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Annotation of q_a/samples/othrproc/readme.txt, revision 1.1

1.1     ! root        1:  Sample: Sharing Named Memory Between Two Processes
        !             2: 
        !             3: Summary:
        !             4: 
        !             5: SHAREMEM and OTHRPROC are two samples which work together to
        !             6: demonstrate sharing named memory between two separate
        !             7: processes.  These samples must be run together.
        !             8: 
        !             9: More Information:
        !            10: 
        !            11: To use: first start an instance of SHAREMEM.  A window will
        !            12: appear, devided into an upper and lower section.  The upper
        !            13: section will have two edit fields: one displaying the mouse
        !            14: pointer's X-coordinates, and the other the pointer's Y
        !            15: coordinates, as the mouse moves in the lower section.
        !            16: 
        !            17: Start an instance of OTHRPROC.  Allow OTHRPROC to keep
        !            18: focus, but move the pointer around over the SHAREMEM'S
        !            19: window.  OTHRPROC has a similar window configuration;
        !            20: however, you will notice that the X and Y coordinates of the
        !            21: mouse as it moves over the SHAREMEM window are the values
        !            22: that appear in the edit fields of OTHRPROC.  To emphasize
        !            23: this, a cross hair will appear in OTHRPROC's lower section;
        !            24: its movements relative to the mouse position in SHAREMEM's
        !            25: window.
        !            26: 
        !            27: What's happening: When SHAREMEM is started, it creates a
        !            28: allocates a piece of named shared memory the size of a DWORD
        !            29: (the size needed to hold the mouse cursor's X and Y
        !            30: coordinates) using CreateFileMapping.  As the mouse pointer
        !            31: is moved across the window, the WM_MOUSEMOVE messages are
        !            32: trapped, and the coordinates are written to the upper edit
        !            33: fields and to the piece of named shared memory.
        !            34: 
        !            35: When OTHRPROC is started, it gets access to the named shared
        !            36: memory by calling OpenFileMapping and MapViewOfFile.
        !            37: OTHRPROC then uses a thread to pool and read the X and Y
        !            38: coordinates written to the shared memory by SHAREMEM.  It
        !            39: captures the coordinates and draws a bit map of a cross hair
        !            40: in the specified location.
        !            41: 
        !            42: 
        !            43: 

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