ACE_InputCDR的数据对齐问题

zhanglm

测试程序如下

1. #include <ace/ACE.h>
2. #include <ace/CDR_Stream.h>
3. #include <ace/Message_Block.h>
4. #include <ace/Log_Msg.h>
5. #include <ace/OS.h>
6. #pragma pack(1)
7. typedef struct tagMsgHeader
8. {
9. unsigned int startFlag;
10. unsigned short bodyLength;
11. unsigned int messageSequence;
12. unsigned char messageCmdCode;
13. }MsgHeader;
14. #pragma pack()
15. int ACE_TMAIN(int, ACE_TCHAR *[])
16. {
17. MsgHeader h;
18. memset(&h, 0, sizeof(MsgHeader));
20. h.startFlag = 0xdbdbdbdb;
21. h.bodyLength = 0xeeff;
22. h.messageSequence = 0xadcdef;
23. h.messageCmdCode = 0x08;
25. int hlen = sizeof(h);
26. int slen = sizeof(MsgHeader);
28. ACE_InputCDR cdr((const char *)&h, sizeof(h));
29. ACE_CDR::ULong startFlag;
30. ACE_CDR::Short bodyLength;
31. ACE_CDR::ULong messageSequence;
32. ACE_CDR::Char messageCmdCode;
33. cdr >> startFlag;
34. cdr >> bodyLength;
35. cdr >> messageSequence;
36. cdr >> messageCmdCode;
38. MsgHeader h2;
39. h2.startFlag = startFlag;
40. h2.bodyLength = bodyLength;
41. h2.messageCmdCode = messageCmdCode;
42. h2.messageSequence = messageSequence;
43. return 0;
44. }

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调试时

1. cdr >> messageSequence;

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出现问题，得不到正确的结果0xadcdef，而是无效的0xcccccccc，跟踪进去，发电 good_bit()返回值为false，而

1. h2.messageSequence = messageSequence;

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却得到了messageCmdCode的首字节0xef,这是怎么回事？是不是在字节对齐方面ACE_InputCdr需要做特殊的处理？

yyi.mailer

:),在编译ACE时在config.h中加上‘#define ACE_LACKS_CDR_ALIGNMENT’