实现效果;

API FindWindow函数 //可用来返回任务栏所在窗口Shell_TrayWnd的句柄
IpClassName :要返回的窗口的类名称字符串指针
IpWindowName:要返回的窗口的名称
GetWindowRect函数 //获取任何一个窗口的矩阵范围的函数
hwnd:目标窗口的句柄
IpRect:存储窗口区域的Rectangle结构变量
[DllImport("user32.dll")]
public static extern int FindWindow(string IpClassName,string IpWindowName);
[DllImport("user32.dll")]
public static extern int GetWindowRect(int hwnd,ref Rectangle IpRect);
Rectangle rect;
private void button1_Click(object sender, EventArgs e)
{
if ((GetWindowRect(FindWindow("Shell_TrayWnd", null), ref rect)) == 0)
return;
else
{
textBox1.Text = Convert.ToString(rect.Left);
textBox2.Text = Convert.ToString(rect.Top);
textBox3.Text = Convert.ToString(rect.Right);
textBox4.Text = Convert.ToString(rect.Bottom);
}
}