Populate Vector from file and use vector content in different event handler

Question

Hi,

I need to read some settings values from an input file, by means of an openfiledialog and assign these values to a dynamic data structure a vector for example.

Then I need to use these vectors, in another function. I want to read the comma separated  file per line and do a logical test to determine in which vector to put the content on that line.

The questions are:

1.How do I make these vectors globally available in C++;I'm doing the assignment of the vectors content in a button click event handler and I do the calculation that needs to use the vector in a different button click event handler.

This is the header for the function that needs to use the vectors:

void collissionProb3(vector<vector<double> >& multidimvec,int NMAT,int NCELL,double MESHSIZE[],int MATPAP[],double DELTA[],double XT[]);

This works fine if I initialize the vectors in the same event handler where I call collissionProb3, but I need to assign the vectors from a file, then call collissionProb3

2. How does string.split(stringName,separatingChar) work in C++: in VB you can do something like a=string.split(stringName,",")(0) to get the first element of the string before the separating comma in this example.

 

Thanks ,

 

Mugu

Answer 1

You could create the vector variable as a member of a class so that all the methods including the button click handler can access it.

To split the string you can use the strtok function.

 

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«_Superman_»
Microsoft MVP (Visual C++)

Answer 2

 

Hi Mugu,

 

I agree with Superman's idea, and for second question, if you use CLI/C++, you can use function split of  namespace System::String, on that website we can find example code.

 

Regards

Jesse

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Answer 3

Thanks for your replies.

 

I have created the class  with the vectors as members.

Where should I declare an instance of this class for it to be accessible to a button click event handler that does the file opening that I then read to store content in the vectors? This is a forms application on visual studio 2005.

 

Thanks Jesse, I'll try get the split to get the values between the commas, I have used it in VB.NET but it looks like everything is difficult with c++.

 

Regards,

 

Mugu

Answer 4

You don't need a separate class.  What class are the button click handlers in?  That's the class that should have the vector as a member so the button handlers can access it.

 

Answer 5

Create the vector variable as a member of the class that represents the form.

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«_Superman_»
Microsoft MVP (Visual C++)

Answer 6

Thanks,to some extent I'm understanding what you are saying. I have added the vector as a member variable of the form class which has the open file button that will need to populate the vector.

 

However, I have  no clue how to initialize the vector when it is a member of class managed in c++, so I get a null object reference when I push back some data to the vector.I should ideally be doing this int the initializeComponent function, but don't know how. The managed stuff is causing my grief.

 

Thanks,

Mugu

Answer 7

Since you're using C++/CLI you could use the array class - array<array<double>^>^ doublearray

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«_Superman_»
Microsoft MVP (Visual C++)