19.txt

介绍VB里的各种控件的使用方法,窗口控制,图像编程以及OCX等内容,还提供了一个API集供参考.

获取桌面图象 
文章作者： 小屠 

Public Declare Function GetDesktopWindow Lib "user32" () As Long
Public Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function BitBlt Lib "gdi32" _
(ByVal hDestDC As Long, _
ByVal x As Long, _
ByVal y As Long, _
ByVal nWidth As Long, _
ByVal nHeight As Long, _
ByVal hSrcDC As Long, _
ByVal xSrc As Long, _
ByVal ySrc As Long, _
ByVal dwRop As Long) As Long

Private Sub Form_Load()
Dim lDesktop As Long
Dim lDC As Long
Form1.AutoRedraw = True
Form1.ScaleMode = 1
lDesktop = GetDesktopWindow() '取得桌面窗口
lDC = GetDC(lDesktop) '取得桌面窗口的设备场景
BitBlt Me.hDC, 0, 0, Screen.Width, Screen.Height, lDC, 0, 0, vbSrcCopy '将桌面图象绘制到窗体
End Sub