Read byte from binary file : FileStream « File Directory « Visual C++ .NET

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We'll look at four approaches for serial IO access. Reading and writing to a file is one of the most required features of any standard library for a language or an OS API. Many times How to read binary file in visual c++ used different methods to perform IO, but I haven't got a chance to compare them or look deeper. In this article, I'll present an implementation of one quite simple IO problem, but done using four different options: This will be a background for the next article where we'll discuss performance of the APIs.

To present all the IO access methods I've created an application that transforms an input file into an output file using binary mode, converting block of bytes by block you can see all the code at this link on GitHub. The size of the block can be configured, as shown in Figure 1. The method that processes each block is not relevant since we want to focus on the IO access how to read binary file in visual c++.

It might be a binary copy or a cipher operation. The application is simplified, so we assume that the output file will be the same size as the input.

Later, as an extension, we can discuss potential improvements: The example is built in the following way: First, an interface IFileTransformer specifies input file name, output file name, Process method. And finally, the program runs in console mode and it takes arguments about file names, block size, used API. It gives low-level access to a file, both in binary or text mode.

Here's the quick summary of what we have in the package:. As for the reference, there's an even "lower" level API that could be mentioned here.

The API is specified in the io. First we need to open it via fopen and then close via fclose. In my example I wrapped those calls into an RAII object, which will make sure the stream is closed even on error. You can read more about custom deleters for smart pointers on my blog. Note, for simplicity I am not checking memory errors here, and I assume the block fits into memory. The above example shows the core processing loop: The functions offer better parameter validation, and they require buffer size is passed to any function that writes to a buffer to avoid buffer overrun errors.

At the end, we'll compare all solutions. The main processing loop is not shorter than the C example. In fact, we have to compute more to calculate a number of bytes written to a file. To do that we have to use position in the file before the write and after see the call to outputStream.

Also, to get a number of bytes read we need to use inputStream. I think, I prefer the C API, how to read binary file in visual c++ a number of bytes read and written is returned from the corresponding function call. Still, for a lot of applications such the two APIs are good enough.

However if your application is designed specifically for the Windows platform, there's a native API for IO that will give you a lot of options. I agree to this site's Privacy Policy.

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This blog post provides a short tutorial that shows how you can use Conan to create, share and consume binary packages directly with a pure Visual Studio approach. Microsoft has launched vcpkg, which is a package manager for Visual Studio based on CMake scripts.

While it can be useful to retrieve and build the latest stable version of OSS libraries from sources, it has some limitations when used as a dependency manager for user projects. One of them is the typically large size of projects, which requires managing pre-built binaries, since building from sources is not always feasible. Another inconvenience is that installing different versions of the same package simultaneously requires to manage different instances of vcpkg.

In the course of this tutorial you will see that Conan can be used as a package manager for both pure Visual Studio and hybrid stacks. Start by cloning the existing example repository. It contains a src folder with the source code and a build folder with a Visual Studio solution containing 2 projects: Open the Visual Studio solution:.

Note that since the hello. In this example, the consuming application uses CMake to build, but it could also have used Visual Studio. We use CMake because it is the default generated with conan new , and to show that packages created from Visual Studio projects can also be consumed by other build systems such as CMake. This shows how Conan decouples the build system, which can help, for example, in a progressive migration to a new build system.

Once you have created a package locally, you can upload it to a Conan remote server. Another alternative is to configure the permissions in the remote, to allow uploading packages with different usernames.

As in the previous example, the repository contains a Visual Studio solution in the build folder. But if you try to open it, it will fail to load. This is because it expects to find a file with the required information about dependencies, so you first have to obtain that file. You will see that it created two files: Now you can open the IDE and build and run the app by the way, all the chat function does is call the hello function two or three times depending on the build type:.

If you wish to link with the debug version of the Hello package, just install it and change the IDE build type:. Again, there is a conanfile. The recipe is almost identical to the previous one, but with two minor differences:. You can also repeat the process for different build types and architectures, as above. The binary packages for the ChatLib library can also be uploaded and shared. If needed, you can also build for older versions of Visual Studio.

In that case, you would probably have different solution projects inside your build folder. It does not support multi-config packages i. If you need this feature, please report and provide feedback by submitting an issue in github. Microsoft Windows and Visual Studio have always been first class citizens in Conan. While the Conan documentation and examples largely use CMake for convenience, it is not a requirement.

This blog post shows that Conan can be used as a package manager for both pure Visual Studio and hybrid stacks that use other build systems. The main steps of this tutorial are: