输入文本并保存到文件

以下函数创建一个新的文本文件并允许用户输入要保存到文件中的文本。我遇到麻烦的主要问题是 1）允许单词之间有空格 2）按 Enter 保存文本，而不是转到新行。

void new_file(void) 
{
    char c[10000];              
    char file[10000];
    int words;
    printf("Enter the name of the file\n");
   scanf("%123s",file);
    strcat(file,".txt"); 
    FILE * pf; 
   pf = fopen(file, "w" );

   if (!pf)
   fprintf( stderr, "I couldn't open the file.\n" );

   else
   {
        printf("Enter text to be saved\n");
        scanf("%s", c);     
        fprintf(pf, "%s", c); 
    }

    fclose(pf);  // close file  
    printf("\n\nReturning to main menu...\n\n"); 
}

Use fgets() http://man7.org/linux/man-pages/man3/gets.3.html代替scanf()获取用户输入的文本。

为此，请替换此行

scanf("%s", c); 

使用以下代码：

if (NULL != fgets(c, sizeof(c), stdin))
{
  fprintf(pf, "%s", c);
}
else
{
  if (0 != ferror(stdin))
  {
    fprintf(stderr, "An error occured while reading from stdin\n");
  }
  else
  {
    fprintf(stderr, "EOF was reached while trying to read from stdin\n");
  }
}

为了允许用户读取多行内容，请在上面的代码周围放置一个循环。为此，您需要定义一个条件来告诉程序停止循环：

The following example stops reading in lines when entering a single dot "." and pressing return:

do
{
  if (NULL != fgets(c, sizeof(c), stdin))
  {
    if (0 == strcmp(c, ".\n")) /* Might be necessary to use ".\r\n" if on windows. */
    {
      break;
    }

    fprintf(pf, "%s", c);
  }
  else
  {
    if (0 != ferror(stdin))
    {
      fprintf(stderr, "An error occured while reading from stdin\n");
    }
    else
    {
      fprintf(stderr, "EOF was reached while trying to read from stdin\n");
    }

    break;
  }
} while (1);