IFileKey 介面

表示存取全域檔案快取中相關聯資料的重要資訊。

Syntax

class IFileKey : public IHttpCacheKey  

方法

下表列出 介面所 IFileKey 公開的方法。

衍生類別

此介面不包含任何衍生類別。

備註

介面透過 IFileKeyIFileKey：：GetPath方法新增傳回檔案絕對實體路徑的支援，藉此擴充IHttpCacheKey介面。 IFileKey也會透過IFileKey：：GetCacheName方法提供預設實作，以覆寫IHttpCacheKey：：GetCacheName方法。

實作者的注意事項

對於實作 IFileKey 介面的每個非抽象類別，您必須在 方法中 GetHash 提供雜湊碼，以將指標資料對應 IFileKey 至該資料的唯 DWORD 一值。

範例

下列程式碼範例示範如何建立全域模組，以接聽GL_CACHE_OPERATION和GL_CACHE_CLEANUP事件，然後將資訊寫入 IFileKey 事件檢視器。

#pragma warning( disable : 4290 )
#pragma warning( disable : 4530 )

#define _WINSOCKAPI_
#include <windows.h>
#include <sal.h>
#include <tchar.h>
#include <initguid.h>
#include <httptrace.h>
#include <httpserv.h>
#include <httpcach.h>

#include <string>
using namespace std;

#import "msxml6.dll"
using namespace MSXML2;

// The CConvert class mirrors the Convert class that is 
// defined in the .NET Framework. It converts primitives 
// and other data types to wstring types.
class CConvert
{
public:
    // The ToString method converts a HANDLE to a wstring.
    // h: the HANDLE to convert to a wstring.
    // return: the HANDLE as a wstring.
    static wstring ToString(HANDLE h)
    {
        // If the HANDLE is NULL, return the "NULL" string.
        if (NULL == h)
        {
            return L"NULL";
        }

        // If the HANDLE is not valid, return 
        // the INVALID_HANDLE_VALUE as a string.
        if (INVALID_HANDLE_VALUE == h)
        {
            return L"INVALID_HANDLE_VALUE";
        }

        // The HANDLE is valid.
        return L"valid";
    }
    
    // The ToString method converts a FILETIME pointer to a wstring.
    // fileTime: the FILETIME pointer to convert to a wstring.
    // return: the FILETIME pointer as a wstring.
    static wstring ToString(FILETIME* fileTime)
    {
        // If fileTime is NULL, return the empty string.
        if (NULL == fileTime)
        {
            return L"NULL";
        }

        // Convert the FILETIME to a local time, and 
        // then convert that local time to a wstring.
        SYSTEMTIME stUTC;
        SYSTEMTIME stLocal;
        FileTimeToSystemTime(fileTime, &stUTC);
        SystemTimeToTzSpecificLocalTime(NULL, &stUTC, &stLocal);        

        // Create a wstring to return.  Note: wsprintf 
        // can be also used. However, it is more difficult 
        // to handle both UNICODE and non-UNICODE correctly.
        wstring timeString =
            ToString(stLocal.wMonth) +
            wstring(L"/")            +
            ToString(stLocal.wDay)   +
            wstring(L"/")            +
            ToString(stLocal.wYear)  +
            wstring(L"  ")           +
            ToString(stLocal.wHour)  +
            wstring(L":")            +
            ToString(stLocal.wMinute);

        // Return the FILETIME data as a wstring.
        return timeString;
    }
    
    // The ToString method converts a 
    // ULARGE_INTEGER pointer to a wstring.
    // ui: the ULARGE_INTEGER pointer to convert to a string.
    // return: the ULARGE_INTEGER pointer as a string.
    static wstring ToString(ULARGE_INTEGER* ui)
    {
        // Return the empty string if the 
        // ULARGE_INTEGER pointer is NULL.
        if (NULL == ui)
        {
            return L"NULL";
        }
        
