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Creating a edit control on a dialog box applications that prints "this software has been run X times"

How can I do the above, that is, keep track of the number of times an executable has been opened as do many demo versions?

Thank you
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iportu
Asked:
iportu
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1 Solution
 
SteHCommented:
You need to store the number of times the program was opened in some known but hidden place. This could be a registry key for example. On startup this key is read and incremented and written back. To display its value in an edit box you need to format the integer into a CString:

CString csRes;
csRes.Format ("This software has been used %d times", nRuns);

and set is as window text:

c_ceRuns.SetWindowText (csRes); // c_ceRuns being a control variable for that edit box.
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iportuAuthor Commented:
Thank you SteH, but how do I store the number of times the program has been opened in a registry key?
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SteHCommented:
You need to have write acces to that part of the registry!
RegOpenKeyEx gives you acces to a special subkey of
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE or
HKEY_USERS
with KEY_WRITE accesability at least. Then you create your key and store a value using
RegCreateKeyEx () // creates or opens the key
RegQueryValueEx () // read the value
RegSetValueEx () // set a new value.

and last you close the key using
RegCloseKey ()

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mrwad99Commented:
>> RegOpenKeyEx gives you acces to a special subkey of...

Would it not be easier to use CWinApp::WriteProfileInt ()
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_cwinapp.3a3a.writeprofileint.asp)

and CWinApp::GetProfileInt()

(http://msdn.microsoft.com/library/en-us/vclib/html/_mfc_CWinApp.3a3a.GetProfileInt.asp)

?

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SteHCommented:
Since the technique is normally used by shareware the approach using the std location for profiles will be too easy to track. Remove the key and you can reuse the program against the will of the author. The general approach lets you easier hide the location of the key (if regmon is not in use during installation). Thats why I proposed the general approach.
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iportuAuthor Commented:
Thank you SteH, I got it working
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