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  • File Read

    千次阅读 2012-11-28 15:05:04
    Write char to a file #include #include using namespace std; int main(int argc, char *argv[]) { char ch; if(argc!=2) { cout \n"; return 1; } ofstream out(argv[1], ios::out | ios

    Write char to a file

    #include <iostream>
    #include <fstream>
    using namespace std;
    
    int main(int argc, char *argv[])
    {
      char ch;
    
      if(argc!=2) {
        cout << "Usage: WRITE <filename>\n";
        return 1;
      }
    
      ofstream out(argv[1], ios::out | ios::binary);
    
      if(!out) {
        cout << "Cannot open file.\n";
        return 1;
      }
    
      cout << "Enter a $ to stop\n";
      do {
        cout << ": ";
        cin.get(ch);
        out.put(ch);
      } while (ch!='$');
    
      out.close();
    
      return 0;
    }

    Read file content

    #include <iostream>
    #include <fstream>
    using namespace std;
    
    int main()
    {
      ifstream in("test", ios::in | ios::binary);
    
      if(!in) {
        cout << "Cannot open input file.\n";
        return 1;
      }
    
      double num;
      char str[80];
    
      in.read((char *) &num, sizeof(double));
      in.read(str, 14);
      str[14] = '\0'; // null terminate str
    
      cout << num << ' ' << str;
    
      in.close();
    
      return 0;
    }

    Use getline() to read a string that contains spaces.

    #include <iostream>
    #include <fstream>
    using namespace std;
    
    int main()
    { 
      char str[80];
    
      cout << "Enter your name: ";
      cin.getline(str, 79);
    
      cout << str << '\n';
    
      return 0;
    }
    

    Demonstrate peek() in ifstream

    #include <iostream>
    #include <fstream>
    #include <cctype>
    using namespace std;
    
    int main()
    { 
      char ch;
      ofstream out("test", ios::out | ios::binary);
    
      if(!out) {
        cout << "Cannot open output file.\n";
        return 1;
      }
    
      char str[80], *p;
     
      out << 123 << "this is a test" << 23;
      out << "Hello there!" << 99 << "sdf" << endl;
      out.close();
      
      ifstream in("test", ios::in | ios::binary);
    
      if(!in) {
        cout << "Cannot open input file.\n";
        return 1;
      }
    
      do {
        p = str;
        ch = in.peek();                    
        if(isdigit(ch)) {
          while(isdigit(*p=in.get())) 
             p++; 
          in.putback(*p); 
          *p = '\0';                        
          cout << "Integer: " << atoi(str);
        }
        else if(isalpha(ch)) {              
          while(isalpha(*p=in.get())) p++;
          in.putback(*p);                   
          *p = '\0';                        
          cout << "String: " << str;
        }
        else 
          in.get();                        
        cout << '\n';
      } while(!in.eof());
      
      in.close();
      return 0;
    }


    展开全文
  • hehe=FileRead(File,Tmp2,sizeof(struct student)); hehe 的定义为整型,但这个函数具体返回的是什么?
  • python 示例 文件read()方法 (File read() Method) read() method is an inbuilt method in Python, it is used to read the content of the file, by using this method we can read the specified number of bytes...

    python 示例

    文件read()方法 (File read() Method)

    read() method is an inbuilt method in Python, it is used to read the content of the file, by using this method we can read the specified number of bytes from the file or content of the whole file.

    read()方法是Python中的内置方法,用于读取文件的内容,通过使用此方法,我们可以从文件或整个文件的内容中读取指定数目的字节。

    Syntax:

    句法:

        file_object.read(size)
    
    

    Parameter(s):

    参数:

    • size – It is an optional parameter, it specifies the number of bytes to be read from the file. It's default value is -1 that returns the content of the whole file.

      size –这是一个可选参数,它指定要从文件读取的字节数。 它的默认值是-1 ,它返回整个文件的内容。

    Return value:

    返回值:

    The return type of this method is <class 'str'>, it returns the string i.e. file's content (if the file is in text mode).

    此方法的返回类型为<class'str'> ,它返回字符串,即文件的内容(如果文件处于文本模式)。

    Example:

    例:

    # Python File read() Method with Example
    
    # creating a file 
    myfile = open("hello.txt", "w")
    # wrting text to the file
    myfile.write("C++ is a popular programming language.")
    # closing the file
    myfile.close()
    
    # reading the file i.e. opening file in read mode
    myfile = open("hello.txt", "r")
    # reading & printing the whole file 
    # Here, we are not specifying the size
    print("myfile.read()...")
    print(myfile.read())
    
    # reset the position 
    myfile.seek(0)
    
    # reading 10 bytes and printing
    print("myfile.read(10)...")
    print(myfile.read(10))
    
    # reset the position 
    myfile.seek(0)
    
    # reading whole file by passing -1
    print("myfile.read(-1)...")
    print(myfile.read(-1))
    
    # closing the file
    myfile.close()
    
    

    Output

    输出量

    myfile.read()...
    C++ is a popular programming language.
    myfile.read(10)...
    C++ is a p
    myfile.read(-1)...
    C++ is a popular programming language.
    
    
    

    翻译自: https://www.includehelp.com/python/file-read-method-with-example.aspx

    python 示例

    展开全文
  • source insight,Error:File read error

    千次阅读 2019-04-15 11:09:05
    Look Reference...,后, 弹出windows,显示Error:File read error。 2、解决方案 首先可以使用Project-->Synchronize Files 如果还是不行,可以使用Project-->Rebuild Project ...

