fscanf_s

codePorter-faceCV 2019-07-17 04:14:36

fscanf_s如何读取两个字符，我这样写运行出错?

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轻箬笠 2019-07-19

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深入理解C++11:C++11新特性解析与应用

codePorter-faceCV 2019-07-19

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引用 4 楼轻箬笠的回复:

#include <stdio.h>
#include <string.h>
int main()
{
	FILE *file = NULL;
	char a[10];
	char b[10];
	fopen_s(&file, "11.txt", "w+");
	fprintf_s(file, "%s %s", "aaaaa", "bbb");
	fseek(file, 0, SEEK_SET);
	fscanf(file, "%s %s", a, b);
	fclose(file);
	return 0;
}
fscanf从一个流中执行格式化输入，fscanf遇到空格和换行时结束，注意空格时也结束。用fscanf也可以实现楼主的类似要求。只是逗号需要变成空格

谢了，还有一个问题，请问有没有学c++11语法的书，好多这样的语法我都找不到

轻箬笠 2019-07-18

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#include <stdio.h>
#include <string.h>
int main()
{
	FILE *file = NULL;
	char a[10];
	char b[10];
	fopen_s(&file, "11.txt", "w+");
	fprintf_s(file, "%s %s", "aaaaa", "bbb");
	fseek(file, 0, SEEK_SET);
	fscanf(file, "%s %s", a, b);
	fclose(file);
	return 0;
}

fscanf从一个流中执行格式化输入，fscanf遇到空格和换行时结束，注意空格时也结束。用fscanf也可以实现楼主的类似要求。只是逗号需要变成空格

轻箬笠 2019-07-18

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// crt_fscanf_s.c
// This program writes formatted
// data to a file. It then uses fscanf to
// read the various data back from the file.

#include <stdio.h>
#include <stdlib.h>

FILE *stream;

int main( void )
{
   long l;
   float fp;
   char s[81];
   char c;

   errno_t err = fopen_s( &stream, "fscanf.out", "w+" );
   if( err )
      printf_s( "The file fscanf.out was not opened\n" );
   else
   {
      fprintf_s( stream, "%s %ld %f%c", "a-string",
               65000, 3.14159, 'x' );
      // Set pointer to beginning of file:
      fseek( stream, 0L, SEEK_SET );

      // Read data back from file:
      fscanf_s( stream, "%s", s, _countof(s) );
      fscanf_s( stream, "%ld", &l );

      fscanf_s( stream, "%f", &fp );
      fscanf_s( stream, "%c", &c, 1 );

      // Output data read:
      printf( "%s\n", s );
      printf( "%ld\n", l );
      printf( "%f\n", fp );
      printf( "%c\n", c );

      fclose( stream );
   }
}

受教育了，把fscanf和fscanf_s混为一谈了。上面是fscanf_s的各种用法，读取字符串时，需要指定长度。

codePorter-faceCV 2019-07-18