how to convert long datatype into int

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hello sir here is my code;
when i run this function there is error "cannot convert from long to int."

C#

public byte[] readfile(string FPath)
        {
            byte[] data = null;
            try
            {
                FileInfo FI = new FileInfo(FPath);

                long numbytes = FI.Length; // 

                FileStream fstream = new FileStream(FPath, FileMode.Open, FileAccess.Read);
                BinaryReader br = new BinaryReader(fstream);
                //data = br.ReadBytes(Convert.ToInt64(numbytes));

                data = br.ReadBytes(Convert.ToInt64(numbytes));   

//At above line error comes like;
//Error	3	Argument 1: cannot convert from 'long' to 'int'

   fstream.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());

            }
            return data;
        }

sir tell me how to do this

Posted 25-Aug-14 18:12pm

Harjesh

Updated 25-Aug-14 18:40pm

VICK

v3

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2 solutions

Solution 2

Use "WriteByte" instead of "WriteBytes":

public byte[] readfile(string FPath)
{
    byte[] data = null;
    try
    {
        FileInfo FI = new FileInfo(FPath);

        long numbytes = FI.Length; // 

        FileStream fstream = new FileStream(FPath, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fstream);

        MemoryStream ms = new MemoryStream();

        for (long i = 0; i < numbytes; i++)
        {
            ms.WriteByte(br.ReadByte());
        }

        ms.Close();
        fstream.Close();

        data = ms.ToArray();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message.ToString());

    }
    return data;
}

Posted 25-Aug-14 19:57pm

vikinghunter

Updated 25-Aug-14 20:32pm

v2

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Tejas Vaishnav · Accepted Answer · 2014-08-25T18:26:00

Solution 1

Actually you got that error because BinaryReader.ReadBytes method is accepting argument as integer, and you are passing long into it.

so you can change code like this...

data = br.ReadBytes(Convert.ToInt32(numbytes));

will resolve your issue

Posted 25-Aug-14 18:26pm

Tejas Vaishnav

Comments

vikinghunter 26-Aug-14 1:59am

Will not "FI.length > int.MaxValue" happen?