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; |
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| − | |||
| + | 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; |
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| − | |||
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| − | |||
| − | |||
| − | |||
| − | |||
| + | 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!
