windows-server-2003/drivers/storage/wmiprov/inc/vs_debug.hxx

/*++

Copyright (c) 1999  Microsoft Corporation

Module Name:

    vs_debug.hxx

Abstract:

    Various defines for general usage

Author:

    Adi Oltean  [aoltean]  07/09/1999

Revision History:

    Name        Date        Comments
    aoltean     07/09/1999  Created
    aoltean     08/11/1999  Adding throw specification
    aoltean     09/03/1999  Adding DuplicateXXX functions
    aoltean     09/09/1999  dss -> vss
    aoltean     09/20/1999  Adding ThrowIf, Err, Msg, MsgNoCR, etc.

--*/

#ifndef __VSS_DEBUG_HXX__
#define __VSS_DEBUG_HXX__

#if _MSC_VER > 1000
#pragma once
#endif

////////////////////////////////////////////////////////////////////////
//  Standard foo for file name aliasing.  This code block must be after
//  all includes of VSS header files.
//
#ifdef VSS_FILE_ALIAS
#undef VSS_FILE_ALIAS
#endif
#define VSS_FILE_ALIAS "INCDEBGH"
//
////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////
//  Global constants
//

//  @const x_nVssMsgBufferSize | Maximum buffer size in Tracer operations
const x_nVssMsgBufferSize       = 512;
const x_nVssNumericBufferSize   = 30;
const x_nVssGuidBufferSize      = 60;
const x_nVssMaxDebugArgs        = 10;
const WCHAR x_wszEventLogVssSourceName[] = L"VSS";


/////////////////////////////////////////////////////////////////////////////
//  Declared classes
//


//
//  @class CVssFunctionTracer | This structure is used for tracing, debugging, treating HRESULTS
//  in a C++ function, especially a COM server method.
//

struct CVssDebugInfo
{

// Constructors& destructors
private:
    CVssDebugInfo();

public:
    CVssDebugInfo(
        LPCWSTR wszFile,
        LPCSTR szFileAlias,  //  Five character alias, see file drivers\volsnap\filealias.xls for mappings
        ULONG ulLine,
        DWORD dwLevel,
        DWORD dwIndent = 0
        );

    CVssDebugInfo(
        const CVssDebugInfo& original
        );

    ~CVssDebugInfo() ;

// Operations
public:

    // This is used to add an numeric-type argument
    CVssDebugInfo operator << ( IN INT nArgument );

    // This is used to add an numeric-type argument.
    // It will be represented in hexadecimal format.
    CVssDebugInfo operator << ( IN HRESULT hrArgument );

    // This is used to add an numeric-type argument.
    // It will be represented in hexadecimal format.
    CVssDebugInfo operator << ( IN LONGLONG llArgument );

    // This is used to add an numeric-type argument.
    CVssDebugInfo operator << ( IN GUID hrArgument );

    // This is used to add an string-type argument
    CVssDebugInfo operator << ( IN LPCWSTR wszArgument );

public:
    LPCWSTR         m_wszFile;
    LPCSTR          m_szFileAlias;
    ULONG           m_ulLine;
    DWORD           m_dwLevel;
    DWORD           m_dwIndent;

    // Optional argument list
    LPWSTR          m_ppwszStrings[x_nVssMaxDebugArgs];
    WORD            m_wNumStrings;
    bool            m_bOutOfMemoryOccured;
    mutable bool    m_bStringsOwnership;
};


#define VSSDBG_COORD   CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_COORD, 0)
#define VSSDBG_SWPRV   CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_SWPRV, 0)
#define VSSDBG_TESTPRV CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_TESTPRV, 0)
#define VSSDBG_VSSTEST CVssDebugInfo(__WFILE__, "TST--", __LINE__, DEBUG_TRACE_VSS_TEST, 0)
#define VSSDBG_VSSDEMO CVssDebugInfo(__WFILE__, "TSD--", __LINE__, DEBUG_TRACE_VSS_DEMO, 0)
#define VSSDBG_EXCEPT  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_CATCH_EXCEPTIONS, 0)
#define VSSDBG_GEN     CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_GEN, 0)
#define VSSDBG_XML     CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_XML, 0)
#define VSSDBG_WRITER  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_WRITER, 0)
#define VSSDBG_IOCTL   CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_IOCTL, 0)
#define VSSDBG_SHIM    CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_SHIM, 0)
#define VSSDBG_SQLLIB  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_SQLLIB, 0)
#define VSSDBG_VSSADMIN  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_VSS_ADMIN, 0)
#define VSSDBG_STSWRITER  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_STSWRITER, 0)
#define VSSDBG_SQLWRITER  CVssDebugInfo(__WFILE__, VSS_FILE_ALIAS, __LINE__, DEBUG_TRACE_SQLWRITER, 0)

