control name instead of index

[hennep]

How can I address a label on a form by its name ( instead of addressing by an index).

I have a form with 256 labels. I tried the code below but cbuilder cannot handle: Controls["name"];

void Refresh( void ) {
static unsigned short int iLabel = 0;
TLabel *c;
char buf1[12], buf2[12];
if( ++iLabel >= 256 ) {
iLabel = 0;
}
sprintf( buf1, "lblByte%02X", iLabel );
sprintf( buf2, "%02X", P->Value(iLabel) );
c = (TLabel*)this->Controls[buf1];
c->Caption = buf2;
}

 

[Pavlo]

Greetinx!

The following sample code shows how to find out 'n'th control (here label) on form:

//n is preinitialized variable (number of control)
TControl *__fastcall TForm1::LabelSearch(int n)
{
for(int j = 0; j < ControlCount; j++)
if(Controls[j]->Name == &quot;Label&quot;+AnsiString)
return Controls[j];
return NULL;
} Happy programming!))

 

[hennep]

Thanks Pavlo,

I wonder if this method is quick enough. There are 256 labels on the form. executing the for loop 256 times was not what I wanted.

I came up with this solution:

TLabel *c;
c = (TLabel*) this->FindComponent(&quot;Name of Label&quot;
c->Caption = &quot;Caption for Label&quot;;

I don't know how the findcomponent function works internally, it might do the same loop through all the controls.

When I can find some time I will do a performance test with both methods.

Hennie.