C++ ExitOnNull函数代码示例

/********************************************************************
WcaGetRecordFormattedString() - gets formatted string filed from record

********************************************************************/
extern "C" HRESULT WIXAPI WcaGetRecordFormattedString(
    __in MSIHANDLE hRec,
    __in UINT uiField,
    __inout LPWSTR* ppwzData
    )
{
    if (!hRec || !ppwzData)
    {
        return E_INVALIDARG;
    }

    HRESULT hr = S_OK;
    UINT er;
    DWORD_PTR cch = 0;
    PMSIHANDLE hRecFormat;

    // get the format string
    hr = WcaGetRecordString(hRec, uiField, ppwzData);
    ExitOnFailure(hr, "failed to get string from record");

    if (!**ppwzData)
    {
        ExitFunction();
    }

    // hide the nulls '[~]' so we can get them back after formatting
    HideNulls(*ppwzData);

    // set up the format record
    hRecFormat = ::MsiCreateRecord(1);
    ExitOnNull(hRecFormat, hr, E_UNEXPECTED, "Failed to create record to format string");
    hr = WcaSetRecordString(hRecFormat, 0, *ppwzData);
    ExitOnFailure(hr, "failed to set string to format record");

    // format the string
    hr = StrMaxLength(*ppwzData, &cch);
    ExitOnFailure(hr, "failed to get max length of string");

    er = ::MsiFormatRecordW(WcaGetInstallHandle(), hRecFormat, *ppwzData, (DWORD*)&cch);
    if (ERROR_MORE_DATA == er)
    {
        hr = StrAlloc(ppwzData, ++cch);
        ExitOnFailure(hr, "Failed to allocate memory for record string");

        er = ::MsiFormatRecordW(WcaGetInstallHandle(), hRecFormat, *ppwzData, (DWORD*)&cch);
    }
    ExitOnWin32Error(er, hr, "Failed to format string");

    // put the nulls back
    RevealNulls(*ppwzData);

LExit:
    return hr;
}

extern "C" HRESULT WINAPI UpdateThreadCheck(
    __in LPCWSTR wzAppId,
    __in BOOL fTryExecuteUpdate
    )
{
    HRESULT hr = S_OK;
    BOOL fLocked = FALSE;
    BACKGROUND_UPDATE_THREAD_CONTEXT* pContext = NULL;

    ::EnterCriticalSection(&vUpdateThreadLock);
    fLocked = TRUE;

    if (vhUpdateThread)
    {
        DWORD er = ::WaitForSingleObject(vhUpdateThread, 0);
        if (WAIT_OBJECT_0 == er)
        {
            ::CloseHandle(vhUpdateThread);
            vhUpdateThread = NULL;
        }
        else
        {
            hr = S_FALSE;
            ExitFunction();
        }
    }

    pContext = static_cast<BACKGROUND_UPDATE_THREAD_CONTEXT*>(MemAlloc(sizeof(BACKGROUND_UPDATE_THREAD_CONTEXT), TRUE));
    ExitOnNull(pContext, hr, E_OUTOFMEMORY, "Failed to allocate memory for context.");

    hr= StrAllocString(&pContext->pwzApplicationId, wzAppId, 0);
    ExitOnFailure(hr, "Failed to copy app id into context.");

    pContext->fExecuteUpdate = fTryExecuteUpdate;

    vhUpdateThread = ::CreateThread(NULL, 0, BackgroundUpdateThread, reinterpret_cast<LPVOID>(pContext), 0, NULL);
    ExitOnNullWithLastError(vhUpdateThread, hr, "Failed to create background update thread.");

    pContext = NULL;

LExit:
    if (pContext)
    {
        ReleaseStr(pContext->pwzApplicationId);
        MemFree(pContext);
    }

    if (fLocked)
    {
        ::LeaveCriticalSection(&vUpdateThreadLock);
    }

   return hr;
}

HRESULT CpiGetCatalogCollection(
	ICatalogCollection* piColl,
	ICatalogObject* piObj,
	LPCWSTR pwzName,
	ICatalogCollection** ppiColl
	)
{
	HRESULT hr = S_OK;

	ICOMAdminCatalog* piCatalog = NULL;
	IDispatch* piDisp = NULL;

	BSTR bstrName = NULL;

	VARIANT vtKey;
	::VariantInit(&vtKey);