        // Return the low-order part to a wstring.
        return (ToString(ui->LowPart));
    }
    
    // The ToString method converts a PCSTR to a wstring.
    // pcstr: the PCSTR to convert to a wstring.
    // return: the PCSTR as a wstring.
    static wstring ToString(PCSTR pcstr)
    {
        // Return the empty string 
        // if the PCSTR is NULL.
        if (NULL == pcstr)
        {
            return L"NULL";
        }

        // Get the length of the string to copy.
        size_t length = strlen(pcstr);
        // Create a new double-byte character 
        // array of length plus 1.
        wchar_t* newText = new wchar_t[length+1];

        // Copy the source into the sink string.
        for (size_t i = 0; i < length; ++i)
        {
            newText[i] = pcstr[i];
        }

        // Terminate the string with the NULL character.
        newText[length] = '\0';
        // Get a wstring from the new double-byte string.
        wstring wText = newText;
        // Call delete on the newText pointer 
        // and set this pointer to NULL.
        delete[] newText;
        newText = NULL;

        // Return the wstring copy.
        return wText;
    }
        
    // The ToString method converts a long to a wstring.
    // l: the long value to convert to a wstring.
    // return: the long as a wstring.
    static wstring ToString(long l)
    {
        WCHAR str[256];
        str[0] = '\0';        
        _ltow_s(l, str, 256, 10);
        return str;
    }
        
    // The ToString method converts a DWORD to a wstring.
    // d: the DWORD value to convert to a wstring.
    // return: the DWORD as a wstring.
    static wstring ToString(DWORD d)
    {
        return ToString((long)d);
    }
    
    // The ToString method converts an LPCGUID to a wstring.
    // guid: the LPCGUID value to convert to a wstring.
    // return: The LPCGUID as a wstring; otherwise, L"" if
    // guid is NULL.
    static wstring ToString(LPCGUID guid)
    {
        // If the GUID is NULL, return the empty string.
        if (NULL == guid)
        {
            return L"NULL";
        }

        // Create a WCHAR array to write the GUID to.
        WCHAR guidString[256];
        // Initialize the zero-based index of the 
        // guidString to the null-terminating character 
        // because the StringFromGUID2 may fail.
        guidString[0] = '\0';
        // Convert the GUID to a string of the form "{...}".
        int characters = StringFromGUID2(*guid, guidString, 256);
        // Return the guidString as a wstring.
        return guidString;
    }

    // The ToString method converts a BOOL to a wstring.
    // b: the BOOL value to convert to a wstring.
    // return: L"true" for true; otherwise, L"false" for false.
    static wstring ToString(BOOL b)
    {
        return (b) ? L"true" : L"false";
    }

    // The ToByteString converts a double-byte 
    // character string to a single-byte string.
    // str: the double-byte string to convert.
    // return: a single-byte string copied from str.
    static string ToByteString(const wstring& str)
    {
        // Get the length of the 
        // double-byte string.
        size_t length = str.length();

        // Create a temporary char pointer.
        char* byteChar = new char[length+1];
        byteChar[0] = '\0';
        // Copy the double-byte character string
        // into the single-byte string.        
        size_t charsReturned = 0;
        wcstombs_s(&charsReturned, byteChar, 
                   length+1, str.c_str(), length+1);
        // Create a string to return.
        string retString = byteChar;
        // Delete the temporary string and
        // set that string to NULL.
        delete[] byteChar;
        byteChar = NULL;

        // Return the single-byte string.
        return retString;
    }

    // The ToString method converts a USHORT to a wstring.
    // u: the USHORT value to convert to a wstring.
    // return: the value of u as a wstring.
    static wstring ToString(USHORT u)
    {
        return (ToString((long)u));
    }

    // The ToString method converts a 
    // const BYTE pointer to a wstring.
    // bytes: the BYTE pointer to convert.
    // return: the value of bytes as a wstring.
    static wstring ToString(const BYTE* bytes)
    {
        return (ToString((PCSTR)bytes));    
    }

