Question

我需要起草一个方案,利用档案或单壳(管道处理)的投入。处理这一问题的最有效方式是什么? 我基本上需要按行文读到输入线,但是,投入可能是另一个方案的产出,可能来自壳体或档案。

增编

Answer 1

I can t find the comments link, so post an answer. As Eugen Constantin Dinca said, pipe or redirect just output to the standard input, so what your program need to do is read from standard input.

我不知道,正如你提到的那样,“直线”的含义是什么? 比如,玩弄互动模式? 如果是这样的话,在你发出终点站信号之前,在您的方案中应当有一席之地。

Edit:

int c;
while(-1 != (c = getchar()))
    putchar(c);

Answer 2

https://stackoverflow.com/questions/3793498/echo-all-palindromes-in-c/3794956#3794956。 Echo All Palindromes, in C:

int main(int argc, char* argv[]) {
  int exit_code = NO_MATCH;
  if (argc == 1) // no input file; read stdin
    exit_code = palindromes(stdin);
  else {
    // process each input file
    FILE *fp = NULL;
    int ret = 0;
    int i;
    for (i = 1; i < argc; i++) { 
      if (strcmp(argv[i], "-") == 0)
        ret = palindromes(stdin);
      else if ((fp = fopen(argv[i], "r")) != NULL) {
        ret = palindromes(fp);
        fclose(fp);
      } else {
        fprintf(stderr, "%s: %s: could not open: %s
",
                argv[0], argv[i], strerror(errno));
        exit_code = ERROR;
      }
      if (ret == ERROR) {
        fprintf(stderr, "%s: %s: error: %s
",
                argv[0], argv[i], strerror(errno));
        exit_code = ERROR;
      } else if (ret == MATCH && exit_code != ERROR) 
        // return MATCH if at least one line is a MATCH, propogate error
        exit_code = MATCH;
    }
  }
  return exit_code;
}

为适应C++:接受<代码>std:istream&的书写功能(palindromes;通过std: (关于标准投入或——文档名称)或ifstreams from the

使用<代码>std:getline() with a given std:istream 功能内的物体按行文改为输入线(功能对输入是否来自档案或线)。

Answer 3

我认为,你希望与你一道工作。但是,从我知道的其他方案来看,必须将其产出写给指定管道(如果你能够利用这一方案),你的方案将从指定管道读到。

Hope this helps you.

Answer 4

I might be misinterpreting the question but I think you want your program to be able to be used like this: cat [some_file] | [your_program] or [your program] < [some_file].
If that s the case than you just need to read from the standard input (stdin/cin), the shell will take care of the rest.

如果你想要从中或从档案中读到你的节目,你可以做些什么,即:

cat [OPTION] [FILE]...
...
With no FILE, or when FILE is -, read standard input.

上文所用代码样本见 ts。

友情链接