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How To Get A Directory Name From A Path String

How can I get directory name from a path string in C++ Builder? What is GetDirectoryName Method? What is the Syntax of GetDirectoryName Method? Is there an Example to GetDirectoryName Method?

C++ Builder has a lot of specific methods in its SysUtils library that is included in vcl and fmx libraries. Some of these are grouped as a 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.IOUtilsSystem.SysUtils libraries. These all 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. We can also check drive, files or directories if they are exist or not in that given path. And we can get directory name from a given path string.

Let’s see how we can use GetDirectoryName Method to get directory from a path string on Windows.

What is the GetDirectoryName Method in Modern C++ ?

GetDirectoryName (System::IOUtils::TPath::GetDirectoryName) is a Path Manipulation Routine that extracts the drive and the first directory part of a path/filename string.

GetDirectoryName extracts the drive and directory parts of the given file name. The resulting string is empty if FileName contains no drive or directory parts. The following table lists the parameters expected by this method.

NameMeaning
FileNameThe file name from which the drive and directory are extracted.

Note: GetDirectoryName raises an exception if the given file name contains invalid characters.

What is the Syntax of the GetDirectoryName Method in Modern C++ ?

Here is the Syntax of GetDirectoryName() Method:

Is there a simple example of using the GetDirectoryName Method in Modern C++?

GetDirectoryName Method returns a UnicodeString, we can get drive and directory name from a given path string as below,

Example 1:

Let’s see return from a full path string of a file.

and the output form of ShowMessage() will display this result path String,

Example 2:

Let’s see return from a path string of a path string that starts with “\”.

and the output form of ShowMessage() will display this result path String,

Example 3:

Let’s see return from a path string of a path string that has folder and file names,

and the output form of ShowMessage() will display this result path String,

Here is a full Example of the GetDirectoryName Method in Modern C++

Here is the full C++ Builder VCL example with the Memo (TMemo) component below,

Use this dynamic link to search for more path manipulation methods: https://learncplusplus.org/?s=path

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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