ifstream 中的getline的问题

[clayXmore]

#include <iostream>
#include <fstream>
using namespace std;

int main() 
{
	const char *InFile="D:\\InData.txt";

	ifstream in(InFile,ifstream::in);
	if(!in)
	{
		cerr<<"Open file "<<InFile<<" failed!"<<endl;
		system("pause");
		return -1;
	}

	const int m=11;
	char line[m];

	while(!in.eof())
	{
		//in.clear();
		in.getline(line,m);
		cout<<line<<endl;
	}
	
	in.close();
	system("pause");
	return 0;
}

程序加上in.clear()是对的，但是不加好像程序陷入死循环，而且没有任何的输出，能不能给讲讲这是为什么？
InData.txt的数据是djhgaksdhgkhsfljkglasjdklfjalksdjflsadlkgjlasjdlg;asdsdgalskdfgla

[evencoming]

看源码吧
或者msdn?
If the function extracts no elements or _Count - 1 elements, it calls setstate(failbit). In any case, it returns *this.

[clayXmore]

读的字符的个数小于文件的字符数

[clayXmore]

求高人解答

[evencoming]

[Quote=引用 2 楼 的回复:]
读的字符的个数小于文件的字符数
[/Quote]
[code=C/C++]
basic_istream<Elem, Tr>& getline(
char_type *_Str,
streamsize _Count
);
basic_istream<Elem, Tr>& getline(
char_type *_Str,
streamsize _Count,
char_type _Delim
);

The first of these unformatted input functions returns getline(_Str, _Count, widen('\n')).

The second function extracts up to _Count - 1 elements and stores them in the array beginning at _Str. It always stores the string termination character after any extracted elements it stores. In order of testing, extraction stops:

At end of file.

After the function extracts an element that compares equal to _Delim, in which case the element is neither put back nor appended to the controlled sequence.

After the function extracts _Count - 1 elements.

If the function extracts no elements or _Count - 1 elements, it calls setstate(failbit). In any case, it returns *this.

_Count
The number of characters to read from strbuf.

_Delim
The character that should terminate the read if it is encountered before _Count.

_Str
A string in which to write.

[/CODE]

再仔细看看. 在你上面的代码中,_Count的值是11.那么仔细看下面这句:
If the function extracts no elements or _Count - 1 elements, it calls setstate(failbit)

[sjyzhxw]

坐等高手回答