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SAP RFC SDK 指南：跨语言调用关键文档

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"SAP RFC guid 指引是SAP公司发布的一份关于RFC函数库的详细指导文档，适用于各种编程语言的调用。该文档主要用于帮助开发人员理解和使用SAP Remote Function Call (RFC) 技术，以便于在不同系统之间实现数据交互和集成。RFC SDK Guide涵盖了SAP Release 6.40版本的相关信息，同时警告内容可能随时间更新，未经SAP AG许可，不得复制或传播。文档中还提到了其他软件供应商的组件，如微软、IBM和Oracle的产品，显示了SAP与多种技术生态系统的兼容性。" SAP RFC（Remote Function Call）是SAP提供的一种通信协议，允许外部系统与SAP系统进行双向通信。通过RFC，非SAP系统可以调用SAP系统中的功能模块，执行业务逻辑，获取或更新数据。RFC技术广泛应用于企业系统集成、自动化流程和跨系统数据交换。这份RFC SDK指南详细阐述了如何在不同编程环境中设置和使用RFC库。开发人员可以学习如何配置RFC连接、创建RFC客户端和服务器端的接口、处理RFC调用中的错误以及安全性和性能优化等方面的知识。例如，对于.NET开发者，他们可以通过SAP .NET Connector来调用RFC函数；对于Java开发者，可以使用JCo (Java Connector) 来实现相同功能。文档中还可能包含具体的代码示例，展示了如何在实际项目中应用RFC技术。此外，由于涉及到与其他软件厂商的组件集成，比如IBM的DB2数据库、Oracle数据库等，文档中也可能会涵盖这些集成的细节，包括数据访问、事务处理和性能调优策略。 "SAP RFC guid 指引"是开发者进行SAP系统集成工作的关键参考资料，它提供了全面的RFC函数库使用指南和最佳实践，帮助开发者高效地利用SAP RFC技术实现跨系统的数据交互和功能调用。

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SAP AG

Call a RFC function

There are four kinds of results of an RFC-call:

1. Successful. In this case exporting data and tables were transported to remote

system and the local system received the importing data and tables.

2. Exception. In this case the callee (remote system) raised an application

exception. This means that:

• The exporting data has been transferred to the remote system.

• Remote function raised an application exception.

• Exception has been transferred to the caller.

• The importing data was not transferred to caller (local system).

• RFC connection is not closed.

3. System Exception. A system exception was raised by runtime. Connection is

closed.

4. Failure. Call unsuccessful. Connection is closed. No warranty for data

transport neither to remote system nor from remote system.

Important: Every call of any RFC function has to be conducted via a valid RFC

handle. It is recommended to call RfcClose after each failure of an RFC call.

A RFC call can be performed as blocked or unblocked call. The blocked call waits

until the called ABAP/4 function module is finished on the server side before it

returns to the program. By an unblocked call one has the possibility to execute some

code at client side at the same time the ABAP/4 function module is execute on the

server.

It follows a flow diagram showing the basic structure of a RFC client program.

SAP RFCSDK Guide

SAP AG

Open a RFC connection

RfcOpenEx()

Call a function and receive the

return values in one step

RfcCallReceiveEx()

Call an ABAP/4 function module

RfcCallEx()

Listen for incoming RFC events

RfcListen()

Receive the return values

RfcReceive()

Close the RFC connection

RfcClose()

succeed

Return value

RFC_RENTRY

RFC_OK

yes

Return value

RFC_OK

else

Return value

RFC_OK

else

Return value

RFC_OK

else

Error handling

Get error information

RfcLastErrorEx()

else

unblocked RFC calls blocked RFC calls

Flow diagram for a RFC client program without call-back.

Blocking RFC Calls

The API RfcCallReceiveEx implements the whole part of an RFC call, i.e., the

exporting and changing data are already sent to the RFC server and importing and

changing data are already received if the API returns.

Example:

int main (itn argc, rfc_char_t ** argv)

{

RFC_HANDLE handle;

RFC_RC rfc_rc;

RFC_ERROR_INFO_EX error_info_ex;

rfc_char_t * exception = NULL;

SAP RFCSDK Guide

SAP AG

rfc_char_t function_name[] = “ABC”;

RFC_PARAMETER importing[2],

exporting[2],

changing[2];

RFC_TABLES tables[2];

RFC_INT value1;

handle = RfcOpenEx (« « , &error_info_ex);

if (handle == RFC_HANDLE_NULL)

{

/* Could not establish an rfc connection */

...

return 1;

}

importing[0].name = “VALUE1”

importing[0].nlen = strlen (importing[0]. name);

importing[0].type = RFCTYPE_INT;

importing[0].addr = &value1;

importing[0].size = sizeof (value1);

importing[1].name = NULL;

rfc_rc = RfcCallReceiveEx (handle, function_name,

importing, exporting,

changing, tables,

&exception);

if (rfc_rc == RFC_EXCEPTION)

{

/* Catch an application exception.

No data were transported. Rfc connection

is not closed. */

printf (“Exception raised: %s\n”, exception);

}

else if(rfc_rc == RFC_SYS_EXCEPTION)

{

/* System exception raised. No data were transported.

Connection is closed by rfc runtime. */

printf (“System Exception raised: %s\n”, exception);

printf (“RFC connection closed by runtime\n”);

}

else if(rfc_rc != RFC_OK)

{

/* An error occurred */

RfcClose (handle);

...

SAP RFCSDK Guide

剩余74页未读，继续阅读

关于如何使用rfc sdk的c++实例

关于SAP的rfc c++ 调用建议大家不要使用rfcsdk,使用nwrfcsdk,实在是太过复杂，返回的参数是按行存储的字符串，要根据字段的长度分拆得到结果，nwrfc sdk是根据字段名来得到结果。鉴于最近一直在百度贴吧私信我关于如何使用rfc sdk,我把我之前做的测试贴出来，但是首先说明的是，这个例子，可以成功登陆SAP，但是进入后调用rfc func一直报错，一直解决不了，鉴于前面所述的复杂原因，以及项目的紧急，我就改用nwrfcsdk. 另外附件中已含rfcsdk和nwrfcsdk我之前测试的例子。

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