如何从 char[][] 写入文件？
我将数据收集到 char[][] 数组中，然后让用户选择将哪个字符串写入文件。所以我
char arr[3][3]; // assume there are three different two-char long strings in there
FILE* f = fopen("file", "w");
fputs(arr[1], f);
fclose(f);
现在的问题是，我在 fputs() 调用上遇到了段错误，但我不知道为什么。
有什么想法吗？
I am gathering data into a char[][] array, then let a user choose which of those string to write to a file. So I'm doing for example
char arr[3][3]; // assume there are three different two-char long strings in there
FILE* f = fopen("file", "w");
fputs(arr[1], f);
fclose(f);
Now the problem is, I'm getting a segfault on the fputs() call and I dont know why.
Any Ideas?
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确保
fopen返回的文件指针不为NULL；假设 arr 包含有效的以 0 结尾的字符串，这是我能想到的唯一会导致 fputs 呕吐的事情。Make sure the file pointer returned by
fopenisn't NULL; assumingarrcontains valid 0-terminated strings, that's the only other thing I can think of that would causefputsto barf.fputs需要以\0结尾的字符串。确保在您提供的字符串末尾添加0。或者使用fwrite。在
fopen之后检查f != NULLfputsexpects\0-terminated string. Make sure you add0in the end of the string that you supply there. Alternatively usefwrite.check that
f != NULLafterfopenarr 指向什么？我猜问题是由于 arr 未初始化。
What is arr pointing to? I guess the problem is due to arr not being initialized.
arr[1] 指向的 char 数组可能不是以 null 终止的。您应该将
arr声明为char arr[3][4];并用'\0'（空）字符填充最后一列。The char array pointed to by
arr[1]is probably not null-terminated. You should declarearraschar arr[3][4];and fill the last column with'\0'(null) characters.也许您应该检查文件指针返回的值！
May be you should check for the value returned by the file pointer!