下面得语句什么意思,为什么每一航都加"\"

[shaxiren]

//校验输入参数的长度
#define CHECK_BUFFER_LEN(fldid,len) \
{ \
if (strlen(Buf.fnGets(fldid)) > len) \
{ \
Buf(ERRNO,0) = (long)-3; \
Buf(ERRINFO,0) = "系统故障![交易参数长度不正确]"; \
tpreturn(TPFAIL,-1,(char*)rqst->data,0,0); \
} \
}

//总控返回
#define RETURN_CTRL() \
{ \
if (iRet < 0) \
{ \
if (tpurcode < 0) \
tpreturn(TPFAIL,-1,(char*)Buf.fnGetBuffer(),0,0); \
else \
{ \
Buf(ERRNO,0) = (long)-4; \
Buf(ERRINFO,0) = "系统故障![服务不存在或者进程已经退出!]"; \
tpreturn(TPFAIL,-1,(char*)Buf.fnGetBuffer(),0,0); \
} \
} \
else \
tpreturn(TPSUCCESS,0,(char*)Buf.fnGetBuffer(),0,0); \
}

[wbh0360]

因为这是宏，应该写在同一行，
但写不下，只好用“\”来连接上下行了。

[bigdoors]

yes

[yjh1982]

同意

[cxjddd]

\是宏里的连接符