Using Win32 functions in Visual FoxPro Image Gallery
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See also:
  • Scrolling text on the form vertically (a movie cast)
  • Shaking VFP form controls
  • Playing AVI on _screen
  • Displaying animated images
  • Form Magnifier

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    7694 bytes  
    Created: 2002-12-22 13:45:42  
    Modified: 2013-07-09 11:07:23  
    Visits in 7 days: 131  
    Listed functions:
    BitBlt
    CreateCompatibleBitmap
    CreateCompatibleDC
    CreateFont
    CreateSolidBrush
    DeleteDC
    DeleteObject
    FillRect
    GetActiveWindow
    GetDesktopWindow
    GetFocus
    GetTickCount
    GetWindowDC
    ReleaseDC
    SelectObject
    SetBkColor
    SetBkMode
    SetTextColor
    TextOut
    Printer friendly API declarations
    My comment:
    The complete character string is written on invisible canvas, which is a virtual device context.

    At each Timer tick an offset is calculated, and a smaller part of the large image is copied from the invisible canvas to a visible one.

    A visible canvas is the Device Context created either for an instance of a Form or for the _SCREEN object -- the object must have valid HWnd.

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    WPF XAML for the C# sample code:

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