C# Signature:

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);
[DllImport("wininet.dll", SetLastError=true)]
public static extern bool InternetGetCookie(
  string url, string cookieName, StringBuilder cookieData, ref int size);

VB Signature:

Declare Function InternetGetCookieEx Lib "wininet.dll" Alias "InternetGetCookieExA" (ByVal pchURL As String, ByVal pchCookieName As String, _
    ByVal pchCookieData As System.Text.StringBuilder, ByRef pcchCookieData As Integer, ByVal flags As Integer, ByVal reserved As Integer) As _
    <System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)> Boolean

Declare Auto Function InternetGetCookie Lib "wininet.dll" ( _
     ByVal lpszUrlName As String, ByVal lpszCookieName As String, _
     ByVal lpszCookieData As String, ByRef lpdwSize As Integer) As Boolean

User-Defined Types:

None.

Alternative Managed API:

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Notes:

None.

You can pass null (Nothing in Visual Basic) to the lpszCookieData parameter to get the require buffer size from the lpdwSize parameter.

Tips & Tricks:

Please add some!

Sample Code:

    //取当前webBrowser登录后的Cookie值  
    [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);
private static CookieContainer GetUriCookieContainer(Uri uri)
{
  CookieContainer cookies = null;

  // Determine the size of the cookie
  int datasize = 256;
  StringBuilder cookieData = new StringBuilder(datasize);

    //取出Cookie，当登录后才能取    
    private static string GetCookieString(string url)
    {
        // Determine the size of the cookie      
        UInt32 datasize = 256*1024;
        StringBuilder cookieData = new StringBuilder(Convert.ToInt32(datasize));
        if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, IntPtr.Zero))
        {
        if (datasize < 0)
            return null;
        // Allocate stringbuilder large enough to hold the cookie    
        cookieData = new StringBuilder(Convert.ToInt32(datasize));
        if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, IntPtr.Zero))
            return null;
        }
        return cookieData.ToString();
    }
  if (!InternetGetCookie(uri.ToString(), null, cookieData,
    ref datasize))
  {
    if (datasize < 0)
      return null;

    // Allocate stringbuilder large enough to hold the cookie
    cookieData = new StringBuilder(datasize);
    if ( !InternetGetCookie(uri.ToString(), null, cookieData,
      ref datasize) )
      return null;
  }

  if (cookieData.Length > 0)
  {
    cookies = new CookieContainer();
    cookies.SetCookies(uri, cookieData.ToString().Replace(';', ','));
  }
  return cookies;
}

Alternative Managed API:

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