c# 获取当前活动窗口句柄,获取窗口大小及位置

需调用API函数
需在开头引入命名空间
using System.Runtime.InteropServices;
获取当前窗口句柄:GetForegroundWindow()
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GetForegroundWindow();
返回值类型是IntPtr,即为当前获得焦点窗口的句柄
使用方法 : IntPtr myPtr=GetForegroundWindow();
获取到该窗口句柄后,可以对该窗口进行操作.比如,关闭该窗口或在该窗口隐藏后,使其显示
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
其中ShowWindow(IntPtr hwnd, int nCmdShow);
nCmdShow的含义
0 关闭窗口
1 正常大小显示窗口
2 最小化窗口
3 最大化窗口
使用实例: ShowWindow(myPtr, 0);
获取窗口大小及位置:需要调用方法GetWindowRect(IntPtr hWnd, ref RECT lpRect)
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left; //最左坐标
public int Top; //最上坐标
public int Right; //最右坐标
public int Bottom; //最下坐标
}
示例:
InPtr awin = GetForegroundWindow(); //获取当前窗口句柄
RECT rect = new RECT();
GetWindowRect(awin, ref rect);
int width = rc.Right - rc.Left; //窗口的宽度
int height = rc.Bottom - rc.Top; //窗口的高度
int x = rc.Left;
int y = rc.Top;