Metode IHttpServer::AssociateWithThreadPool

Mengaitkan operasi penyelesaian asinkron dengan kumpulan utas.

Sintaks

virtual HRESULT AssociateWithThreadPool(  
   IN HANDLE hHandle,  
   IN LPOVERLAPPED_COMPLETION_ROUTINE completionRoutine  
) = 0;

Parameter

hHandle
[IN] A HANDLE untuk operasi asinkron.

completionRoutine
[IN] Penunjuk LPOVERLAPPED_COMPLETION_ROUTINE fungsi.

Tampilkan Nilai

Sebuah HRESULT. Nilai yang mungkin termasuk, tetapi tidak terbatas pada, yang ada dalam tabel berikut.

Nilai	Deskripsi
S_OK	Menunjukkan bahwa operasi berhasil.

Keterangan

Pengembang dapat menggunakan AssociateWithThreadPool metode untuk mengaitkan handel untuk operasi input/output asinkron dengan kumpulan utas IIS. Karena operasi asinkron yang terkait dengan handel tersebut akan selesai dalam kumpulan utas IIS, metode ini AssociateWithThreadPool memungkinkan Anda untuk melakukan serangkaian operasi asinkron tanpa mempertahankan kumpulan utas Anda sendiri.

Contoh

Contoh kode berikut menunjukkan cara menggunakan AssociateWithThreadPool metode untuk membuat modul HTTP yang membuat kondisi yang memerlukan operasi input/output asinkron dan mengaitkan rutinitas penyelesaian asinkron dengan kumpulan utas IIS.

#define _WINSOCKAPI_
#include <windows.h>
#include <sal.h>
#include <httpserv.h>

// Create a pointer for the global server interface.
IHttpServer * g_pGlobalInfo = NULL;

// Create a global file handle.
HANDLE g_hFile = NULL;

// Create a utility method for asynchronous completion.
VOID
__stdcall
MyCompletionRoutine(
    DWORD dwErrorCode,
    DWORD dwNumberOfBytesTransfered,
    LPOVERLAPPED lpOverlapped)
{
    if ((g_hFile != NULL) && (g_hFile != INVALID_HANDLE_VALUE))
    {
        CloseHandle(g_hFile);
    }    
    return;
}

// Create the module class.
class MyHttpModule : public CHttpModule
{

public:
    REQUEST_NOTIFICATION_STATUS
    OnSendResponse(
        IN IHttpContext * pHttpContext,
        IN ISendResponseProvider * pProvider
    )
    {
        UNREFERENCED_PARAMETER( pHttpContext );
        UNREFERENCED_PARAMETER( pProvider );

        BOOL fAuthenticated = FALSE;

        // Retrieve an IHttpUser interface.
        IHttpUser * pHttpUser = pHttpContext->GetUser();
        char * pszUserName = NULL;
        PCWSTR pwszUserName = NULL;

        // Test for an error.
        if (pHttpUser != NULL)
        {
            // Retrieve the user name.
            pwszUserName = pHttpUser->GetUserName();
            // Test for an error.
            if (pwszUserName!=NULL)
            {
                // Test for anonymous user.
                if (wcslen(pwszUserName)>0)
                {
                    // Set the flag to indicate an authenticated user.
                    fAuthenticated = TRUE;
                }
            }
        }

        // Test for an authenticated user.
        if (fAuthenticated == FALSE)
        {
            // Clear the existing response.
            pHttpContext->GetResponse()->Clear();
            // Return an access denied message.
            pHttpContext->GetResponse()->SetStatus(401,"Access denied.",0,0);
            // End additional processing.
            return RQ_NOTIFICATION_FINISH_REQUEST;
        }

        g_hFile = CreateFile(TEXT("d:\\inetpub\\wwwroot\\myfile.txt"),
            GENERIC_WRITE,0,NULL,CREATE_ALWAYS,
            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
        
        if (g_hFile == INVALID_HANDLE_VALUE) 
        { 
            char szBuffer[256] = "";
            sprintf_s(szBuffer,256,"Could not open file (error %d)\n", GetLastError());
            WriteResponseMessage(pHttpContext,szBuffer);
            return RQ_NOTIFICATION_FINISH_REQUEST;
        }
        else
        {
            OVERLAPPED oOverlapped;
            oOverlapped.hEvent = NULL;
            oOverlapped.Offset = 0;
            oOverlapped.OffsetHigh = 0;
            DWORD dwBytesWritten = 0;
            g_pGlobalInfo->AssociateWithThreadPool(g_hFile,&MyCompletionRoutine);
            //pszUserName = (char*) pHttpContext->AllocateRequestMemory( (DWORD) wcslen(pwszUserName)+1 );
            //wcstombs(pszUserName,pwszUserName,wcslen(pwszUserName));
            //WriteFile(g_hFile, pszUserName, strlen(pszUserName), &dwBytesWritten, &oOverlapped);
            WriteFile(g_hFile, "Hello", strlen("Hello"), &dwBytesWritten, oOverlapped);
            return RQ_NOTIFICATION_PENDING;
        }
    }

private:

    // 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 the factory 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 );

    // Store the pointer for the global server interface.
    g_pGlobalInfo = pGlobalInfo;

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

Modul Anda harus mengekspor fungsi RegisterModule . Anda dapat mengekspor fungsi ini dengan membuat file definisi modul (.def) untuk proyek Anda, atau Anda dapat mengkompilasi modul dengan menggunakan sakelar /EXPORT:RegisterModule . Untuk informasi selengkapnya, lihat Panduan: Membuat Modul HTTP Request-Level Dengan Menggunakan Kode Asli.

Anda dapat secara opsional mengkompilasi kode dengan menggunakan __stdcall (/Gz) konvensi panggilan alih-alih secara eksplisit mendeklarasikan konvensi panggilan untuk setiap fungsi.

Persyaratan

Jenis	Deskripsi
Klien	- IIS 7.0 di Windows Vista - IIS 7.5 di Windows 7 - IIS 8.0 di Windows 8 - IIS 10.0 pada Windows 10
Server	- IIS 7.0 di Windows Server 2008 - IIS 7.5 di Windows Server 2008 R2 - IIS 8.0 di Windows Server 2012 - IIS 8.5 di Windows Server 2012 R2 - IIS 10.0 di Windows Server 2016
Produk	- 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
Header	Httpserv.h

Lihat juga

Antarmuka IHttpServer

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Last updated on 2023-07-19