How to know when a topic does not exist

I have an app that is created with Visual Studio 6, which
does not have native support for HTML help (upgrading VS is
currently not an option). I have an HTML help that I would like to
call from my app. I need to call the html help with a context id
number. Since there is no html help calls in this version of VS, I
am calling hh.exe directly using ShellExecute ("hh.exe -mapid
<id> <chm file>"). I dont know of any other way. The
problem I am having is that there are times when my app and the
help may be out of sync. It is possible that my app will call the
help with an id that does not exist in the help. In WinHelp, the
user would get a message indicating that the topic did not exist.
Unfortunately, hh.exe does not return any messages. This makes the
users think something is wrong with the app.
Am I doing this the right way? Is there a way to find out if
a topic exists and notify the user if it does not?
Thanks in advance for you help.
LA

Hi LAYALA,
We also develop with Visual Studio 6. You can override the
WinHelp calls and redirect to HtmlHelp. Our app was originally
developed using WinHelp. We made the change to HTMLHelp several
years back and my developer claims it only took one line of code,
though he's never told me what that line is. If nobody enters into
this forum, I'll ask him tomorrow. I'm on Paciifc time so it will
be quite a few hours from now.
John

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hi,
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With regards,
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How to handle "The specified resource does not exist" exception while using entity group transactions to purge WADLogs table

Hi,
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Is this an efficient way to purge the WADLogs table? If not, what can make this better?
Is this the correct way to handle the "Specified resource does not exist exception"? If not, how can I make this better?
Would this logic fail in any particular case?
How would this approach change if this code is in a worker which has multiple instances deployed?
I have come up with this code by referencing the solution given
here by Keith Murray.

Hi Nikhil,
Thanks for your posting!
I tested your and Keith's code on my side, every thing worked fine. And when result is null or "result.count()<0", the While() loop is break. I found you code had some logic to handle the error "ResourceDoesNotExist" .
It seems that the code worked fine. If you always occurred this error, I suggest you could debug your code and find which line of code throw the exception.
>> Is this an efficient way to purge the WADLogs table? If not, what can make this better?
Base on my experience, we could use code (like the above logic code) and using the third party tool to delete the entities manually. In my opinion, I think the code is every efficient, it could be auto-run and save our workload.
>>Is this the correct way to handle the "Specified resource does not exist exception"? If not, how can I make this better?
In you code, you used the "recordDoesNotExistExceptionOccured " as a flag to check whether the entity is null. It is a good choice. I had tried to deleted the log table entities, but I used the flag to check the result number.
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>>How would this approach change if this code is in a worker which has multiple instances deployed?
You don't change anything expect the "else" block. It would work fine on the worker role.
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Regards,
Will
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Edited by: Maria Elena Fernandez on Feb 10, 2010 12:52 PM

Hi again Oliver.
Are you sure that ROW-LEVEL Conflict handling should detect the row with conflict and download the others two child register trought GETDAIL?
I've just checked it again but it continues without working. After the conflict, none child is downloaded to my device.
According to your two opcions:
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2- Imposible too becouse we've already implemented the swcv in a production scenario. The application is already running and to change the model suppose a long time.
I explain you the scenario again with an graphical example:
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parent structure : ID1(key), date,
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ID1, 2, IMP     --> ID1, 2, SEÑ
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parent structure : ID1(key), date, ....
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And that is the problem, different states between R3 and device.   I should need that the state in device for the others two children will be also IMP if R3 has preference or the two children will be SEÑ in R3 if the device has preference. But Now neither children in R3 nor children in Device are updated . Only the first which generate the conflict is deleted from device ( normal because it was still in the queue from the device before syncronice.
Best regards.
Edited by: Maria Elena Fernandez on Feb 11, 2010 8:32 AM
Edited by: Maria Elena Fernandez on Feb 11, 2010 8:43 AM

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Error when attempting to select from external table:
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