English 中文(简体)
在特定点后从文本文件中删除所有内容
原标题:Deleting everything from a text file after a certain point

这是我在这里的第一个文章。 我正在用 C++ 写入一个程序, 使用文件处理程序, 其中我有一个给定的文本文件, 我希望删除文件中的所有内容, 超过我指针所在的某个点, 之后指示器应该返回到之前的同一个平台 。

如果有人能帮我,我会非常感激的,我很久没有编程了

具体地说,在我的节目中,我有,

.

流式清单;

列表.open (“ 列表. txt ” ) ;

.

清单.seekp(i);

此时此刻,我想删除档案中除字字节之外的所有内容,并确保我所写的更多内容都来自字节。 我该怎么做呢?

谢谢

最佳回答

在文本文件处理过程中,您通常使用两个文件, 从 < 坚固 > 原始 < / 坚固 > 读取, 并写给 < 坚固 > temp < / 坚固 > 。 然后关闭 < 坚固 > temp < / 坚固 >, 取消链接 < 坚固 > 原始 < / 坚固 >, 并重新命名为 < 坚固 > 原始 < / 坚固 > 。 这样做的一个理由是, 如果有崩溃路经过, 您不会失去一切。 第二个原因是, 试图做任何棘手的事情, 在不同的文件系统中使用它时可能不会起作用 。

问题回答

暂无回答




相关问题
Undefined reference

I m getting this linker error. I know a way around it, but it s bugging me because another part of the project s linking fine and it s designed almost identically. First, I have namespace LCD. Then I ...

C++ Equivalent of Tidy

Is there an equivalent to tidy for HTML code for C++? I have searched on the internet, but I find nothing but C++ wrappers for tidy, etc... I think the keyword tidy is what has me hung up. I am ...

Template Classes in C++ ... a required skill set?

I m new to C++ and am wondering how much time I should invest in learning how to implement template classes. Are they widely used in industry, or is this something I should move through quickly?

Print possible strings created from a Number

Given a 10 digit Telephone Number, we have to print all possible strings created from that. The mapping of the numbers is the one as exactly on a phone s keypad. i.e. for 1,0-> No Letter for 2->...

typedef ing STL wstring

Why is it when i do the following i get errors when relating to with wchar_t? namespace Foo { typedef std::wstring String; } Now i declare all my strings as Foo::String through out the program, ...

C# Marshal / Pinvoke CBitmap?

I cannot figure out how to marshal a C++ CBitmap to a C# Bitmap or Image class. My import looks like this: [DllImport(@"test.dll", CharSet = CharSet.Unicode)] public static extern IntPtr ...

Window iconification status via Xlib

Is it possible to check with the means of pure X11/Xlib only whether the given window is iconified/minimized, and, if it is, how?

热门标签