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IDirectDrawSurface::Blt function return DDERR_SURFCAELOST

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When I run the code DEMO7_8 from the book tricks of the windows game programming gurus , the Blt function reurns DDERR_SURFACELOST , what is wrong with it? thank you for your reply!

The following is the main part of the code:

int Game_Main(void *parms = NULL, int num_parms = 0)
// this is the main loop of the game, do all your processing
// here

DDBLTFX ddbltfx; // the blitter fx structure
static int feeling_counter = 0; // tracks how we feel :)
static int happy = 1; // let's start off being happy

// make sure this isn't executed again
if (window_closed)

// for now test if user is hitting ESC and send WM_CLOSE
window_closed = 1;
} // end if

// use the blitter to erase the back buffer
// first initialize the DDBLTFX structure

// now set the color word info to the color we desire
ddbltfx.dwFillColor = 0;

// make the blitter call

// lock the back buffer surface

if ((lpddsback->Blt(NULL, // pointer to dest RECT, NULL for whole thing
NULL, // pointer to source surface
NULL, // pointer to source RECT
// do a color fill and wait if you have to
&ddbltfx))) // pointer to DDBLTFX holding info
return 0;

// initialize ddsd

if (FAILED(lpddsback->Lock(NULL,&ddsd,
MessageBox(NULL,"Lock Error!", "", NULL);

// increment how we feel
if (++feeling_counter > 200)
feeling_counter = 0;
happy = -happy;
} // end if

// draw all the happy faces
for (int face=0; face < 100; face++)
// are we happy or sad?
if (happy==1) // we are happy :)
(UCHAR *)ddsd.lpSurface,
else // we must be sad :(
(UCHAR *)ddsd.lpSurface,

} // end face

// move all happy faces
for (int face=0; face < 100; face++)
// move

// check for off screen, if so wrap
if (happy_faces[face].x > SCREEN_WIDTH)
happy_faces[face].x = -8;
if (happy_faces[face].x < -8)
happy_faces[face].x = SCREEN_WIDTH;

if (happy_faces[face].y > SCREEN_HEIGHT)
happy_faces[face].y = -8;
if (happy_faces[face].y < -8)
happy_faces[face].y = SCREEN_HEIGHT;

} // end face

// unlock surface
if (FAILED(lpddsback->Unlock(NULL)))

// flip the pages
while (FAILED(lpddsprimary->Flip(NULL, DDFLIP_WAIT)));

// wait a sec

// return success or failure or your own return code here

} // end Game_Main.

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