	// copy name string
	bstrName = ::SysAllocString(pwzName);
	ExitOnNull(bstrName, hr, E_OUTOFMEMORY, "Failed to allocate BSTR for collection name");

	// get catalog
	hr = CpiGetAdminCatalog(&piCatalog);
	ExitOnFailure(hr, "Failed to get COM+ admin catalog");

	// get key
	hr = piObj->get_Key(&vtKey);
	ExitOnFailure(hr, "Failed to get object key");

	// get collecton from catalog
	hr = piColl->GetCollection(bstrName, vtKey, &piDisp);
	ExitOnFailure(hr, "Failed to get collection");

	hr = piDisp->QueryInterface(IID_ICatalogCollection, (void**)ppiColl);
	ExitOnFailure(hr, "Failed to get IID_ICatalogCollection interface");

	// populate collection
	hr = (*ppiColl)->Populate();
	if (COMADMIN_E_OBJECTERRORS == hr)
		CpiLogCatalogErrorInfo();
	ExitOnFailure(hr, "Failed to populate collection");

	hr = S_OK;

LExit:
	// clean up
	ReleaseObject(piCatalog);
	ReleaseObject(piDisp);
	ReleaseBSTR(bstrName);
	::VariantClear(&vtKey);

	return hr;
}

// private helper functions
static HRESULT AddFilterToList(SCA_FILTER** ppsfList)
{
	HRESULT hr = S_OK;
	SCA_FILTER* psf = (SCA_FILTER*)MemAlloc(sizeof(SCA_FILTER), TRUE);
	ExitOnNull(psf, hr, E_OUTOFMEMORY, "failed to add filter to filter list");

	psf->psfNext = *ppsfList;
	*ppsfList = psf;

LExit:
	return hr;
}

HRESULT MqiInitialize()
{
	HRESULT hr = S_OK;

	// load mqrt.dll
	ghMQRT = ::LoadLibraryW(L"mqrt.dll");
	ExitOnNull(ghMQRT, hr, E_FAIL, "Failed to load mqrt.dll");

	// get MQCreateQueue function address
	gpfnMQCreateQueue = (MQCreateQueueFunc)::GetProcAddress(ghMQRT, "MQCreateQueue");
	ExitOnNull(gpfnMQCreateQueue, hr, HRESULT_FROM_WIN32(::GetLastError()), "Failed get address for MQCreateQueue() function");

	// get MQDeleteQueue function address
	gpfnMQDeleteQueue = (MQDeleteQueueFunc)::GetProcAddress(ghMQRT, "MQDeleteQueue");
	ExitOnNull(gpfnMQDeleteQueue, hr, HRESULT_FROM_WIN32(::GetLastError()), "Failed get address for MQDeleteQueue() function");

	// get MQPathNameToFormatName function address
	gpfnMQPathNameToFormatName = (MQPathNameToFormatNameFunc)::GetProcAddress(ghMQRT, "MQPathNameToFormatName");
	ExitOnNull(gpfnMQPathNameToFormatName, hr, HRESULT_FROM_WIN32(::GetLastError()), "Failed get address for MQPathNameToFormatName() function");

	// get MQGetQueueSecurity function address
	gpfnMQGetQueueSecurity = (MQGetQueueSecurityFunc)::GetProcAddress(ghMQRT, "MQGetQueueSecurity");
	ExitOnNull(gpfnMQGetQueueSecurity, hr, HRESULT_FROM_WIN32(::GetLastError()), "Failed get address for MQGetQueueSecurity() function");

	// get MQSetQueueSecurity function address
	gpfnMQSetQueueSecurity = (MQSetQueueSecurityFunc)::GetProcAddress(ghMQRT, "MQSetQueueSecurity");
	ExitOnNull(gpfnMQSetQueueSecurity, hr, HRESULT_FROM_WIN32(::GetLastError()), "Failed get address for MQSetQueueSecurity() function");

	hr = S_OK;

LExit:
	return hr;
}

static HRESULT AddWebErrorToList(SCA_WEB_ERROR** ppsweList)
{
    HRESULT hr = S_OK;

    SCA_WEB_ERROR* pswe = static_cast<SCA_WEB_ERROR*>(MemAlloc(sizeof(SCA_WEB_ERROR), TRUE));
    ExitOnNull(pswe, hr, E_OUTOFMEMORY, "failed to allocate memory for new web error list element");

    pswe->psweNext = *ppsweList;
    *ppsweList = pswe;