    // The ToString method converts 
    // a PCWSTR to a wstring.
    // pcwstr: the PCWSTR to convert.
    // return: L"NULL" if the pcwstr
    // parameter is NULL; otherwise, 
    // pcwstr converted to a wstring.
    static wstring ToString(PCWSTR pcwstr)
    {
        // If the pcwstr parameter
        // is NULL, return L"NULL".
        if (NULL == pcwstr)
        {
            return L"NULL";
        }

        // Implicitly convert the 
        // PCWSTR to a wstring.
        return pcwstr;
    }

    // The ToString method converts 
    // a character to a wstring.
    // c: the character to convert.
    // return: c as a wstring.
    static wstring ToString(char c)
    {
        wstring str;
        str += c;
        return str;
    }

    // The ToString method converts
    // a short to a wstring.
    // s: the short to convert.
    // return: s as a wstring.
    static wstring ToString(short s)
    {
        return (ToString((long)s));
    }
};

// The CFilter class accepts all XML documents
// for writing. Classes that inherit from 
// CFilter should override the Accept method.
class CFilter
{
public:
    // Creates the CFilter class.
    CFilter()
    {
    }

    // Creates the Destructor for the 
    // CFilter class.
    virtual ~CFilter()
    {
    }

    // The Accept method returns true if the XML
    // document should be written.
    // doc: the XML document to write.
    // return: true.
    virtual bool Accept(MSXML2::IXMLDOMDocument3Ptr doc) const
    {
        return true;
    }
};

// The CXmlFilter class inherits from the CFilter
// class. CXmlFilter overrides the Accept method,
// and returns true if the XML document contains 
// an element with a given name.
class CXmlFilter : public CFilter
{
public:
    // Creates the CXmlFilter class.
    // element: the name of the XML element
    // that must be in an XML document.
    CXmlFilter(const wstring& element) :
        m_elementName(element)
    {
    }

    // Creates the destructor for 
    // the CXmlFilter class.
    virtual ~CXmlFilter()
    {
    }

    // The Accept method overrides 
    // the CFilter implementation.
    // doc: the XML document for writing.
    // return: true if the XML document contains
    // an element with the name m_elementName.
    virtual bool Accept(MSXML2::IXMLDOMDocument3Ptr doc) const
    {
        // Get a list of the nodes 
        // with the given name.
        MSXML2::IXMLDOMNodeListPtr nodes = 
            doc->getElementsByTagName(m_elementName.c_str());

        // Return true if there are any nodes 
        // in the document with this name.
        return ((nodes->length) > 0);
    }    

private:
    // Specify the name of the
    // element in the XML document.
    wstring m_elementName;
};

// The CEventWriter class writes XML 
// documents and strings to the event log.
class CEventWriter
{
public:
    // Creates the CEventWriter class.
    // name: the name of the 
    // event log to open.
    CEventWriter(const wstring& name)
    {                
        #ifdef UNICODE
        m_eventLog = RegisterEventSource(NULL, name.c_str());
        #else
        string multiName = CConvert::ToByteString(name);
        m_eventLog = RegisterEventSource(NULL, multiName.c_str());
        #endif        
    }

    // Creates the destructor for the 
    // CEventWriter class. This destructor
    // closes the HANDLE to the event 
    // log if that HANDLE is open.
    virtual ~CEventWriter()
    {
        // If the HANDLE to the event 
        // log is open, close it.
        if (NULL != m_eventLog)
        {
            // Deregister the event log HANDLE.
            DeregisterEventSource(m_eventLog);
            // Set the HANDLE to NULL.
            m_eventLog = NULL;
        }
    }
    
