StringStream到Character的转换. [英] StringStream to Character conversion.

问题描述

我有一个文件abc.txt，需要逐行读取并从中提取令牌.

I have a file abc.txt which i need to read line by line and extract tokens from it.

while( getline( x, s1 ) )
{
string s2=s1.str()
strtok( s2, seps );					
}

在上面的代码中，我从用户提交的文件x中获取输入字符串流，并在s1中使用它.此后，我多次使用循环来读取一行.现在我需要在strtok函数的参数中使用等于第一行字符串的s1的值. strtok不接受.我将s1字符串流转换为s2字符串.即使这样，strtok也不会接受s2.

错误是；

In the code above i am taking an input stringstream from the file x submitted by the user and using it in s1. thereafter i am using a loop as many times i get to read a line. now i need to use the value of s1 which equals string of first line, in the strtok function''s parameter. strtok does not accepts this. i converted s1 stringstream to s2 string. even then strtok is not accepting s2.

The error is ;

hw2.cpp:57: error: request for member 'str' in 'st', which is of non-class type 'char [1]'
hw2.cpp:66: error: cannot convert 'std::string' to 'char*' for argument '1' to 'char* strtok(char*, const char*)'
hw2.cpp:59: warning: unused variable 'cstr1'

推荐答案

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You are flooding the forum with questions which you could easily answer yourself with a bit of basic research and some hard study. Get hold of a decent C++ book and study the language so you have at least a reasonable understanding of simple things like reading files, handling strings, etc.

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