    1、现象

    当需要搜索特定关键字时候,search-->Look Reference...,后, 弹出windows,显示Error:File read error。

    2、解决方案

    首先可以使用Project-->Synchronize Files

    如果还是不行,可以使用Project-->Rebuild Project

     

    展开全文
  • Source Insight 3 出现错误:Error:File read error 解决办法: 1、点击菜单:Project->Synchronize File... 2、若果还是出现 Error:File read error错误  点击菜单:Project->Rebuild Project...
    Source Insight 3 出现错误:Error:File read error

    解决办法:

    1、点击菜单:Project->Synchronize File...

    2、若果还是出现 Error:File read error错误

          点击菜单:Project->Rebuild Project...

    展开全文
  • 一,在linux上用zip:zip -r www.zip www/压缩... zip I/O error: No such file or directory zip error: Input file read failure (was zipping www/WEB-INF/SHEETUPLOAD/20170109/1483928803178uid518.JPG) 原因
  • source insight,Error:File read error问题

    千次阅读 2015-04-22 14:14:26
    当需要搜索特定关键字时候,search-->Look Reference...,后, 弹出windows,显示Error:File read error。只需要重新 (synchronize files...)【Project-->synchronize files...】,即可。
  • Python file read()方法

    千次阅读 2019-07-26 11:53:21
    Python文件方法read()介绍、使用示例和注意事项。
  • 使用file.read()读取文件。 使用file.readline()读取文件的一行相关信息。 使用file.write()进行写入文件。 使用file.writelines(seq)向文件写入字符串序列seq。 使用file.close()关闭文件。 使用file.tell()...
  • 2019-08-28T06:35:11.449650Z 0 [ERROR] InnoDB: Database page corruption on disk or a failed file read of page [page id: space=7558, page number=1561]. You may have to recover from a backup. ...
  • FUNCTION fileread,file ;file = DIALOG_PICKFILE(FILTER='*.*');也可以省略 ;2010-08-28 ;wxp07@qq.com LineCount = FILE_LINES(file); if (LineCount gt 0) then begin StringArray = strarr(LineCount)
  • 参考:https://stackoverflow.com/questions/519633/lazy-method-for-reading-big-file-in-python ...file.readlines() takes in an optional size argument which approximates the number of lines read in the...
  • 使用fileread将img转化为base64

    千次阅读 2017-07-15 18:16:35
    var file = document.getElementById('file').files[0]; console.log(file.type); //判断type的类别。是否是img并且判断浏览器是否支持filereader //if (file.type="") { console.log(file.type...
  • Additional Security Information For Microsoft WindowsHow to Secure a Password File on Microsoft Windows Systemssee: http://java.sun.com/javase/6/docs/technotes/guides/management/security-win
  • python read file

    千次阅读 2019-06-15 11:28:26
    python read file #python def main(): # read one time with open('files/11.data.txt', 'r') as f: print f.read() # read by for-in with open('files/11.data.txt', 'r') as f: ...
  • FileStream Read File

    千次阅读 2012-04-19 13:08:24
    http://www.csharp-examples.net/filestream-read-file/ FileStream Read File [C#] ...This example shows how to safely read file using FileStream in C#. To be sure the whole file is correctly read,
  • db file sequential read

    千次阅读 2009-11-06 17:35:00
    db file sequential readdb file sequential read等待事件有3个参数:file#,first block#,和block数量。在10g中,这等待事件受到用户I/O等待级别的影响。当处理db file sequential read等待事件的时候,牢记以下...
  • db file scattered read

    千次阅读 2013-12-30 17:46:43
    db file scattered read The db file scattered read wait event has three parameters: file#, first block#, and block count. In Oracle Database 10g, this wait event falls under the User I/O wait ...
  • 使用Python处理文件内容时,遇到了一个小问题。 例如,我打开一个文件,读其中的内容是否为零: ...这里的file内容确实是0,但是file.read() == "0"是 False!? WHY? 可能1: python的read()函数是从...
  • 数据驱动RIDE提供的库: Create List Get File Import Variables Template ExcelLibrary 自定义库:DataCenter.py Read Data From Excel Read Excel File Read CSV File Read Column From Excel
  • 数据驱动RIDE提供的库: Create List Get File Import Variables Template ExcelLibrary 自定义库:DataCenter.py Read Data From Excel Read Excel File Read CSV File Read Column From Excel
  • SoInput Read file

    千次阅读 2011-06-24 15:09:00
    /*----------------------------------------------------------- * Example of reading from a file. * Read a file given a filename and return a separator * containing all of the file. Return NUL
  • db file sequential read等待事件

    万次阅读 2013-10-01 23:33:03
    最近某个应用的AWR中总显示“db file sequential read“等待事件位于top 5之首,下面检索下MOS关于这个等待事件的说明。 等待事件: "db file sequential read" Reference Note (文档 ID 34559.1)  这种等待事件是...
  • db file sequential read 详解

    千次阅读 2015-06-12 15:48:45
      db file sequential read 事件有三个参数:file#,first block#, block count, 在oracle 10g里,此等待事件在归于 User I/O wait class 下面的. 处理db file sequential read 事件要牢牢把...
  • Java read file

    千次阅读 2009-07-12 20:07:00
    This code will read the MyFile.txt and print its content on theconsole. It reads the file line by line in the form of DataInputStream. package MyProjectimport java.i
  • 等待事件 db file sequential read

    万次阅读 2018-05-31 16:28:03
    db file sequential read-数据文件顺序读取  等待事件: "db file sequential read" Reference Note (文档 ID 34559.1)  这种等待事件是一种IO读请求相关的等待。与”db file scat...
  • 详解 db file sequential read 等待事件

    万次阅读 2015-02-28 20:14:43
    db file sequential read (本文由thomaswoo_dba翻译,转载请注明出处) db file sequential read 事件有三个参数:file#,first block#, block count, 在oracle 10g里,此等待事件在归于 User I/O wait class 下面的. ...

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