PInvoike InternetGetCookieEx2 返回错误 12006

Question

我尝试使用 C# 检索 cookie，但收到错误 12006，抱怨 URL。我成功地使用

InternetGetCookieEx

检索 cookie 数据，但我需要检索当前练习的整个 cookie

我不确定是否我调用错误，或者我的标志不正确，但只有 4 个标志，其中 2 个是限制性的。我认为我的问题是需要返回的

INTERNET_COOKIE2

数组的指针。我真的被困在这里，需要一些指导。 这是我的代码

  [DllImport("wininet.dll", SetLastError = true)]
  internal static extern bool InternetGetCookieEx2(
          string url,
          string cookieName,
          Int32 dwFlags,
          INTERNET_COOKIE[] cookie,
          ref Int32 cookieCount);

  [SecurityCritical]
  public static Cookie[] GetCookieInternal(Uri uri, bool throwIfNoCookie)
  {
     int cookieCount = 0;
     string url = UriToString(uri);
     int flag = 0;

     DemandWebPermission(uri);
     //There is no error here, but cookieCount comes back as 0. If I ommit this code and
     //pass in the array directly I get the 12006 error. url is valid. I've checked multiple times
     if (CookieHelper.InternetGetCookieEx2(url, null, flag, null, ref cookieCount))  
     {
        if (cookieCount > 0)
        {
           CookieHelper.INTERNET_COOKIE[] pchCookies = new CookieHelper.INTERNET_COOKIE[cookieCount];
           if (CookieHelper.InternetGetCookieEx2(url, null, flag, pchCookies, ref cookieCount))
           {
              var result = new Cookie[cookieCount];
              for (int i = 0; i < cookieCount; i++)
              {
                 result[i] = new Cookie
                 {
                    HttpOnly = (pchCookies[i].dwFlags & (int)CookieHelper.InternetFlags.INTERNET_COOKIE_HTTPONLY) > 0,
                    Domain = pchCookies[i].pwszDomain,
                    Expired = pchCookies[i].fExpiresSet,
                    Expires = pchCookies[i].fExpiresSet ? DateTime.FromFileTime(pchCookies[i].ftExpires.dwHighDateTime) : DateTime.MinValue,
                    Name = pchCookies[i].pwszName,
                    Path = pchCookies[i].pwszPath,
                    Secure = (pchCookies[i].dwFlags & (int)CookieHelper.InternetFlags.INTERNET_COOKIE_IS_SECURE) > 0,
                    Value = pchCookies[i].pwszValue
                 };
              }
              return result;
           }
        }
     }

     int lastErrorCode = Marshal.GetLastWin32Error();

     if (throwIfNoCookie || (lastErrorCode != (int)CookieHelper.ErrorFlags.ERROR_NO_MORE_ITEMS))
     {
        throw new Win32Exception(lastErrorCode);
     }

     return null;
  }

  private static void DemandWebPermission(Uri uri)
  {
     string uriString = UriToString(uri);

     if (uri.IsFile)
     {
        string localPath = uri.LocalPath;
        new FileIOPermission(FileIOPermissionAccess.Read, localPath).Demand();
     }
     else
     {
        new WebPermission(NetworkAccess.Connect, uriString).Demand();
     }
  }

  private static string UriToString(Uri uri)
  {
     if (uri == null)
     {
        throw new ArgumentNullException("uri");
     }

     UriComponents components = (uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString);
     return new StringBuilder(uri.GetComponents(components, UriFormat.SafeUnescaped), 2083).ToString();
  }

Answer 1

您似乎将

InternetGetCookieEx

的文档与

InternetGetCookieEx

的文档混淆了。

您有很多问题：

• 返回代码是错误本身。

  InternetGetCookieEx2

  不设置最后一个错误代码，它只是返回它。
• 需要注明

  CharSet.Unicode

  。
• 指向缓冲区的指针不是您提供的。它是一个指向缓冲区的指针，您需要释放该缓冲区。 InternetGetCookieEx2 没有记录返回部分结果，您将在一次调用中获得所有内容。因此也可以不使用自动编组。您需要手动使用
PtrToStructure
• 。

[DllImport("wininet.dll", CharSet = CharSet.Unicode)]
internal static extern bool InternetGetCookieEx2(
          string? url,
          string? cookieName,
          int dwFlags,
          [Out] out IntPtr cookie,
          [Out] out int cookieCount);

[DllImport("wininet.dll")]
internal static extern void InternetFreeCookies(
          IntPtr pCookies,
          int dwCookieCount);

[SecurityCritical]
public static Cookie[] GetCookieInternal(Uri uri, bool throwIfNoCookie)
{
    string url = UriToString(uri);
    int flag = 0;

    DemandWebPermission(uri);
    var error = CookieHelper.InternetGetCookieEx2(url, null, flag, out var ptr, out var cookieCount);
    if (error != 0)
        throw new Win32Exception(error);
    if (ptr == IntPtr.Zero)
        return Array.Empty<Cookie>();

    try
    {
        var result = new Cookie[cookieCount];
        var size = Marshal.SizeOf<CookieHelper.INTERNET_COOKIE>();
        for (int i = 0; i < cookieCount; i++)
        {
            var pchCookie = Marshal.PtrToStructure<CookieHelper.INTERNET_COOKIE>(ptr + i * size)
            result[i] = new Cookie
            {
                HttpOnly = (pchCookie.dwFlags & (int)CookieHelper.InternetFlags.INTERNET_COOKIE_HTTPONLY) > 0,
                Domain = pchCookie.pwszDomain,
                Expired = pchCookie.fExpiresSet,
                Expires = pchCookie.fExpiresSet ? DateTime.FromFileTime(pchCookie.ftExpires.dwHighDateTime) : DateTime.MinValue,
                Name = pchCookie.pwszName,
                Path = pchCookie.pwszPath,
                Secure = (pchCookie.dwFlags & (int)CookieHelper.InternetFlags.INTERNET_COOKIE_IS_SECURE) > 0,
                Value = pchCookie.pwszValue
            };
        }
        return result;
    }
    finally
    {
        InternetFreeCookies(ptr, cookieCount);        
    }
}