如何使用WINAPI读取整个二进制文件？

Question

I have a task to save structure to binary file and then print out the file to console. Data is being written to a file, but when I read it I get output only first word. I guess I'm missing something in my code. Will appreciate your help.

struct Book
{
  char bookName[40];
  char author[40];
  float rating;
};

Book book;

int bookAmount  = 2;

for (int i = 0; i < bookAmount; i++){
  cout << "Book Name: ";
  cin >> book.bookName;

  cout << "Book Author: ";
  cin >> book.author;

  cout << "Rating: ";
  cin >> book.rating;

   DWORD dwBytesWritten;
   BOOL writeFile = WriteFile(hFile, &book, sizeof(book), &dwBytesWritten, NULL);
}
DWORD numberOfBytesToRead;
char buff[255];

HANDLE hFile = CreateFile("file.dat", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
BOOL readFile = ReadFile(hFile, &buff, sizeof(book), &numberOfBytesToRead, NULL);

  if (readFile != 0) {

    while (numberOfBytesToRead != 0) {
      cout << buff << endl;
      ReadFile(hFile, &buff, sizeof(book), &numberOfBytesToRead, NULL);
    }

  }

Answer 1

BOOL readFile = ReadFile(hFile, &buff, sizeof(book), &numberOfBytesToRead, NULL);
cout << buff << endl;

You are reading to a char[255] , not a Book structure. Hence the title of the book ends with an \\0, that's why only that is printed. cout operates on a char array, not on the structure.

Bad way to store/receive data btw. Prone to security issues.