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Accepting parms in an exe.

Posted on 2000-04-11
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Last Modified: 2010-04-04

How can I accept parameters (for example 4 integers and a string) in my exe when its called?  I want the exe to be able to use the parameters in the main form when the form loads.  D3.
 
              Thank you
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Question by:jexd99
6 Comments
 
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Motaz earned 50 total points
ID: 2706552
use ParamStr(1), ParamStr(2) ...

for example write this code in form's OnCreate event:

var
  i: Integer;
begin
  for i:= 1 to ParamCount do
    Memo1.Lines.Add(ParamStr(i));
end;

This will display all parameters in a Memo

If you need any help please tell me
Motaz
www.geocities.com/motaz1
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Expert Comment

by:ShadowFax
ID: 2707033
Or try this:

var
  MyInt1, MyInt2, MyInt3, MyInt4:   Integer ;
  MyString: String ;

procedure MyForm.Create(Sender: TObject);
begin
// check if there are the required params
  if ParamCount = 6 then
  begin
// populate your variables
    MyInt1 := StrToInt(ParamStr(1)) ;
    MyInt2 := StrToInt(ParamStr(2)) ;
    MyInt3 := StrToInt(ParamStr(3)) ;
    MyInt4 := StrToInt(ParamStr(4)) ;
    MyString := ParamStr(5) ;
  end
  else
// can close the app which would prevent the app from being run without the run params, or you can just ignore and put default values into your variables
    Application.Terminate ;
end;

HTH

Gavin
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Expert Comment

by:ShadowFax
ID: 2707038
Remember...

ParamStr(0) hold your application Path and and name(ie. c:\program files\MyApp.exe)
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LVL 1

Expert Comment

by:nrico
ID: 2707305
And now for a little explanation of this code :-) :

Your program can get passed command-line parameters, these are separated by spaces. To make a string with spaces in it appear as a single parameter, put "" around it.
You can access the number of parameters passed through the ParamCount function, and you can get the separate parameters as strings using ParamCount(<Number>);
To convert these to integers, you can use the StrToInt() function.
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Expert Comment

by:flooder
ID: 2711025
You can use ParamStr(x) and
ParamCount
Remember as said above space count as seperate parameters.
So long file names send by explorer will be a lot of paramters.
Secondly all parameters passes are strings so you would have to know that for eg the first parameter is always a integer. Or what you can do is send a code with each parameter that tells your program what the type should be.
eg
I=integer  I234
$=String   $Hullo_World
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Author Comment

by:jexd99
ID: 2714018
Thank you all for your input. The answers were all very informative, this is slick! :)  (I have to give the pts to the one who answered first, as the answers were all equally good).

          Thanks again  
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