VS 2017 文件基本操作函数

Code

#include <iostream>
#include <cstdlib>
#include <process.h>

FILE *stream, *stream1, *stream2;
#pragma warning(disable:4996)

int main()
{
	int numclosed;
	char list[30];  // 存放从文件中读取的数据
	int i, numread, numwritten;

	// 打开文件 data 进行度，文件不存在则失败
	if (!(stream1 = fopen("data", "r")))
		printf("Data Failed !\n");
	else
		printf("Data Successful !\n");

	// 打开文件2进行写操作
	if (!(stream2 = fopen("data2", "w+")))
		printf("Data2 Write Failed !\n");
	else
		printf("Data2 Write Successful !\n");

	// 使用文本模式打开文件，对文件进行写操作
	if ((stream = fopen("fread.out", "w+t")))
	{
		// 向文件流中写入25个字符
		for (i = 0; i < 25; i++)
		{
			list[i] = char('z' - i);
		}
		numwritten = fwrite(list, sizeof(char), 25, stream);
		printf("Written Successful: %d\n", numwritten);
		fclose(stream);
	}
	else
	{
		printf("fread.out Write Failed !\n");
	}

	if ((stream = fopen("fread.out", "r")))
	{
		numread = fread(list, sizeof(char), 25, stream);
		printf("读取的数据个数 = %d\n", numread);
		printf("读取的内容为：%.25s\n", list);
		fclose(stream);
	}
	else
	{
		printf("fread.out Read Failed !\n");
	}
	numclosed = _fcloseall();
	printf("Closed File Number is: %d\n", numclosed);

	system("pause");
	return 0;
}

Output