i developed a software , and i made a setup of the project
and the setup installation default path is
c:\ProgramFiles\[Manufacture]\[Company Name]\[Project Name]\
in this path my software is installed
in my project i need to
1)write the input values given by user in a text file
2)update the Ms acess Database
3)save a image
now when the user runs the software
it is giving the error message
"Access to the File inputs.txt is denied"
since there is no permission to user to read and write a file
even i cannot modify a dotnet source in c:\\ drive
As I said in my first post, I do not have an answer to your problem.
However, if the cause of the difficulty is rules of the systems administrators at your various clients, you must find a strategy to accommodate these rules.
All of these clients MUST have a location on their network where databases are allowed both read and write access, otherwise those companies simply couldn't do any work. What you have to do is find out what that location is for those sites and identify a way to allow installation to the correct place.
As far as writing user input is concerned, the solution will depend on whether that input needs to be seen by all users or just the user that made the input. For all user access, store it in a DB at the location identified above. For access on a peruser basis take a look at the documentation for Environment.SpecialFolder to see if anything there meets your needs.
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I am doing a sample program to test "managed and unmanaged interoperability". I have a c++ function which takes vector and gives me some result back. This vector i want to pass from c# program. Can any one of you please let me know, the C# Equivalent of a C++ std::vector? If possible please provide me some sample code. Thanks in adavance.
There is nothing you can pass from C# that is going to turn into a std::vector. Your best bet, IMO, is to pass a list into a C++/CLI dll, which constructs a vector and pases it to your function.
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I don't think you can create a vector and pass to the native function. Best method would be to use C++/CLI to wrap the native function. Write a function which takes a managed list in the C++/CLI class. Inside this function, create a std::vector with the values from list and pass to the native method. You can refer the C++/CLI project's DLL and call the methods from C# easily.
I want to pass the vector from c# program using DllImport.
Well, I think you haven't got what I said so far. To reiterate, you can't pass a vector from C# using DllImport. For doing that you have to use C++/CLI to create a proxy class between your C# and C++ application. Follow the below steps.
1 - Create a C++/CLI library project. Add reference to the native DLL here
2 - Write a function that takes List(T)
3 - Iterate over the elements in this list, create a vector and push each item to it.
4 - Now call the native C++ method by passing this vector.
Since List(T) is a managed type and C++/CLI produces mixed mode assembly, you will be able to access it from C# easily. Just refer the C++/CLI dll, create a List(T) from C# project and pass to the method.
*T will the type of the object which you want to pass.
Can anybody please help me to resolve below described issue?
using DirectShow i build application which show live preview and also capture video frames.
there is start/stop button available on user interface which are used for starting and stoping video frames capturing.
But when a user click on start/stop button, my preview window become totally black coloured for some time and i lost video frames during that period.
I'd guess that whatever processing you're doing in the start/stop event is taking too long, and locking out the video capture. However, without a lot more information it's pretty hard to really know what's wrong...
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