读取文件的全部内容到c的char *，包括新线 [英] Read the entire contents of a file to c char *, including new lines

问题描述

我在找一个跨平台（Windows + Linux）的解决方案，以读取整个文件的内容到的char * 。

I'm looking for a cross platform (Windows + Linux) solution to reading the contents of an entire file into a char *.

这是我现在得到：

FILE *stream;
char *contents;
fileSize = 0;

//Open the stream
stream = fopen(argv[1], "r");

//Steak to the end of the file to determine the file size
fseek(stream, 0L, SEEK_END);
fileSize = ftell(stream);
fseek(stream, 0L, SEEK_SET);

//Allocate enough memory (should I add 1 for the \0?)
contents = (char *)malloc(fileSize);

//Read the file 
fscanf(stream, "%s", contents);     

//Print it again for debugging
printf("Read %s\n", contents);

不幸的是这将只打印文件中的第一行，所以我假设的fscanf停在第一个换行符。不过，我想读取整个文件包括，和preserving，新行字符。我想preFER不使用whil​​e循环和realloc手动构建整个字符串，我的意思是，必须有一个简单的方法？

Unfortunately this will only print the first line in the file so I assume that fscanf stops at the first newline character. However I would like to read the entire file including, and preserving, the new line characters. I'd prefer not to use a while loop and realloc to manually construct the entire string, I mean there has to be a simpler way?

推荐答案

这样的事情，可能是？

FILE *stream;
char *contents;
fileSize = 0;

//Open the stream. Note "b" to avoid DOS/UNIX new line conversion.
stream = fopen(argv[1], "rb");

//Seek to the end of the file to determine the file size
fseek(stream, 0L, SEEK_END);
fileSize = ftell(stream);
fseek(stream, 0L, SEEK_SET);

//Allocate enough memory (add 1 for the \0, since fread won't add it)
contents = malloc(fileSize+1);

//Read the file 
size_t size=fread(contents,1,fileSize,stream);
contents[size]=0; // Add terminating zero.

//Print it again for debugging
printf("Read %s\n", contents);

//Close the file
fclose(stream);
free(contents);

这篇关于读取文件的全部内容到c的char *，包括新线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！