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Code: Select all

#include <stdio.h>

int main()
{
	FILE* fptr;

	int operatingsystem;

	/* Open bin file */
	fopen_s(&fptr, "C:\\Users\\bubba2533\\Projects\\LS1 Boost OS V3\\12587603.bin", "rb");
	if (fptr == NULL) {
		return 3;
	}

	/* Seek to OS and read value*/
	fseek(fptr, 0x504, SEEK_SET);
	size_t elements_read = fread_s(&operatingsystem, sizeof(operatingsystem), sizeof(operatingsystem), 1, fptr);
	if (elements_read == 0) {
		return 4;
	}

	printf("Operating system of file: %u\n", operatingsystem);

	fclose(fptr);

	return 0;
}

Code: Select all

#include <stdio.h>

int main()
{
    FILE* fptr;

    unsigned long operatingsystem; // OsID is 4 bytes.
    char buffer[4];                // char buffer, makes handling BE simple.

    // Open bin file
    fopen_s(&fptr, "12587603.bin", "rb");
    if (fptr == NULL) {
        return 3;
    }

    // Seek to OS and read value
    fseek(fptr, 0x504, SEEK_SET);
    size_t elements_read = fread_s(&buffer, sizeof(buffer), sizeof(buffer), 1, fptr); //Changed to use buffer
    if (elements_read == 0) {
        return 4;
    }

    // Bit shift everything into unsigned long.
    operatingsystem = ((buffer[0] & 0xFF) << 24 | (buffer[1] & 0xFF) << 16 | (buffer[2] & 0xFF) << 8 | buffer[3] & 0xFF);

    // print raw values
    printf("Operating system of file: %x %x %x %x\n", buffer[0] & 0xFF, buffer[1] & 0xFF, buffer[2] & 0xFF, buffer[3] & 0xFF);
    // print value
    printf("Operating system of file: %u\n", operatingsystem);

    fclose(fptr);

    return 0;
}