C语言数据类型转换

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/*– shortTofloat – **/
//shortToFloat(xiebo_tmp)
// unsigned short xiebo_tmp[2];

float shortToFloat(unsigned short *xiebo_short_tmp)
{
char pchar[4];
//小端模式
pchar[1] = (xiebo_short_tmp[0]>>8) & 0xff;
pchar[0] = xiebo_short_tmp[0] & 0xff;
pchar[3] = (xiebo_short_tmp[1]>>8) & 0xff;
pchar[2] = xiebo_short_tmp[1]& 0xff;
return ((float )pchar);
}

/Long to byte/
//LongToByte(xuliangcurtime, &buf[index]);
// long xuliangcurtime,char *buf;
void LongToByte(long L, unsigned char* byteArry)
{
if(bigorlittle == 0) //小端模式
{
byteArry[1] = L & 0xff;
byteArry[0] = (L >> 8) & 0xff;
byteArry[3] = (L >> 16) & 0xff;
byteArry[2] = (L >> 24) & 0xff;
}
else if(bigorlittle == 1)
{
byteArry[3] = L & 0xff;
byteArry[2] = (L >> 8) & 0xff;
byteArry[1] = (L >> 16) & 0xff;
byteArry[0] = (L >> 24) & 0xff;
}
}

/byte to long /
//ByteToLong(&lg_tmp, &buf[index]);
void ByteToLong(long L, unsigned char byteArry)
{
if(bigorlittle == 0) //小端模式
{
*L = byteArry[2] << 24 | byteArry[3] << 16 | byteArry[0] << 8 | byteArry[1];
}
else if(bigorlittle == 1)
{
*L = byteArry[0] << 24 | byteArry[1] << 16 | byteArry[2] << 8 | byteArry[3];
}
}

// DspFloatToChar(1.0, dspjz);
// unsigned char dspjz[4];

void DspFloatToChar(float F, unsigned char * byteArry)
{
char * pchar = (char *)&F;

byteArry[0] = *pchar;pchar++;byteArry[1] = *pchar;pchar++;byteArry[2] = *pchar;pchar++;byteArry[3] = *pchar;

}

/****/
//ByteToFloat(buf_tmp); char buf_tmp[4];

float ByteToFloat(unsigned char* byteArry)
{
char pchar[4];

if(bigorlittle == 0)        //小端模式{    pchar[0] = byteArry[1];    pchar[1] = byteArry[0];    pchar[2] = byteArry[3];    pchar[3] = byteArry[2];    return *((float *)pchar);}else if(bigorlittle == 1){    pchar[0] = byteArry[3];    pchar[1] = byteArry[2];    pchar[2] = byteArry[1];    pchar[3] = byteArry[0];    return *((float *)pchar);}

}

/*****/
// FloatToByte(boxingf1[i + j], &buf[j * 4]);
// float * boxingf1; //波形数据转换为浮点型指针 char * buf)

void FloatToByte(float F, unsigned char* byteArry)
{
char * pchar = (char *)&F;

if(bigorlittle == 0)        //小端模式{    byteArry[1] = *pchar;pchar++;    byteArry[0] = *pchar;pchar++;    byteArry[3] = *pchar;pchar++;    byteArry[2] = *pchar;}else if(bigorlittle == 1){    byteArry[3] = *pchar;pchar++;    byteArry[2] = *pchar;pchar++;    byteArry[1] = *pchar;pchar++;    byteArry[0] = *pchar;}

}

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