ISCPSecureQuery::MakeDecision method (mswmdm.h)

Article
10/13/2021

The MakeDecision method determines whether access to the content is allowed. If access is allowed, this method returns the interface that will be used to access the content.

Syntax

HRESULT MakeDecision(
  [in]      UINT                fuFlags,
  [in]      BYTE                *pData,
  [in]      DWORD               dwSize,
  [in]      DWORD               dwAppSec,
  [in]      BYTE                *pbSPSessionKey,
  [in]      DWORD               dwSessionKeyLen,
  [in]      IMDSPStorageGlobals *pStorageGlobals,
  [out]     ISCPSecureExchange  **ppExchange,
  [in, out] BYTE [8]            abMac
);

Parameters

[in] fuFlags

Flags describing the data offered to the secure content provider for making decisions. This parameter must be included in the input message authentication code. The following flags can be present.

Flag	Description
WMDM_SCP_DECIDE_DATA	The pData parameter points to data to be examined.
WMDM_MODE_TRANSFER_PROTECTED	The output object data from the ISCPSecureExchange interface must be protected. If Windows Media Device Manager sets neither or both mode flags, DRM decides whether the output object data from the ISCPSecureExchange interface must be protected or unprotected.
WMDM_MODE_TRANSFER_UNPROTECTED	The output object data from the ISCPSecureExchange interface must be unprotected. If Windows Media Device Manager sets neither or both mode flags, DRM decides whether the output object data from the ISCPSecureExchange interface must be protected or unprotected.

[in] pData

Pointer to a data object containing the data to be examined. This parameter must be included in the input message authentication code and must be encrypted.

[in] dwSize

DWORD that contains the length, in bytes, of the data to be examined. This parameter must be included in the input message authentication code.

[in] dwAppSec

DWORD that indicates the current level of security of Windows Media Device Manager. This is the smaller of the current security levels of the application and the target service provider. This parameter must be included in the input message authentication code.

[in] pbSPSessionKey

Pointer to an array of bytes containing the session key for securing communication with the service provider to which pStgGlobals points. This parameter must be included in the input message authentication code and must be encrypted.

[in] dwSessionKeyLen

Length of the byte array to which pbSPSessionKey points. This parameter must be included in the input message authentication code.

[in] pStorageGlobals

Pointer to the IWMDMStorageGlobals interface on the root storage of the media or device to or from which the file is being transferred. This parameter must be included in the input message authentication code.

[out] ppExchange

Pointer to an exchange object that receives the exchange interface.

[in, out] abMac

Array of eight bytes containing the message authentication code for the parameter data of this method. (WMDM_MAC_LENGTH is defined as 8.)

Return value

If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.

Return code	Description
WMDM_E_CALL_OUT_OF_SEQUENCE	This method was called out of sequence.
WMDM_E_MAC_CHECK_FAILED	The message authentication code is not valid.
WMDM_E_MOREDATA	Windows Media Device Manager must call this method again with another packet of data. The size of the packet is determined by the pdwMinDecisionData parameter in the ISCPSecureQuery::GetDataDemands method.
S_FALSE	The caller does not have the rights required to perform the requested transfer.
E_INVALIDARG	A parameter is invalid or is a NULL pointer.
E_FAIL	An unspecified error occurred.

Remarks

This method is called after the ISCPSecureQuery::ExamineData method, and makes the final decision whether access to the content is allowed.

Requirements

Requirement	Value
Target Platform	Windows
Header	mswmdm.h
Library	Mssachlp.lib