擷取目前模組主機的下一個通知。
語法
virtual BOOL GetNextNotification(
IN REQUEST_NOTIFICATION_STATUS status,
OUT DWORD* pdwNotification,
OUT BOOL* pfIsPostNotification,
OUT CHttpModule** ppModuleInfo,
OUT IHttpEventProvider** ppRequestOutput
) = 0;
參數
status
[IN]要從目前通知傳回 的REQUEST_NOTIFICATION_STATUS 列舉值。
pdwNotification
[OUT]的指標 DWORD ,其中包含下一個通知的位元遮罩值。
pfIsPostNotification
[OUT]布林值的指標。 true 表示通知為通知後通知;否則為 false 。
ppModuleInfo
[OUT] CHttpModule 類別位址的指標,負責處理傳回的通知。
ppRequestOutput
[OUT]傳回通知之 IHttpEventProvider 介面位址的指標。
傳回值
true 如果 的呼叫 GetNextNotification 成功,則為 ,否則為 false 。
備註
HTTP 模組可以使用 GetNextNotification 方法來合併相同模組主機內的通知。 將處理傳回至整合式要求處理管線需要少量的額外負荷。 若要略過該額外負荷,HTTP 模組可以呼叫 GetNextNotification 方法來跳到下一個通知並繼續處理,前提是這兩個通知位於相同的模組主機內,而且不會註冊其他通知處理常式來處理通知之間的要求。
例如,HTTP 模組可能包含 OnResolveRequestCache 方法,而相同模組主機內的另一個 HTTP 模組可能包含 OnPostResolveRequestCache 方法。 第一個模組可以呼叫 GetNextNotification 方法以繼續處理,而不是將處理傳回至管線,就像模組已註冊 OnPostResolveRequestCache 事件後通知方法一樣。
注意
如果 的 GetNextNotification 呼叫傳 false 回 ,您可以啟用失敗的要求追蹤規則,讓您檢查 IIS 正在處理的通知。
範例
下列程式碼範例示範如何建立執行下列工作的 HTTP 模組:
註冊數個通知。
建立呼叫 方法的
GetNextNotification協助程式方法,該方法會嘗試跳至下一個通知。針對每個已註冊的通知,定義呼叫協助程式方法的通知處理常式,然後將傳回狀態顯示給用戶端。
#define _WINSOCKAPI_
#include <windows.h>
#include <sal.h>
#include <httpserv.h>
// Create the module class.
class MyHttpModule : public CHttpModule
{
public:
REQUEST_NOTIFICATION_STATUS
OnBeginRequest(
IN IHttpContext * pHttpContext,
IN IHttpEventProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pProvider );
// Clear the existing response.
pHttpContext->GetResponse()->Clear();
// Set the MIME type to plain text.
pHttpContext->GetResponse()->SetHeader(
HttpHeaderContentType,"text/plain",
(USHORT)strlen("text/plain"),TRUE);
// Return processing to the pipeline.
return RQ_NOTIFICATION_CONTINUE;
}
REQUEST_NOTIFICATION_STATUS
OnAuthenticateRequest(
IN IHttpContext * pHttpContext,
IN IAuthenticationProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pProvider );
// Attempt to retrieve the next notification and display the result.
GetNotificationAndDisplayResult(
pHttpContext,"OnAuthenticateRequest\n");
// Return processing to the pipeline.
return RQ_NOTIFICATION_CONTINUE;
}
REQUEST_NOTIFICATION_STATUS
OnPostAuthenticateRequest(
IN IHttpContext * pHttpContext,
IN IHttpEventProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pProvider );
// Attempt to retrieve the next notification and display the result.
GetNotificationAndDisplayResult(
pHttpContext,"\nOnPostAuthenticateRequest\n");
// Return processing to the pipeline.
return RQ_NOTIFICATION_CONTINUE;
}
REQUEST_NOTIFICATION_STATUS
OnAuthorizeRequest(
IN IHttpContext * pHttpContext,
IN IHttpEventProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pProvider );
// Attempt to retrieve the next notification and display the result.
GetNotificationAndDisplayResult(
pHttpContext,"\nOnAuthorizeRequest\n");
// Return processing to the pipeline.
return RQ_NOTIFICATION_CONTINUE;
}
REQUEST_NOTIFICATION_STATUS
OnPostAuthorizeRequest(
IN IHttpContext * pHttpContext,
IN IHttpEventProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pProvider );
// Attempt to retrieve the next notification and display the result.
GetNotificationAndDisplayResult(
pHttpContext,"\nOnPostAuthorizeRequest\n");
// Return processing to the pipeline.
return RQ_NOTIFICATION_CONTINUE;
}
REQUEST_NOTIFICATION_STATUS
OnMapRequestHandler(
IN IHttpContext * pHttpContext,
IN IMapHandlerProvider * pProvider
)
{
UNREFERENCED_PARAMETER( pHttpContext );
UNREFERENCED_PARAMETER( pProvider );
// End additional processing.
return RQ_NOTIFICATION_FINISH_REQUEST;
}
private:
// Create a helper method that attempts to retrieve the next
// notification and returns the status to a Web client.
void GetNotificationAndDisplayResult(
IHttpContext * pHttpContext,
PCSTR pszBuffer
)
{
DWORD dwNotification = 0;
BOOL fPostNotification = FALSE;
CHttpModule * pHttpModule = NULL;
IHttpEventProvider * pEventProvider = NULL;
char szBuffer[256]="";
// Attempt to retrive the next notification.
BOOL fReturn = pHttpContext->GetNextNotification(
RQ_NOTIFICATION_CONTINUE,
&dwNotification,&fPostNotification,
&pHttpModule,&pEventProvider);
// Return the name of the notification to a Web client.
WriteResponseMessage(pHttpContext,pszBuffer);
// Return the status of the GetNextNotification method to a Web client.
sprintf_s(szBuffer,255,"\tGetNextNotification return value: %s\n",
fReturn==TRUE?"true":"false");
WriteResponseMessage(pHttpContext,szBuffer);
// Return the notification bitmask to a Web client.
sprintf_s(szBuffer,255,"\tNotification: %08x\n",dwNotification);
WriteResponseMessage(pHttpContext,szBuffer);
// Return whether the notification is a post-notification.
sprintf_s(szBuffer,255,"\tPost-notification: %s\n",
fPostNotification==TRUE?"Yes":"No");
WriteResponseMessage(pHttpContext,szBuffer);
}
// Create a utility method that inserts a string value into the response.
HRESULT WriteResponseMessage(
IHttpContext * pHttpContext,
PCSTR pszBuffer
)
{
// Create an HRESULT to receive return values from methods.
HRESULT hr;
// Create a data chunk. (Defined in the Http.h file.)
HTTP_DATA_CHUNK dataChunk;
// Set the chunk to a chunk in memory.
dataChunk.DataChunkType = HttpDataChunkFromMemory;
// Buffer for bytes written of data chunk.
DWORD cbSent;
// Set the chunk to the buffer.
dataChunk.FromMemory.pBuffer =
(PVOID) pszBuffer;
// Set the chunk size to the buffer size.
dataChunk.FromMemory.BufferLength =
(USHORT) strlen(pszBuffer);
// Insert the data chunk into the response.
hr = pHttpContext->GetResponse()->WriteEntityChunks(
&dataChunk,1,FALSE,TRUE,&cbSent);
// Test for an error.
if (FAILED(hr))
{
// Return the error status.
return hr;
}
// Return a success status.
return S_OK;
}
};
// Create the module's class factory.
class MyHttpModuleFactory : public IHttpModuleFactory
{
public:
HRESULT
GetHttpModule(
OUT CHttpModule ** ppModule,
IN IModuleAllocator * pAllocator
)
{
UNREFERENCED_PARAMETER( pAllocator );
// Create a new instance.
MyHttpModule * pModule = new MyHttpModule;
// Test for an error.
if (!pModule)
{
// Return an error if we cannot create the instance.
return HRESULT_FROM_WIN32( ERROR_NOT_ENOUGH_MEMORY );
}
else
{
// Return a pointer to the module.
*ppModule = pModule;
pModule = NULL;
// Return a success status.
return S_OK;
}
}
void Terminate()
{
// Remove the class from memory.
delete this;
}
};
// Create the module's exported registration function.
HRESULT
__stdcall
RegisterModule(
DWORD dwServerVersion,
IHttpModuleRegistrationInfo * pModuleInfo,
IHttpServer * pGlobalInfo
)
{
UNREFERENCED_PARAMETER( dwServerVersion );
UNREFERENCED_PARAMETER( pGlobalInfo );
return pModuleInfo->SetRequestNotifications(
new MyHttpModuleFactory,
RQ_BEGIN_REQUEST | RQ_AUTHENTICATE_REQUEST |
RQ_AUTHORIZE_REQUEST | RQ_MAP_REQUEST_HANDLER,
RQ_AUTHENTICATE_REQUEST | RQ_AUTHORIZE_REQUEST
);
}
您的模組必須匯出 RegisterModule 函式。 您可以為專案建立模組定義 (.def) 檔案,或使用 參數編譯模組 /EXPORT:RegisterModule 來匯出此函式。 如需詳細資訊,請參閱 逐步解說:使用機器碼建立 Request-Level HTTP 模組。
您可以選擇性地使用呼叫慣例編譯器代碼, __stdcall (/Gz) 而不是明確宣告每個函式的呼叫慣例。
規格需求
| 類型 | 描述 |
|---|---|
| Client | - Windows Vista 上的 IIS 7.0 - Windows 7 上的 IIS 7.5 - Windows 8 上的 IIS 8.0 - Windows 10上的 IIS 10.0 |
| 伺服器 | - Windows Server 2008 上的 IIS 7.0 - Windows Server 2008 R2 上的 IIS 7.5 - Windows Server 2012 上的 IIS 8.0 - Windows Server 2012 R2 上的 IIS 8.5 - Windows Server 2016上的 IIS 10.0 |
| 產品 | - IIS 7.0、IIS 7.5、IIS 8.0、IIS 8.5、IIS 10.0 - IIS Express 7.5、IIS Express 8.0、IIS Express 10.0 |
| 標頭 | Httpserv.h |