    // The ReportInfo method writes the content
    // of the XML document to the event log.
    // doc: the XML document to write.
    // return: true if the event log is written.
    BOOL ReportInfo(MSXML2::IXMLDOMDocument3Ptr doc)
    {
        MSXML2::IXMLDOMElementPtr documentElement = 
            doc->documentElement;
        // Get the XML as a BSTR and place this XML into a 
        // _bstr_t wrapper. The client of the XML document 
        // is responsible for deleting the returned BSTR from 
        // the property, which the _bstr_t wrapper will do
        // automatically.
        _bstr_t bstrXml = documentElement->xml;
        // Convert the _bstr_t to a wstring.
        wstring xmlString = bstrXml;
        // Write the XML to the event writer.
        return ReportInfo(xmlString);        
    }

    // The ReportInfo method writes the content
    // of the XML document to the event log if
    // the filter parameter accepts the document.
    // doc: the XML document to write.
    // filter: the CFilter address for 
    // filtering XML documents.
    // return: true if the event log is written.
    BOOL ReportInfo(MSXML2::IXMLDOMDocument3Ptr doc, const CFilter& filter)
    {
        if (filter.Accept(doc))
        {
            return ReportInfo(doc);
        }

        return FALSE;
    }

    // The ReportInfo method writes 
    // a wstring to the event log.
    // info: the wstring to write.
    // return: true if the event log is written.
    BOOL ReportInfo(const wstring& info)
    {
        return ReportEvent(EVENTLOG_INFORMATION_TYPE, info);
    }

    // The ReportError method writes 
    // a wstring to the event log.
    // error: the wstring to write.
    // return: true if the event log is written.
    BOOL ReportError(const wstring& error)
    {
        return ReportEvent(EVENTLOG_ERROR_TYPE, error);
    }
protected:
    // The ReportEvent method accepts an event type
    // and a wstring, and attempts to write that 
    // event to the event log.
    // type: the type of the event.
    // data: the wstring to write to the event log.
    // return: true if the event log is written;
    // otherwise, false.
    BOOL ReportEvent(WORD type, const wstring& data)
    {
        // If the m_eventLog HANDLE 
        // is NULL, return false.
        if (NULL == m_eventLog)
        {
            return FALSE;
        }

        #ifndef _DEBUG
        // If the current build is not debug,
        // return so the event log is not written.
        return TRUE;
        #endif

        #ifdef UNICODE
        // The unicode version of the ReportEvent
        // method requires double-byte strings.
        PCWSTR arr[1];
        arr[0] = data.c_str();
        return ::ReportEvent(m_eventLog,
                             type,
                             0, 0, NULL, 1, 
                             0, arr, (void*)arr);
        #else
        // The non-unicode version of the ReportEvent
        // method requires single-byte strings.
        string multiByte = 
            CConvert::ToByteString(data);
        LPCSTR arr[1];
        arr[0] = multiByte.c_str();
        return ::ReportEvent(m_eventLog,
                             type,
                             0, 0, NULL, 1,
                             0, arr, (void*)arr);
        #endif
    }
private:
    // Specify the HANDLE to the 
    // event log for writing.
    HANDLE m_eventLog;
};

// The CGlobalCacheModule class creates the CGlobalModule 
// class and registers for GL_CACHE_OPERATION and 
// GL_CACHE_CLEANUP events.
class CGlobalCacheModule : public CGlobalModule
{
public:
    // Creates the destructor for the 
    // CGlobalCacheModule class.
    virtual ~CGlobalCacheModule()
    {

    }

    // The RegisterGlobalModule method creates and registers 
    // a new CGlobalCacheModule for GL_CACHE_OPERATION and 
    // GL_CACHE_CLEANUP events.
    // dwServerVersion: the current server version.
    // pModuleInfo: the current IHttpModuleRegistrationInfo pointer.
    // pGlobalInfo: the current IHttpServer pointer.
    // return: ERROR_NOT_ENOUGH_MEMORY if the heap is out of 
    // memory; otherwise, the value from the call to the 
    // SetGlobalNotifications method on the pModuleInfo pointer.
    static HRESULT RegisterGlobalModule
    (
        DWORD dwServerVersion,
        IHttpModuleRegistrationInfo* pModuleInfo,
        IHttpServer* pGlobalInfo
    )
    {        
        // The pGlobalInfo parmeter must be non-NULL because
        // the constructor for the CGlobalCacheModule class
        // requires a non-NULL pointer to a valid IHttpServer 
        // pointer.
        if (NULL == pGlobalInfo)
        {
            return E_INVALIDARG;
        }

