What is the actual MSI mutex?
Thanks
Steve
From: Phil Wilson [via Windows Installer XML (WiX) toolset]
Sent: Tuesday, January 27, 2015 12:59
To: StevenOgilvie
Subject: Re: seeing if a MSI is running using mutex...
It appears that your CreateMutex isn't passing in the actual MSI mutex
in sczMutexName .
---------------
Phil Wilson
On Tue, Jan 27, 2015 at 7:51 AM, StevenOgilvie <sogil...@msn.com> wrote:
> Hi all,
>
> Trying to create a method to detect if ANY MSI is running and if so halt
> bootstrapper...
> I am doing this in C++
>
> I get a successful mutex, but it always returns ERROR_SUCCESS, what am I
> doing wrong?
> thanks
> Steve
>
>
> HANDLE ghMutex = NULL;
> LPCWSTR sczVerifyMSIRunningVariableSet = L"0";
> LPWSTR sczVerifyMSIRunningVariable = NULL;
> LPWSTR sczUnformattedVerifyMSIRunningVariable = NULL;
> LPCWSTR sczMutexName = L"Global\\_MSIExecute";
> LPWSTR sczName = NULL;
> BOOL MutexExist = FALSE;
>
> // get the bootstrapper variable to change
> hr = BalGetStringVariable(WIXSTDBA_VARIABLE_IS_ANOTHER_MSI_RUNNING,
> &sczUnformattedVerifyMSIRunningVariable);
> BalExitOnFailure1(hr, "Failed to get MSI running variable: %ls",
> WIXSTDBA_VARIABLE_IS_ANOTHER_MSI_RUNNING);
> hr = BalFormatString(sczUnformattedVerifyMSIRunningVariable,
> &sczVerifyMSIRunningVariable);
> BalExitOnFailure1(hr, "Failed to format get MSI running variable:
> %ls", sczUnformattedVerifyMSIRunningVariable);
> hr = StrAllocFormatted(&sczName, L"%ls", sczMutexName);
> ::MessageBoxW(m_hWnd, (LPCWSTR)sczName,
> (LPCWSTR)m_pTheme->sczCaption, MB_OK | MB_ICONWARNING);
>
> // check to see if any MSI is running
> ghMutex = ::CreateMutex(
> NULL, // default security attributes
> FALSE, // initially not owned
> sczName); // product name
>
> if (ghMutex != NULL)
> {
> ::MessageBoxW(m_hWnd, L"ghMutex was not null",
> (LPCWSTR)m_pTheme->sczCaption, MB_OK | MB_ICONWARNING);
>
> switch (GetLastError())
> {
> case ERROR_SUCCESS:
> // Mutex created successfully. There is no instance
> running
> ::MessageBoxW(m_hWnd, L"ghMutex: Mutex created
> successfully. There is no instance running FALSE",
> (LPCWSTR)m_pTheme->sczCaption, MB_OK | MB_ICONWARNING);
> MutexExist = FALSE;
> break;
> case ERROR_ALREADY_EXISTS:
> // Mutex already exists so there is a running instance
> ::MessageBoxW(m_hWnd, L"ghMutex: Mutex already exists so
> there is a running instance TRUE", (LPCWSTR)m_pTheme->sczCaption, MB_OK |
> MB_ICONWARNING);
> MutexExist = TRUE;
> break;
> default:
> // Failed to create Mutex by unknown reason
> ::MessageBoxW(m_hWnd, L"ghMutex: Failed to create Mutex
> by unknown reason FALSE", (LPCWSTR)m_pTheme->sczCaption, MB_OK |
> MB_ICONWARNING);
> MutexExist = FALSE;
> break;
> }
> }
>
> if (MutexExist)
> {
> sczVerifyMSIRunningVariableSet = L"1";
> }
>
> // a MSI is installing
> hr =
> m_pEngine->SetVariableString(LPCWSTR(sczVerifyMSIRunningVariable),
> sczVerifyMSIRunningVariableSet);
>
>
>
> --
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>
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