/// <summary>
/// 创建层窗体
/// </summary>
/// <param name="bmp">窗体图像</param>
/// <param name="keepBmp">是否保留图像，为false会销毁图像</param>
public LayeredWindow(Bitmap bmp, bool keepBmp = false)
{
try
{
RegisterWindowClass();
//初始化绘制相关
_dcMemory = CreateCompatibleDC(IntPtr.Zero);
_hBmp = bmp.GetHbitmap(Color.Empty);
_oldObj = SelectObject(_dcMemory, _hBmp);
Width = bmp.Width;
Height = bmp.Height;
_size = new PointOrSize(Width, Height);
}
finally
{
if (!keepBmp)
{
bmp.Dispose();
}
}
}
private static extern bool UpdateLayeredWindow(IntPtr hWnd, IntPtr hdcDst, PointOrSize pptDst, PointOrSize pSizeDst, IntPtr hdcSrc, PointOrSize pptSrc, int crKey, ref BLENDFUNCTION pBlend, int dwFlags);