        // Create a new CGlobalCacheModule pointer.
        CGlobalCacheModule* traceModule = 
            new CGlobalCacheModule();

        // Return an out-of-memory error if the traceModule 
        // is NULL after the call to the new operator.
        if (NULL == traceModule)
        {            
            return HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
        }        

        // Attempt to set global notification for both 
        // GL_CACHE_OPERATION and GL_CACHE_CLEANUP events 
        // by using the traceModule as a listener.
        HRESULT hr = pModuleInfo->SetGlobalNotifications
            (traceModule, GL_CACHE_OPERATION | GL_CACHE_CLEANUP);
                        
        // If the SetGlobalNotifications method 
        // fails, return the HRESULT.
        if (FAILED(hr))
        {
            return hr;
        }

        // Set the priority to PRIORITY_ALIAS_FIRST, 
        // which will populate the data as much as possible.
        hr = pModuleInfo->SetPriorityForGlobalNotification(
            GL_CACHE_OPERATION, PRIORITY_ALIAS_FIRST);

        // Return the HRESULT from the call to 
        // the SetGlobalNotifications method.
        return hr;
    }

    // The OnGlobalCacheOperation method is called 
    // when GL_CACHE_OPERATION operations occur.
    // pProvider: the current ICacheProvider pointer.
    // return: GL_NOTIFICATION_CONTINUE.
    virtual GLOBAL_NOTIFICATION_STATUS OnGlobalCacheOperation
    (
        IN ICacheProvider* pProvider
    )
    {
        // The OnGlobalCacheOperation must return if the 
        // pProvider parameter is NULL because this pointer 
        // is needed for data to write to the event log.
        if (NULL == pProvider)
        {
            return GL_NOTIFICATION_CONTINUE;
        }

        // The following code uses COM smart pointers. Wrap 
        // the code in one try/catch statement for _com_error
        // exceptions. Note: it is not necessary to call 
        // CoInitialize and CoUninitialize on this thread 
        // because IIS does this automatically.
        try
        {
            // Create an XML document in memory.
            MSXML2::IXMLDOMDocument3Ptr doc(__uuidof(MSXML2::DOMDocument60));

            // Create a cacheProvider root element and 
            // append this root element to the XML document.
            MSXML2::IXMLDOMElementPtr cacheProviderElement =
                doc->createElement(L"cacheProvider");
            doc->appendChild(cacheProviderElement);

            // Get the IHttpCacheKey pointer from the ICacheProvider 
            // pointer.
            IHttpCacheKey* cacheKey = pProvider->GetCacheKey();

            // Create an element for the cache key and add 
            // that element to the cacheProviderElement.
            MSXML2::IXMLDOMElementPtr cacheKeyElement =
                CreateElement(cacheKey, doc);
            cacheProviderElement->appendChild(cacheKeyElement);

            // Create a filter.
            CXmlFilter filter(L"fileKey");
            // Write the XML using the writer.    
            m_eventWriter.ReportInfo(doc, filter);
        }
        // Catch any _com_error that occurs while you are 
        // writing to the XML document in memory.
        catch (_com_error& ce)
        {            
            // Get the description for the error.
            wstring description = ce.Description();
            // Write the error to the event writer.
            m_eventWriter.ReportError(description);
        }

        // Return GL_NOTIFICATION_CONTINUE so that 
        // other listeners will receive the event.
        return GL_NOTIFICATION_CONTINUE;
    }

