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Showing content from https://learn.microsoft.com/en-us/windows/desktop/api/dpapi/ns-dpapi-cryptprotect_promptstruct below:

CRYPTPROTECT_PROMPTSTRUCT (dpapi.h) - Win32 apps

CRYPTPROTECT_PROMPTSTRUCT structure (dpapi.h)

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The CRYPTPROTECT_PROMPTSTRUCT structure provides the text of a prompt and information about when and where that prompt is to be displayed when using the CryptProtectData and CryptUnprotectData functions.

Syntax

typedef struct _CRYPTPROTECT_PROMPTSTRUCT {
  DWORD   cbSize;
  DWORD   dwPromptFlags;
  HWND    hwndApp;
  LPCWSTR szPrompt;
} CRYPTPROTECT_PROMPTSTRUCT, *PCRYPTPROTECT_PROMPTSTRUCT;

Members

cbSize

The size, in bytes, of this structure.

dwPromptFlags

DWORD flags that indicate when prompts to the user are to be displayed. Current dwPromptFlags values are as follows.

Value Meaning

CRYPTPROTECT_PROMPT_ON_PROTECT

This flag is used to provide the prompt for the protect phase.

CRYPTPROTECT_PROMPT_ON_UNPROTECT

This flag can be combined with CRYPTPROTECT_PROMPT_ON_PROTECT to enforce the UI (user interface) policy of the caller. When CryptUnprotectData is called, the dwPromptFlags specified in the CryptProtectData call are enforced.

hwndApp

Window handle to the parent window.

szPrompt

A string containing the text of a prompt to be displayed.

Requirements Requirement Value Minimum supported client Windows XP [desktop apps only] Minimum supported server Windows Server 2003 [desktop apps only] Header dpapi.h See also

CryptProtectData

CryptUnprotectData

Additional resources

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