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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++ program to create a temporary file
// read and write to a temporary file.
#include <cstdio>
#include <cstdlib>
#include <iostream>

using namespace std;

// Driver code
int 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

C++ Program to Create a Temporary File

I
ishankhandelwals
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