利用vb语言编写获取屏幕指指定坐标的颜色,要求在文本框中输入坐标,则能够显示出当前坐标点的颜色值
时间: 2024-02-27 15:53:21 浏览: 26
以下是利用 VB 语言编写获取屏幕指定坐标颜色的代码:
```
Private Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Private Sub Command1_Click()
Dim x As Long
Dim y As Long
Dim hdc As Long
Dim color As Long
x = Val(Text1.Text)
y = Val(Text2.Text)
hdc = GetDC(0)
color = GetPixel(hdc, x, y)
ReleaseDC 0, hdc
Text3.Text = "0x" & Hex(color)
End Sub
```
其中,`GetPixel` 函数可以获取指定坐标点的颜色值,`GetDC` 函数可以获取屏幕的设备上下文句柄,`ReleaseDC` 函数可以释放设备上下文句柄。
在窗体中添加 3 个文本框和 1 个按钮,分别为 `Text1`、`Text2`、`Text3` 和 `Command1`,然后将上述代码复制到 `Command1_Click` 事件中。
当用户在 `Text1` 和 `Text2` 中输入坐标后,点击 `Command1` 按钮,就可以获取指定坐标点的颜色值,并显示在 `Text3` 中。