/// <summary>
/// 获取窗口的客户区相对于窗口左上角的矩形.(特别注意:如果有非客户区起点一般不为0,0 如果没有非客户区该值同ClientRectangle相等).该函数非常特别尽量不要调用,在非客户区操作时可能使用到,其余问题请咨询编写人员. by Tim 2013.11.23
/// </summary>
/// <param name="hWnd">指定窗口句柄</param>
/// <returns>客户区相对于窗口坐标系的坐标和大小</returns>
public static NativeMethods.RECT GetClientRect(IntPtr hWnd)
{
NativeMethods.RECT wndRect = new NativeMethods.RECT(); //窗口相对于屏幕的坐标和大小
NativeMethods.RECT clientRect = new NativeMethods.RECT(); //以0,0开始的客户区坐标和大小
UnsafeNativeMethods.GetWindowRect(hWnd, ref wndRect); //窗口
UnsafeNativeMethods.GetClientRect(hWnd, ref clientRect); //客户区
UnsafeNativeMethods.MapWindowPoints(hWnd, NativeMethods.HWND_DESKTOP, ref clientRect, 2); //客户区映射到屏幕
//偏移
clientRect.left -= wndRect.left;
clientRect.top -= wndRect.top;
clientRect.right -= wndRect.left;
clientRect.bottom -= wndRect.top;
//返回
return(clientRect);
}
/// <summary>
/// 获取表示控件的工作区的矩形。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <returns>一个 System.Drawing.Rectangle，它表示控件的工作区。</returns>
public static Rectangle GetClientRectangle(IntPtr hWnd)
{
NativeMethods.RECT lpRect = new NativeMethods.RECT();
UnsafeNativeMethods.GetClientRect(hWnd, ref lpRect);
return(lpRect.ToRectangle());
}
/// <summary>
/// 获取控件的工作区的高度和宽度。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <returns>一个 System.Drawing.Size，表示控件的工作区的维数。</returns>
public static Size GetClientSize(IntPtr hWnd)
{
NativeMethods.RECT lpRect = new NativeMethods.RECT();
UnsafeNativeMethods.GetClientRect(hWnd, ref lpRect);
return(lpRect.Size);
}
