scroll bar and text displaying

[DeCoDeR]

hi,
i try to display the content of a text file in my application ( mo mfc, just win32 apis)
first i read all the contents of a file to a char array.
when it is time to display it, i failed.
i can display only the contents that fits the window.
can anyone show me an example how to handle WM_PAINT message and display the rest ?
i do the scroll messages by looking at examples like below :
---------
case WM_SIZE:
cxClient = LOWORD(wParam);
cyClient = HIWORD(wParam);
//vertical
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_PAGE|SIF_RANGE;
si.nPage = cyClient / icyChar;
si.nMin = 0;
si.nMax = ilen-1;
SetScrollInfo(hwnd,SB_VERT,&si,TRUE);
//next is horizantal
si.nPage = cxClient / icxChar;
si.nMin =0;
si.nMax = 50 * icxChar;
SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);
return 0;

case WM_VSCROLL:
//get old vpos
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd,SB_VERT,&si);
ivPos = si.nPos ;

switch(LOWORD(wParam))
{
case SB_TOP :
si.nPos = si.nMin ;
break;
case SB_BOTTOM:
si.nPos = si.nMax ;
break;
case SB_LINEUP:
si.nPos --;
break;
case SB_LINEDOWN:
si.nPos ++;
break;
case SB_PAGEDOWN:
si.nPos += si.nPage ;
break;
case SB_PAGEUP:
si.nPos -= si.nPage ;
break;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos ;
break;
default:
break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd,SB_VERT,&si,TRUE);
GetScrollInfo(hwnd,SB_VERT,&si);

if(si.nPos != ivPos)
{
ScrollWindow(hwnd,0,(ivPos-si.nPos )*icyChar,NULL,NULL);
UpdateWindow(hwnd);
}

return 0;

case WM_HSCROLL:
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd,SB_HORZ,&si);
ihPos = si.nPos ;

switch(LOWORD(wParam))
{
case SB_LINELEFT:
si.nPos --;
break;
case SB_LINERIGHT:
si.nPos ++;
break;
case SB_PAGELEFT:
si.nPos -= si.nPage ;
break;
case SB_PAGERIGHT:
si.nPos += si.nPage;
break;
case SB_THUMBPOSITION:
si.nPos = si.nTrackPos ;
break;
default:
break;
}
SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);
GetScrollInfo(hwnd,SB_HORZ,&si);

if(si.nPos != ihPos)
{
ScrollWindow(hwnd,(ihPos-si.nPos)*icxChar,0,NULL,NULL);
UpdateWindow(hwnd);
}
return 0;

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