Using string operations to save part of a file path

I need to get the filename out of a full path name and am getting unexpected output and a fault.

I am compiling the code on Visual C++ .NET.

The code for this function is as follows:

Code:

---

virtual void fileSelected(const char *n) {
                string name = n;  //copy file path
                int startName = 0;  //initialize position where filename starts
                int endName = 0; //initialize position where the filename ends
                string filename; //stores filename without path or extension

                editor->getSceneGraph()->saveFile(n);
              editor->setLoadedFileName(n);

                ofstream a_file ( "file.txt" ); //open file
               
                for (int i = 0; i < name.length(); i++)  //iterate through given path to find where filename begins and ends
                {
                        if (name[i]= '/')
                                startName= i;
                        if(name[i] = '.')
                                endName = i;
                }

                startName= startName+1; //filename actually starts immediately after the last '/'

                //filename = name.substr(startName+1,name.length()-endName); //get filename from name  <---FAULTS HERE
               
                //save information to file
                a_file << filename << endl;  //the filename that I need
                a_file<< n << endl;  //path input to function
                a_file << name << endl; //string that is copied from path
                a_file<< startName << endl; //where the filename starts in the path
                a_file<< name.substr(name.length()-4, 4)<<endl; //file extension
                a_file.close();
    }

---

If the path is C:\ProgramFiles\test.doc, the output should be:

C:\ProgramFiles\test.doc
C:\ProgramFiles\test.doc
17
.doc

I am getting:

C:\Program Files\test.doc
.........................
25
....

Also, when I un-comment the line

Code:

---

filename = name.substr(startName+1,name.length()-endName); //get filename from name

---

I get the Microsoft Development Environment error "Unhandled exception at 0x7c812a5b in Interactive Architecture.exe: Microsoft C++ exception: std::out_of_range @ 0x0012ee60."

Does anyone know what might be causing my problems and have any suggestions?

Thank you,
JackR

>> if (name[i]= '/')
To start off with, you probably didn't want assignment there and in the next if.

I do not understand what you mean.

The first if statement is to find '/' the second if statement is to find '.'.

Would you please clarify?

Thanks again,
JackR

You are testing equality. A single = means assignment. You want ==.

Oh. Thanks for the catch. That fixed everything.

JackR