如何在c ++中将读取文件的相对地址用于字符串 [英] how to use relative address for read file to string in c++

问题描述

我非常尝试从相对地址使用但我不知道问题在哪里？

看下面的代码

I tried very much for use from relative address but I don't know problem is where?
look below code

string FileName;
cin >> FileName;
ifstream t(FileName);
string str;
t.seekg(0, ios::end);
str.reserve(t.tellg());
t.seekg(0, ios::beg);// message error
str.assign((istreambuf_iterator<char>(t)), istreambuf_iterator<char>());

但我无法读取文件到字符串，我再试一次。

看下面代码

but I can't read file to string and I try again.
look below code

string FileName;
cin >> FileName;
ifstream ifs(FileName);
string str((std::istreambuf_iterator<char>(ifs)), std::istreambuf_iterator<char>());
// str is empty

但绝对地址我没有问题。

以下代码显示绝对地址

but in absolute address I haven't problem.
below code show absolute address

string FileName;
cin >> FileName;
FileName = "C:\\Users\\kaveh\\Documents\\Visual Studio 2013\\Projects\\DCEL\\Debug\\" +FileName;
ifstream t(FileName);
string str;
t.seekg(0, ios::end);
str.reserve(t.tellg());
t.seekg(0, ios::beg);
str.assign((istreambuf_iterator<char>(t)), istreambuf_iterator<char>());

文件和程序在同一个目录中

file and program are in one same directory

推荐答案

我解决了它

I solved it

string FileName;
char buffer[MAX_PATH];
GetModuleFileName(NULL, buffer, MAX_PATH);
string directory = buffer;
unsigned int index;
for (index = directory.length()-1; index > 0; index--)
{
    if (directory[index] == '\\')
    {
    	index++;
    	break;
    }
}
	directory.erase(directory.begin() + index, directory.begin() + directory.length());
cin >> FileName;
FileName = directory + FileName;
ifstream t(FileName);
string str;
t.seekg(0, ios::end);
str.reserve(t.tellg());
t.seekg(0, ios::beg);
str.assign((istreambuf_iterator<char>(t)), istreambuf_iterator<char>());
</char></char>

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