#define VSS_STANDARD_CATCH(FT)                                                              \
    catch( HRESULT CaughtHr ) {                                                             \
        FT.hr = CaughtHr;                                                                   \
        FT.Trace( VSSDBG_EXCEPT, L"HRESULT EXCEPTION CAUGHT: hr: 0x%x", FT.hr );            \
    }                                                                                       \
    catch( ... ) {                                                                          \
        FT.hr = E_UNEXPECTED;                                                               \
        FT.Trace( VSSDBG_EXCEPT, L"UNKNOWN EXCEPTION CAUGHT, returning hr: 0x%x", FT.hr );  \
    }

//
//  @class CVssFunctionTracer | This class is used for tracing, debugging, treating HRESULTS
//  in a C++ function, especially a COM server method.
//
class CVssFunctionTracer
{
    class CVssOutputBuffer
    {
    private:
        // Must be under 512 in order to make
        // the lookaside allocation algortihm work efficiently!
        enum { nVssMsgBufferSize = 400 };
        WCHAR* m_pwszBuffer;

    public:
        CVssOutputBuffer() { m_pwszBuffer = new WCHAR[nVssMsgBufferSize + 1]; }
        ~CVssOutputBuffer() { delete m_pwszBuffer; }

        INT GetBufferSize() { return nVssMsgBufferSize; };
        WCHAR * GetBuffer() { return m_pwszBuffer; };
        bool IsBufferValid() { return (m_pwszBuffer != NULL); };
    };


// Constructors and destructors
private:
    CVssFunctionTracer();
    CVssFunctionTracer(const CVssFunctionTracer&);

public:
    CVssFunctionTracer(
        IN  CVssDebugInfo dbgInfo,
        IN  const WCHAR* pwszFunctionName
        );

    ~CVssFunctionTracer();

// Attributes
public:
    _declspec(property(get=GetHr,put=SetHr))  HRESULT hr;

    // Implementation
    inline HRESULT GetHr() { return m_hr; };
    inline void SetHr( HRESULT hr ) { m_hr = hr; };

    inline bool HrFailed() { return FAILED(m_hr); };
    inline bool HrSucceeded() { return SUCCEEDED(m_hr); };

// Operations
public:

    //
    //  Traces.
    //

    void inline __cdecl Trace( CVssDebugInfo dbgInfo, const WCHAR* pwszMsgFormat, ...);

    void inline TraceBuffer( CVssDebugInfo dbgInfo, DWORD dwBufferSize, PBYTE pbBuffer );

    void inline __cdecl Throw(
        CVssDebugInfo dbgInfo,          // Caller debugging info
        HRESULT hrToBeThrown,           // The new HR to be thrown
        const WCHAR* pwszMsgFormat,     // Message that will be displayed if throw needed
        ...                             // Additional arguments
        ) throw(HRESULT);

    void inline __cdecl ThrowIf(
        BOOL bThrowNeeded,              // Throw an HR if and only if bThrowNeeded is TRUE.
        CVssDebugInfo dbgInfo,          // Caller debugging info
        HRESULT hrToBeThrown,           // The new HR to be thrown
        const WCHAR* pwszMsgFormat,     // Message that will be displayed if throw needed
        ...                             // Additional arguments
        ) throw(HRESULT);

    //
    //  Messages displayed at the console (only for test and demo purpose).
    //

    void __cdecl Msg(
            const WCHAR* pwszMsgFormat,     // Message that will be displayed
            ...
            );

    void __cdecl MsgNoCR(
            const WCHAR* pwszMsgFormat,     // Message that will be displayed
            ...
            );

    void __cdecl Err(
            CVssDebugInfo dbgInfo,          // Caller debugging info
            HRESULT hrToBeThrown,           // The new HR to be thrown
            const WCHAR* pwszMsgFormat,     // Error message that will be displayed
            ...
            );
    //
    //  Informative message boxes (only for test and demo purpose).
    //

    void __cdecl MsgBox(
            const WCHAR* pwszMsgTitle,      // Title of the Message box
            const WCHAR* pwszMsgFormat,     // Message that will be displayed
            ...
            );

    void __cdecl ErrBox(
            CVssDebugInfo dbgInfo,          // Caller debugging info
            HRESULT hrToBeThrown,           // The new HR to be thrown
            const WCHAR* pwszMsgFormat,     // Error message that will be displayed
            ...
            );

