字节对齐问题

要设置一个结构体的对齐问题，使用如下方式：

#pragma pack(1)  //设置开始使用字节对齐
typedef struct
{
char chRIFF[4];
unsigned int  total_Len;
char chWAVE[4];
char chFMT[4];
unsigned int  dwFMTLen;
unsigned short fmt_pcm;
unsigned short  channels;
unsigned int fmt_samplehz;
unsigned int fmt_bytepsec;
short fmt_bytesample;
unsigned short fmt_bitpsample;
char chDATA[4];
unsigned int  dwDATALen;
}WaveHeader;
#pragma pack()  //设置结束使用字节对齐