    // The OnGlobalCacheCleanup method is called when 
    // GL_CACHE_CLEANUP events occur.
    // return: GL_NOTIFICATION_CONTINUE.
    virtual GLOBAL_NOTIFICATION_STATUS OnGlobalCacheCleanup(VOID)
    {
        // Return GL_NOTIFICATION_CONTINUE so that 
        // other listeners will receive this event.
        return GL_NOTIFICATION_CONTINUE;
    }

    // PRE: none.
    // POST: the Terminate method calls delete on this,
    // which releases the memory for the current 
    // CGlobalCacheModule pointer on the heap.
    virtual VOID Terminate(VOID)
    {
        delete this;
    }
protected:
    // Creates the constructor for 
    // the CGlobalCacheModule class.
    CGlobalCacheModule() : m_eventWriter(L"IISADMIN")
    {

    }

    // The AddAttribute creates a new attribute using 
    // the doc value, sets the new attribute's name and 
    // text, adds the new attribute to the element value 
    // and, finally, returns the attribute.
    // PRE: neither the element nor the doc 
    // parameters are NULL.
    // name: the name of the attribute.
    // text: the text of the attribute.
    // element: the element to add the new attribute to.
    // doc: the XML document for creating a new attribute.
    // return: the new IXMLDOMAttributePtr 
    // that is added to the element.
    // throws: a _com_error exception.
    static MSXML2::IXMLDOMAttributePtr AddAttribute
    (
        const wstring& name,
        const wstring& text,
        MSXML2::IXMLDOMElementPtr element,
        MSXML2::IXMLDOMDocument3Ptr doc
    ) throw (_com_error)
    {
        // Create an attribute with the name.
        MSXML2::IXMLDOMAttributePtr attribute = 
            doc->createAttribute(name.c_str());
        // Set the text of the attribute to the text value.
        attribute->text = text.c_str();
        // Add the attribute to the passed element.
        element->setAttributeNode(attribute);
        // Return the new attribute to the caller.
        return attribute;
    }

    // The CreateElement method converts an IFileKey pointer
    // and its decsendant data to an XML element.
    // PRE: the doc parameter must not be NULL.
    // POST: none.
    // fileKey: the IFileKey pointer to convert to an XML element.
    // return: a new MSXML2::IXMLDOMElementPtr representing 
    // the data in the fileKey parameter and its descendants.
    // throws: a _com_error exception.
    static MSXML2::IXMLDOMElementPtr CreateElement
    (
        IFileKey* fileKey,
        MSXML2::IXMLDOMDocument3Ptr doc
    ) throw (_com_error)
    {
        // Create a new element to return.
        MSXML2::IXMLDOMElementPtr fileKeyElement =
            doc->createElement(L"fileKey");

        // If the fileKey is empty return the fileKeyElement.
        if (NULL == fileKey)
        {
            return fileKeyElement;
        }

        // Get the path from the 
        // IFileKey pointer.
        wstring path = fileKey->GetPath();
        
        // Add a path attribute to the 
        // fileKeyElement.
        AddAttribute(L"path", path, fileKeyElement, doc);

        // Return the fileKeyElement to the caller.
        return fileKeyElement;
    }

    // The CreateElement method converts an IHttpCacheKey 
    // pointer and its descendant data into an XML element.
    // PRE: the doc parameter must not be NULL.    
    // cacheKey: the IHttpCacheKey pointer 
    // to convert to an XML element.
    // return: a new MSXML2::IXMLDOMElementPtr representing 
    // the data in the cacheKey parameter and its descendants.
    // throws: a _com_error exception.
    static MSXML2::IXMLDOMElementPtr CreateElement
    (
        IHttpCacheKey* cacheKey,
        MSXML2::IXMLDOMDocument3Ptr doc
    ) throw (_com_error)
    {
        // Create a default cache key element to return.
        MSXML2::IXMLDOMElementPtr cacheKeyElement =
            doc->createElement(L"cacheKey");

