In C++ Builder sorting text string lines is very easy by setting Sorted property of a StringList to true. This example below sorts a given text file and saves as sorted in same name.
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void sort_textfile(UnicodeString filename) { auto str_list = new TStringList; str_list->LoadFromFile(filename); str_list->Sorted = true; str_list->SaveToFile(filename); str_list->Free(); } |
Sorting a Text File with a Console VCL Application
- Create a new C++ Builder Console VCL project, Save all unit and project files into a folder. modify lines as below
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#include <vcl.h> void sort_textfile(UnicodeString filename) { auto str_list = new TStringList; str_list->LoadFromFile(filename); str_list->Sorted = true; str_list->SaveToFile(filename); str_list->Free(); } int _tmain(int argc, _TCHAR* argv[]) { sort_textfile("D:\\test.txt"); return 0; } |
2. Hit F9 or press Run button to run your code.
That’s All.
Sorting a Text File with a Console FMX Application
If you want to develop on MutliDevice platforms you must create FireMonkey Project. You can do as same here in C++ Builder FMX Console Project, as below;
1. Create a new C++ Builder Console FMX project, Save all unit and project files into a folder. modify lines as below
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#include <fmx.h> void sort_textfile(UnicodeString filename) { auto str_list = new TStringList; str_list->LoadFromFile(filename); str_list->Sorted = true; str_list->SaveToFile(filename); str_list->Free(); } int _tmain(int argc, _TCHAR* argv[]) { sort_textfile("D:\\test.txt"); return 0; } |
2. Hit F9 or press Run button to run your code.
Sorting a Text File with a GUI based FMX or VCL Visual Application
If you want to use GUIs (Like Buttons, Memos, Edits, etc.) we can use OpenDialog component and a OnClick() event of a Button.
1. Create a new C++ Builder Console FMX or VCL project, Save all unit and project files into a folder. modify lines as below
2. Drag OpenDialog component on to form and a Button. Double click to button to create OnClick() event and modify it as below.
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void __fastcall TForm1::Button1Click(TObject *Sender) { OpenDialog1->FileName=""; OpenDialog1->Execute(); if(FileExists(OpenDialog1->FileName)) { sort_textfile(OpenDialog1->FileName); } } |
3. Add our sort_textfile() procedure above these lines or in public declarations of TForm in Unit1.h
4. Hit F9 or press Run button to run your code.
Note that file format should be in *.txt form and it will be modified after used.
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