lr_eval_string;sprintf;lr_save_string;用法

一、lr_save_string 使用介绍
1.该函数主要是将程序中的常量或变量保存为lr中的参数。
格式：

//将常量保存为参数
lr_save_string("777","page");
web_url(http://www.sina.com.cn/{page});
lr_eval_string("{page}");
//将变量保存为参数,tmp为变量
lr_save_string(tmp,"page");
web_url(http://www.sina.com.cn/{page});
lr_eval_string("{page}");

二、sprintf函数

 

定义函数	int sprintf( char *str,const char * format,.........);
函数说明	sprintf()会根据参数format字符串来转换并格式化数据，然后将结果复制到参数str所指的字符串数组，直到出现字符串结束(’\0’)为止。关于参数format字符串的格式请参考printf()。
返回值	成功则返回参数str字符串长度，失败则返回-1，错误原因存于errno中。
附加说明	使用此函数得留意堆栈溢出，或改用snprintf（）。
范例	#include<stdio.h> main() { char * a=”This is string A!”; char buf[80]; sprintf(buf,”>>> %s<<<\n”,a); printf(“%s”.buf); }
执行	>>>This is string A!<<<

常用该函数代替itoa，将整数格式化为字符串形式。
如：

int page=0;
char page_ch[56];
page=page + 10;
sprintf(page_ch,"%d",page);

 

 

 

lr_eval_string

用于返回instring参数中的实际字符串值，可以使用该函数来查看参数化取值是否正确

example:
int count;
web_reg_save_param("flight_num",
"LB=新",
"RB=闻",
"ORD=All",
LAST);
count=atoi(lr_eval_string("{flight_num_count}"));

//sprintf

The following example uses sprintf to write the name of a file to a string buffer, filename. This name is made up of the word "log", an underscore, the value of i, and the file suffix.
example:
Action()
{
int index = 56;
char filename[64], *suffix = "txt";

sprintf(filename, "log_%d.%s", index, suffix);
lr_output_message("The new file name is %s", filename);

return 0;
}
Output:
Action.c(9): The new file name is log_56.txt
//
lr_save_string

Saves a null-terminated string to a parameter.

int lr_save_string (const char *param_value, const char *param_name);

aram_value The value to assign to the parameter.
param_name The name of the parameter.

The lr_save_string function assigns the specified null-terminated string to a parameter. This function is useful in correlating queries. To determine the value of the parameter, use the lr_eval_string function.

example:
lr_save_string("777", "emp_id");

///
#include "as_web.h"

Action()
{

int i;
int count;
char param[10][20];

web_reg_save_param("flight_num",
"LB=新",
"RB=闻",
"ORD=All",
LAST);

web_add_cookie("BAIDUID=643CC8042E92F7FB5EF83827498BDBDC:FG=1; DOMAIN=www.baidu.com");

web_add_cookie("BDSTAT=495409234680ac099258d109b3de9c82d158ccbf6f81800a19d8bc3eb035a10e; DOMAIN=www.baidu.com");

web_add_header("Accept-Language",
"zh-cn");

web_url("www.baidu.com",
"URL=http://www.baidu.com/",
"Resource=0",
"RecContentType=text/html",
"Referer=",
"Snapshot=t1.inf",
"Mode=HTML",
LAST);

count=atoi(lr_eval_string("{flight_num_count}"));
lr_error_message("已经数量:%d",count);
for(i=1;i<=count;i++)
{
sprintf(param[i],"{flight_num_%d}",count);
lr_error_message(param[i]);
}
for(i=1;i<count;i++)
{
lr_error_message(lr_eval_string(param[i]));
}

return 0;
}