我有一个包含以下内容的文本文件：
"abc","def","ghi"
int main()
{
char name[1024] = {0};
FILE *file = fopen("file.txt","r");
while(1)
{
if (fscanf(file," %[\",]s ",name) == EOF)
break;
if (fscanf(file," %[a-zA-Z]s ",name) == EOF)
break;
printf("%s\n",name);
}
return 0;
}
但是,以下失败：
int main()
{
char name[1024] = {0},garbage[5];
FILE *file = fopen("file.txt",]s%[a-zA-Z]s ",garbage,name);
}
return 0;
}
我正在使用MSVC 08.我错过了什么？我正在寻找一个在while循环中使用单个fscanf()的解决方案.
解决方法
有用？？？纯粹运气不好:-)
您的转换规格意味着
" %[\",]s "
^= optionally skip whitespace
^== read a literal 's'
^^^^^^=== read an unlimited string of quotes and commas
^========= optionally skip whitespace
和
" %[a-zA-Z]s "
^= optionally skip whitespace
^== read a literal 's'
^^^^^^^^^=== read an unlimited string of letters
^============ optionally skip whitespace
和
" %[\",]s%[a-zA-Z]s "
^= optionally skip whitespace
^== read a literal 's'
^^^^^^^^^=== read an unlimited string of letters
^============ read a literal 's'
^^^^^^============= read an unlimited string of quotes and commas
^=================== optionally skip whitespace
我想你想要的
" %4[\",]%1023[a-zA-Z] "
^= optionally skip whitespace
^^^^^^^^^^^^^== read a string of at most 1023 letters
^^^^^^^=============== read a string of at most 4 quotes and commas
^====================== optionally skip whitespace
除此之外,scanf返回错误的成功转换次数或EOF.当您应该与1(或2或其他)进行比较时,您将结果值与EOF进行比较：与您期望的转化次数进行比较.
if (scanf() == 3) /* expected 3 conversions */
{ /* ok */ }
else { /* oops,something went wrong */ }
