TControl.GetTextLen Method

Returns the length of the control's text.

Pascal

function GetTextLen: Integer;

C++

__fastcall int GetTextLen();

Description

Call GetTextLen to find the length of the control's text. This is the size needed for a text buffer to be used by the GetTextBuf method.

C++ Examples:

Copy Code

/*
This example requires two edit boxes and a button.  This example
copies the text in an edit box into a null-terminated string, and
puts this string in another edit box when the user clicks the
button on the form.
*/
#include <memory>       //for STL auto_ptr class

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  int Size = Edit1->GetTextLen(); //Get length of string in Edit1
  Size++;                      //Add room for null character
//  Char *Buffer = new Char[Size];  //Creates Buffer dynamic variable
  std::auto_ptr<Char> Buffer(new Char[Size]);
  Edit1->GetTextBuf(Buffer.get(),Size); //Puts Edit1->Text into Buffer
  Edit2->Text = Buffer.get();
}
/*
Note: the same thing could be accomplished more simply as follows:
*/ 
void __fastcall TForm1::Button2Click(TObject *Sender)
{
  Edit2->Text = Edit1->Text;
}

Delphi Examples:

Copy Code

{
This example requires two edit boxes and a button.  This example
copies the text in an edit box into a null-terminated string, and
puts this string in another edit box when the user clicks the
button on the form.
} 
procedure TForm1.Button1Click(Sender: TObject);
var
  Buffer: PChar;
  Size: Byte;
begin
  Size := Edit1.GetTextLen;       {Get length of string in Edit1}
  Inc(Size);                      {Add room for null character}
  GetMem(Buffer, Size);           {Creates Buffer dynamic variable}
  Edit1.GetTextBuf(Buffer,Size);  {Puts Edit1.Text into Buffer}
  Edit2.Text := StrPas(Buffer);   {Converts Buffer to a Pascal-style string}
  FreeMem(Buffer, Size);{Frees memory allocated to Buffer}
end;

{
Note: the same thing could be accomplished more simply as follows:
} 
procedure TForm1.Button2Click(Sender: TObject);
begin
  Edit2.Text := Edit1.Text;
end;