WinBioEnrollCaptureWithCallback 函式 (winbio.h)
以異步方式擷取生物特徵辨識範例，並將其新增至範本。 函式會立即傳回給呼叫端、在不同的線程上執行註冊，以及呼叫應用程式定義的回呼函式以更新作業狀態。
重要
建議您從 Windows 8 開始，不再使用此函式來啟動異步操作。 請改為執行下列動作：
- 實 作PWINBIO_ASYNC_COMPLETION_CALLBACK 函式，以在作業完成時接收通知。
- 呼叫 WinBioAsyncOpenSession 函 式。 在 CallbackRoutine 參數中傳遞回呼的位址。 在 NotificationMethod 參數中傳遞WINBIO_ASYNC_NOTIFY_CALLBACK。 擷取異步會話句柄。
- 使用異步會話句柄來呼叫 WinBioEnrollCapture。 當作業完成時，Windows 生物特徵辨識架構會使用結果配置和初始化 WINBIO_ASYNC_RESULT 結構，並使用結果結構的指標叫用回呼。
- 從回呼實作呼叫 WinBioFree ，以在完成使用之後釋放 WINBIO_ASYNC_RESULT 結構。
語法
HRESULT WinBioEnrollCaptureWithCallback(
[in] WINBIO_SESSION_HANDLE SessionHandle,
[in] PWINBIO_ENROLL_CAPTURE_CALLBACK EnrollCallback,
[in, optional] PVOID EnrollCallbackContext
);
參數
[in] SessionHandle
識別開放式生物特徵辨識會話 的WINBIO_SESSION_HANDLE 值。
[in] EnrollCallback
當擷取作業成功或失敗時 ，WinBioEnrollCaptureWithCallback 函式所呼叫的回呼函式位址。 您必須建立回呼。
[in, optional] EnrollCallbackContext
傳遞至回呼函式 之 EnrollCallbackContext 參數的選擇性應用程式定義結構的指標。 此結構可以包含自定義回呼函式設計用來處理的任何數據。
傳回值
如果函式成功，它會 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 |
|---|---|
|
不允許呼叫帳戶執行註冊。 |
|
會話句柄無效。 |
|
EnrollCallback 參數指定的指標不可以是 NULL。 |
備註
如果 SessionHandle 參數參考系統感測器集區，在應用程式取得視窗焦點且使用者已提供生物特徵辨識範例之前，將不會呼叫回呼函式。 取得焦點的方式取決於您正在撰寫的應用程式類型。 例如，如果您要建立 GUI 應用程式，您可以實作擷取 WM_ACTIVATE、 WM_SETFOCUS或其他適當訊息的訊息處理程式。 如果您要撰寫 CUI 應用程式，請呼叫 GetConsoleWindow 以擷取控制台視窗的句柄，並將該句柄傳遞給 SetForegroundWindow 函式，以強制控制台窗口進入前景並指派焦點。 如果您的應用程式是在中斷鏈接的進程中執行，而且沒有視窗或 Windows 服務，請使用 WinBioAcquireFocus 和 WinBioReleaseFocus 手動控制焦點。
範例
下列程式代碼範例會呼叫 WinBioEnrollCaptureWithCallback 並將指標傳遞至自定義回呼函式，以異步方式註冊指紋。 也會顯示 Callback 函式 EnrollCaptureCallback。 連結至Winbio.lib靜態庫。
//------------------------------------------------------------------------
// EnrollSystemPoolWithCallback.cpp : console application entry point.
//
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <winbio.h>
//------------------------------------------------------------------------
// Forward declarations.
//
HRESULT EnrollSysPoolWithCallback(
BOOL bCancel,
BOOL bDiscard,
WINBIO_BIOMETRIC_SUBTYPE subFactor);
VOID CALLBACK EnrollCaptureCallback(
__in_opt PVOID EnrollCallbackContext,
__in HRESULT OperationStatus,
__in WINBIO_REJECT_DETAIL RejectDetail);
typedef struct _ENROLL_CALLBACK_CONTEXT {
WINBIO_SESSION_HANDLE SessionHandle;
WINBIO_UNIT_ID UnitId;
WINBIO_BIOMETRIC_SUBTYPE SubFactor;
} ENROLL_CALLBACK_CONTEXT, *PENROLL_CALLBACK_CONTEXT;
//------------------------------------------------------------------------
int wmain()
{
HRESULT hr = S_OK;
hr = EnrollSysPoolWithCallback(
FALSE,
FALSE,
WINBIO_ANSI_381_POS_RH_INDEX_FINGER);
return 0;
}
//------------------------------------------------------------------------
// The following function enrolls a user's fingerprint in the system pool.
// The function calls WinBioEnrollCaptureWithCallback and waits for the
// asynchronous enrollment process to be completed or canceled.
