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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