IHttpCoNtext：：IndicateCompletion 方法

指出非同步工作完成，並要求 IIS 繼續在呼叫執行緒上執行。

語法

virtual VOID IndicateCompletion(  
   IN REQUEST_NOTIFICATION_STATUS notificationStatus  
) = 0;  

參數

notificationStatus
[IN]非同步作業的通知狀態。

傳回值

VOID.

備註

HTTP 模組可以使用 IndicateCompletion 方法來指出非同步作業已完成，並要求 IIS 繼續在呼叫執行緒上進行處理。 此行為與 PostCompletion 方法的行為不同，此方法會將執行排入執行緒集區。

如果 參數所 notificationStatus 指定的狀態未 REQUEST_NOTIFICATION_PENDING，要求狀態電腦將會繼續，而不會重新進入原始通知進入點。

範例

下列程式碼範例示範如何建立使用 IndicateCompletion 方法表示非同步作業已完成的 HTTP 模組。

#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 );

        // Create an HRESULT to receive return values from methods.
        HRESULT hr;

        // Create a string to return to a Web client.
        PCSTR pszBuffer = "Hello World!";
        
        // 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);
        
        // 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 completion expected flag to false.
        BOOL pfCompletionExpected = FALSE;

        // 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,TRUE,TRUE,&cbSent,&pfCompletionExpected);

        // Test for an error.
        if (FAILED(hr))
        {
            // Return the error status and exit.
            pProvider->SetErrorStatus(hr);
            return RQ_NOTIFICATION_FINISH_REQUEST;
        }

        if (TRUE == pfCompletionExpected)
        {
            // Notify IIS that an asynchronous completion is expected.
            return RQ_NOTIFICATION_PENDING;
        }

        // Flush the response to the client.
        hr = pHttpContext->GetResponse()->Flush(TRUE,FALSE,&cbSent,&pfCompletionExpected);
        
        // Test for an error.
        if (FAILED(hr))
        {
            // Return the error status and exit.
            pProvider->SetErrorStatus(hr);
            return RQ_NOTIFICATION_FINISH_REQUEST;
        }

        if (TRUE == pfCompletionExpected)
        {
            // Notify IIS that an asynchronous completion is expected.
            return RQ_NOTIFICATION_PENDING;
        }

        // End additional processing.
        return RQ_NOTIFICATION_FINISH_REQUEST;
    }
    
    REQUEST_NOTIFICATION_STATUS OnAsyncCompletion(
        IN IHttpContext* pHttpContext,
        IN DWORD dwNotification,
        IN BOOL fPostNotification,
        IN OUT IHttpEventProvider* pProvider,
        IN IHttpCompletionInfo* pCompletionInfo
    )
    {
        // Indicate completion for the operation.
        pHttpContext->IndicateCompletion(RQ_NOTIFICATION_CONTINUE);
        // Return processing to the pipeline.
        return RQ_NOTIFICATION_PENDING;
    }
};

// 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 );

    // Set the request notifications and exit.
    return pModuleInfo->SetRequestNotifications(
        new MyHttpModuleFactory,
        RQ_BEGIN_REQUEST,
        0
    );
}

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

另請參閱

IHttpCoNtext 介面
IHttpCoNtext：:P ostCompletion 方法