    // Trace the corresponding COM error
    void TraceComError();

    // Log the attempt of starting VSS
    void LogVssStartupAttempt();

    // Put a new entry in the Error Log.
    void __cdecl LogError(
            IN  DWORD dwEventID,                    // The ID of the event
            IN  CVssDebugInfo dbgInfo,              // Caller debugging info
            IN  WORD wType = EVENTLOG_ERROR_TYPE    // Entry type
            );

    void __cdecl TranslateError(
            IN  CVssDebugInfo dbgInfo,
            IN  HRESULT hr,
            IN LPCWSTR wszRoutine
            );


    void inline __cdecl CheckForError(
            IN CVssDebugInfo dbgInfo,
            IN LPCWSTR wszRoutine
            )
            {
            if (HrFailed())
                TranslateError(dbgInfo, m_hr, wszRoutine);
            }

    // check for an error on an internal call.  Do not log E_UNEXPECTED
    // errors
    void inline __cdecl CheckForErrorInternal(
            IN CVssDebugInfo dbgInfo,
            IN LPCWSTR wszRoutine
            )
            {
            if (HrFailed())
                {
                if (m_hr == E_UNEXPECTED)
                    throw E_UNEXPECTED;
                else
                    TranslateError(dbgInfo, m_hr, wszRoutine);
                }
            }


    void __cdecl TranslateGenericError
            (
            IN CVssDebugInfo dbgInfo,          // Caller debugging info
            IN HRESULT hr,
            IN LPCWSTR wszErrorTextFormat,
            IN ...
            );


    void __cdecl LogGenericWarning
            (
            IN CVssDebugInfo dbgInfo,          // Caller debugging info
            IN LPCWSTR wszErrorTextFormat,
            IN ...
            );

    BOOL IsDuringSetup() { return g_cDbgTrace.IsDuringSetup(); };

    BOOL IsInSoftwareProvider() { return m_dwLevel == DEBUG_TRACE_VSS_SWPRV; };

    //
    //  Calls CoCreate in a cycle and performs special logging
    //

    void CoCreateInstanceWithLog(
            IN  CVssDebugInfo   dbgInfo,          // Caller debugging info
            IN  CLSID           ServerClassID,
            IN  LPCWSTR         ServerName,
            IN  DWORD           dwContext,
            IN  IID             InterfaceID,
            OUT IUnknown **     ppUnknown
            );

// Attributes
public:
    HRESULT     m_hr;

// Internal Data
private:
    const WCHAR*      m_pwszFunctionName;
    LPCSTR      m_szFileAlias;
    ULONG       m_ulLine;
    DWORD       m_dwLevel;  // At entry time
    DWORD       m_dwIndent; // At entry time
};



///////////////////////////////////////////////////////////////////////////////////////
// Class implementations
//



///////////////////////////////////////////////////////////////////////////////////////
// CVssDebugInfo


inline CVssDebugInfo::CVssDebugInfo(
    LPCWSTR wszFile,
    LPCSTR szFileAlias,
    ULONG ulLine,
    DWORD dwLevel,
    DWORD dwIndent
    ):
    m_wszFile(wszFile),
    m_szFileAlias(szFileAlias),
    m_ulLine(ulLine),
    m_dwIndent(dwIndent),
    m_dwLevel(dwLevel),
    m_wNumStrings(0),
    m_bOutOfMemoryOccured(false),
    m_bStringsOwnership(true)
{
    for (WORD wIndex = 0; wIndex < x_nVssMaxDebugArgs; wIndex++)
        m_ppwszStrings[wIndex] = NULL;
}


inline CVssDebugInfo::CVssDebugInfo(
    const CVssDebugInfo& original
    )
{
    m_wszFile = original.m_wszFile; // We suppose that this is a constant string.
    m_szFileAlias = original.m_szFileAlias; // We suppose that this is a constant string.
    m_ulLine = original.m_ulLine;
    m_dwIndent = original.m_dwIndent;
    m_dwLevel = original.m_dwLevel;
    m_wNumStrings = original.m_wNumStrings;
    m_bOutOfMemoryOccured = original.m_bOutOfMemoryOccured;

