何将整个画面暗下来，如同关机前一般 - 窗体界面 VB文档技术文档 - 技术文档

Private Declare Function PatBlt Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal dwRop As Long) As Long

Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long

Private Declare Function CreateBitmap Lib "gdi32" (ByVal nWidth As Long, ByVal nHeight As Long, ByVal nPlanes As Long, ByVal nBitCount As Long, lpBits As Any) As Long

Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long

Private Declare Function InvalidateRect Lib "user32" (ByVal hwnd As Long, ByVal lpRect As Long, ByVal bErase As Long) As Long

Private bybits(1 To 16) As Byte

Private hBitmap As Long, hBrush As Long

Private hDesktopWnd As Long

注释：将图变暗，如同待关机一般

Private Sub Command1_Click()

Dim rop As Long, res As Long

Dim hdc5 As Long, width5 As Long, height5 As Long

注释：如果只要让Picture1有效果将底下三行unMark取代 hdc5, width5, height5三个值

注释：hdc5 = Picture1.hdc

注释：width5 = Picture1.ScaleWidth

注释：height5 = Picture1.ScaleHeight

注释：底下三行设定整个萤幕都暗下来

hdc5 = GetDC(0)

width5 = Screen.Width Screen.TwipsPerPixelX

height5 = Screen.Height Screen.TwipsPerPixelY

rop = &HA000C9 注释：与原图做and运算

Call SelectObject(hdc5, hBrush)

res = PatBlt(hdc5, 0, 0, width5, height5, rop)

Call DeleteObject(hBrush)

注释：如果只暗picture1则底下这一行要mark起来

res = ReleaseDC(0, hdc5)

End Sub

注释：回复原本的画面

Private Sub Command2_Click()

Dim aa As Long

注释：如果只暗picture1则底下这一行要unMark起来

注释：Picture1.Refresh

注释：如果只暗picture1则底下这一行要mark起来

aa = InvalidateRect(0, 0, 1)

End Sub

Private Sub Form_Load()

Dim ary

Dim i As Long

ary = Array(&H55, &H0, &HAA, &H0, _

&H55, &H0, &HAA, &H0, _

&H55, &H0, &HAA, &H0)

For i = 1 To 16

bybits(i) = ary(i - 1)

Next i

hBitmap = CreateBitmap(8, 8, 1, 1, bybits(1))

hBrush = CreatePatternBrush(hBitmap)

Picture1.ForeColor = RGB(0, 0, 0)

Picture1.BackColor = RGB(255, 255, 255)

Picture1.ScaleMode = 3

End Sub

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