PWINBIO_VERIFY_CALLBACK回呼函式 (winbio.h)

由 Windows 生物特徵辨識架構呼叫，以從異步 WinBioVerifyWithCallback 函式傳回結果。 用戶端應用程式必須實作此函式。

語法

PWINBIO_VERIFY_CALLBACK PwinbioVerifyCallback;

void PwinbioVerifyCallback(
  [in, optional] PVOID VerifyCallbackContext,
  [in]           HRESULT OperationStatus,
  [in]           WINBIO_UNIT_ID UnitId,
  [in]           BOOLEAN Match,
  [in]           WINBIO_REJECT_DETAIL RejectDetail
)
{...}

參數

[in, optional] VerifyCallbackContext

應用程式定義的緩衝區指標，並傳遞至 WinBioVerifyWithCallback 函式的 VerifyCallbackContext 參數。 此緩衝區不會由架構或生物特徵辨識單位修改。 您的應用程式可以使用數據來協助判斷要執行的動作，或維護生物特徵辨識擷取的其他資訊。

[in] OperationStatus

擷取作業傳回的錯誤碼。

[in] UnitId

生物特徵辨識單位標識碼。

[in] Match

布爾值，指定擷取的樣本是否符合 Identity 參數所指定的使用者身分識別。

[in] RejectDetail

若要執行作業，則為失敗的其他資訊。 如需詳細資訊，請參閱＜備註＞。

傳回值

無

備註

目前，Windows 生物特徵辨識架構僅支持指紋讀取器。 因此，如果作業失敗，並在 WINBIO_REJECT_DETAIL 常數中傳回其他資訊，它會是下列其中一個值：

• WINBIO_FP_TOO_HIGH
• WINBIO_FP_TOO_LOW
• WINBIO_FP_TOO_LEFT
• WINBIO_FP_TOO_RIGHT
• WINBIO_FP_TOO_FAST
• WINBIO_FP_TOO_SLOW
• WINBIO_FP_POOR_QUALITY
• WINBIO_FP_TOO_SKEWED
• WINBIO_FP_TOO_SHORT
• WINBIO_FP_MERGE_FAILURE

範例

下列函式會呼叫 WinBioVerifyWithCallback ，以異步方式判斷生物特徵辨識範例是否符合目前使用者的登入身分識別。 也會包含回呼例程 VerifyCallback 和 Helper 函式 GetCurrentUserIdentity。 連結至Winbio.lib 靜態庫，並包含下列頭檔：

• Windows.h
• Stdio.h
• Conio.h
• Winbio.h

HRESULT VerifyWithCallback(BOOL bCancel, WINBIO_BIOMETRIC_SUBTYPE subFactor)
{
    // Declare variables.
    HRESULT hr = S_OK;
    WINBIO_SESSION_HANDLE sessionHandle = NULL;
    WINBIO_UNIT_ID unitId = 0;
    WINBIO_REJECT_DETAIL rejectDetail = 0;
    WINBIO_IDENTITY identity = {0};

    // Find the identity of the user.
    hr = GetCurrentUserIdentity( &identity );
    if (FAILED(hr))
    {
        wprintf_s(L"\n User identity not found. hr = 0x%x\n", hr);
        goto e_Exit;
    }

    // Connect to the system pool. 
    hr = WinBioOpenSession( 
            WINBIO_TYPE_FINGERPRINT,    // Service provider
            WINBIO_POOL_SYSTEM,         // Pool type
            WINBIO_FLAG_DEFAULT,        // Configuration and access
            NULL,                       // Array of biometric unit IDs
            0,                          // Count of biometric unit IDs
            NULL,                       // Database ID
            &sessionHandle              // [out] Session handle
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioOpenSession failed. hr = 0x%x\n", hr);
        goto e_Exit;
    }

    // Verify a biometric sample asynchronously.
    wprintf_s(L"\n Calling WinBioVerifyWithCallback.\n");
    hr = WinBioVerifyWithCallback(
            sessionHandle,              // Open session handle
            &identity,                  // User SID or GUID
            subFactor,                  // Sample sub-factor
            VerifyCallback,             // Callback function
            NULL                        // Optional context
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioVerifyWithCallback failed. hr = 0x%x\n", hr);
        goto e_Exit;
    }
    wprintf_s(L"\n Swipe the sensor ...\n");

    // Cancel the identification if the bCancel flag is set.
    if (bCancel)
    {
        wprintf_s(L"\n Starting CANCEL timer...\n");
        Sleep( 7000 );

        wprintf_s(L"\n Calling WinBioCancel\n");
        hr = WinBioCancel( sessionHandle );
        if (FAILED(hr))
        {
            wprintf_s(L"\n WinBioCancel failed. hr = 0x%x\n", hr);
            goto e_Exit;
        }
    }