    // Transfer the strings ownership.
    // This will work even if the ownership is already transferred
    m_bStringsOwnership = original.m_bStringsOwnership;
    original.m_bStringsOwnership = false;

    // Transfer the strings
    for (WORD wIndex = 0; wIndex < x_nVssMaxDebugArgs; wIndex++)
        m_ppwszStrings[wIndex] = original.m_ppwszStrings[wIndex];
}



inline CVssDebugInfo::~CVssDebugInfo()
{
    if (m_bStringsOwnership) {
        for (WORD wIndex = 0; wIndex < x_nVssMaxDebugArgs; wIndex++) {
            if ( m_ppwszStrings[wIndex] != NULL ) {
                ::CoTaskMemFree(m_ppwszStrings[wIndex]);
                m_ppwszStrings[wIndex] = NULL;
            }
        }
    }
}


// This is used to add an numeric-type argument
inline CVssDebugInfo CVssDebugInfo::operator << ( IN INT nArgument )
{
    // Converting the number into a string
    WCHAR wszBuffer[x_nVssNumericBufferSize + 1];
    ::_snwprintf(wszBuffer, x_nVssNumericBufferSize, L"%d", nArgument);

    return (*this) << wszBuffer;
}


// This is used to add an HRESULT-type argument
inline CVssDebugInfo CVssDebugInfo::operator << ( IN HRESULT hrArgument )
{
    // Converting the number into a string
    WCHAR wszBuffer[x_nVssNumericBufferSize + 1];
    ::_snwprintf(wszBuffer, x_nVssNumericBufferSize, L"0x%08lx", hrArgument);

    return (*this) << wszBuffer;
}


// This is used to add an LONGLONG-type argument
inline CVssDebugInfo CVssDebugInfo::operator << ( IN LONGLONG llArgument )
{
    // Converting the number into a string
    WCHAR wszBuffer[x_nVssNumericBufferSize + 1];
    ::_snwprintf(wszBuffer, x_nVssNumericBufferSize,
        WSTR_LONGLONG_FMT, LONGLONG_PRINTF_ARG(llArgument) );

    return (*this) << wszBuffer;
}


// This is used to add an GUID-type argument
inline CVssDebugInfo CVssDebugInfo::operator << ( IN GUID guidArgument )
{
    // Converting the number into a string
    WCHAR wszBuffer[x_nVssGuidBufferSize + 1];
    ::_snwprintf(wszBuffer, x_nVssGuidBufferSize, WSTR_GUID_FMT, GUID_PRINTF_ARG(guidArgument));

    return (*this) << wszBuffer;
}


// This is used to add an string-type argument
inline CVssDebugInfo CVssDebugInfo::operator << ( IN LPCWSTR wszArgument )
{
    if (wszArgument == NULL) {
        BS_ASSERT(false);
        return (*this);
    }

    if (m_bOutOfMemoryOccured)
        return (*this);

    // We cannot add more strings if we do not have the ownership...
    if (!m_bStringsOwnership) {
        BS_ASSERT(false);
        return (*this);
    }

    if (m_wNumStrings >= x_nVssMaxDebugArgs) {
        BS_ASSERT(false); // Improper usage (putting too many arguments)
        return (*this);
    }

    // Storing into the actual list of arguments. We might have an allocation error here.
    LPWSTR wszFormattedValue = (LPWSTR)::CoTaskMemAlloc(sizeof(WCHAR)*(1 + ::wcslen(wszArgument)));
    if (wszFormattedValue == NULL) {
        m_bOutOfMemoryOccured = true;
        return (*this);
    }

