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TCanvas *dtCanvas = new TCanvas;
dtCanvas->Handle=GetDC(0);

Graphics::TBitmap *bitmap=new Graphics::TBitmap;
bitmap->Width=Width;
bitmap->Height=Height;

int nColors=GetDeviceCaps(Canvas->Handle,SIZEPALETTE);
LOGPALETTE* logPal=(LOGPALETTE*)new Byte[sizeof(LOGPALETTE)+(nColors-1)*sizeof(PALETTEENTRY)];
logPal->palVersion=0x300; logPal->palNumEntries=(Word)nColors;
GetSystemPaletteEntries(Canvas->Handle,0,nColors,logPal->palPalEntry);
bitmap->Palette=CreatePalette(logPal);
delete[] logPal;

TRect src=BoundsRect;
TRect dest=Rect(0,0,Width,Height);
bitmap->Canvas->CopyRect(dest,dtCanvas,src);

bitmap->SaveToFile("Screen.bmp");

delete bitmap;
delete dtCanvas;