Passing arguments using drupal_get_form()

Here is my custom module using hook,

Assume if I want to pass argument to custom1_default_form function call, how should i pass the argument?

<?php

function custom1_block($op,$delta=0){
    if($op=='list'){
        $block = array();
        $block[0]['info']=t('hello world');
        return $block;
    }else if($op=='view'){
        $block_content = '<p>THIS IS MY FIRST BLOCK</p>';
        $block['subject'] = 'HELLO WORLD';
        $block['content'] =drupal_get_form('custom1_default_form');
        return $block;      
    }  
}

function custom1_default_form () {
  $form = array();
    $form['nusoap_urls']['txt_name']  =
    array('#type' => 'textfield',
          '#title' => t('Please enter your name'),
          '#default_value' => variable_get('webservice_user_url',''),
          '#maxlength' => '40',
          '#size' => '20',
         // '#description' => t('<br />Root directory used to present the filebrowser user interface.')

          );
     $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Save Details'),
      );          
        return $form;    
  }

  function custom1_default_fo开发者_开发知识库rm_validate (&$form, &$form_state) {

    if(($form_state['values']['txt_name']) == '') {
        form_set_error('user_webservice', t('Enter a name'));
    }
  }

  function custom1_default_form_submit ($form_id, $form_values) {
 // drupal_set_message( print_r($_POST));

 //  $message = 'You have submitted the ' . $form_id . ' form which contains the following data:<pre>' . print_r($form_state['values'],true) . '</pre>';

  //drupal_set_message(t($message));
  //drupal_set_message(t($form_values['values']['txt_name']));
 // print_r($form_values['values']);
    $GET_TXT_FIELD_VALUE = $form_values['values']['txt_name'];
    $INSERT_QUERY = "INSERT INTO sample (test_name) VALUES ('$GET_TXT_FIELD_VALUE')";
    if (db_result(db_query("SELECT COUNT(*) FROM {sample} WHERE test_name = '%s';", $GET_TXT_FIELD_VALUE))) {
        // User doesn't exist
        drupal_set_message(t('ALREADY EXIST.....'));
     }else{
        db_query($INSERT_QUERY)or die('Execution Failed');
        if(db_affected_rows()==1){
            drupal_set_message(t('VALUE INSERTED SUCCESSFULLY'));
        }else{
            drupal_set_message(t('VALUE INSERTED FAILED'));
        }
    }    
}

If you want to pass an argument via the URL, use arg():

function custom1_default_form() {
  // Assuming the URL is http://example.com/admin/content/types:
  $arg1 = arg(1); // $arg1 = 'content'
  $arg2 = arg(2); // $arg2 = 'types'
  // ...
}

If you just want to pass an argument to the form via the drupal_get_form() call, just add the arguments as additional parameters to drupal_get_form():

$block['content'] = drupal_get_form('custom1_default_form', $arg1, $arg2);

// ...

function custom1_default_form($form_state, $arg1, $arg2) {
  // ...
}

I have found that in Drupal 6.20 you should add a dummy argument to the callback function definition:

$block['content'] = drupal_get_form('custom1_default_form', $arg1, $arg2);

// ...

function custom1_default_form($dummy, $arg1, $arg2) { // look at what gets stored in $dummy // ... }

avoid the using of arg() functions when possible:

Avoid use of this function where possible, as resulting code is hard to read. In menu callback functions, attempt to use named arguments. See the explanation in menu.inc for how to construct callbacks that take arguments. When attempting to use this function to load an element from the current path, e.g. loading the node on a node page, use menu_get_object() instead.