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ICredentialProviderCredential::GetStringValue method (credentialprovider.h)

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Enables retrieval of text from a credential with a text field.

Syntax

HRESULT GetStringValue(
  [in]  DWORD  dwFieldID,
  [out] LPWSTR *ppsz
);

Parameters

[in] dwFieldID

Type: DWORD

The identifier for the field.

[out] ppsz

Type: LPWSTR*

A pointer to the memory containing a null-terminated Unicode string to return to the Logon UI or Credential UI.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

This method is optional.

The Logon UI and Credential UI us this method to obtain the pszLabel for a field. This information is necessary to get values for CPFT_LARGE_TEXT, CPFT_SMALL_TEXT, CPFT_COMMAND_LINK, CPFT_EDIT_TEXT, and CPFT_PASSWORD_TEXT fields.

Credential Provider Best Practices

Credential providers handle extremely sensitive user secrets in order to complete logon and unlock requests. As a best practice, secret information such as passwords and PINs should be handled with the utmost care. Proper techniques for handling secret information within a credential provider are:
  • Always securely discard secrets. To do this, call SecureZeroMemory before freeing the memory used to hold any secret.
  • Securely discard secrets promptly after they are used.
  • Securely discard secrets if they are not used for their intended purpose within an expected amount of time.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header credentialprovider.h