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Sep 7th, 2009

Packing unsigned long into Unicode characters

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Hello!

I'm wondering how to go about packing data from an std::vector<unsigned long> into valid unicode (UTF-8) characters. So far, I've tried writing the unsigned long data directly to a text file, but that usually results in invalid characters.

(I don't actually need to store the data in unsigned long form, I just thought it might make converting the data to unicode characters easier.)

Sorry about not posting any code, but I don't think what I have (above) is worth posting.

Thanks

Last edited by wheel; Sep 7th, 2009 at 5:17 am.

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wheel

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Sep 7th, 2009

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Re: Packing unsigned long into Unicode characters

UNICODE characters is wchar_t, which on MS-Windows is unsigned short and on some other operating systems can be unsigned long. So why not just do something like this?

C++ Syntax (Toggle Plain Text)
size_t i;
wchar_t buf[20];
vector<unsigned long> characters;
for(i = 0; i < characters.size(); i++)
   buf[i] = characters[i];
buf[i] = 0;
size_t i;
wchar_t buf[20];
vector<unsigned long> characters;
for(i = 0; i < characters.size(); i++)
   buf[i] = characters[i];
buf[i] = 0;

Last edited by Ancient Dragon; Sep 7th, 2009 at 9:17 am.

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Sep 7th, 2009

Re: Packing unsigned long into Unicode characters

Thanks for the reply!

I've tried a similar method, and it didn't work (either resulted in errors when opening the file in a unicode text editor, or simply didn't print the characters). Here's my similar code: (with namespace std, of course)

C++ Syntax (Toggle Plain Text)
wofstream outfile("output.txt", ios_base::trunc);
    vector<unsigned long> compressed = compress(inputstr, charmap);
    wchar_t* mychar;
    for(int i = 0; i < compressed.size(); ++i) {
        mychar = reinterpret_cast<wchar_t *>(&compressed[i]);
        outfile<<*mychar;
    }
    outfile<<endl;
    outfile.close();
wofstream outfile("output.txt", ios_base::trunc);
    vector<unsigned long> compressed = compress(inputstr, charmap);
    wchar_t* mychar;
    for(int i = 0; i < compressed.size(); ++i) {
        mychar = reinterpret_cast<wchar_t *>(&compressed[i]);
        outfile<<*mychar;
    }
    outfile<<endl;
    outfile.close();

Because unicode has certain ranges of values that are invalid, I don't think that this method will work in my case.

Last edited by wheel; Sep 7th, 2009 at 3:48 pm.

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