C language file operation: How to deal with temporary files?

C language file operation: processing temporary files

A temporary file is a temporary file used to store temporary data. In some cases, this is very useful when you need to store some data that needs to be deleted later.

In C, you can use tmpfile() function to create temporary files. This function returns a FILE pointer to a temporary file, which will be automatically deleted when the program exits.

For example, the following code creates a temporary file and writes some data:

 #include <stdio.h>
#include <stdlib.h>

int main() {
    FILE *fp;
    fp = tmpfile();
    if (fp == NULL) {
        perror("tmpfile()");
        exit(EXIT_FAILURE);
    }

    // Write data to the temporary file fprintf(fp, "Hello, world!\n");
    fclose(fp);
    return 0;
}

It should be noted that the file name created by tmpfile() is private and you cannot use standard I/O functions to open it. If you need to access the name of the temporary file, you can use tmpnam() function. This function returns a string containing the name of the temporary file.

For example, the following code uses tmpnam() to get the name of the temporary file and print it to standard output:

 #include <stdio.h>
#include <stdlib.h>

int main() {
    char *filename;
    filename = tmpnam();
    if (filename == NULL) {
        perror("tmpnam()");
        exit(EXIT_FAILURE);
    }

    // Print the temporary file name printf("temporary file name: %s\n", filename);
    return 0;
}

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