WinBioIdentifyWithCallback 函数 (winbio.h)

项目
08/27/2023

异步捕获生物识别样本，并确定它是否与现有生物识别模板匹配。函数立即返回给调用方，在单独的线程上执行捕获和标识，并调用应用程序定义的回调函数以更新操作状态。

重要说明

建议从 Windows 8 开始，不再使用此函数来启动异步操作。请改为执行以下操作：

实现 PWINBIO_ASYNC_COMPLETION_CALLBACK 函数，以在操作完成时接收通知。
调用 WinBioAsyncOpenSession 函数。在 CallbackRoutine 参数中传递回调的地址。在 NotificationMethod 参数中传递WINBIO_ASYNC_NOTIFY_CALLBACK。检索异步会话句柄。
使用异步会话句柄调用 WinBioIdentify。操作完成后，Windows 生物识别框架将使用结果分配和初始化 WINBIO_ASYNC_RESULT 结构，并使用指向结果结构的指针调用回调。
从回调实现调用 WinBioFree ，以在使用完 WINBIO_ASYNC_RESULT 结构后释放它。

语法

HRESULT WinBioIdentifyWithCallback(
  [in]           WINBIO_SESSION_HANDLE     SessionHandle,
  [in]           PWINBIO_IDENTIFY_CALLBACK IdentifyCallback,
  [in, optional] PVOID                     IdentifyCallbackContext
);

参数

[in] SessionHandle

标识打开的生物识别会话 的WINBIO_SESSION_HANDLE 值。

[in] IdentifyCallback

标识成功或失败时由 WinBioIdentifyWithCallback 函数调用的回调函数的地址。必须创建回调。

[in, optional] IdentifyCallbackContext

指向应用程序定义的数据结构的指针，该结构传递给其 IdentifyCallbackContext 参数中的回调函数。此结构可以包含自定义回调函数旨在处理的任何数据。

返回值

如果函数成功，则返回 S_OK。如果函数失败，它将返回指示错误的 HRESULT 值。可能的值包括（但并不限于）下表中的项。有关常见错误代码的列表，请参阅常见 HRESULT 值。

返回代码	说明
E_HANDLE	会话句柄无效。
E_POINTER	SessionHandle 和 IdentifyCallback 参数不能为 NULL。

注解

回调例程必须具有以下签名：

VOID CALLBACK IdentifyCallback(
__in_opt PVOID IdentifyCallbackContext,
__in HRESULT OperationStatus,
__in WINBIO_UNIT_ID UnitId,
__in WINBIO_IDENTITY *Identity,
__in WINBIO_BIOMETRIC_SUBTYPE SubFactor,
__in WINBIO_REJECT_DETAIL RejectDetail
);

示例

下面的代码示例调用 WinBioIdentifyWithCallback 以识别生物识别扫描中的用户。 WinBioIdentifyWithCallback 是一个异步函数，用于配置生物识别子系统以在另一个线程上处理生物识别输入。然后，生物识别子系统的输出将发送到名为 IdentifyCallback 的自定义回调函数。链接到 Winbio.lib 静态库并包含以下头文件：

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

HRESULT IdentifyWithCallback(BOOL bCancel)
{
    // Declare variables.
    HRESULT hr = S_OK;
    WINBIO_SESSION_HANDLE sessionHandle = NULL;

    // 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 
            WINBIO_DB_DEFAULT,          // Database ID 
            &sessionHandle              // [out] Session handle
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioOpenSession failed. hr = 0x%x\n", hr);
        goto e_Exit;
    }

    // Call WinBioIdentifyWithCallback. The method is asynchronous
    // and returns immediately.
    wprintf_s(L"\n Calling WinBioIdentifyWithCallback");
    wprintf_s(L"\n Swipe the sensor ...\n");
    hr = WinBioIdentifyWithCallback( 
            sessionHandle,              // Open biometric session
            IdentifyCallback,           // Callback function
            NULL                        // Optional context
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioIdentifyWithCallback failed. hr = 0x%x\n", hr);
        goto e_Exit;
    }

