文件读写文本文件和二进制文件的区别

[jeckma]

int main(int argc, char* argv[])
{
int a =1234;

FILE * file;
file = fopen("test.log","wr");

fwrite(&a,sizeof(char),1,file);
fclose(file);

FILE * file1;
file1 = fopen("test1.log","wrb");

fwrite(&a,sizeof(char),1,file1);
fclose(file1);
return 0;
}

打开生成的文件可以看到没有任何区别。那它们的区别在什么地方呢？

[why25]

一个记事本文件你用两中方法读读看就知道那是有区别地~~

[jeckma]

就是看了没有区别才问啊？

[megaboy]

二进制与文本方式的区别不是这样看的，两者的主要区别，是文本方式允许在输入或输出时，对某些字符进行替换、增加或删除等操作。在windows下，主要的区别就是写入时\n会被替换为\r\n，输出时\r\n又会被重新组合为\n。请看C89/C99关于两种方式的规定：

A text stream is an ordered sequence of characters composed into lines, each line
consisting of zero or more characters plus a terminating new-line character. Whether the last line requires a terminating new-line character is implementation-defined. Characters may have to be added, altered, or deleted on input and output to conform to differing conventions for representing text in the host environment. Thus, there need not be a one to-one correspondence between the characters in a stream and those in the external representation.

A binary stream is an ordered sequence of characters that can transparently record
internal data. Data read in from a binary stream shall compare equal to the data that were earlier written out to that stream, under the same implementation. Such a stream may, however, hav e an implementation-defined number of null characters appended to the end of the stream.

[kikikind]

你在传文件时~~~只能以二进制方式打开exe的文件进行~~~~

[watermelontx]

找一个二进制文件测试一下...

[Tiwen]

ASCII码文件可在屏幕上按字符显示， 例如源程序文件就是ASCII文件，用DOS命令TYPE可显示文件的内容。 由于是按字符显示，因此能读懂文件内容。

　　二进制文件是按二进制的编码方式来存放文件的。 例如， 数5678的存储形式为： 00010110 00101110只占二个字节。二进制文件虽然也可在屏幕上显示， 但其内容无法读懂。C系统在处理这些文件时，并不区分类型，都看成是字符流，按字节进行处理。 输入输出字符流的开始和结束只由程序控制而不受物理符号(如回车符)的控制。 因此也把这种文件称作“流式文件”。

[jeckma]

megaboy(飞天御剑流之杀神一刀斩)的解释真不错，以前一直以为区别在数字上，现在才明白是在特殊字符上。另外你那个C89/C99标准有下载地址吗，很想看看。

[why25]

学习~~~~