LoadRunner截取字符串操作
在使用LoadRunner winsockets协议写脚本，遇到下面问题：
在接收到的查询数据库的结果中我要取红色部份用于下面的select
recv buf60 769
"x01x00x00x01"
"K"
"x00x00x02x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfofTskGuidebookfTskGuidebookf?"
"x00"
"v"
"x00x00x00x03"
" "
"x00x00x00x00"
"A"
"x00x00x03x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfo"
"x07"
"Work_ID"
"x07"
"Work_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"G"
"x00x00x04x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfo
"
"WorkNum_ID
"
"WorkNum_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"I"
"x00x00x05x03"
"def system_db"
"x10"
"tb_tskdetailinfo"
"x10"
"tb_tskdetailinfoBatch ID"
"x02"
"IDf?"
"x00"
"v"
"x00x00x00x03"
"!"
"x00x00x00x00"
"Q"
"x00x00x06x03"
"def system_db"
"x10"
"tb_tskdetailinfo"
"x10"
"tb_tskdetailinfo BatchName BatchNamef!"
"x00"
","
"x01x00x00xfdx00x00x00x00x00"
"C"
"x00x00x07x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfoBlock_IDBlock_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"I"
"x00x00"
""
"x03"
"def system_dbftb_blockinfoftb_blockinfo BlockName BlockNamef!"
"x00x96x00x00x00xfdx00x00x00x00x00"
"G"
"x00x00"
" "
"x03"
"def system_dbftb_blockinfoftb_blockinfoModel_IDModel_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00x05x00x00"
"
"
"xfex00x00"
"""
"x00x15x00x00"
"v"
"x01"
"5"
"x01"
"4"
"x01"
"7"
"x01"
"7"
"x04"
"8227"
"x01"
"6"
"x03"
"DAY"
"x01"
"3"
"x15x00x00"
"f"
"x01"
"5"
"x01"
"4"
"x01"
"7"
"x01"
"7"
"x04"
"8227"
"x01"
"5"
"x03"
"NEW"
"x01"
"3"
"x18x00x00"
"
"
"x01"
"6"
"x01"
"1"
"x01"
"5"
"x01"
"5"
"x04"
"0502"
"x01"
"4"
"x06"
"鏁板瓧"
"x01"
"2"
"x1ax00x00x0ex01"
"9"
"x01"
"1"
"x02"
"11"
"x02"
"11"
"x04"
"1601"
"x01"
"4"
"x06"
"鏁板瓧"
"x01"
"2"
"x1ax00x00x0fx01"
"9"
"x01"
"1"
"x02"
"11"
"x02"
"11"
"x04"
"1601"
"x01"
"1"
"x06"
"鍦板潃"
"x01"
"2"
"x05x00x00x10xfex00x00"
"""
"x00"
send buf61 54
"2"
"x00x00x00x03"
"select `BlockNO` from `tb_blockinfo` where `ID`=6"
写关联语句：
lrs_save_searched_string("socket3",NULL,"Block_ID","LB/BIN=\x01","RB/BIN=\x03",8,0,-1);
执行发现关联的值不对。检查，发现传回的结果为：
"x01x00x00x01"
"K"
"x00x00x02x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfofTskGuidebookfTskGuidebookf?"
"x00"
"v"
"x00x00x00x03"
" "
"x00x00x00x00"
"A"
"x00x00x03x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfoaWork_IDaWork_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"G"
"x00x00x04x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfo
"
"WorkNum_ID
"
"WorkNum_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"I"
"x00x00x05x03"
"def system_db"
"x10"
"tb_tskdetailinfo"
"x10"
"tb_tskdetailinfoBatch ID"
"x02"
"IDf?"
"x00"
"v"
"x00x00x00x03"
"!"
"x00x00x00x00"
"Q"
"x00x00x06x03"
"def system_db"
"x10"
"tb_tskdetailinfo"
"x10"
"tb_tskdetailinfo BatchName BatchNamef!"
"x00"
","
"x01x00x00xfdx00x00x00x00x00"
"C"
"x00x00"
"a"
"x03"
"def system_db
"
"tb_tsbinfo
"
"tb_tsbinfoBlock_IDBlock_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00"
"I"
"x00x00"
""
"x03"
"def system_dbftb_blockinfoftb_blockinfo BlockName BlockNamef!"
"x00x96x00x00x00xfdx00x00x00x00x00"
"G"
"x00x00"
" "
"x03"
"def system_dbftb_blockinfoftb_blockinfoModel_IDModel_IDf?"
