Re: ShellExecuteEx and "runas" Dialog "Cancel"-Button pressed Issue,...

Hi,

i have to ask the User for a Username and a Password and then finally
execute a file with the Credentials. On Windows XP,2003,Vista and 7 i
use the CredUIPromptForCredentials/CredUIPromptForWindowsCredentials
to get the credentials and then execute my executable with the
information.
This is easily straightforward and good to handle. When the User presses
"Cancel"
on the Credentioals form, i get a ERROR_CANCELED as return value. So there
is no more reason to continue on the information and bufers can be cleaned
and
released. But on Windows 2000 i faced two Problems and solved them
partially.

1. The functions mentioned above are not available on W2K. I made a deeper
look into
a application that displays the user credentials dialog on windows 2000
and found
out that it uses ShellExecuteEx for that. Investigating more deeper lead
me to the
information that the dialog is not a subsequent call to a function like
the ones above,
more its a Dialog Creation from a resource in Shell32.dll, so there is no
(real) chance
to reuse the Dialog without coding the functionality around it or just by
simply invoking
a function like the ones above. So i decided to call ShellExecuteEx with
"runas" verb,
which is pretty what i wanted finally, but here another problem start,
while the first
has been solved:

2. The second problem is that, when the dialog is displayed and you press
"Cancel",
you get a "5" (SE_ERR_ACCESSDENIED) for the SHELLEXECUTEINFO::hInstApp but
there is nothing that made a access denied problem, since you skip the
operation.
This is really strange and more strange is, that it is regular response to
the cancel
button press. Not a good solution, because you get a SE_ERR_ACCESSDENIED
too
for a real ACCESS_DENIED (5). But i just want something like ERROR_CANCEL.
I
hope you understand now, what is so strange here,...Either they missed the
problem
or i dont know what lead the MS developers to that thing,...

Does someone have a easy workarround for that, without hooking the
Dialog and Intercepting the Cancel Button pressed for that, storing the
result and comparing later with teh hInstApp?

Thanks in advance,...

regards

Kerem

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Beste Gr?sse / Best regards / Votre bien devoue
Kerem G?mr?kc?
Latest Project: http://www.pro-it-education.de/software/deviceremover
Latest Open-Source Projects: http://entwicklung.junetz.de
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