sample cobol program to read and write file

mode of reading and writing files: Copy Code code as follows: R-Read mode W-write mode (overwrite existing content) A-attach mode (after existing content is attached) B-Binary mode r+-Read update mode (existing data retention) w+-Write update mode (existing data erasure) A +-Additional update m

The code is as follows Copy Code IsolatedStorageFile myisolatedstorage = Isolatedstoragefile.getuserstoreforapplication ();If it is a replication file, then it is best to delete the file before writing, otherwise, if the file size is written, less than the size of the file itself, then the data of the p

C ++ read/write file stream instance program description This article describes how to read and write file stream instances in c ++. Methods for reading and writing text files

data output stream object3) write the data of the binary file using the method of the data output stream classOut.write (1);//writes the specified byte data to the binary file4) Turn off the data output streamOut.close ();C. Write a Java program to read the Win.ini

PHP program in the file lock, mutex, read and write the use of skills analysis, File lockFull name advisory file lock, which is mentioned in the book. This type of lock is more common, such as MySQL, after php-fpm boot, there wil

This article mainly introduced in the Python program for file reading and writing operations tutorial, is the basic knowledge of Python learning, the need for friends can refer to the Reading and writing files is the most common IO operation. Python has built-in functions for reading and writing files, and the usage is compatible with C. Before reading and writing files, we must first understand that the

Below we use several examples to summarize the use of the php fopen function to implement file read and write operations. If you need to learn, refer. Simple reference to fopen Functions The fopen () function opens a file or URL. If opening fails, this function returns FALSE. SyntaxFopen (filename, mode, include_path,

How to master the reading and writing of text filesLearn how to read and write binary files C + + file Flow: Copy Code code as follows: FStream//File Flow Ifstream//input file stream Ofstream//Output file strea

""; } Catch { return ""; } } Public Static voidSetconfigvalue (stringAppKey,stringappvalue) {XmlDocument XDoc=NewXmlDocument (); Xdoc.load (System.Windows.Forms.Application.ExecutablePath+". config"); XmlNode XNode; XmlElement xElem1; XmlElement xElem2; XNode= Xdoc.selectsinglenode ("//appsettings"); XElem1= (XmlElement) Xnode.selectsinglenode ("//add[@key = '"+ AppKey +"']"); if(XElem1! =NULL) Xelem1.setattrib