winBioWait 函式 (winbio.h)

發行項
03/09/2024

封鎖呼叫端執行，直到會話的所有擱置生物特徵辨識作業都已完成或取消為止。從 Windows 10 組建 1607 開始，此函式可用來搭配行動映射使用。

語法

HRESULT WinBioWait(
  [in] WINBIO_SESSION_HANDLE SessionHandle
);

參數

[in] SessionHandle

識別開放式生物特徵辨識會話 的WINBIO_SESSION_HANDLE 值。呼叫 WinBioOpenSession 以開啟同步會話句柄。呼叫 WinBioAsyncOpenSession 來開啟異步會話句柄。

傳回值

如果函式成功，則會傳回S_OK。如果函式失敗，它會傳回 指出錯誤的 HRESULT 值。可能的值包括 (但不限於) 下表中的這些值。如需常見錯誤碼的清單，請參閱一般 HRESULT 值。

傳回碼	Description
E_HANDLE	會話句柄無效。

備註

不論您將同步或異步會話句柄傳遞至 SessionHandle 參數，WinBioWait 都會封鎖呼叫端的線程。

不同於可以使用異步會話句柄呼叫的所有其他函式，架構不會為 WinBioWait 函式建立WINBIO_ASYNC_RESULT結構。

請勿從回呼例程的內容或可從回呼例程間接呼叫的任何函式呼叫 WinBioWait 。這樣做會導致永久死結。

請勿從視窗程式呼叫 WinBioWait 。這麼做會導致使用者介面凍結，直到事件通知送達為止。

如果您從產生視窗訊息的異步會話呼叫 WinBioWait ，則無法保證視窗訊息和從等候喚醒訊息抵達的順序。我們建議您不要撰寫任何相依於這些事件順序的程序代碼。

範例

下列程式代碼範例示範如何呼叫 WinBioWait 函式來封鎖執行，並等候異步線程完成處理。連結至Winbio.lib 靜態庫，並包含下列頭檔：

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

HRESULT CaptureSampleWithCallback(BOOL bCancel)
{
    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_RAW,            // Raw access
            NULL,                       // Array of biometric unit IDs
            0,                          // Count of biometric unit IDs
            WINBIO_DB_DEFAULT,          // Default database
            &sessionHandle              // [out] Session handle
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioOpenSession failed. hr = 0x%x\n", hr);
        goto e_Exit;
    }

    // Capture a biometric sample asynchronously.
    wprintf_s(L"\n Calling WinBioCaptureSampleWithCallback ");
    hr = WinBioCaptureSampleWithCallback(
            sessionHandle,                  // Open session handle
            WINBIO_NO_PURPOSE_AVAILABLE,    // Intended use of the sample
            WINBIO_DATA_FLAG_RAW,           // Sample format
            CaptureSampleCallback,          // Callback function
            NULL                            // Optional context
            );
    if (FAILED(hr))
    {
        wprintf_s(L"\n WinBioCaptureSampleWithCallback failed. ");
        wprintf_s(L"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...");
        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 Press any key to exit...");
    _getch();

    return hr;
}

//------------------------------------------------------------------------
// The following function is the callback for WinBioCaptureSampleWithCallback.
// The function filters the response from the biometric subsystem and 
// writes a result to the console window.
//
VOID CALLBACK CaptureSampleCallback(
    __in_opt PVOID CaptureCallbackContext,
    __in HRESULT OperationStatus,
    __in WINBIO_UNIT_ID UnitId,
    __in_bcount(SampleSize) PWINBIO_BIR Sample,
    __in SIZE_T SampleSize,
    __in WINBIO_REJECT_DETAIL RejectDetail
    )
{
    UNREFERENCED_PARAMETER(CaptureCallbackContext);

    wprintf_s(L"\n CaptureSampleCallback executing");
    wprintf_s(L"\n Swipe processed - Unit ID: %d", UnitId);

    if (FAILED(OperationStatus))
    {
        if (OperationStatus == WINBIO_E_BAD_CAPTURE)
        {
            wprintf_s(L"\n Bad capture; reason: %d\n", RejectDetail);
         }
        else
        {
            wprintf_s(L"\n WinBioCaptureSampleWithCallback failed. ");
            wprintf_s(L" OperationStatus = 0x%x\n", OperationStatus);
        }
        goto e_Exit;
    }

    wprintf_s(L"\n Captured %d bytes.\n", SampleSize);

e_Exit:

    if (Sample != NULL)
    {
        WinBioFree(Sample);
        Sample = NULL;
    }
}

規格需求

需求	值
最低支援的用戶端	Windows 7 [僅限傳統型應用程式]
最低支援的伺服器	Windows Server 2008 R2 [僅限桌面應用程式]
目標平台	Windows
標頭	winbio.h (包含Winbio.h)
程式庫	Winbio.lib
Dll	Winbio.dll