DirectDraw Resolution Problem

I am using directdraw for programming a graphics game, I have 2 characters. I have a problem as when I use resoultionb of 1024 * 768, the game still shows up at 800 * 600, but to make make up for the excess screen there is a white band of flashing screen around the game . So in other words the game screen is reduced and dosent take up the whole screen. Also when I use 800 * 600 resoultion it works fine. 640 * 480 works too but anything greater than 800 *600 dosent work. Anyone know what the problem is?

Maybe if you showed us the relevant code we could offer some advice.

Could just be ur PC, but if you can run windows in 1024*768 there shuldn't be a problem. Have you tried this to check its a valid display mode:

VB Code:

Private DModes As DirectDrawEnumModes
Private rModeCount as Long
Private rModes() as string
 
Dim Temp As DDSURFACEDESC2
    Set DModes = DDraw.GetDisplayModesEnum(DDEDM_DEFAULT, Temp)
    
    rModeCount = DModes.GetCount
    ReDim rModes(1 To rModeCount)
    For i = 1 To rModeCount
        DModes.GetItem i, Temp
        rModes(i) = CStr(Temp.lWidth) & "x" & CStr(Temp.lHeight) & "*" & CStr(Temp.ddpfPixelFormat.lRGBBitCount)
    Next

Hope that will help you.