Anyone know C++ DirectX by any chance?

[gman]

I'm having a bit of a problem blitting a plain box in 256 color mode to the backbuffer.
Here is my code:

DDBLTFX ddbltfx; // this contains the DDBLTFX structure
RECT fill_area;  // this contains the destination rectangle
UCHAR col = 50;


// clear out the structure and set the size field 
memset(&ddbltfx,0,sizeof(DDBLTFX));
ddbltfx.dwSize = sizeof(DDBLTFX);

// set the dwfillcolor field to the desired color
ddbltfx.dwFillColor = col; 

// fill in the destination rectangle data (your data)
fill_area.top    = rand()%SCREEN_HEIGHT;
fill_area.left   = rand()%SCREEN_WIDTH;
fill_area.bottom = rand()%SCREEN_HEIGHT;
fill_area.right  = rand()%SCREEN_WIDTH;

// ready to blt to surface, in this case blt to backbuffer
lpddsback->Blt(&fill_area, // ptr to dest rectangle
                  NULL,       // ptr to source surface, NA            
                  NULL,       // ptr to source rectangle, NA
                  DDBLT_COLORFILL | DDBLT_WAIT,   // fill and wait                   
                  &ddbltfx);  // ptr to DDBLTFX structure

Its supposed to display a random sized box, delete it, then draw it again.
Repeat that until it quits.

For some reason I draw to the backbuffer and then do a page flip yet nothing shows up.
I don't want to have to use images though. Such a waste of space to make a box when I can just use the blitter.

[Nocando]

Hey look, that code looks like a bunch of random numbers and letters to me, wow ;D

-Asitro-

[gman]

Ah whatever...

I was going to make the classic pong. But I'll use graphics instead.

I think I found out how to fix the code too. I probably just had to add a pointer to the back buffer in the Blt command.
Like this:

lpddsback->Blt(&fill_area, // ptr to dest rectangle
&Back_Buffer,       // ptr to source surface,NA
NULL,       // ptr to source rectangle, NA
DDBLT_COLORFILL | DDBLT_WAIT,   // fill and wait 
&ddbltfx);  // ptr to DDBLTFX structure

I'm not even going to bother trying.
I just made a new animation engine and need to test it