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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 see how we can use ExtractFileDrive Method to extract a File Drive Name from the File Path String on Windows.
What does the ExtractFileDrive method do?
ExtractFileDrive method (System::SysUtils::ExtractFileDrive) is a Path Manipulation Routine that returns the drive portion of a file name from a path string. In other terms it returns a string containing the drive portion of a fully qualified path name for the file passed in the FileName parameter. For file names with drive letters, the result is in the form ‘<drive>’. For file names with a UNC path (Universal Naming Convention), the result is in the form ‘\\<servername>\<sharedname>’. If the given path contains neither style of path prefix, the result is an empty string. On Linux and MacOS, ExtractFileDrive always returns a zero-length string.
Syntax:
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System::UnicodeString __fastcall ExtractFileDrive(const System::UnicodeString FileName); // overload |
Here is a simple C++ example of how to use the ExtractFileDrive method
We can separate drives and folders in a path string with “\\” to define single \ and we can extract drive name as below,
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String drive = ExtractFileDrive( L"D:\\MainFolder\\SubFolder\\myimage.jpg" ); |
the output drive string will be “D:”.
Is there a more complete C++ example of using the ExtractFileDrive method?
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#include <vcl.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { String str = L"D:\\MainFolder\\SubFolder\\myimage.jpg"; String drive = ExtractFileDrive( str ); ShowMessage( L"Drive: " + drive ); } |
Here ShowMessage() command will extract and display drive name from this string as “D:” as below,
We can easily use this method with the OpenDialog, SaveDialog components or with the string properties of other components. Here is the C++ Builder VCL Example,
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#include <vcl.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { OpenDialog1->Execute(); String drive = ExtractFileDrive( OpenDialog1->FileName ); ShowMessage( L"Drive: " + drive); } |
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