设置屏幕分辨率和颜色
procedure SetRes(XRes, YRes: DWord);
var
lpDevMode : TDeviceMode;
begin
EnumDisplaySettings(nil, 0, lpDevMode);
lpDevMode.dmFields:=DM_PELSWIDTH or DM_PELSHEIGHT;
lpDevMode.dmPelsWidth:=XRes;
lpDevMode.dmPelsHeight:=YRes;
ChangeDisplaySettings(lpDevMode, 0);
end;
******************
设置屏幕颜色深度
procedure Toggle;
var
i : LongInt;
b : LongInt;
DevM : TDEVMODE;
h: HDC;
w: HWND;
IsToggled: Boolean;
PreviousBitsPerPixel: Integer;
begin
IsToggled := not IsToggled;
w:=GetDesktopWindow;
h:=GetDC(w);
try
if IsToggled then
begin {change to 8 bit}
PreviousBitsPerPixel := GetDeviceCaps(h, BITSPIXEL);
i := -1;
Repeat
Inc(i);
Until EnumDisplaySettings(pchar(0), i, DevM) = False;
DevM.dmFields := DM_BITSPERPEL;
DevM.dmBitsPerPel := 8;
b := ChangeDisplaySettings(DevM, 0);
if ((GetDeviceCaps(h, RASTERCAPS) and RC_PALETTE) = 0) or
(b <> DISP_CHANGE_SUCCESSFUL) then
begin
showmessage('can''t use palettes');
IsToggled := False;
end
end else {Change mform to palette values and perform desired 8 bit display}
else begin {change back value}
i := -1;
Repeat
Inc(i);
Until EnumDisplaySettings(pchar(0), i, DevM) = False;
DevM.dmFields := DM_BITSPERPEL;
DevM.dmBitsPerPel := PreviousBitsPerPixel;
b := ChangeDisplaySettings(DevM, 0);
if b <> DISP_CHANGE_SUCCESSFUL then showmessage( 'Error restoring origional display');
end;
finally
ReleaseDC(w,h);
end;
end;
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