{Text to PCL} I have to print a text file using PCL5 in C language by applying fonts over it. Can u please help me out over this ?

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C

Hi,
I am a student working on a project based on PCL5 .
Trying to develop a program which will be providing text file printing functionality to the printer.
The driver will be implemented on C language.
I have implemented the PCL5 commands in the C program given below.
Now i want to change the font of the text file but it is not getting changed.
Please help and suggest to find out where i committed the mistake and let me know if the commands are correct for text file printing or not ?
Here is the code for text to PCL on which i am working on

What I have tried:

#include <stdio.h>
#include<conio.h>

typedef struct text {
	unsigned char data[100],
	coloumn,
	count_lines;
}TEXT;

struct text detail;

int main()
{
	int Esc = 27;
	int totalchar;
	unsigned char cPCLLineData[128];
	
	char cGraphicsBegin[] = { 27, '&', 'a', '0', 'C', 27, '&', 'a', '0', 'R', 27, '(', '1', '2', 'U' };
	char cRowHeader[] = { 27, '*', 's', '3', 'I' };
	char cGraphicEnd[] = { 27, '*', 'c', '8', '3', 'E' };
	FILE *fptr1, *fptr2;
	char filename[100], c;

	printf("Enter the filename to open for reading \n");
	scanf("%s", filename);

	// Open one file for reading
	fptr1 = fopen(filename, "r");
	if (fptr1 == NULL)
	{
		printf("Cannot open file %s \n", filename);
		exit(0);
	}

	printf("Enter the filename to open for writing \n");
	scanf("%s", filename);

	// Open another file for writing
	fptr2 = fopen(filename, "w");
	if (fptr2 == NULL)
	{
		printf("Cannot open file %s \n", filename);
		exit(0);
	}
	fwrite(&cGraphicsBegin, sizeof(cGraphicsBegin), 1, fptr2); /* Creating PCl file header */
	{
	// Read contents from file
	c = fgetc(fptr1);
	while (c != EOF)
	{
		fputc(c, fptr2);
		c = fgetc(fptr1);
	}
	int u32ColCounter = 0;
	for (int rowCounter = 0; rowCounter <= (detail.coloumn - 1); rowCounter++)
	{
		/* Adding the data for single row */
		for (int Coloumncounter = 0; Coloumncounter <= detail.count_lines; Coloumncounter++)
		{
			fwrite(&cGraphicEnd, sizeof(cGraphicEnd), 1, fptr2);
		}
	}
	fwrite(&cRowHeader, sizeof(cRowHeader), 1, fptr2);/* adding a header per row */
	fwrite(&cPCLLineData, detail.coloumn, 1, fptr2); /* adding a header per row */
	}
	fwrite(&cGraphicEnd, sizeof(cGraphicEnd), 1, fptr2);/* Creating PCl file footer */
	
	printf("\nContents copied to %s", filename);

	fclose(fptr1);
	fclose(fptr2);
	return 0;
}