C# Signature:

[DllImport("advapi32.dll", EntryPoint="CredReadW", CharSet = CharSet.Unicode, SetLastError=true)]
public static extern bool CredRead(string target, CRED_TYPE type, int reservedFlag, out IntPtr credentialPtr);

VB Signature:

Declare Function CredRead  Lib "advapi32.dll" (TODO) As TODO

User-Defined Types:

    public enum CRED_TYPE : int
    {
        GENERIC = 1,
        DOMAIN_PASSWORD = 2,
        DOMAIN_CERTIFICATE = 3,
        DOMAIN_VISIBLE_PASSWORD = 4,
        MAXIMUM = 5
    }

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
    public struct CREDENTIAL
    {
        public int flags;
        public int type;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string targetName;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string comment;
        public FILETIME lastWritten;
        public int credentialBlobSize;        
        public IntPtr credentialBlob;
        public int persist;
        public int attributeCount;
        public IntPtr credAttribute;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string targetAlias;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string userName;        
    }

Alternative Managed API:

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Notes:

None.

Tips & Tricks:

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Sample Code:

    string strTarget = "TestCred";
    CREDENTIAL cred;
    IntPtr credPtr;

    if(CredRead(strTarget, CRED_TYPE.GENERIC, 0, out credPtr))
    {
        // Get the Credential from the mem location
        cred = (CREDENTIAL)Marshal.PtrToStructure(credPtr, typeof(CREDENTIAL));

        // Get the password
        byte[] passwordBytes =  new byte[cred.credentialBlobSize];

        // Copy the memory from the blob to our array
        Marshal.Copy(cred.credentialBlob, passwordBytes , 0, cred.credentialBlobSize);

        // Convert to text
        string passwordText = Encoding.Unicode.GetString(passwordBytes);
    }

    // Clean up
    if(!credPtr.Equals(IntPtr.Zero))
    {
        Marshal.DestroyStructure(credPtr, typeof(CREDENTIAL));
        credPtr = IntPtr.Zero;                    
    }        

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