GetPixel Problem

This is a discussion on GetPixel Problem within the Windows Programming forums, part of the Platform Specific Boards category; PHP Code: HDC bitmapDC ; HBITMAP bitmapHandle ; COLORREF bmpSample ;      bitmapHandle =( HBITMAP ) LoadImage ( 0 , "e:\mytestsample.bmp" , IMAGE_BITMAP ...

  1. #1
    Registered User
    Join Date
    Apr 2007
    Posts
    10

    GetPixel Problem

    PHP Code:
    HDC bitmapDC;
    HBITMAP bitmapHandle;
    COLORREF bmpSample;
        
    bitmapHandle=(HBITMAP)LoadImage(0,"e:\\mytestsample.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
        
    bitmapDC GetDC((HWND)bitmapHandle);
        
    bmpSample GetPixel(bitmapDC2331);
        
    cout << "aaa " << bmpSample << '\n'
    I get a 9 digit value for bmpSample lol.

  2. #2
    Guest Sebastiani's Avatar
    Join Date
    Aug 2001
    Location
    Waterloo, Texas
    Posts
    5,708
    this question belongs on the windows board...

    // bitmapDC = GetDC((HWND)bitmapHandle);

    first of all, why are you casting an HBITMAP to HWND? their completely incompatible types. you need to create a compatible device context with the one you'll be drawing to (in this case, the screen), then select the bitmap into it.

    Code:
    HDC sdc = GetDC(NULL); // ie: the screen
    HDC cdc = CreateCompatibleDC(sdc);
    SelectObject(cdc, bmp);
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

  3. #3
    Super Moderator VirtualAce's Avatar
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    Aug 2001
    Posts
    9,598
    Moved to the Windows board.

  4. #4
    Registered User Joelito's Avatar
    Join Date
    Mar 2005
    Location
    Tijuana, BC, México
    Posts
    308
    Maybe if you can put bitmapHandle in a static control..you can use correctly GetPixel
    * PC: Intel Core 2 DUO E6550 @ 2.33 GHz with 2 GB RAM: Archlinux-i686 with xfce4.
    * Laptop: Intel Core 2 DUO T6600 @ 2.20 GHz with 4 GB RAM: Archlinux-x86-64 with xfce4.

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