vs2012用wpf制作透明窗口中报错的解决方案

在开发wpf项目时，需要调用外部com组件，同时需要制作透明窗口，于是问题出现了，当我们在设置 AllowsTransparency="True"后，com组件显示不出来了，只有透明属性为false才能正常显示，此时找到了http://blog.csdn.net/detecyang/article/details/7946237这篇博客，他提供了很好的解决方案，当我使用后问题出现了，他提供的类在vs2008的.net3.5环境运行一切正常，但放到vs2012我的开发环境中，运行就会报错，提示“原托管的 PInvoke 签名与非托管的目标签名不匹配。请检查 PInvoke 签名的调用约定和参数与非托管的目标签名是否匹配。”

为了解决这个问题查阅了msdn，找到setwindowlong(intptr,int32,intptr)方法，问题的关键就出在这里，后有修改了类代码，完美运行，不再报错，代码如下：

  class NativeMethods
    {
        /// <summary>   

        /// 带有外边框和标题的windows的样式   

        /// </summary>   

        public const long WS_CAPTION = 0x00C00000L;

        public const long WS_CAPTION_2 = 0X00C0000L;

        // public const long WS_BORDER = 0X0080000L;   

        /// <summary>   

        /// window 扩展样式 分层显示   

        /// </summary>   

        public const long WS_EX_LAYERED = 0x00080000L;

        public const long WS_CHILD = 0x40000000L;

        /// <summary>   

        /// 带有alpha的样式   

        /// </summary>   

        public const long LWA_ALPHA = 0x00000002L;

        /// <summary>   

        /// 颜色设置   

        /// </summary>   

        public const long LWA_COLORKEY = 0x00000001L;

        /// <summary>   

        /// window的基本样式   

        /// </summary>   

        public const int GWL_STYLE = -16;

        /// <summary>   

        /// window的扩展样式   

        /// </summary>   

        public const int GWL_EXSTYLE = -20;

        /// <summary>   

        /// 设置窗体的样式   

        /// </summary>   

        /// <param name="handle">操作窗体的句柄</param>   

        /// <param name="oldStyle">进行设置窗体的样式类型.</param>   

        /// <param name="newStyle">新样式</param>   

        [System.Runtime.InteropServices.DllImport("User32.dll")]
        //[DllImport("User32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
      //  public static extern void SetWindowLong(IntPtr handle, int oldStyle, long newStyle);
        public static extern void SetWindowLong(IntPtr handle, int oldStyle, IntPtr newStyle);

        /// <summary>   

        /// 获取窗体指定的样式.   

        /// </summary>   

        /// <param name="handle">操作窗体的句柄</param>   

        /// <param name="style">要进行返回的样式</param>   

        /// <returns>当前window的样式</returns>   

        [System.Runtime.InteropServices.DllImport("User32.dll")]
     //   [DllImport("User32.dll", EntryPoint = "GetWindowLong",CallingConvention = CallingConvention.Cdecl)]
        public static extern long GetWindowLong(IntPtr handle, int style);

        /// <summary>   

        /// 设置窗体的工作区域.   

        /// </summary>   

        /// <param name="handle">操作窗体的句柄.</param>   

        /// <param name="handleRegion">操作窗体区域的句柄.</param>   

        /// <param name="regraw">if set to <c>true</c> [regraw].</param>   

        /// <returns>返回值</returns>   

        [System.Runtime.InteropServices.DllImport("User32.dll")]

        public static extern int SetWindowRgn(IntPtr handle, IntPtr handleRegion, bool regraw);

        /// <summary>   

        /// 创建带有圆角的区域.   

        /// </summary>   

        /// <param name="x1">左上角坐标的X值.</param>   

        /// <param name="y1">左上角坐标的Y值.</param>   

        /// <param name="x2">右下角坐标的X值.</param>   

        /// <param name="y2">右下角坐标的Y值.</param>   

        /// <param name="width">圆角椭圆的width.</param>   

        /// <param name="height">圆角椭圆的height.</param>   

        /// <returns>hRgn的句柄</returns>   

        [System.Runtime.InteropServices.DllImport("gdi32.dll")]

        public static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int width, int height);

        /// <summary>   

        /// Sets the layered window attributes.   

        /// </summary>   

        /// <param name="handle">要进行操作的窗口句柄</param>   

        /// <param name="colorKey">RGB的值</param>   

        /// <param name="alpha">Alpha的值，透明度</param>   

        /// <param name="flags">附带参数</param>   

        /// <returns>true or false</returns>   

        [System.Runtime.InteropServices.DllImport("User32.dll")]

        public static extern bool SetLayeredWindowAttributes(IntPtr handle, ulong colorKey, byte alpha, long flags);

        //=================================================================================  

        /// <summary>
        /// 设置窗体为无边框风格
        /// </summary>
        /// <param name="hWnd"></param>
        public static void SetWindowNoBorder(IntPtr hWnd)
        {

            int oldstyle = (int)NativeMethods.GetWindowLong(hWnd, NativeMethods.GWL_STYLE);

            oldstyle &= (int)(~(WS_CAPTION | WS_CAPTION_2));

            SetWindowLong(hWnd, GWL_STYLE, (IntPtr)oldstyle);

        }
    }

　　

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