C++ Program to Create a Temporary File
Last Updated :
31 Jul, 2022
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Here, we will see how to create a temporary file using a C++ program. Temporary file in C++ can be created using the tmpfile() method defined in the <cstdio> header file. The temporary file created has a unique auto-generated filename. The file created is opened in binary mode and has access mode “wb+”. These temporary files are automatically deleted when the program is terminated or when they are closed in the program using fclose().
Syntax:
std::FILE* tmpfile();
Return value: The associated file stream or a null pointer if an error has occurred.
Below is the C++ program to create a temporary file, writing in and reading from the temporary file:
- C++
C++
// C++ program to create a temporary file// read and write to a temporary file.#include <cstdio>#include <cstdlib>#include <iostream>using namespace std;// Driver codeint main(){ // Creating a file pointer which // points to the temporary file // created by tmpfile() method FILE* fp = tmpfile(); // Content to be written in temporary file char write[] = "Welcome to Geeks For Geeks"; // If file pointer is NULL there is // error in creating the file if (fp == NULL) { perror("Error creating temporary file"); exit(1); } // Writing in temporary file the content fputs(write, fp); rewind(fp); // Reading content from temporary file // and displaying it char read[100]; fgets(read, sizeof(read), fp); cout << read; // Closing the file. Temporary file will // also be deleted here fclose(fp); return 0;} |
Output:
Welcome to Geeks For Geeks
