sample cobol program to read and write file

File Operation example Copy codeThe Code is as follows:# Input fileF = open (r 'd: \ Python27 \ pro \ 123. bak ')# Output fileFw = open (r 'd: \ Python27 \ pro \ 123e. bak ', 'w ')# Read all text by lineLines = f. readlines ()Num =-1For line in lines:Str = '@ SES/% I/' % numLine = line. replace ('@ SES/1/', str)Num = num + 1# Writing filesFw. writelines (line)# Close the

means that you must open a file using flock. $operation is the type of operation. $wouldblock If the lock is blocked, the variable is set to 1. Note that this function is blocked by default, and a bitmask lock_nb can be added to the operation if you want to be non-blocking. Next Test. $pid _file = "/tmp/process.pid"; $pid = Posix_getpid (); $fp = fopen ($pid _file, ' w+ '); if (Flock ($fp, LOCK_EX | LOCK_NB)) { echo "got the loc

, PHP writes to files as well: Open files, write data, and close files. The method for opening and closing a file is described above. What about writing data to a file in PHP? Use the fwrite () function, such as fwrite (file path, write content): The code is

Simple reference to fopen functionsThe fopen () function opens a file or URL.If opening fails, this function returns FALSE.SyntaxFopen (filename, mode, include_path, context)Instance 1Example of creating a file: The code is as follows:Copy code If (! File_exists ("test.txt") {// if the file does not exist (the default value is in the current directo

I. file read/write As mentioned above, stream reads and writes mainly include C ++ code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

We want to implement a file read and write operation of a small programFirst we have a fileWe want to "============" as the boundary, each role is divided into a separate TXT file, according to the split line is divided intoXiaona_1.txt Xiaobing_1.txtXiaona_2.txt Xiaobing_2.txtFour files in such a formatThe following c

Introduction: TitleImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;/** * @authorCzchina **/ Public classTeststream { Public Static voidMain (string[] args) {FileInputStream FLs=NULL; FileOutputStream Fos=NULL; Try{FLS=NewFileInputStream ("E:/android/androidstudioprojects/text.txt"); FOS=NewFileOutputStream ("E:/android/androidstudioprojects/store.txt"); //generating a byte array byte[] buffer=New byte[500]; intnum = 0; intTMP = 0; intTMP1 = 0; for(inti=0;i) {tmp= Fls.rea

This article mainly introduces C + + read-write file flow examples, we refer to the use of the bar Mastering the methods of reading and writing text files understanding the methods of reading and writing binaries nbsp; C + + file streams: nbsp; nbsp; Replication code code is as follows: FStream//

The main recent learning Python, two exercises of small examples, also read the written, very simple, feel a little useWrite File **********#_ *_ Coding:utf-8 _*_Import OSls = os.linesepWhile True:fname = raw_input (' input filename: ')If Os.path.exists (fname):Print "ERROR: '%s ' already exists"% fnameElseBreakall = []While True:Entry = raw_input (' Please enter content and end with. ')If entry = = '. ':Br

, there is no problem with the implicit conversion. The code is as follows Copy Code 1 # CODING=GBK23 s = U ' Chinese '4 Print S.encode (' GBK ') File Read and Write --------------------------------------------------------------------------------Only ASCII or GBK encoded file

　　Main content:1. Initial file operation2. Read-only (R,RB)3. Write only (W,WB)4. Append (A, AB)5. Read and write (r+)6. Write-read (w+)7. Additional

(). toString (). Trim ());Edit1.settext ("");}});Read.setonclicklistener (New Onclicklistener () { @Overridepublic void OnClick (View v) {Edit2.settext (read ());}});}private void Write (String content) {try {if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {Get the directory of the SD cardFile Sdcarddir = Environment.getexternalstoragedirectory ();

; }/** * Write, read sdcard directory files, to use FileOutputStream, can not be used Openfileoutput * different points: Openfileoutput is compiled in raw, Fileoutputstrea M is any file can be * @param fileName * @param message *///////write the file under the/mnt/sdcard/dir

First, the conclusion:File r+ Open:1. Write () cannot implement insert write, it always overwrites write or append write;2. If the file is open as write (), overwrite the write from the

———————————————————————————————————————————Read and write a string from a file (read/write directly/through Nsurl)#import int main (int argc, const char * argv[]) {@autoreleasepool {Writes a string directly to a file *************

C language file read and write operations, write data to files, read and write It is very time for beginners to learn how to read and write

Linux using IIC Bus Read and write I2C from device registers by Handavei @ Jilin Normal University handawei@jusontech.com reproduced please be sure to indicate the source ******************* ******* 2012.7.16 1, this paper gives the implementation program of I2C from device using IIC bus under Linux. 2, this paper gives some very hidden error solutions in program

Large file read/write methods, file read/write Methods Import java. io. *; class Test {public static void main (String args []) {FileInputStream FD = null; FileOutputStream fos = null; try {FD = new FileInputStream ("F: /Android/J

# Region: determines whether a file exists. If the file does not exist, it is created. Otherwise, the read value is displayed in the form. PublicFormmain () { Initializecomponent (); // Readfile (application. startuppath + "// alarmset.txt "); // Determine whether a file exists // System. Io. directoryinfo

() Use examples: char ch; FILE *FP = fopen ("D:\\demo.txt", "r+"); ch = fgetc (FP); Represents reading a character from the D:\\demo.txt file and saving it to the variable ch. There is a position pointer inside the file to point to the current read-write locat