我们读取这样的一个文件：

普通的读取操作代码：

#include "stdio.h"
#include "windows.h"
#include "process.h"

FILE *stream, *stream1;

int main(void)
{
	errno_t err;
	char ch;
	// Open for read (will fail if file "in1.txt" does not exist)
	if ((err = fopen_s(&stream, "in.txt", "r")) != 0)
	{
		printf("The file 'in.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'in.txt' was opened\n");
		//Sleep(3000);
	}
	// Open for write 
	if ((err = fopen_s(&stream1, "temp.txt", "w")) != 0)
	{
		printf("The file 'temp.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'temp.txt' was opened\n");
		//Sleep(3000);
	}
	while ((ch = getc(stream)) != EOF)
	{
		//putchar(ch);
		fputc(ch, stream1);
	}
	fclose(stream);
	fclose(stream1);
	system("pause");
	return 0;
}

原来的969k只读出来了107k，反正没有读完！下面我们试试二进制读取：

#include "stdio.h"
#include "windows.h"
#include "process.h"

FILE *stream, *stream1;

int main(void)
{
	errno_t err;
	char ch;
	// Open for read (will fail if file "in1.txt" does not exist)
	if ((err = fopen_s(&stream, "in.txt", "rb")) != 0)///b代表以二进制流读取文件
	{
		printf("The file 'in.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'in.txt' was opened\n");
		//Sleep(3000);
	}
	// Open for write 
	if ((err = fopen_s(&stream1, "tempB.txt", "wb")) != 0)///b代表以二进制流写入文件
	{
		printf("The file 'tempB.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'tempB.txt' was opened\n");
		//Sleep(3000);
	}
	while ((ch = getc(stream)) != EOF)
	{
		//putchar(ch);
		fputc(ch, stream1);
	}
	fclose(stream);
	fclose(stream1);
	system("pause");
	return 0;
}

装逼成功！不过为了安全起见，我还是建议你利用宽字符集来读取！因为语言的多样性！

看代码：

#include "stdio.h"
#include "windows.h"
#include "process.h"

FILE *stream, *stream1;

int main(void)
{
	errno_t err;
	char ch;
	// Open for read (will fail if file "in1.txt" does not exist)
	if ((err = _wfopen_s(&stream, L"in.txt", L"rb")) != 0)///_wopen_s代表以二进制流宽字符形式读取文件
	{
		printf("The file 'in.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'in.txt' was opened\n");
		//Sleep(3000);
	}
	// Open for write 
	if ((err = _wfopen_s(&stream1, L"WtempB.txt",L"wb")) != 0)///_wopen_s代表以二进制流宽字符形式写入文件
	{
		printf("The file 'WtempB.txt' was not opened\n");
		//Sleep(3000);
	}
	else
	{
		printf("The file 'WtempB.txt' was opened\n");
		//Sleep(3000);
	}
	while ((ch = getc(stream)) != EOF)
	{
		//putchar(ch);
		fputc(ch, stream1);
	}
	fclose(stream);
	fclose(stream1);
	system("pause");
	return 0;
}

你或许注意到了，这个文件的大小远比969k大，这是用宽字符读取的正常结果，因为一个宽字符是两个字节！当我们不知道文件里面有什么时，为了安全起见，还是用宽字符读取好！就因为语言文字的多样性。谁知道一个文件里面有没有阿拉伯语，德文，法文....