    // Cancel user 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)
    {
       wprintf_s(L"\n Closing the session.\n");

        hr = WinBioCloseSession(sessionHandle);
        if (FAILED(hr))
        {
            wprintf_s(L"\n WinBioCloseSession failed. hr = 0x%x\n", hr);
        }
        sessionHandle = NULL;
    }

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

    return hr;
}

//------------------------------------------------------------------------
// The following function is the callback for WinBioIdentifyWithCallback.
// The function filters the response from the biometric subsystem and 
// writes a result to the console window.
// 
VOID CALLBACK IdentifyCallback(
    __in_opt PVOID IdentifyCallbackContext,
    __in HRESULT OperationStatus,
    __in WINBIO_UNIT_ID UnitId,
    __in WINBIO_IDENTITY *Identity,
    __in WINBIO_BIOMETRIC_SUBTYPE SubFactor,
    __in WINBIO_REJECT_DETAIL RejectDetail
    )
{
    UNREFERENCED_PARAMETER(IdentifyCallbackContext);
    UNREFERENCED_PARAMETER(Identity);

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

    // The attempt to process the fingerprint failed.
    if (FAILED(OperationStatus))
    {
        if (OperationStatus == WINBIO_E_UNKNOWN_ID)
        {
            wprintf_s(L"\n Unknown identity.\n");
        }
        else if (OperationStatus == WINBIO_E_BAD_CAPTURE)
        {
            wprintf_s(L"\n Bad capture; reason: %d\n", RejectDetail);
        }
        else
        {
            wprintf_s(L"IdentifyCallback failed.");
            wprintf_s(L"OperationStatus = 0x%x\n", OperationStatus); 
        }
    }
    // Processing succeeded and the finger swiped is written
    // to the console window.
    else
    {
        wprintf_s(L"\n The following finger was used:");
        switch (SubFactor)
        {
            case WINBIO_SUBTYPE_NO_INFORMATION:
                wprintf_s(L"\n No information\n");
                break;
            case WINBIO_ANSI_381_POS_RH_THUMB:
                wprintf_s(L"\n RH thumb\n");
                break;
            case WINBIO_ANSI_381_POS_RH_INDEX_FINGER:
                wprintf_s(L"\n RH index finger\n");
                break;
            case WINBIO_ANSI_381_POS_RH_MIDDLE_FINGER:
                wprintf_s(L"\n RH middle finger\n");
                break;
            case WINBIO_ANSI_381_POS_RH_RING_FINGER:
                wprintf_s(L"\n RH ring finger\n");
                break;
            case WINBIO_ANSI_381_POS_RH_LITTLE_FINGER:
                wprintf_s(L"\n RH little finger\n");
                break;
            case WINBIO_ANSI_381_POS_LH_THUMB:
                wprintf_s(L"\n LH thumb\n");
                break;
            case WINBIO_ANSI_381_POS_LH_INDEX_FINGER:
                wprintf_s(L"\n LH index finger\n");
                break;
            case WINBIO_ANSI_381_POS_LH_MIDDLE_FINGER:
                wprintf_s(L"\n LH middle finger\n");
                break;
            case WINBIO_ANSI_381_POS_LH_RING_FINGER:
                wprintf_s(L"\n LH ring finger\n");
                break;
            case WINBIO_ANSI_381_POS_LH_LITTLE_FINGER:
                wprintf_s(L"\n LH little finger\n");
                break;
            case WINBIO_SUBTYPE_ANY:
                wprintf_s(L"\n Any finger\n");
                break;
            default:
                break;
        }
    }
}

要求


最低受支持的客户端	Windows 7 [仅限桌面应用]
最低受支持的服务器	Windows Server 2008 R2 [仅限桌面应用]
目标平台	Windows
标头	winbio.h (包括 Winbio.h)
Library	Winbio.lib
DLL	Winbio.dll

另请参阅

WinBioIdentify

通过

WinBioIdentifyWithCallback 函数 (winbio.h)

语法

参数

返回值

注解

示例

要求

另请参阅

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