win32-读取控制台中所有的字符串

我们可以先读取字符串所占的行数，再乘以控制台的实际宽度

bool ReadFromConsole() {
  HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
  int bufsize;
  CONSOLE_SCREEN_BUFFER_INFO csbi;
  if (!GetConsoleScreenBufferInfo(hConsole, &csbi)) {
    LOG(ERROR) << "Cannot determine console size.";
    return false;
  } else {
    // 计算 buffer 需要的字符个数
    // 当前控制台的宽度乘以字符行数
    bufsize =
        (csbi.srWindow.Right - csbi.srWindow.Left) * csbi.dwCursorPosition.Y;
  }

  WCHAR *buf = new WCHAR[bufsize];
  COORD pos{0};
  DWORD num_read;
  if (ReadConsoleOutputCharacter(hConsole, buf, bufsize, pos, &num_read) == 0) {
    delete[] buf;
    return false;
  }
  delete[] buf;
  return true;
}