How to use tempfile() in C
The tmpfile() function in C creates a temporary file that is automatically deleted when the program terminates.
The created file opens in binary update (wb+) mode.
To use the tmpfile() function, the program needs to include the stdio.h header file as shown below:
#include <stdio.h>
Parameters and Return Value
The tmpfile() function accepts no parameters.
tmpfile() returns a pointer to the file upon its successful creation, otherwise it returns NULL.
Examples
The following code demonstrates how to create a temporary file, read from it, and write to a temporary file:
#include <stdio.h>int main(){FILE* ptr;ptr = tmpfile();char input[] = "Educative.io";int i = 0;//checks for successful creation of fileif(ptr == NULL){printf("The file pointer is NULL");return 0;}else{printf("The file has been created\n");}while(input[i] != '\0'){//writes to filefputc(input[i] , ptr);i++;}//positions pointer at the start of filerewind(ptr);// check for end of filewhile(!feof(ptr)){//reads from fileprintf("%c",fgetc(ptr));}}
Explanation
- In the above example, a temporary file is created and stored in the pointer
ptr - The program checks
ptrforNULLvalue to detect unsuccessful creation of the file - The
fputc()function writes one character of “Educative.io” to the file at a time until the end of the string is reached - The
fgetc()function reads one character at a time until the end of the file is reached as identified byfeof()
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