GetCaretPos VB声明
Declare Function GetCaretPos Lib "user32" Alias "GetCaretPos" (lpPoint As POINTAPI) As Long
说明
判断插入符的当前位置
返回值
Long,非零表示成功,零表示失败。会设置GetLastError
参数表
参数 类型及说明
lpPoint POINTAPI,这个结构会随同插入符在窗口客户坐标系统中的位置载入;那个窗口是插入符的父窗口
Declare Function GetCaretPos Lib "user32" Alias "GetCaretPos" (lpPoint As POINTAPI) As Long
说明
判断插入符的当前位置
返回值
Long,非零表示成功,零表示失败。会设置GetLastError
参数表
参数 类型及说明
lpPoint POINTAPI,这个结构会随同插入符在窗口客户坐标系统中的位置载入;那个窗口是插入符的父窗口
是:
GetCursorPos VB声明
Declare Function GetCursorPos Lib "user32" Alias "GetCursorPos" (lpPoint As POINTAPI) As Long
说明
获取鼠标指针的当前位置
返回值
Long,非零表示成功,零表示失败。会设置GetLastError
参数表
参数 类型及说明
lpPoint POINTAPI,随同指针在屏幕像素坐标中的位置载入的一个结构
x As Long
y As Long
End TypePublic Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As LongPublic Declare Function GetDC Lib "user32" (h As Long) As LongPublic Declare Function GetPixel Lib "gdi32" (h As Long, x As Long, y As Long) As Long Dim hTempDC As Long
Dim TempP As POINTAPI
Dim TempC As Long
hTempDC = GetDC(0)
Call GetCursorPos(TempP)
TempC = GetPixel(hTempDC, TempP.x, TempP.y)
Call ReleaseDC(0, hTempDC)
lpPoint POINTAPI,随同指针在屏幕像素坐标中的位置载入的一个结构
是什么意思?能详细说说吗
本示例使用 Point 方法来确定一个窗体上的一个指定点的颜色。要检验此示例,可将本例代码粘贴到一个窗体的声明部分,然后按 F5 键并单击该窗体。Private Sub Form_Click ()
Dim LeftColor, MidColor, Msg, RightColor ' 声明变量。
AutoRedraw = -1 ' 打开AutoRedraw。
Height = 3 * 1440 ' 将高度设置为 3 英寸。
Width = 5 * 1440 ' 将宽度设置为 5 英寸。
BackColor = QBColor(1) ' 将背景设置为蓝色。
ForeColor = QBColor(4) ' 将前景设置为红色。
Line (0, 0)-(Width / 3, Height), , BF ' 红框。
ForeColor = QBColor(15) ' 将前景设置为白色。
Line (Width / 3, 0)-((Width / 3) * 2, Height), , BF
LeftColor = Point(0, 0) ' 查找左框颜色,,
MidColor = Point(Width / 2, Height / 2) ' 中框, 和
RightColor = Point(Width, Height) ' 右框。
Msg = "The color number for the red box on the left side of "
Msg = Msg & "the form is " & LeftColor & ". The "
Msg = Msg & "color of the white box in the center is "
Msg = Msg & MidColor & ". The color of the blue "
Msg = Msg & "box on the right is " & RightColor & "."
MsgBox Msg ' 显示信息。
End Sub
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
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 CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, lpInitData As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Private Declare Function GetPixel Lib "gdi32" Alias "GetPixel" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
SourceDC = CreateDC("DISPLAY", 0, 0, 0)
DestDC = CreateCompatibleDC(SourceDC)
BHandle = CreateCompatibleBitmap(SourceDC, rWidth, rHeight)
SelectObject DestDC, BHandle
BitBlt DestDC, 0, 0, rWidth, rHeight, SourceDC, Lt, Top, &HCC0020
lRGB=GetPixel (SourceDC ,0,0)