You should have a look at Boost Serialization. If you can’t use 3rd party libraries, you must know that C++ doesn’t support serialization directly. This means you’ll have to do it yourself. This article shows a nice way of serializing a custom object to the disk and retrieving it back. And this tutorial shows you … Read more
If a file contains only the decimal bytes 9–13, 32–126, it’s probably a pure ASCII text file. Otherwise, it’s not. However, it may still be text in another encoding. If, in addition to the above bytes, the file contains only the decimal bytes 128–255, it’s probably a text file in an 8-bit or variable-length ASCII-based … Read more
The problem is the strings in your struct. I found that marshaling types like byte/short/int is not a problem; but when you need to marshal into a complex type such as a string, you need your struct to explicitly mimic an unmanaged type. You can do this with the MarshalAs attrib. For your example, the … Read more
Subversion has locks, and they aren’t just advisory. They can be enforced using the svn:needs-lock attribute (but can also be deliberately broken if necessary). It’s the right solution for managing non-mergeable files. The company I work for stores just about everything in Subversion, and uses svn:needs-lock for all non-mergeable files. I disagree with “locks are … Read more
Menu File → Open → File Select the file to be opened On the open file dialog at the bottom there is a down arrow on the “Open” button Click “Open With…” Click “Binary Editor” Click OK Or for the keyboard geeks out there: Ctrl + o Ctrl + v (paste filename) tab tab ↓ … Read more
When testing for performance, I would include a test case for: std::vector<BYTE> readFile(const char* filename) { // open the file: std::ifstream file(filename, std::ios::binary); // Stop eating new lines in binary mode!!! file.unsetf(std::ios::skipws); // get its size: std::streampos fileSize; file.seekg(0, std::ios::end); fileSize = file.tellg(); file.seekg(0, std::ios::beg); // reserve capacity std::vector<BYTE> vec; vec.reserve(fileSize); // read the data: … Read more
Here’s a function extend_file_and_insert() that does the job, more or less. #include <sys/stat.h> #include <unistd.h> enum { BUFFERSIZE = 64 * 1024 }; #define MIN(x, y) (((x) < (y)) ? (x) : (y)) /* off_t is signed ssize_t is signed size_t is unsigned off_t for lseek() offset and return size_t for read()/write() length ssize_t for … Read more
You may have undefined behavior, with the following scenario: int nbins; does not initialize nbins, so it contains junk data, potentially a very large number. fread(&nbins, sizeof(int), 1, fd); is not tested so could fail and keep nbins uninitialized. Read about fread. printf(“nbins = %d”, nbins); has no \n and is not followed by an … Read more
OK, after a lot of digging, I found out that requestSettings should have: encoding: null And then body will be of type Buffer, instead of the default, which is string.
I generally store files on the file-system, since that’s what its there for, though there are exceptions. For files, the file-system is the most flexible and performant solution (usually). There are a few problems with storing files on a database – files are generally much larger than your average row – result-sets containing many large … Read more