Common request requirements

All the requests require a RCCHeader structure that is defined as the first structure in the RequestResponseBuffer storage area that is passed as input to the request. You must set the following fields in the RCCHeader before invoking a request:

RCHREye
RCHRVer
RCHRRequest - Set this field to the request constant.
RCHRLen
RCHRNum

Table 1 shows the RCCHeader layout of these fields. The RCHRToken field is returned by the RCCOpen request and must be provided in the RCCHeader structure that is specified as input to all other requests. The RCCHeader structure is followed by one or more additional structures that are specific to the request.

Table 1. RCCHeader structure
Offset	Field	Length	Format	Description
0(X'0')	RCHREye	4	EBCDIC	RCHR eyecatcher
4(X'4')	RCHRVer	1	Binary	Version
5(X'5')	RCHRRequest	1	Binary	Request type: 1 - RCCOpen 2 - RCCSetFilters 3 - RCCStart 4 - RCCGetRecords 5 - RCCStop 6 - RCCClose
6(X'6')	RCHRLen	2	Binary	Length of RCCHeader structure
8(X'8')	RCHRNum	2	Binary	Number of additional input structures. This value does not include the RCCHeader structure.
10(X'A')		6	Binary	Reserved
16(X'10')	RCHRToken	16	Binary	Token that is returned by the RCCOpen request
32(X'20')		16	Binary	Reserved