    ::wcscpy(wszFormattedValue, wszArgument);
    m_ppwszStrings[m_wNumStrings++] = wszFormattedValue;

    return (*this);
}


///////////////////////////////////////////////////////////////////////////////////////
// CVssFunctionTracer


inline CVssFunctionTracer::CVssFunctionTracer(
    IN  CVssDebugInfo dbgInfo,
    IN  const WCHAR* pwszFunctionName
    )
{
    m_hr = S_OK;
    m_pwszFunctionName = pwszFunctionName;
    m_szFileAlias = dbgInfo.m_szFileAlias;
    m_ulLine      = dbgInfo.m_ulLine;
    m_dwLevel     = dbgInfo.m_dwLevel;
    m_dwIndent    = dbgInfo.m_dwIndent;

    if ( g_cDbgTrace.IsTracingEnabled() && g_cDbgTrace.GetTraceEnterExit() )
    {
        g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            m_dwIndent, m_dwLevel, m_pwszFunctionName, TRUE );
        // The reason that I not allow putting here custom-defined arguments is that
        // if the caller put wrong references it can easily generate an AV.
        //  And, at this point, there is no NT exceptions treatment at the caller side.
        g_cDbgTrace.PrintEnterExit(L"");
        g_cDbgTrace.PostPrint( m_dwIndent );
    }
}


inline CVssFunctionTracer::~CVssFunctionTracer()
{
    if ( g_cDbgTrace.IsTracingEnabled() && g_cDbgTrace.GetTraceEnterExit() )
    {
        g_cDbgTrace.PrePrint( L"", 0UL, m_dwIndent, m_dwLevel, m_pwszFunctionName, FALSE );
        g_cDbgTrace.PrintEnterExit(L"hr: 0x%08x", m_hr);
        g_cDbgTrace.PostPrint( m_dwIndent );
    }
}


void inline __cdecl CVssFunctionTracer::Trace( CVssDebugInfo dbgInfo, const WCHAR* pwszMsgFormat, ...)

// WARNING: This function do NOT clear the ft.hr field!

{
    if ( !g_cDbgTrace.IsTracingEnabled() )
        return;

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
        g_cDbgTrace.Print( L"%s: %s", m_pwszFunctionName, buffer.GetBuffer() );
        g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
    }
};

void inline CVssFunctionTracer::TraceBuffer( CVssDebugInfo dbgInfo, DWORD dwBufferSize, PBYTE pbBuffer )
{
    // WARNING: This function do NOT clear the ft.hr field!

    if ( !g_cDbgTrace.IsTracingEnabled() )
        return;

    const nBytesPerSubgroup = 4;
    const nSubgroupsPerGroup = 2;
    const nGroupsCount = 2;
    const nSubgroupSize = 3*nBytesPerSubgroup + 1; // Add a space between subgroups
    const nGroupSize = nSubgroupSize*nSubgroupsPerGroup + 1; // Add a space between groups
    const nLineSize = nGroupSize*nGroupsCount + 1; // Add the zero character.
    WCHAR wszPrintedBufferLine[nLineSize];
    WCHAR wszPrintedBufferLineInChr[nLineSize];
    WCHAR wszDigits[] = L"0123456789ABCDEF";

    // Print each line
    for (DWORD dwBufferOffset = 0; dwBufferOffset < dwBufferSize; )
    {
        int nLineOffset = 0;
        int nLineOffsetChr = 0;

        // Print each group in the line
        for (int nGroupIndex = 0; nGroupIndex < nGroupsCount; nGroupIndex++)
        {
            // Print each subgroup in the group
            for (int nSubgroupIndex = 0; nSubgroupIndex < nSubgroupsPerGroup; nSubgroupIndex++)
            {
                // Print each byte in the subgroup
                for (int nByteIndex = 0; nByteIndex < nBytesPerSubgroup; nByteIndex++)
                {
                    if (dwBufferOffset < dwBufferSize)
                    {
                        BYTE bChar = pbBuffer[dwBufferOffset];
                        wszPrintedBufferLineInChr[nLineOffsetChr++] =
                            ( bChar >= 0x20 && bChar < 0x7F )? (WCHAR)bChar: L'.';
                        wszPrintedBufferLine[nLineOffset++] = wszDigits[pbBuffer[dwBufferOffset] / 0x10];
                        wszPrintedBufferLine[nLineOffset++] = wszDigits[pbBuffer[dwBufferOffset++] % 0x10];
                        wszPrintedBufferLine[nLineOffset++] = L' '; // Print an additional space after each group
                    }
                    else
                    {
                        wszPrintedBufferLineInChr[nLineOffsetChr++] = L'#';
                        wszPrintedBufferLine[nLineOffset++] = L'#';
                        wszPrintedBufferLine[nLineOffset++] = L'#';
                        wszPrintedBufferLine[nLineOffset++] = L' '; // Print an additional space after each group
                    }
                }
                wszPrintedBufferLine[nLineOffset++] = L' '; // Print a space after each subgroup
            }
            wszPrintedBufferLine[nLineOffset++] = L' '; // Print an additional space after each group
        }

