[英]C programming: write to file without buffer
I am using fputs to write strings to file, but under the debug mode, the content is not written to disk after the statement fputs. 我使用fputs将字符串写入文件,但在调试模式下,语句fputs后内容不会写入磁盘。 I think there is some buffer.
我认为有一些缓冲。 But I would like to debug to check whether the logic is correct by viewing the content directly.
但我想通过直接查看内容来调试以检查逻辑是否正确。 Is there anyway to disable the buffer?
反正有没有禁用缓冲区? Thanks.
谢谢。
You have a couple of alternatives: 你有几个选择:
fflush(f);
to flush the buffer at a certain point. setbuf(f, NULL);
to disable buffering. Where f
is obviously your FILE*
. 其中
f
显然是你的FILE*
。
ie. 即。
#include <stdio.h>
int main(void)
{
char s[100];
FILE *f = fopen("test.txt", "w");
setbuf(f, NULL);
while (fgets(s, 100, stdin))
fputs(s, f);
return 0;
}
OR 要么
#include <stdio.h>
int main(void)
{
char s[100];
FILE *f = fopen("test.txt", "w");
while (fgets(s, 100, stdin)) {
fputs(s, f);
fflush(f);
}
return 0;
}
I don't know if you can't disable the buffer, but you can force it to write in disk using fflush
我不知道你是否无法禁用缓冲区,但你可以强制它使用
fflush
在磁盘中写入
More about it: (C++ reference, but just the same as in C): http://www.cplusplus.com/reference/clibrary/cstdio/fflush/ 更多关于它:( C ++参考,但与C中的相同): http : //www.cplusplus.com/reference/clibrary/cstdio/fflush/
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