Many MSI calls can return the user cancel message, not just
::MsiProcessMessage(). It is possible some other call ate the return
value. The WcaUtil functions handle this sort of thing for you.
DONG LEE wrote:
> Hi all,
>
> I am trying to detect whether a user cancels within a custom action by doing
>
> the following
>
> UINT __stdcall CA()
> {
> int retVal = 0;
> PMSIHANDLE hRecord = MsiCreateRecord(1);
> ...
> SomeLongOperation(); // trigger cancellation while this function is
> running
>
> MsiRecordSetString(hRecord, 0, L"[1]");
> MsiRecordSetString(hRecord, 1, L"Some Message");
> retVal = MsiProcessMessage(hInstall, INSTALLMESSAGE_INFO, hRecord);
> if(retVal == IDCANCEL)
> {
> MsiLogWrapper(L"User cancellation is detected!");
> return ERROR_USER_EXIT;
> }
> else
> {
> MsiLogWrapper(L"MsiProcessMessage() returned %d", retVal);
> }
> ...
> }
>
> The problem is that the value returned by MsiProcessMessage() is always 0.
> And I've confirmed that the installation was cancelled during the
> SomeLongOperation() was running,and the string L"Some Message" is properly
> logged. What is wrong in this
> case? am I missing anything? The CA is scheduled to be a deferred and
> no-impersonate action.
> I wanted to detect it so that I could return ERROR_USER_EXIT from the CA.
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