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how to my applicattion accept parameters..?

Posted on 2004-08-16
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Last Modified: 2010-04-05
i need eexecute my app like this
   MyApplication.exe [servername][databasename] [username][password] how..?

hot to recognize this paremters into MYApplication.exe? and how to accept this parameters?...
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Question by:ThoseBug
11 Comments
 
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by:
Chadak earned 100 total points
Comment Utility
Hi

   just use paramcount which return the number of param that was used
and use paramstr(0) to get the first parameter etc...
There are the 2 method you need to work with parameters

Chad
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Expert Comment

by:LMuadDIb
Comment Utility
example code:
----------------

{ TODO -oUser -cConsole Main : Insert code here }

    sc:=['/','-','|'];
    sCmdLn := lowercase(CmdLine);
    { If help is needed display help & example, and then exit }
    if (pos('help',sCmdLn) > 0) or (pos('?',sCmdLn) > 0) then
    begin
        WriteLineOutPut('Application called with HELP parameter!');
        WriteLineOutPut('EXAMPLE:');
        WriteLineOutPut('   command format: appname [options]');
        WriteLineOutPut('   Explanations of usage are as follow:');
        WriteLineOutPut('   -o       : < Output Data to text file >');
        WriteLineOutPut('Example:');
        WriteLineOutPut('COPYRIGHT ' + #169 + ' 2004 Coder');
        exit;
    end;
    sCurDir :=  ExtractFilePath(ParamStr(0));  {Store the dir where your app was executed from}
    if ParamCount > 0 then  { Command line arguments were passed, parse them }
    begin  
    { [servername][databasename] [username][password] }          
    { -s <servername> -db <databasename> -u <username> -p <password> }
        for i:=1 to ParamCount do
        begin
            if ParamStr(i) = '-s' then
              servername := ParamStr(i + 1);
            if ParamStr(i) = '-db' then
              databasename  :=  ParamStr(i + 1);
            if ParamStr(i) = '-u' then
              username  :=  ParamStr(i + 1);
            if ParamStr(i) = '-p' then
              password  :=  ParamStr(i + 1);
        end;
    end;
    try
      Execute;
    except
      WriteLineOutPut('ERROR!');
      exit;
    end;

----------------
hope this helps.
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Expert Comment

by:mnasman
Comment Utility
Hello

Just quick sample to show the no of parameters passed to your application and each one with it's value

procedure TForm1.FormCreate(Sender: TObject);
var
 I : Integer;
begin
  ShowMessage('Total Parameters passed = ' + IntToStr(ParamCount));
  for I := 1 to ParamCount do
    ShowMessage('Param No ' + IntToStr(I) + ' Value = ' + ParamStr(I));
end;


HTH

Regards,
Mohammed
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Author Comment

by:ThoseBug
Comment Utility
sorry for the ignorance..but where i can do this code and how to call from antoher delphi program...when i try to execute from the run project1.exe someparameter i have a error...
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Expert Comment

by:LMuadDIb
Comment Utility
My example is for a console application, you didnt state if your program used a gui or not.
but my example can easily be adjusted to fit.

if you want to run your project from the ide you need to pass the parameters.
goto menu "Run" "Parameters"
insert some test parameters into the parmaeters field:
{ -s <servername> -db <databasename> -u <username> -p <password> }

-s 127.0.0.1 -db dbname -u myname -p pass

only other way to test is from the cmd prompt manually.
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Expert Comment

by:Ivanov_G
Comment Utility
If you program is called MyProgram.exe
you can run it with parameters typing:
"MyProgram db=testdb user=john pass=abcd"

from Delphi you set the parameters in Run / Parameters

from inside your application you can access the WHOLE command line with CmdLine function - it returns you a string.
you can also access parameters like this

  var
    param1  : String;
  begin
    param1 := ParamStr(1);

  in this case param1 = 'db=testdb'

  ParamCount returns you the number of parameters.
  ParamStr(0) - this is the file full name. The same as Application.ExeName.

  You can handle the command line parameters in OnCreate of the main form.

  Hope this helps
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Expert Comment

by:MikProg
Comment Utility
The best way is to use TStringList to hold program parameters

        ProgramParams:=TStringList.Create;
        for i:=1 to ParamCount do
        begin
            ProgramParams.Add(ParamStr(i);
        end;
// here you can assign defult values to parameters not assigned from command line
       if ProgramParams.Values['-db']='' then
            ProgramParams.Values['-db']:=DefaultDatabaseName;
// use these parameters
        servername := ProgramParams.Values['-s'];
        databasename  :=  ProgramParams.Values['-db'];
// so on so forth ...

// now you can save last run parameters
       ProgramParams.SaveToFile('ProgramName.cfg');
       
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Expert Comment

by:krypto2000
Comment Utility
Just make a new applicacation with a listView with two columns and viewStyle=report

The most important think is to know the ParamStr and the ParamCount variables...

Here is the procedure :

procedure TForm1.FormCreate(Sender: TObject);
var i: integer; AddedItem: TListItem;
begin
   for i := 1 to ParamCount do
      begin
      AddedItem := ListView1.Items.Add;
      AddedItem.Caption := 'Param[' + IntToStr(i) + ']';
      AddedItem.SubItems.Add(ParamStr(i));
      end;
end;
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