实现关机时的效果的一段代码

　　unsigned char bybits[16]={0x55,0x0,0xaa,0x0,0x55,0x0,0xaa,0x0,

0x55,0x0,0xaa,0x0,0x55,0x0,0xaa,0x0};

HANDLE hBitmap,hBrush;

//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)

{

/使屏幕暗下来

HANDLE hdc5;

hBitmap=CreateBitmap(8,8,1,1,&bybits[0]);

hBrush=CreatePatternBrush(hBitmap);

hdc5=GetDC(0);

SelectObject(hdc5,hBrush);

PatBlt(hdc5,0,0,Screen->Width,Screen->Height,0xa000c9);

DeleteObject(hBrush);

DeleteObject(hBitmap);

ReleaseDC(0,hdc5);

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)

{

//复原屏幕

InvalidateRect(0,0,1);

}

//---------------------------------------------------------------------------