writting std::vector<sf::String> to .txt file and load from it.

[wmbuRn]

So i have variable

std::vector<sf::String> variableName;  // dont mind the name
 

And i want to write its contents to a file. here is function:

void writte2file(std::vector<sf::String> Text) // problem is here
{
ofstream saveIt;
saveIt.open ("Data.txt", ios::app);
saveIt << Text;   // and problem here, will post it after code
saveIt << "\n";
saveIt.close();
}
 

Here is how i called function from for loop:

for (unsigned int i = 0; i < 30; ++i)
{
writte2file(variableName);
}
 

Error:  no match for ‘operator<<’ in ‘saveIt << Text’ .

 I think thats becouse standard c++ doesnt know of sf::String. Any idea how to solve this? And sfml addon for file system or anything?

Thank you in Advance
wmbuRn


 

[Atani]

Error:  no match for ‘operator<<’ in ‘saveIt << Text’ .

 I think thats becouse standard c++ doesnt know of sf::String. Any idea how to solve this? And sfml addon for file system or anything?

Looks more like a misuse of std::vector.  This is a collection type and you would likely need to iterate it to get the sf::String objects and write those individually instead of trying to write the collection object.

something like this maybe (not exactly right, not in front of an IDE currently):

for(std::iterator *iter = Text.start(); iter != Text.end(); iter++) {
  saveIt << *iter;
}
 

[Nexus]

"Text " should rather be called "texts" or "strings", since there are multiple. Iteration then looks as follows:

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)

C++11:

for (auto itr = strings.begin(); itr != strings.end(); ++itr)

for (sf::String& s : strings)

[FRex]

If you want to just use normal ascii then use .toAnsiString(); and save that and load it as std::string.

If you want real unicode support you can use this code to save and load them as UTF-8, it's most painless, locales might mess with it thought so don't use them.
What I (and many others) do and recommend doing to cut all the crap with locales, codepages and UTF other than UTF-8 is treat text as binary, use \n line endings and encode it in UTF-8 without BOM. This is arguably the best way.

sf::String sf32FromStd8(const std::string& str)
        {
                sf::String ret;
                sf::Uint32 c;
                auto it=str.begin();
                while(it!=str.end())
                {
                        it=sf::Utf8::decode(it,str.end(),c,0u);
                        if(c!=0u) ret+=c;
                }
                return ret;
        }
         std::string std8FromSf32(const sf::String& str)
        {
                std::string ret;
                char buf[5];

                for(auto it=str.begin();it!=str.end();++it)
                {
                        auto end=sf::Utf32::encode(*it,buf);
                        *end='\0';
                        ret+=buf;
                }
                return ret;
        }

[wmbuRn]

Code that you posted is not working it didnt helped me. Anyway i never learned iterators, so i will have to learn it. Thank you for your answers guys.

[FRex]

It does work for me, what is the problem?
You know you have to include:
#include <SFML/System/String.hpp>
#include <SFML/System/Utf.hpp>
#include <string>
before it, because it uses these classes, right?

[wmbuRn]

for(std::iterator *iter = Text.start(); iter != Text.end(); iter++) {
  saveIt << *iter;
}
 

I get error: missing template arguments before ‘*’ token.
error no2. iter was not declared in this scope.
error no3. about Text.start() it should be Text.begin()
Never learned iterator so i have no idea what i am doing

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)
 

Is working, but as i can see it does not save any value to .txt

this i add:

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)
{
saveIt << *itr // or saIt << &itr or saveIt << itr i get error
}
 

error: no match for ‘operator<<’ in ‘saveIt << itr.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator* [with _Iterator = sf::String*, _Container = std::vector<sf::String>, __gnu_cxx::__normal_iterator<_Iterator, _Container>::reference = sf::String&]()’|

for c++11

Code: [Select]

for (auto itr = strings.begin(); itr != strings.end(); ++itr)
for (sf::String& s : strings)
I dont have c++11, since i have gcc 4.6.3. Gcc site stated that c++11 is partialy included in gcc4.7, and fully in 4.8.1.

FRex i havent tested your code, [yet] becouse i have no idea where to put it. Never did transfer from utf8 to anscii ... And i just looking how to write vector to .txt file noobish style

[Atani]

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)
{
saveIt << *itr // or saIt << &itr or saveIt << itr i get error
}
 

error: no match for ‘operator<<’ in ‘saveIt << itr.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator* [with _Iterator = sf::String*, _Container = std::vector<sf::String>, __gnu_cxx::__normal_iterator<_Iterator, _Container>::reference = sf::String&]()’|

Change this to:

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)
{
saveIt << itr.toAnsiString();
}
 

Or, pass "itr" to the functions that FRex put up.

[wmbuRn]

for (std::vector<sf::String>::iterator itr = strings.begin(); itr != strings.end(); ++itr)
{
saveIt << itr.toAnsiString();
}
 

error: ‘std::vector<sf::String>::iterator’ has no member named ‘toAnsiString’|

[FRex]

use -> not . on iterator types

[wmbuRn]

use -> not . on iterator types

It compiles, but after clicking on button to save data program crashes with:
Segmentation fault (core dumped)

[FRex]

That's a complicated issue, you should debug your code, you might be deleting something twice, or accessing something that is already deleted or uninitialized.

[FRex]

Yes but you have to find out in some way(debugging with gdb, valgrind, putting printfs in code etc.) which line exactly crashes and why.

[wmbuRn]

Yup. GDB told me where the bug is. I solved it but make new one. It does save now, it just saves same data about 300 times lol will fix it. Function to load data from txt into vector will be pain.   Thank you for your help guys


Edit: Saving works as it should. Thank you guys