    // Wait for the asynchronous identification process to complete 
    // or be canceled.
    hr = WinBioWait( sessionHandle );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioWait failed. hr = 0x%x\n", hr);
    }

e_Exit:
    if (sessionHandle != NULL)
    {
        WinBioCloseSession(sessionHandle);
        sessionHandle = NULL;
    }

    wprintf_s(L"\n Hit any key to continue...");
    _getch();

    return hr;
}

//------------------------------------------------------------------------
// The following function is the callback for WinBioVerifyWithCallback.
// The function filters the response from the biometric subsystem and 
// writes a result to the console window.
// 
VOID CALLBACK VerifyCallback(
  __in_opt PVOID VerifyCallbackContext,
  __in HRESULT OperationStatus,
  __in WINBIO_UNIT_ID UnitId,
  __in BOOLEAN Match,
  __in WINBIO_REJECT_DETAIL RejectDetail
  )
{
    UNREFERENCED_PARAMETER(VerifyCallbackContext);
    UNREFERENCED_PARAMETER(Match);

    wprintf_s(L"\n VerifyCallback executing");
    wprintf_s(L"\n Swipe processed for unit ID %d\n", UnitId);

    // The identity could not be verified.
    if (FAILED(OperationStatus))
    {
        wprintf_s(L"\n Verification failed for the following reason:");
        if (OperationStatus == WINBIO_E_NO_MATCH)
        {
            wprintf_s(L"\n No match.\n");
        }
        else if (OperationStatus == WINBIO_E_BAD_CAPTURE)
        {
            wprintf_s(L"\n Bad capture.\n ");
            wprintf_s(L"\n Bad capture; reason: %d\n", RejectDetail);
        }
        else
        {
            wprintf_s(L"VerifyCallback failed.");
            wprintf_s(L"OperationStatus = 0x%x\n", OperationStatus); 
        }
        goto e_Exit;
    }

    // The user identity was verified.
    wprintf_s(L"\n Fingerprint verified:\n");

e_Exit:
    return;
}

//------------------------------------------------------------------------
// The following function retrieves the identity of the current user.
// This is a helper function and is not part of the Windows Biometric
// Framework API.
//
HRESULT GetCurrentUserIdentity(__inout PWINBIO_IDENTITY Identity)
{
    // Declare variables.
    HRESULT hr = S_OK;
    HANDLE tokenHandle = NULL;
    DWORD bytesReturned = 0;
    struct{
        TOKEN_USER tokenUser;
        BYTE buffer[SECURITY_MAX_SID_SIZE];
    } tokenInfoBuffer;

    // Zero the input identity and specify the type.
    ZeroMemory( Identity, sizeof(WINBIO_IDENTITY));
    Identity->Type = WINBIO_ID_TYPE_NULL;

    // Open the access token associated with the
    // current process
    if (!OpenProcessToken(
            GetCurrentProcess(),            // Process handle
            TOKEN_READ,                     // Read access only
            &tokenHandle))                  // Access token handle
    {
        DWORD win32Status = GetLastError();
        wprintf_s(L"Cannot open token handle: %d\n", win32Status);
        hr = HRESULT_FROM_WIN32(win32Status);
        goto e_Exit;
    }

    // Zero the tokenInfoBuffer structure.
    ZeroMemory(&tokenInfoBuffer, sizeof(tokenInfoBuffer));

    // Retrieve information about the access token. In this case,
    // retrieve a SID.
    if (!GetTokenInformation(
            tokenHandle,                    // Access token handle
            TokenUser,                      // User for the token
            &tokenInfoBuffer.tokenUser,     // Buffer to fill
            sizeof(tokenInfoBuffer),        // Size of the buffer
            &bytesReturned))                // Size needed
    {
        DWORD win32Status = GetLastError();
        wprintf_s(L"Cannot query token information: %d\n", win32Status);
        hr = HRESULT_FROM_WIN32(win32Status);
        goto e_Exit;
    }

    // Copy the SID from the tokenInfoBuffer structure to the
    // WINBIO_IDENTITY structure. 
    CopySid(
        SECURITY_MAX_SID_SIZE,
        Identity->Value.AccountSid.Data,
        tokenInfoBuffer.tokenUser.User.Sid
        );

    // Specify the size of the SID and assign WINBIO_ID_TYPE_SID
    // to the type member of the WINBIO_IDENTITY structure.
    Identity->Value.AccountSid.Size = GetLengthSid(tokenInfoBuffer.tokenUser.User.Sid);
    Identity->Type = WINBIO_ID_TYPE_SID;

e_Exit:

    if (tokenHandle != NULL)
    {
        CloseHandle(tokenHandle);
    }

    return hr;
}

規格需求