Re: Validating IP Addresses - C# Discussion Boards

28-Mar-09 0:51

I need some Idea to implement this .

1.User will download One exe from my web sites. [Windows Application ]
2.When user run that exe, It will perform some operation on client system and it will call one of my web services to update my database with some information.

Is it possible to create the dynamic build with each user ID. Means I need to identify that user that who is calling my web services and based on that I will update my database.
Say when it call my webmethod updateDB, it will call like
updateDB(int userID, string systeminfo)
Here I need to identify the UserID.

Any Suggestion or any other idea to achieve this ?

Thanks in advance !!

cheers,
Abhijit
CodeProject MVP

Eddy Vluggen28-Mar-09 1:33

28-Mar-09 1:33

Just reformulating your question, to verify that I've understood the question. You want to embed some UserID-marker in your excutable/class library, before it gets downloaded and installed?

I are troll Smile | :)

Abhijit Jana28-Mar-09 1:36

28-Mar-09 1:36

Eddy Vluggen wrote:
You want to embed some UserID-marker in your excutable/class library, before it gets downloaded and installed?

Exactly Eddy Thumbs Up | :thumbsup:

. And its a windows application. Any idea
Thanks in advance !!

cheers,
Abhijit
CodeProject MVP

Eddy Vluggen28-Mar-09 1:50

28-Mar-09 1:50

My original suggestion would be to read the MAC-address once you're on the client, and send that back, but that's private information of the customer, and in some countries you'd need the clients' consent to do so. That's one option down.

Another approach would be to compile a personalized version, build and create a setup, prior to downloading. That would mean that there's a delay in the download, and possibly a rather huge load on your webserver. That's two options down.

Perhaps you can download an addendum after the first install? That wouldn't delay the initial download, and you could easily compile a small classlibrary. The application shouldn't be able to run without this library, and it should be signed (to prevent tampering).

Perhaps you can even delay the compiling and the building; if you were to download the sourcecode for your custom key-classlibrary, you could compile once it's downloaded. That would make it harder to sign that classlib, but would remove the compilingprocess from your server and onto the client-machine.

I hope that someone can give some idea's that are more efficient/easier to implement Smile | :)

I are troll Smile | :)

Abhijit Jana28-Mar-09 2:03

28-Mar-09 2:03

First of all thanks for your time Smile | :)

Eddy Vluggen wrote:
approach would be to compile a personalized version, build and create a setup, prior to downloading.

How will I do that? Suppose user click on download and I generate the userID as U123. Now how do i embed it with that exe, and I need to use the same from exe to call my web service and database based on userID.

Please help.

Thanks!

cheers,
Abhijit
CodeProject MVP

Eddy Vluggen28-Mar-09 2:28

28-Mar-09 2:28

I've never done this, but have seen something similar in ASP.NET. You can catch the moment that someone wants to download a file. First, you'd have to encrypt the string and embed it in your sourcecode. The WebApp can only compile your application if it has access to the source-code of what it's supposed to compile. That's why I suggested that you put it in a classlibrary, besides the applications' executable.

The steps involved would be something like this;
- Generate a key, crypt it, and add the key to the DB as "taken".
- Write the source for a dll that returns this key on demand

When you start your executable;
- Check if your classlibrary is in place, if not:
- Start the download of the class-library (from code, or manual)
- The WebApp gets requested to download a file, compiles the classlib with the embedded string and push the generated file.

I'll try to build a small prototype to do this thing, might take a while Smile | :)

I are troll Smile | :)

Abhijit Jana28-Mar-09 2:42

28-Mar-09 2:42

Eddy Vluggen wrote:

When you start your executable;
- Check if your classlibrary is in place, if not:
- Start the download of the class-library (from code, or manual)
- The WebApp gets requested to download a file, compiles the classlib with the embedded string and push the generated file.

Eddy thats sounds good. and am starting some prototyping. Thanks again.

Eddy Vluggen wrote:
I'll try to build a small prototype to do this thing, might take a while

Not a Issue. Smile | :)

Please update me on same.

Thanks!!! Rose | [Rose]

cheers,
Abhijit
CodeProject MVP

Abhijit Jana28-Mar-09 3:03

28-Mar-09 3:03

Eddy, one question

Eddy Vluggen wrote:
compiles the classlib with the embedded string and push the generated file.

How will I get that string? If in-between of that one more request come then what happen?

cheers,
Abhijit
CodeProject MVP

Eddy Vluggen28-Mar-09 4:34

28-Mar-09 4:34

Well, that's the string that's unique for the download. You can base that on the browser-information, or you might want to use a query-string variable to set it. You should be able to trackback this information to previously entered registration-details.

In other words, in that place you'd typically want the reference to the user that's currently logged in Smile | :)

I are troll Smile | :)

Re: Game development with C#

S. Senthil Kumar28-Mar-09 3:49

S. Senthil Kumar

28-Mar-09 3:49

How about creating a GUID and putting it into a config file that then gets downloaded with the application? Or are you trying to implement some kind of licensing scheme?

Regards
Senthil [MVP - Visual C#]
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Game development with C#

Supra228-Mar-09 0:45

Supra2

28-Mar-09 0:45

Hi,
I want to develop cards game (.jpg,.jpeg) using C#. Please let me know is C# is a better way to do it. If any one have sample source code which loads one main image in a background and other card images as per the logic on that will help.

Thnks

Eddy Vluggen28-Mar-09 1:29