Get File Size Of File In Windows C Code Example

Example 1: how to check the size of a file c

If you have the file stream (FILE * f):  fseek(f, 0, SEEK_END); // seek to end of file size = ftell(f); // get current file pointer fseek(f, 0, SEEK_SET); // seek back to beginning of file // proceed with allocating memory and reading the file  Or,  #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> fd = fileno(f);  struct stat buf; fstat(fd, &buf); int size = buf.st_size;  Or, use stat, if you know the filename:  #include <sys/stat.h> struct stat st; stat(filename, &st); size = st.st_size;

Example 2: size of file in c

// C program to find the size of file  #include <stdio.h>   long int findSize(char file_name[])  {  	// opening the file in read mode  	FILE* fp = fopen(file_name, "r");   	// checking if the file exist or not  	if (fp == NULL) {  		printf("File Not Found!\n");  		return -1;  	}   	fseek(fp, 0L, SEEK_END);   	// calculating the size of the file  	long int res = ftell(fp);   	// closing the file  	fclose(fp);   	return res;  }   // Driver code  int main()  {  	char file_name[] = { "a.txt" };  	long int res = findSize(file_name);  	if (res != -1)  		printf("Size of the file is %ld bytes \n", res);  	return 0;  }