strlen:获取字符串的长度
  char str[20]="容我想想";
  int len;
  len = strlen(str);
  lr_output_message("str的长度=%d",len);
  Action.c(9): str的长度=8
  strupr:将小写字母转化为大写字母
  char str[20] ="Welcome to the HP LoadRunner Online Function Reference";
  char *str1 = NULL;
  str1 = (char *)strupr(str);
  lr_output_message("str的内容转化为大写为%s",str1);
  strlwr:将小写字母转化为大写字母
  char str[20] ="RONGWOXIANGXIANG";
  char *str1 = NULL;
  lr_output_message("str的内容转化为小写为%s",strlwr(str));
  strrchr:在字符串中查找指定字符后一次出现
  char *str="Welcome to the HP LoadRunner Online Function Reference";
  char *str1;
  str1 = (char *)strrchr(str,'c');
  lr_output_message("c 后一次出现时在%s",str1);
  strchr:在字符串中查找字符第一次出现
  char *str="Welcome to the HP LoadRunner Online Function Reference";
  char *str1;
  str1 = (char *)strchr(str,'c');
  lr_output_message("c第一次出现是在%s",str1);
  strncpy:拷贝指定长度的字符串
  char str[100]="容我想想老师之性能测试系列培训课程";
  char str1[100];
  strncpy(str1,str,8);
  lr_output_message("str的值为%s",str1);
  strcpy:拷贝字符串
  char str[100]="容我想想老师之性能测试系列培训课程";
  char str1[100];
  strcpy(str1,str);
  lr_output_message("str的值为%s",str1);
  strnicmp:不区分大小写比较指定长度的字符串
  char str[100] ="Welcome to the HP LoadRunner Online Function Reference";
  char str1[100]="WELCOME TO THE HP LOADRUNNER ONLINE FUNCTION REFERENCE";
  int num;
  num = strnicmp(str,str1,10);
  if(num == 0)
  lr_output_message("str == str1");
  else if(num > 0)
  lr_output_message("str > str1");
  else if(num < 0)
  lr_output_message("str <  str1");
  stricmp:不区分大小写比较字符串
  char str[100] ="Welcome to the HP LoadRunner Online Function Reference";
  char str1[100]="WELCOME TO THE HP LOADRUNNER ONLINE FUNCTION REFERENCE";
  int num;
  num = stricmp(str,str1);
  if(num == 0)
  lr_output_message("str == str1");
  else if(num > 0)
  lr_output_message("str > str1");
  else if(num < 0)
  lr_output_message("str <  str1");
  strncmp:比较指定长度字符串
  char str[100] = "Welcome to the HP LoadRunner Online Function Reference";
  char str1[100]= "Welcome TO THE HP LOADRUNNER ONLINE FUNCTION REFERENCE";
  int num;
  num = strncmp(str,str1,8);
  if(num == 0)
  lr_output_message("str == str1");
  else if(num > 0)
  lr_output_message("str > str1");
  else if(num < 0)
  lr_output_message("str < str1");
  strncmp:字符串比较
  char str[100] = "Welcome to the HP LoadRunner Online Function Reference";
  char str1[100]= "Welcome TO THE HP LOADRUNNER ONLINE FUNCTION REFERENCE";
  int num;
  num = strcmp(str,str1);
  if(num == 0)
  lr_output_message("str == str1");
  else if(num > 0)
  lr_output_message("str > str1");
  else if(num < 0)
  lr_output_message("str < str1");
  strcat:拼接字符串
  char str[100]="容我想想";
  char str1[100]="老师之性能测试系列培训课程";
  char *str2;
  str2 = (char *)strcat(str,str1);
  lr_output_message("str1的值为%s",str2);