Calling QT4.0 Function from C#

Help Needed to call QT Function from C#. Here is the explanation. I have developed an application in QT. I have a function with the following signature in a QT Gui Project. QString Cal(QString a) { QString s; . . . //code go here . . . . return s; } I want to call the above QT Function from C#. I want to pass a string from C# to this function and then want to get the string from this function in C#.? It is to be noted that two variations of the function needs to be implemented. One which will return a string and the other which will return void. And both the functions will take a string as argument. Really Urgent help needed. I can give bonus if this problem is resolved before the deadline. Thank you ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the worker's Worker Legal Agreement). 2) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 3) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Worker in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. * * *This broadcast message was sent to all bidders on Tuesday Jun 1, 2010 6:55:29 AM: Kindly post your bids as soon as possible if you are willing to do this job. ## Platform QT, C#