Cannot add wintrust.dll

Now I'm working on a project automatically check out whether the file is digital signed, using the wintrust.dll. Below is the colde

[DllImport("wintrust.dll", ExactSpelling = true, SetLastError = false, CharSet = CharSet.Unicode)]
static extern WinVerifyTrustResult WinVerifyTrust(
    [In] IntPtr hwnd,
    [In] [MarshalAs(UnmanagedType.LPStruct)] Guid pgActionID,
    [In] WinTrustData pWVTData
);

开发者_C百科

But there is error message about the class WinVerityTrustResult and WinTrustData class that they cannot be found. I tried to add the reference wintrust.dll and had registered it, but it prompt that I can't add the wintrust.dll.

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You appear to have copied the function declaration from pinvoke.net. You also need to include the user defined types declared further down that page.