如何将istream的指针移动n个字符? [英] How to move the pointer of istream by n characters?

问题描述

我想跳过两个istream getline之间的二进制文件中的几个字符.最好的方法是什么?

I would like to skip a few characters in a binary file between two istream getlines. What is the best way to do it?

Shell，我刚刚使用istream :: read读取了一个虚拟变量?

Shell I just read into a dummy variable with istream::read?

或者我使用的壳是n = istream :: tellg和istream :: seekg = n + 1000?

Or shell I use n = istream::tellg and istream::seekg = n + 1000?

推荐答案

您可以使用std::ios::cur position参数相对于当前位置简单地移动流位置:

You can simply move a stream position relative to the current position by using the std::ios::cur position argument:

std::ifstream f("myfile.txt");   // current position 0
f.seekg(200, std::ios::cur);     // relative seek

也可以使用负值.参见例如此处.

Negative values are also permitted. See e.g. here.

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