        // Put hte termination characters
        wszPrintedBufferLineInChr[nLineOffsetChr++] = L'\0';
        wszPrintedBufferLine[nLineOffset++] = L'\0';
        BS_ASSERT( nLineOffset == nLineSize );

        g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
        g_cDbgTrace.Print( L"%s %s", wszPrintedBufferLine, wszPrintedBufferLineInChr );
        g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
    }
};

void inline __cdecl CVssFunctionTracer::Throw(
    CVssDebugInfo dbgInfo,          // Caller debugging info
    HRESULT hrToBeThrown,           // The new HR to be thrown
    const WCHAR* pwszMsgFormat,     // Message that will be displayed if throw needed
    ...                             // Additional arguments
    ) throw(HRESULT)
{
    if ( g_cDbgTrace.IsTracingEnabled() )
    {
        if (pwszMsgFormat != NULL)
        {
            CVssOutputBuffer buffer;
            if (buffer.IsBufferValid())
            {
                va_list marker;
                va_start( marker, pwszMsgFormat );
                _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
                va_end( marker );

                g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
                    dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
                g_cDbgTrace.Print( L"%s: %s", m_pwszFunctionName, buffer.GetBuffer() );
                g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
            }
        }

        g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            dbgInfo.m_dwIndent, DEBUG_TRACE_CATCH_EXCEPTIONS );
        g_cDbgTrace.Print( L"%s: Throwing HRESULT code 0x%08lx. "
            L"Previous HRESULT code = 0x%08lx", m_pwszFunctionName, hrToBeThrown, m_hr );
        g_cDbgTrace.PostPrint( DEBUG_TRACE_CATCH_EXCEPTIONS );
    }
    m_hr = hrToBeThrown;
    throw( ( HRESULT )m_hr );
};


void inline __cdecl CVssFunctionTracer::ThrowIf(
    BOOL bThrowNeeded,              // Throw an HR if and only if bThrowNeeded is TRUE.
    CVssDebugInfo dbgInfo,          // Caller debugging info
    HRESULT hrToBeThrown,           // The new HR to be thrown
    const WCHAR* pwszMsgFormat,     // Message that will be displayed if throw needed
    ...                             // Additional arguments
    ) throw(HRESULT)

// WARNING: This function clears the ft.hr field if no errors !
//          Also if bThrowNeeded == false then the m_hr is reset to S_OK !

{
    if (!bThrowNeeded)
        {
        m_hr = S_OK;
        return;
        }

    if ( g_cDbgTrace.IsTracingEnabled() )
    {
        if (pwszMsgFormat != NULL)
        {
            CVssOutputBuffer buffer;
            if (buffer.IsBufferValid())
            {
                va_list marker;
                va_start( marker, pwszMsgFormat );
                _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
                va_end( marker );

                g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
                    dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
                g_cDbgTrace.Print( L"%s: %s", m_pwszFunctionName, buffer.GetBuffer() );
                g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
            }
        }

        g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            dbgInfo.m_dwIndent, DEBUG_TRACE_CATCH_EXCEPTIONS );
        g_cDbgTrace.Print( L"%s: %s HRESULT code 0x%08lx. "
            L"Previous HRESULT code = 0x%08lx",
            bThrowNeeded? L"Throwing": L"Tracing",
            m_pwszFunctionName, hrToBeThrown, m_hr );
        g_cDbgTrace.PostPrint( DEBUG_TRACE_CATCH_EXCEPTIONS );
    }

    m_hr = hrToBeThrown;
    throw( ( HRESULT )m_hr );
};

//
//  Messages displayed at the console (only for test and demo purpose).
//

void inline __cdecl CVssFunctionTracer::Msg(
        const WCHAR* pwszMsgFormat,     // Message that will be displayed
        ...
        )
{
    USES_CONVERSION;

    _ASSERTE(pwszMsgFormat);

