As @Mgetz says, you probably forgot to #include <fstream>. The reason you didn’t get a not declared error and instead this incomplete type not allowed error has to do with what happens when there is a type that has been “forward declared”, but not yet fully defined. Look at this example: Notice we could not actually instantiate a Foo object or … Read more
This seems to be answered – #include <fstream>. The message means :- incomplete type – the class has not been defined with a full class. The compiler has seen statements such as class ifstream; which allow it to understand that a class exists, but does not know how much memory the class takes up. The forward declaration allows the … Read more
You’re trying to pass a char to LoadFileToString which takes in a char*. I think what you intend to do is this Notice that I’m reading the input into a string instead of a char since the LoadFileToString expects a (C-style) string to be passed in; instead you’re reading and trying to pass a character … Read more
It’s the other way around. When ios::ate is set, the initial position will be the end of the file, but you are free to seek thereafter. When ios::app is set, all output operations are performed at the end of the file. Since all writes are implicitly preceded by seeks, there is no way to write elsewhere.
According to the C++ reference (here) getline sets the ios::fail when count-1 characters have been extracted. You would have to call filein.clear(); in between the getline() calls.
ios::out opens the file for writing. ios::binary makes sure the data is read or written without translating new line characters to and from \r\n on the fly. In other words, exactly what you give the stream is exactly what’s written.
Just follow closely the chain of events. Grab 10 Grab 20 Grab 30 Grab EOF Look at the second-to-last iteration. You grabbed 30, then carried on to check for EOF. You haven’t reached EOF because the EOF mark hasn’t been read yet (“binarically” speaking, its conceptual location is just after the 30 line). Therefore you … Read more
the function for streams that deals with std::string is not a member function of istream but rather a free function it is used like so. (the member function version deals with char*). It is worth noting there are better safer ways to do what you are trying to do like so: don’t reinvent the wheel; … Read more
ou can use std::getline : Also note that it’s better you just construct the file stream with the file names in it’s constructor rather than explicitly opening (same goes for closing, just let the destructor do the work). Further documentation about std::string::getline() can be read at CPP Reference. Probably the easiest way to read a whole text file is just … Read more