C/C++ Copy file with automatic recursive folder/directory creation

Question

In Win32 API, there is CopyFile that literally copies a file. However, this API doesn\'t create folders. For example, I\'d like to copy C:\\Data\\output.txt to

Answer 1

You can achieve desired result using SHCreateDirectoryEx. Here is an example:

inline void EnsureDirExists(const std::wstring& fullDirPath)
{
    HWND hwnd = NULL;
    const SECURITY_ATTRIBUTES *psa = NULL;
    int retval = SHCreateDirectoryEx(hwnd, fullDirPath.c_str(), psa);
    if (retval == ERROR_SUCCESS || retval == ERROR_FILE_EXISTS || retval == ERROR_ALREADY_EXISTS)
    return; //success

    throw boost::str(boost::wformat(L"Error accessing directory path: %1%; win32 error code: %2%") 
       % fullDirPath
       % boost::lexical_cast(retval));

    //TODO *djg* must do error handling here, this can fail for permissions and that sort of thing
}