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        wprintf( L"%s\n", W2CT(buffer.GetBuffer()) );
    }
}


void inline __cdecl CVssFunctionTracer::MsgNoCR(
        const WCHAR* pwszMsgFormat,     // Message that will be displayed
        ...
        )
{
    USES_CONVERSION;

    _ASSERTE(pwszMsgFormat);

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        wprintf( L"%s", W2CT(buffer.GetBuffer()) );
    }
}


void inline __cdecl CVssFunctionTracer::Err(
        CVssDebugInfo dbgInfo,          // Caller debugging info
        HRESULT hrToBeThrown,           // The new HR to be thrown
        const WCHAR* pwszMsgFormat,     // Error message that will be displayed
        ...
        )
{
    USES_CONVERSION;

    _ASSERTE(pwszMsgFormat);

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        // Message box
        CVssOutputBuffer buffer2;
        if (!buffer2.IsBufferValid())
            throw(E_OUTOFMEMORY);

        _snwprintf(buffer2.GetBuffer(), buffer2.GetBufferSize(), L"%s(%ld)\n%s @ [%08lx,%08lx], PID=%ld, TID=%ld\n%s",
            dbgInfo.m_wszFile, dbgInfo.m_ulLine,
            m_pwszFunctionName, dbgInfo.m_dwIndent, dbgInfo.m_dwLevel,
            GetCurrentProcessId(), GetCurrentThreadId(),
            buffer.GetBuffer()
            );

        ::MessageBoxW( NULL, buffer2.GetBuffer(), L"Error", MB_OK);

        if ( g_cDbgTrace.IsTracingEnabled() )
        {
            g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
                dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
            g_cDbgTrace.Print( L"%s: %s", m_pwszFunctionName, buffer2.GetBuffer() );
            g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
        }

        wprintf( L"Error: %s\n", W2CT(buffer2.GetBuffer()) );

    }

    if (hrToBeThrown)
    {
        m_hr = hrToBeThrown;
        throw( ( HRESULT )m_hr );
    }
}

//
//  Informative message boxes (only for test and demo purpose).
//

void inline __cdecl CVssFunctionTracer::MsgBox(
        const WCHAR* pwszMsgTitle,      // Title of the Message box
        const WCHAR* pwszMsgFormat,     // Message that will be displayed
        ...
        )
{
    USES_CONVERSION;

    _ASSERTE(pwszMsgTitle);
    _ASSERTE(pwszMsgFormat);

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        ::MessageBox(NULL, W2CT(buffer.GetBuffer()), W2CT(pwszMsgTitle), MB_OK);
    }
}


void inline __cdecl CVssFunctionTracer::ErrBox(
        CVssDebugInfo dbgInfo,          // Caller debugging info
        HRESULT hrToBeThrown,           // The new HR to be thrown
        const WCHAR* pwszMsgFormat,     // Error message that will be displayed
        ...
        )
{
    USES_CONVERSION;

    _ASSERTE(pwszMsgFormat);

    CVssOutputBuffer buffer;
    if (buffer.IsBufferValid())
    {
        va_list marker;
        va_start( marker, pwszMsgFormat );
        _vsnwprintf( buffer.GetBuffer(), buffer.GetBufferSize(), pwszMsgFormat, marker );
        va_end( marker );

        if ( g_cDbgTrace.IsTracingEnabled() )
        {
            g_cDbgTrace.PrePrint( dbgInfo.m_wszFile, dbgInfo.m_ulLine,
                dbgInfo.m_dwIndent, dbgInfo.m_dwLevel );
            g_cDbgTrace.Print( L"%s: %s", m_pwszFunctionName, buffer.GetBuffer() );
            g_cDbgTrace.PostPrint( dbgInfo.m_dwIndent );
        }

        ::MessageBox(NULL, W2CT(buffer.GetBuffer()), L"Error", MB_OK);
    }

    if (hrToBeThrown)
    {
        m_hr = hrToBeThrown;
        throw( ( HRESULT )m_hr );
    }
}


/*++

Routine Description:

    Traces the COM error description. Can be called after automation COM calls
    (for example XML or COM+ related)

--*/
void inline CVssFunctionTracer::TraceComError()
{
    CVssFunctionTracer ft(VSSDBG_GEN, L"CVssFunctionTracer::TraceComError");

