StreamReader delimiter in C++/CLI

[File.Not.Found]

Hello to everybody, I am new to CodeGuru. I was wondering if anybody could give me a hand.

How can I specify delimiters for StreamReader so that it reads each single line from a csv file and then assigns each item between commas to a string of an array? I would like to achieve the same effect of the code below that I previously wrote in C++ and that was working fine (each line is read up to the 3rd item).

Any advice is welcome!

string Cell[100];
int i = 0;
ifstream INPUT ("INPUT.csv");
while (! INPUT.eof())
{
if ((i + 1) % 3 == 0) getline(INPUT, Cell[i++]);
else getline(INPUT, Cell[i++], '\,');

[darwen]

StreamReader in itself won't do it, but combined with the Split method on System::String you should be able to do it easily

e.g.


// no '^' or gcnew : when this goes out of scope it'll be disposed.
StreamReader reader("c:\\mytestfile.txt", FileMode::Open);

String ^line = reader.ReadLine();

while (line != nullptr)
{
array<String ^> ^parts = line->Split(',');
// deal with array here

line = reader.ReadLine();
}


Darwen.

[File.Not.Found]

Hi Darwen,

Thank you so much for your advice. I've tried as you suggest but I get this error:

Error 2 error C2664: 'System::IO::StreamReader::StreamReader(System::IO::Stream ^,bool)' : cannot convert parameter 1 from 'const char [11]' to 'System::IO::Stream ^'


This is my revised code:

StreamReader reader("INPUT3.csv", FileMode::Open);
String ^line = reader.ReadLine();

while (line != nullptr)
{
array<String^> ^cell = line->Split(',');
// deal with array here
int i = 0;
line = reader.ReadLine();

String^ StrValue0 = cell[i];
String^ StrValue1 = cell[i++];
String^ StrValue2 = cell[i++];

double Value0 = double:: Parse( StrValue0 );
textBoxPROVA->Text= Value0.ToString("N0");

double Value1 = double:: Parse( StrValue1 );
textBoxpostkf->Text= Value1.ToString("N0");

double Value2 = double:: Parse( StrValue2 );
textBoxpreks->Text= Value2.ToString("N0");

}

Thank you!

[darwen]

Try this instead -


StreamReader reader("INPUT3.csv");
String ^line = reader.ReadLine();

while (line != nullptr)
{


Darwen.

[File.Not.Found]

That's wonderful, thank you so much, now it works! The only problem is that

String ^line = reader.ReadLine();

reads all the lines present but keeps in memory only the last one. What I would need is a command to stop ReadLine() at the end of each line, so that I can return each substring.

[File.Not.Found]

Hi Darwen,
I really appreciated your previous reply. I was wondering if you had any advice on how to stop reader.ReadLine() at the end of each line, rather than at the end of the array I created (please see my last post). Many thanks in advance.