IHttpTraceContext::QuickTrace Method

Writes a message to the IIS trace log.

Syntax

virtual  
    HRESULT  
    QuickTrace(  
        IN PCWSTR   pszData1,  
        IN PCWSTR   pszData2 = NULL,  
        IN HRESULT  hrLastError = S_OK,  
        IN UCHAR    Level = 4  
    ) = 0;  

Parameters

Return Value

An HRESULT. Possible values include, but are not limited to, those in the following table.

Remarks

Event trace levels 1 through 5 correspond to Event Tracing for Windows (ETW) trace levels. For more information about these trace levels, see the EVENT_TRACE_HEADER structure. You can also use trace level 6 (defined as HTTP_TRACE_LEVEL_START in the Httptrace.h header file) and trace level 7 (defined as HTTP_TRACE_LEVEL_END in Httptrace.h).

Example

The following example demonstrates how to use the IHttpRequest::SetUrl method to change a requested URL to another URL and log the change with the QuickTrace method.

You must enable Failed Event Request tracing to see the event.

HRESULT GLOBAL_MODULE::Initialize( VOID  ){
    return S_OK;
}

// CGlobalModule derived classes must implement Terminate
// And free memory
//
VOID GLOBAL_MODULE::Terminate( VOID){
    delete this;
}


GLOBAL_NOTIFICATION_STATUS
GLOBAL_MODULE::OnGlobalPreBeginRequest(
                                       IPreBeginRequestProvider* pProvider
                                       )
{
    HRESULT         hr          = S_OK;
    IHttpContext*   pContext    = pProvider->GetHttpContext( );
    IHttpRequest*   pRequest    = pContext->GetRequest( );
    IHttpResponse*  pResponse   = pContext->GetResponse( );

    PCWSTR rqUrl = pContext->GetRequest()->GetRawHttpRequest()->CookedUrl.pAbsPath;
    OutputDebugStringW(rqUrl);

    //
    // Change only specific URL requests. 
    //

    wchar_t URLask[]     = L"/rPost.htm";
    wchar_t URLreset[]   = L"/Test.htm";
    if(!wcscmp(rqUrl,URLask)){
        hr = pRequest->SetUrl( URLreset, sizeof( URLreset )/sizeof(URLreset[0]) - 1, TRUE );
        pContext->GetTraceContext( )->QuickTrace( L"URL change from rPost to", URLreset );
    }
    if( FAILED( hr ) )
        goto Finished;


Finished:

    if( FAILED( hr ) ){
        pResponse->SetStatus( 500, "Internal Server Error", 0, hr );
        return GL_NOTIFICATION_HANDLED;
    }

    return GL_NOTIFICATION_CONTINUE;
}

/*
#include "stdafx.h"

HRESULT GLOBAL_MODULE::Initialize( VOID  ){
    return S_OK;
}

// CGlobalModule derrived classes must implement Terminate
// And free memory
//
VOID GLOBAL_MODULE::Terminate( VOID){
    delete this;
}


GLOBAL_NOTIFICATION_STATUS
GLOBAL_MODULE::OnGlobalPreBeginRequest(
                                       IPreBeginRequestProvider* pProvider
                                       )
{
    HRESULT         hr          = S_OK;
    IHttpContext*   pContext    = pProvider->GetHttpContext( );
    IHttpRequest*   pRequest    = pContext->GetRequest( );
    IHttpResponse*  pResponse   = pContext->GetResponse( );

    PCWSTR rqUrl = pContext->GetRequest()->GetRawHttpRequest()->CookedUrl.pAbsPath;
    OutputDebugStringW(rqUrl);

    //
    // Change only specific URL requests.
    //

    wchar_t URLask[]     = L"/rPost.htm";
    wchar_t URLreset[]   = L"/Test.htm";
    if(!wcscmp(rqUrl,URLask)){
        hr = pRequest->SetUrl( URLreset, sizeof( URLreset )/sizeof(URLreset[0]) - 1, TRUE );
        pContext->GetTraceContext( )->QuickTrace( L"URL change to test " );
    }
    if( FAILED( hr ) )
        goto Finished;


Finished:

    if( FAILED( hr ) ){
        pResponse->SetStatus( 500, "Internal Server Error", 0, hr );
        // returning GL_NOTIFICATION_HANDLED means end the request
        return GL_NOTIFICATION_HANDLED;
    }

    return GL_NOTIFICATION_CONTINUE;
}
*/

int _tmain(int argc, _TCHAR* argv[])
{
    printf("It works!");
    return 0;
}

#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 );

        // Retrieve a pointer to the request.
        IHttpRequest * pHttpRequest = pHttpContext->GetRequest();

        // Test for an error.
        if (pHttpRequest != NULL)
        {
            // Specify an OPTIONS request method.
            HRESULT hr = pHttpRequest->SetHttpMethod("OPTIONS");
            // Test for an error.
            if (FAILED(hr))
            {
                // Set the error status.
                pProvider->SetErrorStatus( hr );
                // End additional processing.
                return RQ_NOTIFICATION_FINISH_REQUEST;
            }
        }

        // Return processing to the pipeline.
        return RQ_NOTIFICATION_CONTINUE;
    }
};

// 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 );

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

Requirements