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Код


...
string folderout{get; set;}
string folderin{get; set; }
...
//функция для подсчета файлов

extern static void MaxValue(string outl,ref long maxbar);
            [DllImport("Exploer_03(dll).dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
            extern static void MaxValueWchar(string outl,ref int maxbar);

            void UpdateProgressMax()
            {
                int barr = bar.Maximum;
                MaxValueWchar(folderout, ref barr);
                bar.Invoke(new MethodInvoker(delegate { bar.Maximum = barr; }));
            }

//функция для копирования папки

[DllImport("Exploer_03(dll).dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
            extern static void copyd(string outl, string inl, ref int lg);
void copyfromdll()
            {
                int lg = 0;
                bar.Invoke(new MethodInvoker(delegate { bar.Value = lg; }));
                copyd(folderout, folderin, ref lg);
                MessageBox.Show("End");
            }

//создание потоков для копирования

public void runcopy(string outl, string inl)
            {
                folderout = outl + "\\";
                folderin = inl + "\\";
                Thread thr = new Thread(UpdateProgressMax);
                thr.IsBackground = true;
                thr.Start();
                bar.Invalidate();
                Thread thr1 = new Thread(copyfromdll);
                thr1.Start();
            }

Код


extern "C" _declspec(dllexport) void CopyFolder( CString sours,  CString dest, long * num)
{
    HANDLE result;
    WIN32_FIND_DATA data;
    if (sours[sours.GetLength() - 1] != L'\\')
        sours += L'\\';
    if (dest[dest.GetLength() - 1] != L'\\')
        dest += L'\\';
    result = FindFirstFileEx(sours + L"*.*",FindExInfoBasic, &data,FindExSearchNameMatch,NULL,0);
    do 
    {
        if (result == INVALID_HANDLE_VALUE)
            break;
        if (data.cFileName[0] == L'.')
            continue;
        if ( (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
        {
            HANDLE handle;
            handle = FindFirstFileW(dest + data.cFileName, new WIN32_FIND_DATA() );
            if (handle == INVALID_HANDLE_VALUE)
                CreateDirectory(dest + data.cFileName,NULL);
            CopyFolder(sours + data.cFileName, dest + data.cFileName, num);
        }
        else
        {
            HANDLE handle;
            WIN32_FIND_DATA date;
            handle = FindFirstFileW(dest + data.cFileName, &date);
            if (handle == INVALID_HANDLE_VALUE)
                CopyFileW(sours + data.cFileName,dest + data.cFileName,false);
            else
                if (date.ftLastWriteTime.dwHighDateTime > 
                    data.ftLastWriteTime.dwHighDateTime)
                    CopyFileW(sours + data.cFileName,dest + data.cFileName,true);
            wchar_t *ti = data.cFileName;
            (*num)++;
        }
    } while (FindNextFileW(result,&data) != 0);
    FindClose(result);
}

extern "C" _declspec(dllexport) void MaxValue(CString Path, long *maximum)
{
    if (Path[Path.GetLength()] != L'\\')
        Path += L'\\';
    HANDLE handle;
    WIN32_FIND_DATA data;
    handle = FindFirstFile(Path + L"*.*",&data);
    do 
    {
        if (handle == INVALID_HANDLE_VALUE)
            break;
        if (data.cFileName[0] == L'.')
            continue;
        if ( (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
        {
            MaxValue(Path + data.cFileName, maximum);
        }
        else
            (*maximum)++;
    } while (FindNextFile(handle,&data) != 0);
}

extern "C" _declspec(dllexport) void MaxValueWchar(wchar_t * path, long * lg)
{
    CString Path = path;
    MaxValue(Path, lg);
}

extern "C" _declspec(dllexport) void copyd(const wchar_t *str1,const wchar_t *str2, long * num)
{
    CString st1 = str1;
    CString st2 = str2;
    CopyFolder(st1,st2, num);
}