//
HRESULT EnrollSysPoolWithCallback(
BOOL bCancel,
BOOL bDiscard,
WINBIO_BIOMETRIC_SUBTYPE subFactor)
{
// Declare variables
HRESULT hr = S_OK;
WINBIO_IDENTITY identity = {0};
WINBIO_SESSION_HANDLE sessionHandle = NULL;
WINBIO_UNIT_ID unitId = 0;
BOOLEAN isNewTemplate = TRUE;
ENROLL_CALLBACK_CONTEXT callbackContext = {0};
// 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 WinBioEnumBiometricUnits failed. ");
wprintf_s(L"hr = 0x%x\n", hr);
goto e_Exit;
}
// Locate the sensor.
wprintf_s(L"\n Swipe your finger to locate the sensor...\n");
hr = WinBioLocateSensor( sessionHandle, &unitId);
if (FAILED(hr))
{
wprintf_s(L"\n WinBioLocateSensor failed. hr = 0x%x\n", hr);
goto e_Exit;
}
// Begin the enrollment sequence.
hr = WinBioEnrollBegin(
sessionHandle, // Handle to open biometric session
subFactor, // Finger to create template for
unitId // Biometric unit ID
);
if (FAILED(hr))
{
wprintf_s(L"\n WinBioEnrollBegin failed. hr = 0x%x\n", hr);
goto e_Exit;
}
// Set up the custom callback context structure.
callbackContext.SessionHandle = sessionHandle;
callbackContext.UnitId = unitId;
callbackContext.SubFactor = subFactor;
// Call WinBioEnrollCaptureWithCallback. This is an asynchronous
// method that returns immediately.
hr = WinBioEnrollCaptureWithCallback(
sessionHandle, // Handle to open biometric session
EnrollCaptureCallback, // Callback function
&callbackContext // Pointer to the custom context
);
if (FAILED(hr))
{
wprintf_s(L"\n WinBioEnrollCaptureWithCallback failed. ");
wprintf_s(L"hr = 0x%x\n", hr);
goto e_Exit;
}
wprintf_s(L"\n Swipe the sensor with the appropriate finger...\n");
// Cancel the enrollment 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 enrollment process to complete
// or be canceled.
hr = WinBioWait( sessionHandle );
if (FAILED(hr))
{
wprintf_s(L"\n WinBioWait failed. hr = 0x%x\n", hr);
}
// Discard the enrollment if the bDiscard flag is set.
// Commit the enrollment if the flag is not set.
if (bDiscard)
{
wprintf_s(L"\n Discarding enrollment...\n");
hr = WinBioEnrollDiscard( sessionHandle );
if (FAILED(hr))
{
wprintf_s(L"\n WinBioLocateSensor failed. ");
wprintf_s(L"hr = 0x%x\n", hr);
}
goto e_Exit;
}
else
{
wprintf_s(L"\n Committing enrollment...\n");
hr = WinBioEnrollCommit(
sessionHandle, // Handle to open biometric session
&identity, // WINBIO_IDENTITY object for the user
&isNewTemplate); // Is this a new template
if (FAILED(hr))
{
wprintf_s(L"\n WinBioEnrollCommit failed. hr = 0x%x\n", hr);
goto e_Exit;
}
}
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 the Windows Biometric
// Framework WinBioEnrollCaptureWithCallback() function.
//
VOID CALLBACK EnrollCaptureCallback(
__in_opt PVOID EnrollCallbackContext,
__in HRESULT OperationStatus,
__in WINBIO_REJECT_DETAIL RejectDetail
)
{
// Declare variables.
HRESULT hr = S_OK;
static SIZE_T swipeCount = 1;
PENROLL_CALLBACK_CONTEXT callbackContext =
(PENROLL_CALLBACK_CONTEXT)EnrollCallbackContext;
wprintf_s(L"\n EnrollCaptureCallback executing\n");
wprintf_s(L"\n Sample %d captured", swipeCount++);
// The capture was not acceptable or the enrollment operation
// failed.
if (FAILED(OperationStatus))
{
if (OperationStatus == WINBIO_E_BAD_CAPTURE)
{
wprintf_s(L"\n Bad capture; reason: %d\n", RejectDetail);
wprintf_s(L"\n Swipe your finger to capture another sample.\n");
// Try again.
hr = WinBioEnrollCaptureWithCallback(
callbackContext->SessionHandle, // Open session handle
EnrollCaptureCallback, // Callback function
EnrollCallbackContext // Callback context
);
if (FAILED(hr))
{
wprintf_s(L"WinBioEnrollCaptureWithCallback failed.");
wprintf_s(L"hr = 0x%x\n", hr);
}
}
else
{
wprintf_s(L"EnrollCaptureCallback failed.");
wprintf_s(L"OperationStatus = 0x%x\n", OperationStatus);
}
goto e_Exit;
}
// The enrollment operation requires more fingerprint swipes.
// This is normal and depends on your hardware. Typically, at least
// three swipes are required.
if (OperationStatus == WINBIO_I_MORE_DATA)
{
wprintf_s(L"\n More data required.");
wprintf_s(L"\n Swipe your finger on the sensor again.");
hr = WinBioEnrollCaptureWithCallback(
callbackContext->SessionHandle,
EnrollCaptureCallback,
EnrollCallbackContext
);
if (FAILED(hr))
{
wprintf_s(L"WinBioEnrollCaptureWithCallback failed. ");
wprintf_s(L"hr = 0x%x\n", hr);
}
goto e_Exit;
}
wprintf_s(L"\n Template completed\n");
e_Exit:
return;
}
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 |
另請參閱
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