WinApi - znak końca lini

#include <windows.h>
#include <string>

void InitWindow( int width, int height, std::string name );
LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam );
LRESULT CALLBACK NewWndProc( HWND hwnd, UINT mesg, WPARAM wParam, LPARAM lParam );

void Copy();
void LoadFile();
void Chat();
void Load();
void SaveFile();


HWND hWnd;
HWND hMessageBox;
HWND hChatBox;
WNDPROC g_OldWndProc;

using namespace std;

string text;
string pathOfFile;
string nick;
string message;
string textAktual;
int proces = 0;

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
    InitWindow( 400, 500, "Chat" );
    MSG message;
    while( GetMessage( & message, NULL, 0, 0 ) )
    {
        TranslateMessage( & message );
        DispatchMessage( & message );
    }
    return message.wParam;
}

void InitWindow( int width, int height, std::string name )
{
    HINSTANCE hProg = GetModuleHandle( 0 );
    WNDCLASSEX wc;
    wc.cbSize = sizeof( WNDCLASSEX );
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hProg;
    wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    wc.hCursor = LoadCursor( NULL, IDC_ARROW );
    wc.hbrBackground =( HBRUSH )( COLOR_WINDOW + 1 );
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "WndClass";
    wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION );
    RegisterClassEx( & wc );
    hWnd = CreateWindowEx( 0, "WndClass", name.c_str(), WS_OVERLAPPEDWINDOW,
    0, 0, width, height, 0, 0, hProg, 0 );
    ShowWindow( hWnd, 5 );
    UpdateWindow( hWnd );
    hMessageBox = CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | WS_VSCROLL | ES_MULTILINE | ES_AUTOVSCROLL, 5, height - 120, width - 20, 80, hWnd, NULL, hProg, NULL );
    hChatBox = CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | WS_VSCROLL | ES_MULTILINE | ES_AUTOVSCROLL, 5, 5, width - 20, height - 140, hWnd, NULL, hProg, NULL );
    g_OldWndProc =( WNDPROC ) SetWindowLong( hMessageBox, GWL_WNDPROC,( LONG ) NewWndProc );
    SetWindowText( hMessageBox, "twoj nick" );
    textAktual = "";
}

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    Load();
    switch( msg )
    {
    case WM_CLOSE:
        DestroyWindow( hwnd );
        break;
    case WM_DESTROY:
        PostQuitMessage( 0 );
        break;
    case WM_KEYDOWN:
        switch(( int ) wParam )
        {
        case VK_RETURN:
            Copy();
            Chat();
            break;
        case VK_ESCAPE:
            DestroyWindow( hwnd );
            break;
        }
        break;
        default:
        return DefWindowProc( hwnd, msg, wParam, lParam );
    }
    return 0;
}

void Copy() {
    DWORD dlugosc = GetWindowTextLength( hMessageBox );
    LPSTR Bufor =( LPSTR ) GlobalAlloc( GPTR, dlugosc + 1 );
    GetWindowText( hMessageBox, Bufor, dlugosc + 1 );
    message = Bufor;
    GlobalFree( Bufor );
}

LRESULT CALLBACK NewWndProc( HWND hwnd, UINT mesg, WPARAM wParam, LPARAM lParam )
{
    switch( mesg )
    {
    case WM_KEYDOWN:
        {
            CallWindowProc( WndProc, hwnd, mesg, wParam, lParam );
        }
        break;
    }
    return CallWindowProc( g_OldWndProc, hwnd, mesg, wParam, lParam );
}

void LoadFile() {
    LPSTR Bufor;
    DWORD dwRozmiar, dwPrzeczyt;
    HANDLE hPlik;
    hPlik = CreateFile( pathOfFile.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, 0, NULL );
    dwRozmiar = GetFileSize( hPlik, NULL );
    Bufor =( LPSTR ) GlobalAlloc( GPTR, dwRozmiar + 1 );
    ReadFile( hPlik, Bufor, dwRozmiar, & dwPrzeczyt, NULL );
    Bufor[ dwRozmiar ] = 0;
    text = Bufor;
    GlobalFree( Bufor );
    CloseHandle( hPlik );
}
void Chat() {
    switch( proces ) {
    case 0:
        nick = message;
        SetWindowText( hMessageBox, "" );
        SetWindowText( hMessageBox, "temat" );
        proces++;
        break;
    case 1:
        pathOfFile = message;
        SetWindowText( hMessageBox, "" );
        proces++;
        break;
        default:
        SaveFile();
        SetWindowText( hMessageBox, "" );
        break;
    }
}

void Load() {
    LoadFile();
    if( textAktual != text ) {
        SetWindowText( hChatBox, text.c_str() );
        textAktual = text;
    }
}

void SaveFile() {
    string txt = textAktual + char( '\n' );
    txt += "[" + nick + "]" + message;
    LPSTR Bufor;
    DWORD dwRozmiar = txt.length();
    Bufor =( LPSTR ) GlobalAlloc( GPTR, dwRozmiar + 1 );
    Bufor =( LPSTR ) txt.c_str();
    DWORD dwZapisane;
    HANDLE hPlik;
    hPlik = CreateFile( pathOfFile.c_str(), GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, 0, NULL );
    WriteFile( hPlik, Bufor, dwRozmiar, & dwZapisane, NULL );
    CloseHandle( hPlik );
}