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CreateRegionFromFile

, 10 Dec 2001
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Very primitive function that creates region from *.bmp files.

Introduction

This very simple function creates a region from a bitmap (.bmp) file. 8, 16, 24 and 32 bit color modes are supported.

The function takes two parameters:

  • hBmp - a handle to the bitmap image.
  • color - transparent color.
HRGN CreateRgnFromFile( HBITMAP hBmp, COLORREF color );

Using the function is very simple. For example, if you wish to set the window shape of your dialog, then in your OnInitDialog handler, do this:

BOOL CFileRgnDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // load image
    HBITMAP hBmp = (HBITMAP)LoadImage( AfxGetInstanceHandle(), 
                     "Rgn.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE );
    // if fail - nothing to do
    if ( hBmp == NULL ) return TRUE;
    // create region, let the RED color be transparent

    HRGN hRgn = CreateRgnFromFile( hBmp, RGB(255,0,0) );

    // build memory dc for background
    CDC* dc = GetDC();
    m_dcBkGrnd = CreateCompatibleDC( dc->m_hDC );
    ReleaseDC( dc );
    // select background image
    SelectObject( m_dcBkGrnd, hBmp );
    // set window size the same as image size
    SetWindowPos( NULL, 0, 0, m_dwWidth, m_dwHeight, 
                           SWP_NOZORDER | SWP_NOMOVE );
    // assign region to window
    SetWindowRgn( hRgn, FALSE );

    return TRUE;
}

History

  • December 08 2001

    * cut & paste bug for 16-bit mode (white color as transparent did not work).

    * pixels in a last column has not been used.

    + Now you can use non-aligned (by width) images.

  • June 11 2001

    * ExtCreateRegion NT-problem (personal thanks to Martin for reporting about it).

License

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Comments and Discussions

 
GeneralNot working on Windows Seven PinmemberDom306-May-11 21:19 
GeneralRe: Not working on Windows Seven PinmemberMember 112345026-May-11 10:01 
GeneralMy vote of 5 Pinmemberryan20fun9-Feb-11 20:15 
GeneralRotated Edit Box PinsussZAKIR2-Sep-04 3:57 
GeneralCreateRgnFromFile question Pinsussrioan31-Jul-04 10:23 
GeneralRe: CreateRgnFromFile question PinmemberYuriy_Zaporozhets5-Oct-04 13:59 
GeneralCustom controls ... PinmemberAdrian Datcu10-Jun-04 0:58 
GeneralFantastic !!! PinsussHarleyDude28-Apr-04 16:37 
GeneralGreat example PinmemberUbersnack10-Jun-03 0:42 
GeneralAdapting this PinmemberJudd11-Dec-02 3:27 
Generalfinally found it PinmemberKevin Smith1-Nov-02 9:10 
this is excellent, I've looked at about 4 or 5 classes that do just this, and yours works the best by far...
 
other classes would load slowly, or require dll's, this is very smooth and nice
GeneralLarge Fonts PinmemberMatt Philmon5-Feb-02 11:11 
GeneralRegionToBitmap class... Pinmembersaturn5-Feb-02 1:53 
GeneralArticle screwed up... no links PinmemberMatt Philmon11-Dec-01 4:44 
GeneralRe: Article screwed up... no links PinmemberChris Maunder11-Dec-01 10:44 
Generaldoesn't work in 16bits, look at this valid code ... PinmemberF.Julien20-Sep-01 0:28 
Generaldoesn't work when you want white as transparent color Pinmemberbene29-Aug-01 3:47 
GeneralI found here how to load HBITMAP from file... PinmemberPavel Kurochkin26-Aug-01 12:42 
Questionit's not working .... why? Pinmemberscwpark30-Jul-01 20:15 
QuestionWhat it taje to get ::ExtCreateRegion work in NT PinsussAndy9-Oct-00 17:01 
AnswerRe: What it taje to get ::ExtCreateRegion work in NT PinmemberAnonymous1-Mar-01 23:04 
GeneralRe: What it taje to get ::ExtCreateRegion work in NT PinmemberAnonymous2-Apr-01 18:46 
Generalbuggy, slow code PinsussFeng Yuan www,fengyuan.com8-Sep-00 19:37 
GeneralRe: buggy, slow code PinsussLance Gordon29-Sep-00 4:04 
GeneralI need some help here... (rookie!) PinsussMatuX19-Jul-00 17:27 

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