"x00"
"v"
"x00x00x00x03x00x00x00x00x00x05x00x00"
"
"
"xfex00x00"
"""
"x00x16x00x00"
"v"
"x01"
"2"
"x01"
"3"
"x01"
"2"
"x01"
"2"
"x04"
"8227"
"x02"
"10"
"x03"
"TWO"
"x01"
"4"
"x15x00x00"
"f"
"x01"
"2"
"x01"
"3"
"x01"
"2"
"x01"
"2"
"x04"
"8227"
"x01"
"9"
"x03"
"ONE"
"x01"
"4"
"x18x00x00"
"
"
"x01"
"3"
"x01"
"1"
"x01"
"1"
"x01"
"1"
"x04"
"0001"
"x01"
"1"
"x06"
"鍦板潃"
"x01"
"2"
"x18x00x00x0ex01"
"3"
"x01"
"1"
"x01"
"1"
"x01"
"1"
"x04"
"0001"
"x01"
"4"
"x06"
"鏁板瓧"
"x01"
"2"
"x05x00x00x0fxfex00x00"
"""
"x00"
经观查是改变了
在
"x04"
"8227"
"x02"
"10"
中x04和x02表示的是后面字符的位数，如是一位就是x01，如是三位就是x03。
这个查表返回的结果中有8列，我要取的是第一行第六列的值。
观查后将关联语句改为：
lrs_save_searched_string("socket3",NULL,"Block_ID","LB/BIN=\v","RB/BIN=\r",7,0,-1);
取得结果为：
x012x013x012x012x048227x0210x03TWOx014x15x00x00fx012x013x012x012x048227x019x03ONEx014x18x00x00
我要取得的值在第六个“”后。写语句：
char *Block;
int i;
int k;
int len;//要取值的长度
char Block_str[100];
char Block_len[5];
Block=lr_eval_string("<Block_ID>");
for(k=1;k<=6;)
{
i=i+1;
if(Block[i]=='x')
k=k+1;
}
strncpy(Block_len,Block+i-1,4);
lrs_hex_string_to_int(Block_len,1,&len);
strncpy(Block_str,Block+i+3,s);
lr_output_message ("Block= %s",Block_str);
取得想要的结果。整理脚本如下：
char *Block;
int i;
int k;
int len;//要取值的长度
char Block_str[100];
char Block_len[5];
lrs_save_searched_string("socket3",NULL,"Block_ID","LB/BIN=\v","RB/BIN=\r",7,0,-1);
Block=lr_eval_string("<Block_ID>");
//取得第六个x的位置
for(k=1;k<=6;)
{
i=i+1;
if(Block[i]=='x')
k=k+1;
}
strncpy(Block_len,Block+i-1,4);//截/x开始四位
lrs_hex_string_to_int(Block_len,1,&len);//转为int
strncpy(Block_str,Block+i+3,s);
lr_output_message ("Block= %s",Block_str);
在往下的脚本编写过程中发现还需要类似的工作，直接写了个函数，如下：
//str,被查找的字符串；n,第几个;c查找的字符
char *strn(char *str,int n,char c){
int nlen;//要截取串的长度，十进制数
char rstr[30]="";//截取出的串
char *retu=NULL;//要返回的值
char str_nlen[5]="";//要截取串的长度，字符
int len=0;//str长度
int i=0;//第几位，计数
int k=1;//第几个，计数
// lr_output_message ("str= %s",str);
len=strlen(str);//取得str的长度
//查找第n个X的位置
for(k=1;k<=n;)
{
i=i+1;
if(str[i]==c)//判断字符是否为c
k=k+1;
if(i+3>len)
return 0;//找到末尾条件还是不满足，返回空
}
strncpy(str_nlen,str+i-1,4);//截取x0n,即我们所要取的值的长度，字符串
// lr_output_message ("str_nlen= %s",str_nlen);
lrs_hex_string_to_int(str_nlen,1,&nlen);//将str_len转为十进制数，放入len 中
// lr_output_message ("要截取的长度为= %d",nlen);
strncpy(rstr,str+i+3,nlen);//截取我们所需要的数据
// lr_output_message ("rstr为= %s",rstr);
retu=rstr;
return retu;
}
说一下strncpy函数，有两种格式
char *strncpy(char *dest, char *src, int n);
char *strncpy( strtemp,str+n , m )
--strtemp字符串变量,截取后的字符串存放处
--str 字符串变量,要截取的字符串
--n ,int 型,
-- str+n, 表示从第n 位开始截取字符串
--m,int型,表示截取m位