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1、ISO8583报文协议详解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。8583包前面一段为位图，用来确定包的字段域组成情况。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。1、位图描述如下：位图位置：1格式：定长类型：B16（二进制16位，16*8=128bit）描述：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）。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
2、'1'。选用条件：如使用65到128域，需设位图域第一位为'1'2、每个域的定义如下：typedefstructISO8583{intbit_flag;/*域数据类型0--string,1--int,2--binary*/char*data_name;/*域名*/intlength;/*数据域长度*/intlength_in_byte;/*实际长度（如果是变长）*/intvariable_flag;/*是否变长标志0：否2：2位变长,3：3位变长*/intdatatyp;/*0--string,1--int,2--binary*/char*data;/*存放具体值*/inta
3、ttribute;/*保留*/}ISO8583;ISO8583Tbl8583[128]={/*FLD1*/{0,"BITMAP,EXTENDED",8,0,0,2,NULL,0},/*FLD2*/{0,"PRIMARYACCOUNTNUMBER",22,0,2,0,NULL,0},/*FLD3*/{0,"PROCESSINGCODE",6,0,0,0,NULL,0},/*FLD4*/{0,"AMOUNT,TRANSACTION",12,0,0,1,NULL,0},/*FLD5*/{0,"NOUSE",12,0,0,0,NULL,0},/*FLD6*/{0,"NOUSE",12
4、,0,0,0,NULL,0},/*FLD7*/{0,"TRANSACTIONDATEANDTIME",10,0,0,0,NULL,0},/*FLD8*/{0,"NOUSE",8,0,0,0,NULL,0},/*FLD9*/{0,"NOUSE",8,0,0,0,NULL,0},/*FLD10*/{0,"NOUSE",8,0,0,0,NULL,0},/*FLD11*/{0,"SYSTEMTRACEAUDITNUMBER",6,0,0,1,NULL,0},/*FLD12*/{0,"TIME,LOCALTRANSACTION",6,0,0,0,NULL,0},/*FLD13*/{0,
5、"DATE,LOCALTRANSACTION",4,0,0,0,NULL,0},/*FLD14*/{0,"DATE,EXPIRATION",4,0,0,0,NULL,0},/*FLD15*/{0,"DATE,SETTLEMENT",4,0,0,0,NULL,0},/*FLD16*/{0,"NOUSE",4,0,0,0,NULL,0},/*FLD17*/{0,"DATE,CAPTURE",4,0,0,0,NULL,0},/*FLD18*/{0,"MERCHANT'STYPE",4,0,0,0,NULL,0},/*FLD19*/{0,"NOUSE",3,0,0,0,NULL,0}
6、,/*FLD20*/{0,"NOUSE",3,0,0,0,NULL,0},/*FLD21*/{0,"NOUSE",3,0,0,0,NULL,0},/*FLD22*/{0,"POINTOFSERVICEENTRYMODE",3,0,0,0,NULL,0},/*FLD23*/{0,"NOUSE",3,0,0,0,NULL,0},/*FLD24*/{0,"NOUSE",3,0,0,0,NULL,0},/*FLD25*/{0,"POINTOFSERVICECONDITIONCODE",2,0,0,0,NULL,0},/*FLD26*/{0,"NOUSE",2,0,0,0,NULL,0
7、},/*FLD27*/{0,"NOUSE",1,0,0,0,NULL,0},/*FLD28*/{0,"field27",6,0,0,0,NULL,0},/*FLD29*/{0,"NOUSE",8,0,1,0,NULL,0},/*FLD30*/{0,"NOUSE",8,0,1,0,NULL,0},/*FLD31*/{0,"NOUSE",8,0,1,0,NULL,0},/*FLD32*/{0,"ACQUIRERINSTITUTIONID.CODE",11,0,2,0,NULL,0},/*FLD33*/{0,