        // If the cacheKey parameter is NULL 
        // return the empty cacheKeyElement.
        if (NULL == cacheKey)
        {            
            return cacheKeyElement;
        }

        // Get the cache name of the key. The name of this 
        // cache key indicates what interface extension to which
        // the IHttpCacheKey pointer can be safely downcast.
        wstring cacheName = cacheKey->GetCacheName();

        // If the cacheName is FILE_CACHE_NAME, it is safe to
        // downcast the cacheKey to an IFileKey pointer.
        if (FILE_CACHE_NAME == cacheName)
        {
            // Downcast the cacheKey to an IFileKey 
            // pointer for additional functionality.            
            IFileKey* fileKey =
                dynamic_cast<IFileKey*>(cacheKey);
            // Reset the cacheKeyElement to the new element.
            cacheKeyElement = CreateElement(fileKey, doc);
        }

        // Add an attribute to the cacheKeyElement 
        // for cache name information.
        AddAttribute(L"cacheName", cacheName, 
                     cacheKeyElement, doc);

        // Get the hash from the 
        // IHttpCacheKey pointer.
        DWORD hashDWORD = cacheKey->GetHash();
        // Convert the DWORD to a wstring.
        wstring hash = CConvert::ToString(hashDWORD);

        // Add an attribute to the 
        // cacheKeyElement for hash information.
        AddAttribute(L"hash", hash, 
                     cacheKeyElement, doc);

        // Get IsEqual information from the 
        // IHttpCacheKey pointer by comparing 
        // the current pointer.
        BOOL isEqualBOOL = 
            cacheKey->GetIsEqual(cacheKey);
        // Convert the Boolean to a wstring.
        wstring isEqual = CConvert::ToString(isEqualBOOL);

        // Add an attribute to the cacheKeyElement 
        // for equal information against itself.
        AddAttribute(L"isEqual", isEqual,                      
                     cacheKeyElement, doc);

        // Get GetIsPrefix information from 
        // the IHttpCacheKey pointer by comparing
        // the current pointer.
        BOOL isPrefixBOOL = 
            cacheKey->GetIsPrefix(cacheKey);
        // Convert the Boolean to a wstring.
        wstring isPrefix = CConvert::ToString(isPrefixBOOL);

        // Add an isPrefix attribute to
        // the cacheKeyElement.
        AddAttribute(L"isPrefix", isPrefix,                      
                     cacheKeyElement, doc);

        // Return the new cacheKeyElement to the caller.
        return cacheKeyElement;
    }
private:
    // Specify the event writer.
    CEventWriter m_eventWriter;
};

// The RegisterModule method is the 
// main entry point for the DLL.
// dwServerVersion: the current server version.
// pModuleInfo: the current 
// IHttpModuleRegistrationInfo pointer.
// pGlobalInfo: the current IHttpServer pointer.
// return: the value returned by calling the
// CGlobalCacheModule::RegisterGlobalModule
// method.
HRESULT
__stdcall
RegisterModule(
    DWORD dwServerVersion,
    IHttpModuleRegistrationInfo* pModuleInfo,
    IHttpServer* pGlobalInfo
)
{        
    // Call the static method for initialization.
    return CGlobalCacheModule::RegisterGlobalModule            
        (dwServerVersion, 
         pModuleInfo, 
         pGlobalInfo);             
}

上述程式碼會將新的事件寫入事件檢視器，其中 [資料] 方塊包含類似下列的 XML。

<cacheProvider>  
    <fileKey   
        path="C:\INETPUB\WWWROOT\DEFAULT.HTM"   
        cacheName="FILE"   
        hash="123456789"   
        isEqual="true"   
        isPrefix="true"/>  
</cacheProvider>  

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。

繼承階層架構

IHttpCacheKey

IFileKey

規格需求

另請參閱

Web Server Core 介面