[转]Loadrunner的字符串处理函数

转自:http://blog.csdn.net/gzh0222/article/details/6948090
1)strcat

  char *strcat ( char *to, const char *from );
功能:链接两个字符串。

例子:
这个例子是用strcat链接字符串:Cheers_Lee和 @hotmail.com

  脚本如下:
char test[1024], *a = “@hotmail.com”;
strcpy(test, “Cheers_Lee”);
strcat(test, a);
lr_output_message(“We can see %s”,test);

运行后在executon log中看到如下语句:
Starting action Action.
Action.c(16): We can see Cheers_Lee@hotmail.com

2)strchr

  char *strchr ( const char *string, int c );
功能:返回字符串中指定字符后面的字符串。例子:
这个例子是返回第一个出现e字符以后所有的字符,和最后一次出现e字符以后所有的字符。

脚本如下:
char *string = “Cheers is a tester”;
char *first_e, *last_e;
first_e = (char *)strchr(string, ‘e’);
lr_output_message(“We can see the first occurrence of e: %s”,first_e);
last_e = (char *)strrchr(string, ‘e’);
lr_output_message(“We can see the last occurrence of e: %s”, last_e);

运行后在executon log中看到如下语句:

Starting action Action.
Action.c(12): We can see the first occurrence of e: eers is a tester
Action.c(14): We can see the last occurrence of e: er

3)Strcmp&stricmp

  int strcmp ( const char *string1, const char *string2 );大小写敏感。
int stricmp ( const char *string1, const char *string2 );大小写不敏感。
功能:比较字符串。

  例子:
按是否区分大小写对比两个字符串,并打印出它们的大小关系。

脚本如下:
int result;
char tmp[20];
char string1[] = “We can see the string:Cheers”;
char string2[] = “We can see the string:cheers”;
result = strcmp( string1, string2 );
if( result > 0 )
strcpy( tmp, “大于” );
else if( result < 0 )
strcpy( tmp, “小于” );
else
strcpy( tmp, “等于” );
lr_output_message( “strcmp: String 1 %s string 2”, tmp );
result = stricmp( string1, string2 );
if( result > 0 )
strcpy( tmp, “大于” );
else if( result < 0 )
strcpy( tmp, “小于” );
else
strcpy( tmp, “等于” );
lr_output_message( “stricmp: String 1 %s string 2”, tmp );

运行后在executon log中看到如下语句:

Starting action Action.
Action.c(22): strcmp: String 1 小于 string 2
Action.c(33): stricmp: String 1 等于 string 2

4)strcpy

  char *strcpy ( char *dest, const char *source );
功能:复制一个字符串到另一个字符串中。例子:
复制一个字符串到字符数组中,并打印出来。

脚本如下:
char test[1024];
strcpy(test, “what can we see?”);
lr_output_message(“%s”, test);

运行后在executon log中看到如下语句:

Starting action Action.
Action.c(10): what can we see?

5)Strdup& strlwr

  char *strdup ( const char *string );
功能:复制一个字符串。
char *strlwr ( char *string );
功能:转换成小写字母。例子:
在这个例子中,Vuser的组名被转换为小写字母。但是lr_whoami把组名作为静态buffer返回。这样的buffer不能被操作。如果有操作需要,就复制这个静态buffer。

脚本如下:
int id;
char *groupname_static, *groupname;
lr_whoami(&id, &groupname_static, NULL);
lr_output_message(“groupname=%s”, groupname_static);
groupname = (char *)strdup(groupname_static);
groupname = (char *)strlwr(groupname);
lr_output_message(“lower case groupname=%s”, groupname);
free(groupname);

上述脚本用vugen保存为:CHANGE
在controller中运行(设置为总是发送消息)
运行后在log中看到如下语句:
Starting action Action. [MsgId: MMSG-15919]
Action.c(11): groupname=CHANGE [MsgId: MMSG-17999]
Action.c(16): lower case groupname=change [MsgId: MMSG-17999]

6)Strlen

  size_t strlen ( const char *string );
功能:返回字符串长度(bytes).例子:
这个例子很简单,就是得到一个字符串中的字符的个数。然后打印出来。

脚本如下:
Starting action Action. [MsgId: MMSG-15919]
Action.c(11): groupname=CHANGE [MsgId: MMSG-17999]
Action.c(16): lower case groupname=change [MsgId: MMSG-17999]

运行后在log中看到如下语句:

Action.c(13): The sentence has 18 letters

7)Strncat

  char *strncat ( char *to_string, const char *from_string, size_t n );
功能:把一个字符串连接到另一个字符串后面。例子:
在这里,我随便写了两个字符串,用此函数把他们连接起来,并打印出来。

脚本如下:
char str1[]=”Cheers is “;
char str2[]=”a tester.”;
lr_output_message(“What can we see?”);
lr_output_message(“The str1 is %s.”,str1);
strncat(str1,str2,20);
lr_output_message(“The str1 is %s.”,str1);

运行后在log中看到如下语句:

Action.c(9): What can we see?
Action.c(10): The str1 is Cheers is .
Action.c(13): The str1 is Cheers is a tester..

注:我们可以看到,没有连接前的str1是:Cheers is,连接后的字符串是:Zee is a tester。也可以看看strcat函数。

8)strncmp

  int strncmp ( const char *string1, const char *string2, size_t n );
功能:对比两个字符串的前n位。例子:
对比两个字符串,并把对比结果打印出来。这里我和上面的strcmp一起写。

脚本如下:
char result;
char str1[]=”Cheers is a tester.”;
char str2[]=”Cheers is a tester.”;
char str3[]=”Cheers is a tester?”;
result = strcmp(str1,str2);
if(result > 0)
lr_output_message(“str1 is greater than str2.”);
else if(result < 0)
lr_output_message(“str1 is less than str2.”);
else
lr_output_message(“str1 is equal to str2.”);
result = strncmp( str1, str3 , 30);
if(result > 0)
lr_output_message(“str1 is greater than str3.”);
else if(result < 0)
lr_output_message(“str1 is less than str3.”);
else
lr_output_message(“str1 is equal to str3.”);

运行后在log中看到如下语句:
Starting iteration 1.
Starting action Action.
Action.c(18): str1 is equal to str2.
Action.c(28): str1 is less than str3.