[Solved] How to create new folders directories from C++?



  • Hey!

    I need to create new folders from C++.
    I have tried this:

    @
    void masterResource::makeDirectories(QString folder)
    {
    QStringList fields = folder.split("///");
    folder = fields.at(1).trimmed();

    CreateDirectory("folder+"/Work", NULL);
    CreateDirectory(folder+"/InTouch", NULL);
    

    }
    @

    But then I get these errors:

    error: cannot convert 'const char*' to 'LPCWSTR {aka const wchar_t*}' for argument '1' to 'WINBOOL CreateDirectoryW(LPCWSTR, LPSECURITY_ATTRIBUTES)'

    and

    error: cannot convert 'const QString' to 'LPCWSTR {aka const wchar_t*}' for argument '1' to 'WINBOOL CreateDirectoryW(LPCWSTR, LPSECURITY_ATTRIBUTES)'



  • Never mind, got it to work. The function was

    @CreateDirectoryA("folder+"/Work", NULL);@

    instead of

    @CreateDirectory("folder+"/Work", NULL);@

    Notice the 'A'.



  • Another option is to use QDir
    @
    void masterResource::makeDirectories(QString folder)
    {
    QStringList fields = folder.split("///");
    folder = fields.at(1).trimmed();

    QDir currentDir;
    
    currentDir.mkpath(folder + "/Work");
    currentDir.mkpath(folder + "/InTouch");
    

    }
    @


  • Moderators

    All in all you should do what andreyc says and use portable Qt APIs, but if you won't then:

    Don't use A methods of winAPI. They are obsolete ANSI variant and don't handle national characters. You should use the W variants or the "no letter" macros (which get expanded to W variants when UNICODE is defined, which is the default these days). You need to provide a wide string for these, eg.
    @
    QString path = ...
    CreateDirectory(path.toStdWString().c_str());
    @
    If you use wide character string literals prepend them with letter L, eg. L"some string". That's how you define a wchar_t string literal in c++;

    Btw. your "folder" variable is a QString and the winAPI function takes a wchar_t pointer (LPCWSTR expands to that) so I don't see how your solution could work.


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