LExit:
    return hr;
}

static HRESULT NewSqlStr(
    __out SCA_SQLSTR** ppsss
    )
{
    HRESULT hr = S_OK;
    SCA_SQLSTR* psss = static_cast<SCA_SQLSTR*>(MemAlloc(sizeof(SCA_SQLSTR), TRUE));
    ExitOnNull(psss, hr, E_OUTOFMEMORY, "failed to allocate memory for new sql string element");

    *ppsss = psss;

LExit:
    return hr;
}

static HRESULT NewDb(
    __out SCA_DB** ppsd
    )
{
    HRESULT hr = S_OK;
    SCA_DB* psd = static_cast<SCA_DB*>(MemAlloc(sizeof(SCA_DB), TRUE));
    ExitOnNull(psd, hr, E_OUTOFMEMORY, "failed to allocate memory for new database element");

    *ppsd = psd;

LExit:
    return hr;
}

static HRESULT AddMimeMapToList(SCA_MIMEMAP** ppsmmList)
{
    HRESULT hr = S_OK;

    SCA_MIMEMAP* psmm = static_cast<SCA_MIMEMAP*>(MemAlloc(sizeof(SCA_MIMEMAP), TRUE));
    ExitOnNull(psmm, hr, E_OUTOFMEMORY, "failed to allocate memory for new mime map list element");

    psmm->psmmNext = *ppsmmList;
    *ppsmmList = psmm;
    
LExit:
    return hr;
}

static HRESULT NewAppExt(
    SCA_WEB_APPLICATION_EXTENSION** ppswappext
)
{
    HRESULT hr = S_OK;
    SCA_WEB_APPLICATION_EXTENSION* pswappext = (SCA_WEB_APPLICATION_EXTENSION*)MemAlloc(sizeof(SCA_WEB_APPLICATION_EXTENSION), TRUE);
    ExitOnNull(pswappext, hr, E_OUTOFMEMORY, "failed to allocate memory for new web app ext element");

    *ppswappext = pswappext;

LExit:
    return hr;
}

static HRESULT ParseWxlControls(
    __in IXMLDOMElement* pElement,
    __in WIX_LOCALIZATION* pWixLoc
    )
{
    HRESULT hr = S_OK;
    IXMLDOMNode* pixn = NULL;
    IXMLDOMNodeList* pixnl = NULL;
    DWORD dwIdx = 0;

    hr = XmlSelectNodes(pElement, L"UI|Control", &pixnl);
    ExitOnLastError(hr, "Failed to get UI child nodes of Wxl File.");

    hr = pixnl->get_length(reinterpret_cast<long*>(&pWixLoc->cLocControls));
    ExitOnLastError(hr, "Failed to get number of UI child nodes in Wxl File.");

    if (0 < pWixLoc->cLocControls)
    {
        pWixLoc->rgLocControls = static_cast<LOC_CONTROL*>(MemAlloc(sizeof(LOC_CONTROL) * pWixLoc->cLocControls, TRUE));
        ExitOnNull(pWixLoc->rgLocControls, hr, E_OUTOFMEMORY, "Failed to allocate memory for localized controls.");

        while (S_OK == (hr = XmlNextElement(pixnl, &pixn, NULL)))
        {
            hr = ParseWxlControl(pixn, dwIdx, pWixLoc);
            ExitOnFailure(hr, "Failed to parse localized control.");

            ++dwIdx;
            ReleaseNullObject(pixn);
        }

        hr = S_OK;
        ExitOnFailure(hr, "Failed to enumerate all localized controls.");
    }

LExit:
    if (FAILED(hr) && pWixLoc->rgLocControls)
    {
        for (DWORD idx = 0; idx < pWixLoc->cLocControls; ++idx)
        {
            ReleaseStr(pWixLoc->rgLocControls[idx].wzControl);
            ReleaseStr(pWixLoc->rgLocControls[idx].wzText);
        }

        ReleaseMem(pWixLoc->rgLocControls);
    }

    ReleaseObject(pixn);
    ReleaseObject(pixnl);

    return hr;
}

static HRESULT GetUserAccountName(
    LPCWSTR pwzKey,
    LPWSTR* ppwzAccount
    )
{
    HRESULT hr = S_OK;

    PMSIHANDLE hView, hRecKey, hRec;

