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How To Change A File Extension On Windows Using C+

C++ Builder has specific Path Manipulation Routines that allows user to edit, extract, get and set drive name, directory name, file name, file extensions, .. etc and these methods are combined in Vcl.FileCtrl, System.IOUtils, System.SysUtils libraries. These path manipulation methods are easy to use and easy to get or set file path strings in that operating system. These can be used with other component properties like FileName property of OpenDialog, SaveDialog components.

Let’s see how we use ChangeFileExt to change extension of a file from given a file path String on Windows.

Use the ChangeFileExt method

ChangeFileExt (System::SysUtils::ChangeFileExt) is a Path Manipulation Routine that creates a new file name string changes the extension of a file name. ChangeFileExt takes the file name passed in FileName and changes the extension of the file name to the extension passed in Extension. Extension specifies the new extension, including the initial dot character.

ChangeFileExt does not rename the actual file, it just creates a new file name string. Note that this function works with multi-byte character sets (MBCS) that means it uses UnicodeStrings.

Here is the ChangeFileExt method’s syntax

A simple example of how to use the ChangeFileExt method in C++

We should use L”” literal for the UnicodeStrings and we can separate drives and folders in a path string with “\\” to define single \ and we can get new file name with extension change from a given file path string as below,

Note that again this ChangeFileExt method does not rename the actual file.

Here is the simple full C++ Builder VCL example

We can use this method with file name strings of any components. For example we can use this with OpenDialog. We can use bool=RenameFile(old, new) Method to rename the selected file with a new extension as below,

In this example, user selects a file by using OpenDialog file browser and it generates a new file name string with a given extension. Then we change its name to this new name with new extension.

C++ Builder is the easiest and fastest C and C++ IDE for building simple or professional applications on the Windows, MacOS, iOS & Android operating systems. It is also easy for beginners to learn with its wide range of samples, tutorials, help files, and LSP support for code. RAD Studio’s C++ Builder version comes with the award-winning VCL framework for high-performance native Windows apps and the powerful FireMonkey (FMX) framework for cross-platform UIs.

There is a free C++ Builder Community Edition for students, beginners, and startups; it can be downloaded from here. For professional developers, there are Professional, Architect, or Enterprise versions of C++ Builder and there is a trial version you can download from here.


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About author

33+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux and some other operating systems. Dr. Yilmaz Yoru was born in 1974, Eskisehir-Turkey. He graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. One year later he started to work in the same university as an assistant. He received his MSc and PhD degrees from the same department of the same university. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics and Artificial Intelligence. He also likes the graphical 2D & 3D design and high-end innovations.
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