loadrunner字符串处理函数

     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。*****