    CComPtr<IErrorInfo> pErrorInfo;
    HRESULT hr2 = ::GetErrorInfo(0, &pErrorInfo);
    if (SUCCEEDED(hr2)) {
        if (pErrorInfo != NULL) {
            BSTR bstrDescription;
            HRESULT hr3 = pErrorInfo->GetDescription(&bstrDescription);
            if (SUCCEEDED(hr3)) {
                ft.Trace(VSSDBG_GEN, L"Error info description: %s", bstrDescription);
                ::SysFreeString(bstrDescription);
            } else
                ft.Trace(VSSDBG_GEN, L"Warning: Error getting error description = 0x%08lx", hr3);
        }
    }
    else
        ft.Trace(VSSDBG_GEN, L"Warning: Error getting error info = 0x%08lx", hr2);
}


void inline __cdecl CVssFunctionTracer::LogError(
    IN  DWORD dwEventID,                    // The ID of the event
    IN  CVssDebugInfo dbgInfo,              // Caller debugging info
    IN  WORD wType                          // By default it is EVENTLOG_ERROR_TYPE
    )
{
    CVssFunctionTracer ft(VSSDBG_GEN, L"CVssFunctionTracer::LogError");

    try
    {
        LPCWSTR  ppwszStrings[x_nVssMaxDebugArgs];
        CHAR    szFileLine[32];
        CHAR    szTemp[34];  //  Max length of string from _ultoa()

        // Create the four lines of binary data output in the data section of the event log message.
        // First the Caller debugging info:
        ::strncpy( szFileLine, dbgInfo.m_szFileAlias, 8 );
        ::_ultoa( dbgInfo.m_ulLine, szTemp, 10 );
        ::strncpy( szFileLine + 8, szTemp, 8 );  // strncpy has the nice property of zeroing out unuse chars.
        // Now info on the ft at point of construction:
        ::strncpy( szFileLine + 16, m_szFileAlias, 8 );
        ::_ultoa( m_ulLine, szTemp, 10 );
        ::strncpy( szFileLine + 24, szTemp, 8 );  // strncpy has the nice property of zeroing out unuse chars.

        // Fill out the strings that are given as arguments
        WORD wNumStrings = dbgInfo.m_wNumStrings;
        for( WORD wIndex = 0; wIndex < dbgInfo.m_wNumStrings; wIndex++ )
            ppwszStrings[wIndex] = const_cast<LPCWSTR>(dbgInfo.m_ppwszStrings[wIndex]);

        // Get a handle to use with ReportEvent()
        HANDLE hEventSource = ::RegisterEventSourceW(
            NULL,                           //  IN LPCWSTR lpUNCServerName,
            x_wszEventLogVssSourceName        //  IN LPCWSTR lpSourceName
            );
        if (hEventSource == NULL)
            ft.Throw( VSSDBG_SHIM, E_UNEXPECTED, L"Error on RegisterEventSourceW 0x%08lx", GetLastError());

        // Write to event log.
        BOOL bRet = ::ReportEventW(
            hEventSource,                   //  IN HANDLE     hEventLog,
            wType,                          //  IN WORD       wType,
            0,                              //  IN WORD       wCategory,
            dwEventID,                      //  IN DWORD      dwEventID,
            NULL,                           //  IN PSID       lpUserSid,
            wNumStrings,                    //  IN WORD       wNumStrings,
            sizeof( szFileLine ),           //  IN DWORD      dwDataSize,
            ppwszStrings,                   //  IN LPCWSTR   *lpStrings,
            szFileLine                      //  IN LPVOID     lpRawData
            );
        if ( !bRet )
            ft.Trace( VSSDBG_SHIM, L"Error on ReportEventW 0x%08lx", GetLastError());

        // Close the handle to the event log
        bRet = ::DeregisterEventSource( hEventSource );
        if ( !bRet )
            ft.Throw( VSSDBG_SHIM, E_UNEXPECTED, L"Error on DeregisterEventSource 0x%08lx", GetLastError());
    }
    VSS_STANDARD_CATCH(ft)
}

//
//  Set the file alias to unknown in case a module doesn't set it's alias.
//
#undef VSS_FILE_ALIAS
#define VSS_FILE_ALIAS "UNKNOWN"


#endif // __VSS_DEBUG_HXX__