ALE,RFC和CPI-C之间的关系

sap的数据交换接口有三种： ALE application link enabling,RFC remoting funcation call 和CPI-C Common Programming Interface Communications 。它们之间的关系如下图：
                     -----------------------------
　                 |           ALE                   |
                      -----------------------------
        ---------------------------------------------
         |                RFC                                 |
         --------------------------------------------
  --------------------------------------------------------
  |                    CPI-C                                           |
  ---------------------------------------------------------
ALE是架构在RFC和IDOC技术上来完成数据通信交换.
RFC是架构在CPI-C接口之上，RFC的调用都将转换为CPI-C的调用完成.
CPI-C是数据交换的最基本接口,他使用复杂,一般情况不用,它只有在以下特殊情况下才被采用:
客户的系统平台不支持RFC
旧系统必须使用CPI-C作通信接口
系统需要复杂的通信协议
相关TCODE:
SM59 : 配置通讯
SM58: 察看RFC的LUW
SMQ1:Monitor RFC Queue
SARFC:Monitor RFC Resources on the Application Server
SMQR:
SMQS:
SMQ1:
SMQ2:
相关表:
RFCDEC:为远程功能调用的目的表
ARFCSSTATE and ARFCSDATA
TRFCQOUT  and TRFCQIN

相关package: SRFC
几个重要的样例:
·                               RSTRFCT0, RSTRFCT1, RSTRFCT2, and RSTRFCT3 are sample or test programs for qRFC with send queue. 相关函数:
·                               RSTRFCQ1, RSTRFCQ2, RSTRFCQ3, and RSTRFCQ4 you can stop processing one or more queues, continue processing with or without condition, or query the status of a queue.
START_OF_BACKGROUNDTAST:
TRFC_SET_QUEUE_NAME
TRFC_SET_QUEUE_RECEIVER_LIST (inbound queue)
TRFC_SET_QUEUE_NAME_LIST (outbound queue)
用户权限对象: S_RFC


转自：http://www.cnblogs.com/msng/archive/2007/08/20/862371.html