[C] ReadFile/WriteFile

#include <conio.h>
#include <stdio.h>
#include <windows.h>
#include <shlobj.h>
 
struct Student
{
    int code;
    char name[20];
    char surname[20];
    char group[10];
};
 
BOOL CheckStudentDirAndFile(void);
void MakeStudents(Student *st);
void WriteStudentsToFile(Student *st, int stud_number, DWORD *nb);
void ReadStudentsFromFile(int stud_number, DWORD *nb);
void CopyStudentsToDocs(void);
 
int main()
{
    if(CheckStudentDirAndFile() == TRUE)
    {
        HANDLE hFindFile;
        WIN32_FIND_DATAA fdFindData;
        SYSTEMTIME smSysTime;
        hFindFile=FindFirstFileA("C:\\Student\\stud.dat",&fdFindData);
        if(hFindFile != INVALID_HANDLE_VALUE)
        {
            FileTimeToSystemTime(&fdFindData.ftLastWriteTime, &smSysTime);
            printf("%s\t%d.%d.%d  %d:%d\n",fdFindData.cFileName,smSysTime.wDay,smSysTime.wMonth,smSysTime.wYear, smSysTime.wHour, smSysTime.wMinute);
            FindClose(hFindFile);
            printf("Press any key to exit...\n");
            _getch();
            return 0;
        }
    }
    else
    {
        DWORD nb;
        int stud_number=0;
        printf("Enter student's number: ");
        scanf_s("%d", &stud_number);
        Student* st=new Student[stud_number];
        for (int i=0;i<stud_number;i++)
            MakeStudents(&st[i]);
 
        WriteStudentsToFile(st, stud_number, &nb);
        ReadStudentsFromFile(stud_number, &nb);
        CopyStudentsToDocs();
        printf("Press any key to exit...\n");
        _getch();
        return 0;
    }
}
 
BOOL CheckStudentDirAndFile(void)
{
    HANDLE hFile;
    WIN32_FIND_DATAA fdFindData;
    hFile=FindFirstFileA(("C:\\Student\\stud.dat"),&fdFindData);
    if(hFile != INVALID_HANDLE_VALUE)
    {
        FindClose(hFile);
        printf("Founded file C:\\Student\\stud.dat!\n");
        return TRUE;
    }
    else
    {
        if(CreateDirectoryA("C:\\Student", NULL))
        {
            printf("Directory C:\\Student created successfully!\n");
            hFile = CreateFileA("C:\\Student\\stud.dat",GENERIC_WRITE,0,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
            
            if(hFile)
                printf("File stud.dat created successfully!\n");
            else
                printf("Can not create file stud.dat in C:\\Student!\n");
 
            CloseHandle(hFile);
            return FALSE;
        }
        else
        {
            printf("Can not create directry C:\\Students! Possibly already exist.\n");
            CloseHandle(hFile);
            return FALSE;
        }
    }
}
 
void MakeStudents(Student *st)
{
    printf("Student code: ");
    scanf_s("%d", &st->code);
    printf("Student name: ");
    scanf_s("%s", &st->name);
    printf("Student surname: ");
    scanf_s("%s", &st->surname);
    printf("Student group: ");
    scanf_s("%s", &st->group);
}
 
void WriteStudentsToFile(Student *st, int stud_number, DWORD *nb)
{
    HANDLE hFile;
    char file_path[] = "C:\\Student\\stud.dat";
    hFile = CreateFileA(file_path, GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if(!hFile)
    {
        printf("Error while creating file %s for writing!\n", file_path);
        CloseHandle(hFile);
    }
    else
    {
        SetFilePointer(hFile, 4, NULL, FILE_END);
        for (int i=0;i<stud_number;i++)
            WriteFile(hFile,&i,sizeof(&st[i]),&*nb,NULL);
        CloseHandle(hFile);
        printf("\nStudents writed to file %s\n", file_path);
    }
}
 
void ReadStudentsFromFile(int stud_number, DWORD *nb)
{
    HANDLE hFile;
    char file_path[] = "C:\\Student\\stud.dat";
    hFile = CreateFileA(file_path, GENERIC_READ, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if(!hFile)
    {
        printf("Error while creating file %s for reading!\n", file_path);
        CloseHandle(hFile);
    }
    else
    {
        printf("%s contains:\n\n", file_path);
        Student *st_buf;
        int i=1;
        ReadFile(hFile, &st_buf, sizeof(Student), &*nb,NULL);
        while (nb!=0)
        {   
            printf("----------%d----------\n", i++);
            printf("Student code: %d\n", st_buf->code);
            printf("Student name: %s\n", st_buf->name);
            printf("Student surname: %s\n", st_buf->surname);
            printf("Student group: %s\n", st_buf->group);
            printf("----------------------\n");
            ReadFile(hFile, &st_buf, sizeof(Student), &*nb, NULL);
        }
        CloseHandle(hFile);
    }
}
 
void CopyStudentsToDocs(void)
{
    char docs_path[50];
    char path[100];
    SHGetFolderPathA(NULL, CSIDL_COMMON_DOCUMENTS, NULL, SHGFP_TYPE_CURRENT, docs_path);
    sprintf_s(path, "%s\\stud.dat", docs_path);
    if(CopyFileA("C:\\Student\\stud.dat", path, TRUE) != FALSE)
        printf("stud.dat copied to %s\n", path);
    else
        printf("Can not copy C:\\Student\\stud.dat file to %s", path);
}