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<div class="tit">ISO8583 (简称8583包)</div>
<div class="date">2008年08月19日 星期二 下午 04:22</div>
<table style="table-layout: fixed;"><tbody><tr><td><div id="blog_text" class="cnt">ISO8583包(简称8583包)是一个国际标准的包格式,最多由128个字段域组成,每个域都有统一的规定,并有定长与变长之分。<br>
8583包前面一段为位图,用来确定包的字段域组成情况。 <br>
其中位图是8583包的灵魂,它是打包解包确定字段域的关键, 而了解每个字段域的属性则是填写数据的基础。 <br>
1、 位图描述如下: <br>
位图位置:1 <br>
格式:定长 <br>
类型:B16(二进制16位,16*8=128bit) <br>
描述: <br>
如将位图的第一位设为'1',表示使用扩展位图(128个域),否则表示只使用基本位图(64个域)。 <br>
如使用某数据域,应在位图中将相应的位设位'1',如使用41域,需将位图的41位设为'1'。 <br>
选用条件:如使用65到128域,需设位图域第一位为'1' <br>
2、每个域的定义如下: <br>
typedef struct ISO8583 <br>
{ <br>
int bit_flag; /*域数据类型0 -- string, 1 -- int, 2 -- binary*/ <br>
char *data_name; /*域名*/ <br>
int length; /*数据域长度*/ <br>
int length_in_byte;/*实际长度(如果是变长)*/ <br>
int variable_flag; /*是否变长标志0:否 2:2位变长, 3:3位变长*/ <br>
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