在Loadrunner中提供了C对字符串出了的相关功能函数，如下：

lr_save_datetime	把当前日期和时间保存到一个参数中
lr_save_int	把一个整数保存为参数
lr_save_searched_string	保存一个字符数组相对于字符串出现的部分。
lr_save_string	把一个字符串保存到参数中
lr_save_var	把字符串的一部分内容保存为参数
lr_eval_string	返回参数的实际内容或返回一个包含参数的字符串的实际内容

     下面我们将对这些函数作一一说明，并举例实践。

void lr_save_datetime(const char *format, int offset, const char *name);

参数解释： 

format	所检索的日期/时间信息的格式
offset	当前日期和时间的偏移量, 采用形式有: DATE_NOW, TIME_NOW, ONE_DAY, ONE_HOUR, ONE_MIN. 例如： TIME_NOW + ONE_HOUR
name	保存的参数名称，用来存储日期/时间信息。

例子：

Action()

{

lr_save_datetime(

"

Tomorrow is %B %d %Y

"

, DATE_NOW

+

ONE_DAY,

"

next

"

);

lr_output_message(lr_eval_string(

"

{next}

"

));

return

0

;

}

运行结果为：

Running Vuser...

Starting iteration 1.

Starting action Action.

Action.c(5): Tomorrow is 七月 06 2011

Ending action Action.

Ending iteration 1.

Ending Vuser...

int lr_save_int ( int value, const char *param_name);

参数解释： 

value	将要保存到参数得整数值
param_name	保存的参数名称

例子：

Action()

{

int

num;

num

=

5

;

lr_save_int(num

*

2

,

"

param1

"

);

lr_output_message(lr_eval_string(

"

{param1}

"

));

return

0

;

}

运行结果为：

Running Vuser...

Starting iteration 1.

Starting action Action.

Action.c(6): 10

Ending action Action.

Ending iteration 1.

Ending Vuser...

int lr_save_searched_string (const char *buffer, long buf_size, unsigned int occurrence, const char *search_string, int offset, unsigned int string_len, const char *parm_name );

参数解释：

buffer	The STRING or CARRAY buffer, part of whose contents you want to save.
buf_size	The buffer size.
occurrence	The occurrence number of the search_string (0-based count). For example, if the search_string occurs three times, and you want the second occurrence, set occurrence to 1.
search_string	The string to search for in the buffer.
offset	The number of characters to skip after the end of the search string occurrence.
string_len	The number of characters to save.
parm_name	Parameter name to be used in subsequent lr statements to refer to the saved information. Name is enclosed in double-quotes.

例子：

Action()

{

char

cBuff[]

=

"

abc Emma Woodhouse abc Elizabeth Bennet abc William Price

"

;

lr_save_searched_string(cBuff, strlen(cBuff),

2

,

"

abc

"

,

//

Search for third occurrence of "abc"

1

,

//

Skip the space after "abc"

4

,

//

Put the next four characters...

"

Fannys_brother

"

);

//

... in parameter Fannys_brother.

lr_output_message(

"

%s

"

,lr_eval_string(

"

Fannys_brother={Fannys_brother}

"

));

return

0

;

}

运行结果为：

Running Vuser...

Starting iteration 1.

Starting action Action.

Action.c(9): Fannys_brother=Will

Ending action Action.

Ending iteration 1.

Ending Vuser...

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

int lr_save_var (const char *param_value, unsigned long const value_len, unsigned long const options, const char *param_name);

char *lr_eval_string (const char *instring );

     以上三个函数我们经常会用在一起。例如：

例子：

Action()

{

lr_save_string(

"

testaaaab

"

,

"

InName

"

);

lr_output_message(

"

%d

"

,strlen(

"

{InName}

"

));

lr_output_message(

"

%d

"

,strlen(

"

{InName}

"

)

-

1

);

lr_save_var( lr_eval_string(

"

{InName}

"

),

strlen(

"

{InName}

"

)

-

1

,

0

,

"

ShortName

"

);

lr_output_message(

"

%s

"

,lr_eval_string(

"

ShortName={ShortName}

"

));

lr_output_message(

"

ShortName=%s

"

,lr_eval_string(

"

{ShortName}

"

));

return

0

;

}

Starting iteration 1.

Starting action Action.

Action.c(5): 8

Action.c(6): 7

Action.c(9): ShortName=testaaa

Action.c(10): ShortName=testaaa

Ending action Action.

Ending iteration 1.

      *****注：在loadrunner中，字符串处理函数用的比较多，其用法也比较简单。多加以练习操作，在项目实践中可以很快的做到得心应手。*****