how to convert vector<unsigned char*> to std:string ?
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Thread: how to convert vector<unsigned char*> to std:string ?

  1. #1
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    how to convert vector<unsigned char*> to std:string ?

    Hello I have a vector<unsigned char*> and I want to convert it to a std::string. How can I do that?

  2. #2
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    VictorN is offline Super Moderator Power Poster
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    Re: how to convert vector<unsigned char*> to std:string ?

    vector<unsigned char*> or vector<unsigned char>?
    Victor Nijegorodov

  3. #3
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    Re: how to convert vector<unsigned char*> to std:string ?

    unsigned char*.

    Right now I think I figured out a way, but it might not be optimal:

    Code:
    string temp;
    for(vector<unsigned char*>::iterator it = vec.begin(); it != vec.end(); it++) 
         temp.append(*it);

  4. #4
    VictorN's Avatar
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    Re: how to convert vector<unsigned char*> to std:string ?

    Would you like to concatenate all the char* (char arrays) being in the vector?
    Victor Nijegorodov

  5. #5
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    Re: how to convert vector<unsigned char*> to std:string ?

    Yes. Is the way I posted above the best way?

  6. #6
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    Re: how to convert vector<unsigned char*> to std:string ?

    It almost works yeah. There are 2 issues: append accepts a "const char*", but you are giving it an "unsigned char*", so you will have to cast that. Furthermore, the fact that you have an "unsigned char*" to begin with (and not a "char*"), seems to imply you are operating on bytes and not strings? Does your unsigned char* actually point to a null terminated array?

    I don't know if it's the "best" way, but it should work yeah. If you are using C++11, you can use the simpler range-based for loop:
    Code:
    string temp;
    for (auto p : vec) 
         temp.append(static_cast<char*>(p));
    Is your question related to IO?
    Read this C++ FAQ LITE article at parashift by Marshall Cline. In particular points 1-6.
    It will explain how to correctly deal with IO, how to validate input, and why you shouldn't count on "while(!in.eof())". And it always makes for excellent reading.

  7. #7
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    Re: how to convert vector<unsigned char*> to std:string ?

    it an "unsigned char*", so you will have to cast that. Furthermore, the fact that you have an "unsigned char*" to begin with (and not a "char*"),

  8. #8
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    Re: how to convert vector<unsigned char*> to std:string ?

    it an "unsigned char*", so you will have to cast that. Furthermore, the fact that you have an "unsigned char*" to begin with (and not a "char*"),





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    Last edited by boby147; September 19th, 2014 at 12:34 AM.

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