如何将long数据类型转换为int [英] how to convert long datatype into int

问题描述

你好，先生，这是我的代码;

当我运行此函数时出现错误无法从long转换为int。

  public   byte  [] readfile（ string  FPath）
 {
  byte  [] data =  null ; 
 尝试 
 {
 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））; 
 
  //  上面的行错误就像;  
 < span class =code-comment> //  错误3参数1：无法从'long'转换为'int' 
 
 fstream.Close（）; 
} 
  catch （Exception ex）
 {
 MessageBox.Show（ex.Message.ToString（））; 
 
} 
 返回数据; 
} 

先生告诉我怎么做

解决方案

< blockquote>实际上你得到了那个错误，因为BinaryReader.ReadBytes方法接受参数作为整数，并且你要传递很长时间。



所以你可以改变这样的代码。 ..



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



将解决您的问题

使用WriteByte代替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（））; 
 
} 
返回数据; 
} 

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

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

解决方案

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

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;
}

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