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loadrunner常用C函数

?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 @https://www.doczj.com/doc/a26877516.html,

脚本如下:

char test[1024], *a = “@https://www.doczj.com/doc/a26877516.html,”;

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@https://www.doczj.com/doc/a26877516.html,

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 *)strchr(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 );

复制一个字符串。

char *strlwr ( char *string );

转换成小写字母。

例子:
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 );

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 );

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.

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