struct 转换为Byte？？？？

[wenlianjie]

typedef struct _Packet{
unsigned int a1; //2个字节
unsigned int a2; //2 个字节
unsigned int a3; //2 个字节
unsigned long a4; //4 个字节
unsigned short a5; //1 个字节
unsigned long a6; //4 个字节
} Packet,*PPacket;
int a1=1;
int a2=0;
int a3=15;
long a4=201;
short a5=1;
long a6=30;

怎么样将这些数据放到byte[15]里？？

[阿发伯]

Packet pack;
BYTE bytes[15];
memmove(byte, &pack, 15);

[阿发伯]

Packet pack;
BYTE bytes[15];
memmove(bytes, &pack, 15);

[僵哥]

[Quote=引用楼主 wenlianjie 的帖子:]
typedef struct _Packet{
unsigned int a1; //2个字节
unsigned int a2; //2 个字节
unsigned int a3; //2 个字节
unsigned long a4; //4 个字节
unsigned short a5; //1 个字节
unsigned long a6; //4 个字节
} Packet,*PPacket;
int a1=1;
int a2=0;
int a3=15;
long a4=201;
short a5=1;
long a6=30;

怎么样将这些数据放到byte[15]里？？
[/Quote]
用的是什么编译器？Turbo C 2.0吗？

[wenlianjie]

a1=1;
senddata[0]=a1;
a1=1;
senddata[1]=(byte)a1<<8;
senddata[2]=(byte)a1;
a1=0;
senddata[3]=(byte)a1<<8;//////到这儿就赋不上值了？？？？？？？？？？？
senddata[4]=(byte)a1;
a1=a2=32;
a2>>=8;
senddata[5]=a1;
senddata[6]=a2;
a1=a2=66;
senddata[7]=a1;
a1=100;
senddata[8]=a1;
a1=a2=168;
senddata[9]=a1;
a1=a2=192;
senddata[10]=a1;
a1=1;
senddata[11]=a1;
a1=0;
senddata[12]=a1;
senddatastr="2008-07-18 11:24:55";
a1=StrLen(senddatastr.c_str());
senddata[13]=(a1 & 0x000000FF);
senddata[14]=(a1 & 0x0000FF00)>>8;
senddata[15]=(a1 & 0x00FF0000)>>16;
senddata[16]=(a1 & 0xFF000000)>>24;
mpt=new byte[a1];
strcpy((char*)mpt,senddatastr.c_str());
strcat(senddata,mpt);

[sterrys]

pack(1)

memcpy

[whomin]

疑问：unsigned int 我怎么记得应该是4个字节才对？

[僵哥]

用sizeof(Packet)测一下也就知道这个结构占多少字节了.

[CamelFang]

[Quote=引用 4 楼 wenlianjie 的回复:]
a1=1;
senddata[0]=a1;
a1=1;
senddata[1]=(byte)a1 < <8;
senddata[2]=(byte)a1;
a1=0;
senddata[3]=(byte)a1 < <8;//////到这儿就赋不上值了？？？？？？？？？？？
senddata[4]=(byte)a1;
a1=a2=32;
a2>>=8;
senddata[5]=a1;
senddata[6]=a2;
a1=a2=66;
senddata[7]=a1;
a1=1…
[/Quote]

这一个一个的赋值多累啊.
还是用memcpy吧.

[jacknes009]

memcpy

[sunyuchuan86]

study !

[cppowner]

Packet pack;
BYTE bytes[15];
memmove(bytes, &pack, 15);

[whomin]

嗯，方法应该是直接用memcpy比较方便，
问题是Packet结构的长度并不是15字节，
unsign int、unsigned short、unsigned long的具体长度跟编译器相关的，你可以在自己机器上用sizeof()函数测试下。
一般32位系统情况下int和long是一样的为4字节，short为2字节

[leeicescri]

你那个15个字节的长度是怎么算出来的？
32位系统里
unsigned int、unsigned long是4个字节
unsigned short是2个字节
所以
typedef struct _Packet{
unsigned int a1; //4个字节
unsigned int a2; //4 个字节
unsigned int a3; //4 个字节
unsigned long a4; //4 个字节
unsigned short a5; //2 个字节
unsigned long a6; //4 个字节
} Packet,*PPacket;
最少也要22字节

16位系统里
unsigned long是4个字节
unsigned int、unsigned short是2个字节
所以
typedef struct _Packet{
unsigned int a1; //2个字节
unsigned int a2; //2 个字节
unsigned int a3; //2 个字节
unsigned long a4; //4 个字节
unsigned short a5; //2 个字节
unsigned long a6; //4 个字节
} Packet,*PPacket;
最少也要18个字节

[Jonix]

[Quote=引用 10 楼 sterrys 的回复:]
pack(1)

memcpy
[/Quote]

只有这位仁兄简洁明了的回答是有效的

[痞子酷]

memcpy

[laowang2]

upup

[支持中文哦]

用联合内嵌这个结构，不就行了？
union myunion{
struct {
DWORD i;
DWORD j;
};
BYTE buff[8];
};