT        btIIC_HH;
    INT8U    nIICBitSeq;
    PFNIICSetPin pfnSetIICSDA;
    PFNIICGetPin pfnGetIICSDA;
    PFNIICSetPin pfnSetIICSCL;
    PFNIICGetPin pfnGetIICSCL;
}FNIIC, *PFNIIC;

/*****************函数声明*****************/
void IICStart(PFNIIC pfnIIC);
void IICStop(PFNIIC pfnIIC);
void IICSendBit(PFNIIC pfnIIC, BIT btValue);
BOOL IICSendAckBit(PFNIIC pfnIIC, BIT btValue);
BOOL IICReceiveAckBit(PFNIIC pfnIIC, BIT btCompare);
INT8U IICReceiveBits8(PFNIIC pfnIIC, INT8U nBitsNumber);
void IICSendBits8(PFNIIC pfnIIC, INT8U nValue, INT8U nBitsNumber);
BYTE IICReceiveByte(PFNIIC pfnIIC);
void IICSendByte(PFNIIC pfnIIC, BYTE byValue);
INT16U IICReceiveBits16(PFNIIC pfnIIC, INT8U nBitsNumber);
void IICSendBits16(PFNIIC pfnIIC, INT16U nValue, INT8U nBitsNumber);
WORD IICReceiveWord(PFNIIC pfnIIC);
void IICSendWord(PFNIIC pfnIIC, WORD wValue);
INT32U IICReceiveBits32(PFNIIC pfnIIC, INT8U nBitsNumber);
void IICSendBits32(PFNIIC pfnIIC, INT32U nValue, INT8U nBitsNumber);
DWORD IICReceiveDWord(PFNIIC pfnIIC);
void IICSendDWord(PFNIIC pfnIIC, DWORD dwValue);

#endif /*IIC_H*/



typedef struct tagAT24CXX
{
    INT8U nDeviceAddressBitsCount;            /*器件地址位数,包括固定和地址线可选的*/
    //INT8U nAddressInDeviceAddressBitsCount;    /*地址位在设备地址里的位数*/
    INT8U nWordAddressBitsCount;            /*地址位数,不包括在设备地址里的地址位数;两部分合起来是真正全部地址*/
    INT8U nBytesPerPage;                    /*每页字节数*/
    //INT8U nDeviceAddress;
    PFNIIC pfnIIC;
    /*************带在函数参数里*********
    INT8U nDeviceAddress;
    INT8U nAddressInDeviceAddress;
    WORD  wWordAdress;
    *************************************/
}AT24CXX, *PAT24CXX;


#ifndef AT24CXX_H
#define AT24CXX_H
/**********所谓的设备地址nDeviceAddress不包含存储地址,存储地址全部在dwAddress里**********/
/*输入外部设备地址和地址,处理输出命令字设备地址和地址*/
void AT24CXX_MakeAddress(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress, DWORD dwAddress, PINT8U pnDeviceAddress, PWORD pwAddress);
/**********往总线上送一字节,并收ACK,成功返回1,否则返回0************/
BOOL AT24CXX_SendByte(PAT24CXX pAT24CXXDev, BYTE btData);
BYTE AT24CXX_ReceivedByte(PAT24CXX pAT24CXXDev);
void AT24CXX_Start(PAT24CXX pAT24CXXDev);
void AT24CXX_Stop(PAT24CXX pAT24CXXDev);
BOOL AT24CXX_ByteWrite(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress, DWORD dwAddress, BYTE btData);
BOOL AT24CXX_PageWrite(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress, DWORD dwAddress, PBYTE pbtPageData);
BYTE AT24CXX_CurrentRead(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress);
BYTE AT24CXX_RandomtRead(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress, DWORD dwAddress);
PBYTE AT24CXX_SeqRead(PAT24CXX pAT24CXXDev, INT8U nDeviceAddress, DWORD dwAddress, PBYTE pbtData, INT8U nReadNumber);
#endif    /*AT24CXX_H*/


/*********测试调用******************/
void Set_IIC_SDA(BIT btValue)
{
    //DelayMS(Delay1MS, 1);
    btValue &= 0x01;
    IIC_SDA_BIT = (BIT)btValue;
}

BIT Get_IIC_SDA(void)
{
    //DelayMS(Delay1MS, 1);
    return IIC_SDA_BIT&0x01;
}

void Set_IIC_SCL(BIT btValue)
{
    //DelayMS(Delay1MS, 1);
    btValue &= 0x01;
    IIC_SCL_BIT = (BIT)btValue;
}

BIT Get_IIC_SCL(void)
{
    //DelayMS(Delay1MS, 1);
    return IIC_SCL_BIT&0x01;     
}


    AT24CXX    g_at24cxx = {0};
    FNIIC    g_fnIIC = {0};
    INT8U nData = 0;
    WORD i = 0;
    BYTE szBuffer[20] = {0};

    g_fnIIC.nIICBitSeq = IIC_BITSEQHL;
    g_fnIIC.btIIC_LL = 0;
    g_fnIIC.btIIC_HH = 1;    
    g_fnIIC.pfnSetIICSDA = Set_IIC_SDA;
    g_fnIIC.pfnGetIICSDA = Get_IIC_SDA;     
    g_fnIIC.pfnSetIICSCL = Set_IIC_SCL;
    g_fnIIC.pfnGetIICSCL = Get_IIC_SCL;

    g_at24cxx.nDeviceAddressBitsCount = AT24C08_DEVICE_ADDRESS_BITS_COUNT;
    g_at24cxx.nWordAddressBitsCount = AT24C08_WORD_ADDRESS_BITS_COUNT;
    g_at24cxx.nBytesPerPage = AT24C08_PAGE_SIZE;
    g_at24cxx.pfnIIC = &g_fnIIC;

    for (i=0; i<AT24C08_PAGE_SIZE; i++)
    {
        AT24CXX_ByteWrite(&g_at24cxx, AT24_FIRM_DEVICE_ADDRESS, i, i*2);
        //nData = AT24CXX_RandomtRead(&g_at24cxx, AT24_FIRM_DEVICE_ADDRESS, i);

    }
答 4: 这种做法可以是固定接口和协议这种做法可以是固定接口和协议，可以评比平台差异，便于移植。以上代码只是做很少修改就移植到51,AVR,ARM上，也就是实现了几个PIN口操作的函数。这种情况下，C++没有优势。不同平台C++的实现可能不一样，C++实现那一块是黑盒，自己管控不了。另外，C++并不是所有的mcu的编译器都支持。我一直在用VC,但在写mcu程序时，还是偏向c,以c++的思想或接口的思想去使用c.除非mcu有N大的ROM和RAM. 答 5: 还可以实现COM接口呢. 创建实例,通过虚表调用.