数值与字符的互转

1.10进制数值转换为2个字节的16进制字符

void DecTo2Hex(int dec,char *data)
{
    *(data+0) = ((dec >> 8) & 0XFF);
    *(data+1) = dec & 0XFF;
}

int _tmain(int argc, _TCHAR* argv[])
{
    int iDec = 26;
    char data[2] = {0};
    DecTo2Hex(iDec,data); //调试过程中得到data为0x01a
    return 0;     
}

2.10进制数值转换为4个字节的16进制字符

void DecTo4Hex(int dec,char *data)
{
    *(data+3) = ((dec >> 24) & 0XFF);
    *(data+2) = ((dec >> 16) & 0XFF);
    *(data+1) = ((dec >> 8) & 0XFF);
    *(data+0) = dec & 0XFF;
}
int _tmain(int argc, _TCHAR* argv[])
{
    int iDec = 1024;
    char data[4] = {0};
    DecTo4Hex(iDec,data);
    return 0;     
}

3.16进制字符串转成16进制数值

int _tmain(int argc, _TCHAR* argv[])
{
    //2位
    char Data[2]  = {0x01,0x01};     
    int Val = ((unsigned char)Data[0] << 8)  + (unsigned char)Data[1];
    //4位
    char cData[4]  = {0x10,0x01,0x01,0x01};     
    int iVal = ((unsigned char)cData[0] << 24) + ((unsigned char)cData[1] << 16) + ((unsigned char)cData[2] << 8) + (unsigned char)cData[3];

    return 0;     
}