我在窗体上放了一个影像控件(可以接入由显微镜传入电脑的图像,并且影像是移动的),
然后在影像控件上画了一个固定的十字线,由十字线的交点来读取影像上这一点的颜色值.
现在可以读取影像移动的距离(就像摄像头中显示物体移动一样),但是却无法读取这个
点的颜色值,请大侠指点一下,如需这个控件请留下email.
谢谢!
然后在影像控件上画了一个固定的十字线,由十字线的交点来读取影像上这一点的颜色值.
现在可以读取影像移动的距离(就像摄像头中显示物体移动一样),但是却无法读取这个
点的颜色值,请大侠指点一下,如需这个控件请留下email.
谢谢!
的返回值即为所求如果没有提供这个属性:
GetPixel 影像控件所在容器.hdc,指定点的横坐标,指定点的横坐标
的返回值即为所求
lblData的控件数组
picture控件
功能:取得鼠标经过点的颜色值
你可以改造以下,在form的MouseMove事件中判断
Option ExplicitPrivate Type POINTAPI
x As Long
y As Long
End Type
Private 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 Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
Private Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPrivate Sub Timer1_Timer()
Static lX As Long, lY As Long
On Local Error Resume Next
Dim P As POINTAPI, h As Long, hD As Long, r As Long
GetCursorPos P
If P.x = lX And P.y = lY Then Exit Sub
lX = P.x: lY = P.y
lblData(0).Caption = lX & "," & lY
h = WindowFromPoint(lX, lY)
lblData(1).Caption = h
hD = GetDC(h)
lblData(2).Caption = hD
ScreenToClient h, P
lblData(3).Caption = P.x & "," & P.y
r = GetPixel(hD, P.x, P.y)
If r = -1 Then
BitBlt Picture1.hdc, 0, 0, 1, 1, hD, P.x, P.y, vbSrcCopy
r = Picture1.Point(0, 0)
Else
Picture1.PSet (0, 0), r
End If
lblData(4).Caption = Hex$(r)
Picture1.BackColor = r
End Sub
GetPixel【操作系统】
Win9X:Yes
WinNT:Yes【声明】
GetPixel Lib "gdi32" Alias "GetPixel" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long【说明】 在指定的设备场景中取得一个像素的RGB值 【返回值】 Long,指定点的RGB颜色。如指定的点位于设备场景的剪切区之外,则返回CLR_INVALID 【其它】 用GetDeviceCaps判断设备是否支持本函数【参数表】
hdc ------------ Long,一个设备场景的句柄 x,y ------------ Long,逻辑坐标中要检查的点