I wanna create csv download service on web.
Is there any way to get line separator for user OS ?
I'm using Java for server programming.
And there are some way to get line separator, but they are depend on server OS,
not user :<
Unfortunately, you're the server in this case so, unless the user tells you what their line ending is with their request, you won't know.
Probably the simplest solution is to allow the user to select manually, with a drop-down box, then use that information to generate the format you want.
Related
I'm writing C++ desktop application that allows users to sign in on some web service. By technical requirements, user can check 'remember me' checkbox and after he close app and run it again, app should re-sign in with email and password user input first time.
I know that it is not safe and strongly not recommended to store passwords on disk but i have no idea how to remember user's password in safe way. Is there any best practices or advices for such case?
Note: my application is for Windows/Ubuntu/MacOS so it will be cool to know about OS-independent ways. My app is C++11/Qt5.4 based.
The way that you're supposed to implement this kind of design is to issue the user a SessionID that is stored locally, and which is used to authenticate and access their specific interface. Then, if they wish to log in again at a later time, simply use the stored SessionID, and if they wish to log in as someone else, clear the SessionID and then log them in like normal, issuing a new SessionID. That way you aren't storing sensitive information on their computer.
I am working in an application. In this user enter his email id to get the some application setting.
After some time he will get mail with settings embedded and an apply button. Once user click on that we need to set the setting (in some file or registry).
Desktop application will read the setting(File / Registry) once it is launched.
This is the requirement. My question is,
How to call Win32/MFC application on clicking apply button with setting parameter.
You cannot arbitrarily execute something in an email message for obvious reasons.
The closest integration you could get would be to pass the configuration data as an argument to a custom URL handler in an HTML anchor; your mileage would likely vary wildly depending on browser/email client/webmail service so this is a bad idea.
Far better to simply send the configuration as an attachment with a file extension associated with your application and tell the user to open it, your app reads the config file and your done.
I am tasked with creating a web form for people to update their details. I have existing data which I need to authenticate users against to make sure we are updating the correct person. I get the feeling that if I code this from scratch I will be reinventing the wheel.
I'm looking either for an online survey solution like SurveyMonkey (but not SurveyMonkey as it does no have automatic authentication) or a web form system that I can install and configure.
Seems like I need to build my own.
I will code in PHP and use a MySQL database. The login screen will take three bits of information, which if found in a record in the database, will show the user a screen with their old data, and a form for updating this data. They enter their new data and hit submit which will put their information into another table in the database.
Nothing to hard but I'd rather use a pre-made system which is already debugged and comes with with some built in tools so the users can manipulate the data.
i would like to know a good software engineering way to store user preferences in a web app.
to clarify further, my app has commands that the user can choose, so
i added a button that when some commands are selected, these commands are saved as favorites somewhere on the client's machine, that way if user X logs in at anytime he can check his favorite commands and load them automatically..
how to save these commands and where? and taking into consideration that several users using the same computer should not have access to each's favorites, so i want the favorite to be saved based on userID. where and how to save them? cookies? xml? and using php or javascript is better?
thx a lot for your help:)
The best way to do this is have them log in whenever accessing your site. Then you store all of the preferences on your server and deliver them down through your UI to their browser. This will mean that it doesn't matter what browser/device they happen to be using, their settings will follow them.
I'm not sure I like the idea of modifying someone's "favorites" in their browser. I'm not sure I'd stick with a site that wanted that level of control over my browser.
Now, if you are just talking about having a page on your site that had a list of "favorites", then that's okay. Just keep it server side.
Most typical would be to store them in a database of some sort on the server side, easily accessable by the UserID. Keep in mind 'preferences' are different from 'state'. State variables are usually stored via whatever cookie mechanism you are using.
What is your web app using to hold the data on the back-end? Most likely, that is where you will want to store user preferences. Since you will already be accessing that back-end (a database, perhaps?) to authenticate the user for login, retrieving that user's preferences is a simple step from there.
The real story here is that we need more details. Are you storing authentication information in a database, or something else? How are your user sessions stored (i.e., when a user logs in, how does your web app tell that his browser is logged in on subsequent requests)? Your question seems to state this, but to clarify, are these PHP pages containing some amount of Javascript?
Depends on your requirements. You will need to choose either to store user preferences in your database, provided your users authenticate, this is probably preferred solution. But if it meets your requirements you can save user preferences in a cookie.
Here is are javascript functions and jquery plugin with examples on how to work with cookies.
I'm currently using ShellExecute "open" to open a URL in the user's browser, but running into a bit of trouble in Win7 and Vista because the program runs elevated as a service.
When ShellExecute opens the browser, it seems to read the "Local Admin" profile instead of the user's. So for example, if the user at the keyboard has Firefox as his default browser, it may open IE (which is the admin's default).
I know that the "runas" verb can be used to elevate, but how do you do it the other way around? Is there a way to open a URL in the default browser on a standard user's desktop from a service?
ShellExecute will execute the program in the context of the same session and same user as the process you are running.
If you'd like to use a different session or user token you can use the CreateProcessAsUser Win32 API.
There are several ways to obtain a user token, for example you can call the Win32 API:
LogonUser if you know the username and password
WTSQueryUserToken for any given session ID.
OpenProcessToken if you have another process handle
After a while of testing, the best way to determine the default browser is the following:
NOTE: It is strange but it's true...
It has nothing to say that an application is the default application for
some file type or web protocol like 'http'. What matters to determine the default
web browser is just what is registered in the start menu entry (see reg key below).
So forget all the HKCR\http, HKCU\Software\Classes\http, HKLM\Software\Classes\http and their friends.
read from "HKEY_CURRENT_USER\Software\Clients\StartMenuInternet"
read command line from "HKEY_LOCAL_MACHINE\Software\Clients\StartMenuInternet\\shell\open\command"
truncate the command line after ".exe"
Of course you need to impersonate as the logged on user first.
If this solution does not work (like with w2k), use the handler for the http protocol.
To actually start the default browser from a service we use an extra process which is within the service using the logged on user-context. This process starts the above commandline (using ShellExecute on platforms >= Vista). Be sure to use same integrity level (medium) as a default user (else IE won't work because it uses DDE).
HTH.
Aaron Margosis has a seven-step native code example at http://blogs.msdn.com/aaron_margosis/archive/2009/06/06/faq-how-do-i-start-a-program-as-the-desktop-user-from-an-elevated-app.aspx. Won't help you from your service if that is what you have - I agree your service shouldn't be trying to launch an app as the logged in user, especially since there might not be one.