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internetgetcookie (wininet)
 
.
Summary
The InternetGetCookie API gets a cookie from the cache for the specified URL.

C# Signature:

[DllImport("wininet.dll", SetLastError=true)]
public static extern bool InternetGetCookie(
  string url, string cookieName, StringBuilder cookieData, ref int size);

VB Signature:

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.

Notes:

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!

C# Sample Code:

private static CookieContainer GetUriCookieContainer(Uri uri)
{
  CookieContainer cookies = null;

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

  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;
}

VB.NET Sample Code:

Private Shared Function GetUriCookieContainer(uri As Uri) As CookieContainer
    Dim cookies As CookieContainer = Nothing

    ' Determine the size of the cookie
    Dim datasize As Integer = 256
    Dim cookieData As New StringBuilder(datasize)

    If Not InternetGetCookie(uri.ToString(), Nothing, cookieData, datasize) Then
        If datasize < 0 Then
            Return Nothing
        End If

        ' Allocate stringbuilder large enough to hold the cookie
        cookieData = New StringBuilder(datasize)
        If Not InternetGetCookie(uri.ToString(), Nothing, cookieData, datasize) Then
            Return Nothing
        End If
    End If

    If cookieData.Length > 0 Then
        cookies = New CookieContainer()
        cookies.SetCookies(uri, cookieData.ToString().Replace(";", ","))
    End If
    Return cookies
End Function

Alternative Managed API:

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