Difference between revisions of "TStringList-TStrings Tutorial"
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The TStringList(Or TStrings) is much like a fancy dynamic array or Set of Strings(Not Possible). It will come in handy alot when programming and I'm going to teach you basic TStringList Usage! | The TStringList(Or TStrings) is much like a fancy dynamic array or Set of Strings(Not Possible). It will come in handy alot when programming and I'm going to teach you basic TStringList Usage! | ||
− | <Delphi> | + | <Delphi>program StrList; |
− | |||
− | |||
− | |||
− | |||
+ | var | ||
+ | Str: TStringList; | ||
begin | begin | ||
− | Str := TStringList.Create;//This is needed when using this class(or most classes) | + | Str := TStringList.Create; // This is needed when using this class(or most classes) |
Str.Add('Some String!'); | Str.Add('Some String!'); | ||
Readln; | Readln; | ||
− | end; | + | end;</Delphi> |
− | </Delphi> | ||
This is a simple program(Console) that will create and add one string to a string list! | This is a simple program(Console) that will create and add one string to a string list! | ||
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How about a more juicy example, Eh? | How about a more juicy example, Eh? | ||
− | <Delphi> | + | <Delphi>program StrList; |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
+ | var | ||
+ | Str: TStringList; | ||
+ | S: String; | ||
+ | Counter: Integer; | ||
begin | begin | ||
Str := TStringList.Create; | Str := TStringList.Create; | ||
Writeln('String List Test'); | Writeln('String List Test'); | ||
− | + | repeat | |
− | + | Writeln('Input a string to add'); | |
− | + | Readln(S); | |
− | + | if (S = 'EXIT') then Halt; | |
− | + | if not (S = '') then | |
− | + | begin | |
− | + | Counter := Str.Add(S); | |
− | + | Writeln('String: ' + S + ' was Added!'); | |
− | + | Writeln('Index is: ' + IntToStr(Counter); // The counter will always become the index of the last thing added | |
− | + | end rlse Writeln('Nothing Inputed :D'); | |
− | + | until (S = 'EXIT'); | |
− | end; | + | end;</Delphi> |
− | </Delphi> | ||
==File Handling== | ==File Handling== | ||
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LoadFromFile will open the file and add the file data to the list string by string. | LoadFromFile will open the file and add the file data to the list string by string. | ||
− | <Delphi> | + | <Delphi>var |
− | + | Str: TStringList; | |
− | |||
begin | begin | ||
Str := TStringList.Create; | Str := TStringList.Create; | ||
Line 76: | Line 68: | ||
Str.Add('Hello'); | Str.Add('Hello'); | ||
Str.SaveToFile('SomeFile.txt'); | Str.SaveToFile('SomeFile.txt'); | ||
− | end; | + | end;</Delphi> |
− | </Delphi> | ||
You just opened a file,edited it and saved it right back to were it was! | You just opened a file,edited it and saved it right back to were it was! | ||
Line 87: | Line 78: | ||
Hope I helped! | Hope I helped! | ||
+ | |||
+ | [[Category:Tutorials]] |
Revision as of 22:27, 9 September 2010
TStringList
The TStringList(Or TStrings) is much like a fancy dynamic array or Set of Strings(Not Possible). It will come in handy alot when programming and I'm going to teach you basic TStringList Usage!
<Delphi>program StrList;
var
Str: TStringList;
begin
Str := TStringList.Create; // This is needed when using this class(or most classes) Str.Add('Some String!'); Readln;
end;</Delphi>
This is a simple program(Console) that will create and add one string to a string list! Now heres some things you should know:
Create - Will create the string list for modifying.
Count - Is a counter for the amount of strings in the List. It is a zero based counter
Add - Will allow you to add one string to the string list. It is a Function that will return the Index of the String. This is Were the counter comes in handy.
Delete - Will delete a string from the string list. Just know that you do not simply input the string, you have to input the index of the string.(Like I said. Its like a fancy Dynamic Array)
IndexOf - Will allow you to return the index of the string in the list. If it is not found it returns -1.
Clear - Will clear the list.
Example
How about a more juicy example, Eh?
<Delphi>program StrList;
var
Str: TStringList; S: String; Counter: Integer;
begin
Str := TStringList.Create; Writeln('String List Test'); repeat Writeln('Input a string to add'); Readln(S); if (S = 'EXIT') then Halt; if not (S = ) then begin Counter := Str.Add(S); Writeln('String: ' + S + ' was Added!'); Writeln('Index is: ' + IntToStr(Counter); // The counter will always become the index of the last thing added end rlse Writeln('Nothing Inputed :D'); until (S = 'EXIT');
end;</Delphi>
File Handling
When using the TStringList you have 2 main file handling procedures. SaveToFile And LoadFromFile By Using SavetoFile it will save all strings in the list to a file. LoadFromFile will open the file and add the file data to the list string by string.
<Delphi>var
Str: TStringList;
begin
Str := TStringList.Create; Str.LoadFromFile('SomeFile.txt'); Str.Add('Hello'); Str.SaveToFile('SomeFile.txt');
end;</Delphi>
You just opened a file,edited it and saved it right back to were it was!
Keep Learning
You can learn all the different procedures,functions and property's Here: [1]
IF you feel i might have left something out, Modify At Will!
Hope I helped!