    LPWSTR pwzDomain = NULL;
    LPWSTR pwzName = NULL;

    // create parameter record
    hRecKey = ::MsiCreateRecord(1);
    ExitOnNull(hRecKey, hr, E_OUTOFMEMORY, "Failed to create record");
    hr = WcaSetRecordString(hRecKey, 1, pwzKey);
    ExitOnFailure(hr, "Failed to set record string");

    // open view
    hr = WcaOpenView(vcsUserQuery, &hView);
    ExitOnFailure(hr, "Failed to open view on User table");
    hr = WcaExecuteView(hView, hRecKey);
    ExitOnFailure(hr, "Failed to execute view on User table");

    // fetch record
    hr = WcaFetchSingleRecord(hView, &hRec);
    if (S_FALSE == hr)
        ExitOnFailure(hr = HRESULT_FROM_WIN32(ERROR_NOT_FOUND), "User not found, key: %S", pwzKey);
    ExitOnFailure(hr, "Failed to fetch user record");

    // get user domain
    hr = WcaGetRecordFormattedString(hRec, uqDomain, &pwzDomain);
    ExitOnFailure(hr, "Failed to get domain");

    // get user name
    hr = WcaGetRecordFormattedString(hRec, uqName, &pwzName);
    ExitOnFailure(hr, "Failed to get name");

    // build account name
    hr = CpiBuildAccountName(pwzDomain, pwzName, ppwzAccount);
    ExitOnFailure(hr, "Failed to build account name");

    hr = S_OK;

LExit:
    // clean up
    ReleaseStr(pwzDomain);
    ReleaseStr(pwzName);

    return hr;
}

HRESULT CpiResetObjectProperty(
	ICatalogCollection* piColl,
	ICatalogObject* piObj,
	LPCWSTR pwzPropName
	)
{
	HRESULT hr = S_OK;

	BSTR bstrPropName = NULL;

	long lChanges = 0;

	VARIANT vtVal;
	::VariantInit(&vtVal);

	// allocate property name string
	bstrPropName = ::SysAllocString(pwzPropName);
	ExitOnNull(bstrPropName, hr, E_OUTOFMEMORY, "Failed to allocate deleteable property name string");

	// get value
	hr = piObj->get_Value(bstrPropName, &vtVal);
	ExitOnFailure(hr, "Failed to get deleteable property value");

	hr = ::VariantChangeType(&vtVal, &vtVal, 0, VT_BOOL);
	ExitOnFailure(hr, "Failed to change variant type");

	// if the deleteable property is set
	if (VARIANT_FALSE == vtVal.boolVal)
	{
		// clear property
		vtVal.boolVal = VARIANT_TRUE;

		hr = piObj->put_Value(bstrPropName, vtVal);
		ExitOnFailure(hr, "Failed to get property value");

		// save changes
		hr = piColl->SaveChanges(&lChanges);
		if (COMADMIN_E_OBJECTERRORS == hr)
			CpiLogCatalogErrorInfo();
		ExitOnFailure(hr, "Failed to save changes");
	}

	hr = S_OK;

LExit:
	// clean up
	ReleaseBSTR(bstrPropName);
	::VariantClear(&vtVal);

	return hr;
}

static __callback UINT FAR DIAMONDAPI CabExtractWrite(__in INT_PTR hf, __in void FAR *pv, __in UINT cb)
{
    HRESULT hr = S_OK;
    DWORD cbWrite = 0;

    ExitOnNull(hf, hr, E_INVALIDARG, "Failed to write file during cabinet extraction - no file given to write");
    if (!::WriteFile(reinterpret_cast<HANDLE>(hf), pv, cb, &cbWrite, NULL))
    {
        ExitWithLastError(hr, "failed to write during cabinet extraction");
    }

LExit:
    return FAILED(hr) ? -1 : cbWrite;
}

static HRESULT AddPropertyToList(
    SCA_PROPERTY** ppspList
    )
{
    HRESULT hr = S_OK;
    SCA_PROPERTY* psp = static_cast<SCA_PROPERTY*>(MemAlloc(sizeof(SCA_PROPERTY), TRUE));
    ExitOnNull(psp, hr, E_OUTOFMEMORY, "failed to allocate memory for new property list element");
    
    psp->pspNext = *ppspList;
    *ppspList = psp;
    
LExit:
    return hr;
}