3/4/2023 0 Comments Readwrite file![]() ![]() Text files manipulation routines are important for everyday computer usage. Furthermore, we showed you how to read and write data into both text files and binary files.How can I read a text file in a C++ app? How can I write to a text file in C++? How can I append to a text file in C++? How can I use open() method for the ifstream? How can I use open() method for the ofstream? How can I use open() method for the fstream? What is the syntax of ofstream open()? What is the syntax of ifstream open()? What is the syntax of fstream open()? How can I write and read to a text file using the latest C++ syntax? In this article, we showed you how to use various file operations with the C++ programming language by working through several examples. emp_id << endl įiles are mainly used to store the data, and they play an important role in real-world programming. read ( ( char * ) &empObj_R, sizeof (Employee ) ) Ĭout << "Error occured during reading the binary file!" << endl Ĭout << "Details of the Employee : " << endl Ĭout << "Employee ID : " << empObj_R. open ( "Employee.dat", ios :: in | ios :: binary ) īinInFile_Handler. write ( ( char * ) &empObj_W, sizeof (Employee ) ) Ĭout << "Error occured during writing the binary file!" << endl īinInFile_Handler. open ( "Employee.dat", ios :: out | ios :: binary ) īinOutFile_Handler. Then, we will read the binary file and print the output to the monitor.īinOutFile_Handler. To simplify this example, we have declared the Employee class with a public variable emp_id. In this example, we are going to declare a class and then write the object to a binary file. Now, we will compile and execute the program.Įxample 5: Read and Write to a Binary File While ( getline (myFile_Handler, myLine ) ) open ( "File_1.txt", ios :: in | ios :: out ) Then, we read the data from the file and print it to the monitor. ![]() In this example, we first write some content to the file. To both read and write to a file, we have to get an fstream object and open the file in “ios::in” and “ios::out” mode. In C++, we can also read and write to a file at the same time. So far, we have showed you how to open, read, write, and close a file. Therefore, we have successfully read the file and printed the content of the file to the monitor. ![]() Once we compile and execute the program, it is clear that the output matches the content of the file. Now, we will print the content of File_1.txt using the following command: cat File_1.txt. While (getline (myFile_Handler, myLine ) ) We can then use the open() function to create an empty file and the close() function to close the file. We have declared a myFile_Handler as an object of ofstream inside the main function. We have included the fstream header file at line number-1 so that we can access ofstream class. Then, to read or write to a file, we have to open the file. To open and close a file, we need an object of ofstream. As you can see in the below program, we have included the library required for file operations. In this example program, we will demonstrate how to open/create a file and how to close the file in C++.
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